[463] | 1 | #include "Plane3.h"
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| 2 | #include "ViewCellBsp.h"
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| 3 | #include "Mesh.h"
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| 4 | #include "common.h"
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| 5 | #include "ViewCell.h"
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| 6 | #include "Environment.h"
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| 7 | #include "Polygon3.h"
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| 8 | #include "Ray.h"
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| 9 | #include "AxisAlignedBox3.h"
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[503] | 10 | #include "Triangle3.h"
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[544] | 11 | #include "Tetrahedron3.h"
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[587] | 12 | #include "ViewCellsManager.h"
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[463] | 13 | #include "Exporter.h"
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| 14 | #include "Plane3.h"
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[587] | 15 | #include <stack>
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[463] | 16 |
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[590] | 17 |
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| 18 |
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[463] | 19 | //-- static members
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| 20 |
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| 21 | int BspNode::sMailId = 1;
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| 22 |
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| 23 | /** Evaluates split plane classification with respect to the plane's
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| 24 | contribution for a minimum number splits in the tree.
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| 25 | */
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| 26 | const float BspTree::sLeastPolySplitsTable[] = {0, 0, 1, 0};
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| 27 | /** Evaluates split plane classification with respect to the plane's
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| 28 | contribution for a balanced tree.
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| 29 | */
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| 30 | const float BspTree::sBalancedPolysTable[] = {1, -1, 0, 0};
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| 31 |
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| 32 | /** Evaluates split plane classification with respect to the plane's
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| 33 | contribution for a minimum number of ray splits.
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| 34 | */
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| 35 | const float BspTree::sLeastRaySplitsTable[] = {0, 0, 1, 1, 0};
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| 36 | /** Evaluates split plane classification with respect to the plane's
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| 37 | contribution for balanced rays.
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| 38 | */
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| 39 | const float BspTree::sBalancedRaysTable[] = {1, -1, 0, 0, 0};
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| 40 |
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| 41 | int BspTree::sFrontId = 0;
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| 42 | int BspTree::sBackId = 0;
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| 43 | int BspTree::sFrontAndBackId = 0;
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| 44 |
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[489] | 45 |
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[463] | 46 | /****************************************************************/
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| 47 | /* class BspNode implementation */
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| 48 | /****************************************************************/
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| 49 |
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[489] | 50 |
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[463] | 51 | BspNode::BspNode():
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[610] | 52 | mParent(NULL), mTreeValid(true), mTimeStamp(0)
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[463] | 53 | {}
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| 54 |
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[650] | 55 |
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[463] | 56 | BspNode::BspNode(BspInterior *parent):
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[489] | 57 | mParent(parent), mTreeValid(true)
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[463] | 58 | {}
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| 59 |
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| 60 |
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| 61 | bool BspNode::IsRoot() const
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| 62 | {
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| 63 | return mParent == NULL;
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| 64 | }
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| 65 |
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[482] | 66 |
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[463] | 67 | BspInterior *BspNode::GetParent()
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| 68 | {
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| 69 | return mParent;
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| 70 | }
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| 71 |
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[482] | 72 |
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[463] | 73 | void BspNode::SetParent(BspInterior *parent)
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| 74 | {
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| 75 | mParent = parent;
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| 76 | }
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| 77 |
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[482] | 78 |
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| 79 | bool BspNode::IsSibling(BspNode *n) const
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| 80 | {
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| 81 | return ((this != n) && mParent &&
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| 82 | (mParent->GetFront() == n) || (mParent->GetBack() == n));
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| 83 | }
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| 84 |
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[487] | 85 |
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[482] | 86 | int BspNode::GetDepth() const
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| 87 | {
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| 88 | int depth = 0;
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| 89 | BspNode *p = mParent;
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| 90 |
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| 91 | while (p)
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| 92 | {
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| 93 | p = p->mParent;
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| 94 | ++ depth;
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| 95 | }
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| 96 |
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| 97 | return depth;
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| 98 | }
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| 99 |
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[487] | 100 |
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| 101 | bool BspNode::TreeValid() const
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| 102 | {
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| 103 | return mTreeValid;
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| 104 | }
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| 105 |
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| 106 |
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| 107 | void BspNode::SetTreeValid(const bool v)
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| 108 | {
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| 109 | mTreeValid = v;
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| 110 | }
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| 111 |
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| 112 |
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[463] | 113 | /****************************************************************/
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| 114 | /* class BspInterior implementation */
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| 115 | /****************************************************************/
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| 116 |
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| 117 |
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| 118 | BspInterior::BspInterior(const Plane3 &plane):
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| 119 | mPlane(plane), mFront(NULL), mBack(NULL)
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| 120 | {}
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| 121 |
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| 122 | BspInterior::~BspInterior()
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| 123 | {
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| 124 | DEL_PTR(mFront);
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| 125 | DEL_PTR(mBack);
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| 126 | }
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| 127 |
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| 128 | bool BspInterior::IsLeaf() const
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| 129 | {
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| 130 | return false;
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| 131 | }
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| 132 |
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| 133 | BspNode *BspInterior::GetBack()
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| 134 | {
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| 135 | return mBack;
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| 136 | }
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| 137 |
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| 138 | BspNode *BspInterior::GetFront()
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| 139 | {
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| 140 | return mFront;
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| 141 | }
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| 142 |
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| 143 | Plane3 BspInterior::GetPlane() const
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| 144 | {
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| 145 | return mPlane;
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| 146 | }
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| 147 |
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| 148 | void BspInterior::ReplaceChildLink(BspNode *oldChild, BspNode *newChild)
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| 149 | {
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| 150 | if (mBack == oldChild)
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| 151 | mBack = newChild;
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| 152 | else
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| 153 | mFront = newChild;
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| 154 | }
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| 155 |
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| 156 | void BspInterior::SetupChildLinks(BspNode *b, BspNode *f)
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| 157 | {
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| 158 | mBack = b;
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| 159 | mFront = f;
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| 160 | }
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| 161 |
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| 162 | /****************************************************************/
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| 163 | /* class BspLeaf implementation */
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| 164 | /****************************************************************/
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| 165 |
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| 166 |
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[485] | 167 | BspLeaf::BspLeaf(): mViewCell(NULL), mPvs(NULL)
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[463] | 168 | {
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| 169 | }
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| 170 |
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| 171 |
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[485] | 172 | BspLeaf::~BspLeaf()
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| 173 | {
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| 174 | DEL_PTR(mPvs);
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| 175 | }
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| 176 |
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| 177 |
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[590] | 178 | BspLeaf::BspLeaf(ViewCell *viewCell):
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[463] | 179 | mViewCell(viewCell)
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| 180 | {
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| 181 | }
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| 182 |
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| 183 |
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| 184 | BspLeaf::BspLeaf(BspInterior *parent):
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[485] | 185 | BspNode(parent), mViewCell(NULL), mPvs(NULL)
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[463] | 186 | {}
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| 187 |
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| 188 |
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| 189 |
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[590] | 190 | BspLeaf::BspLeaf(BspInterior *parent, ViewCell *viewCell):
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[485] | 191 | BspNode(parent), mViewCell(viewCell), mPvs(NULL)
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[463] | 192 | {
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| 193 | }
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| 194 |
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[590] | 195 | ViewCell *BspLeaf::GetViewCell() const
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[463] | 196 | {
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| 197 | return mViewCell;
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| 198 | }
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| 199 |
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[590] | 200 | void BspLeaf::SetViewCell(ViewCell *viewCell)
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[463] | 201 | {
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| 202 | mViewCell = viewCell;
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| 203 | }
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| 204 |
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[573] | 205 |
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[463] | 206 | bool BspLeaf::IsLeaf() const
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| 207 | {
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| 208 | return true;
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| 209 | }
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| 210 |
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| 211 |
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[580] | 212 | /*********************************************************************/
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| 213 | /* class BspTree implementation */
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| 214 | /*********************************************************************/
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[573] | 215 |
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[463] | 216 | BspTree::BspTree():
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| 217 | mRoot(NULL),
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[587] | 218 | mUseAreaForPvs(false),
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[610] | 219 | mGenerateViewCells(true),
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[650] | 220 | mTimeStamp(1)
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[463] | 221 | {
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| 222 | Randomize(); // initialise random generator for heuristics
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| 223 |
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[590] | 224 | mOutOfBoundsCell = GetOrCreateOutOfBoundsCell();
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[463] | 225 |
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| 226 | //-- termination criteria for autopartition
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| 227 | environment->GetIntValue("BspTree.Termination.maxDepth", mTermMaxDepth);
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| 228 | environment->GetIntValue("BspTree.Termination.minPvs", mTermMinPvs);
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| 229 | environment->GetIntValue("BspTree.Termination.minPolygons", mTermMinPolys);
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| 230 | environment->GetIntValue("BspTree.Termination.minRays", mTermMinRays);
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[587] | 231 | environment->GetFloatValue("BspTree.Termination.minProbability", mTermMinProbability);
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[463] | 232 | environment->GetFloatValue("BspTree.Termination.maxRayContribution", mTermMaxRayContribution);
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| 233 | environment->GetFloatValue("BspTree.Termination.minAccRayLenght", mTermMinAccRayLength);
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| 234 |
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| 235 | //-- factors for bsp tree split plane heuristics
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| 236 | environment->GetFloatValue("BspTree.Factor.verticalSplits", mVerticalSplitsFactor);
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| 237 | environment->GetFloatValue("BspTree.Factor.largestPolyArea", mLargestPolyAreaFactor);
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| 238 | environment->GetFloatValue("BspTree.Factor.blockedRays", mBlockedRaysFactor);
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| 239 | environment->GetFloatValue("BspTree.Factor.leastRaySplits", mLeastRaySplitsFactor);
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| 240 | environment->GetFloatValue("BspTree.Factor.balancedRays", mBalancedRaysFactor);
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| 241 | environment->GetFloatValue("BspTree.Factor.pvs", mPvsFactor);
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| 242 | environment->GetFloatValue("BspTree.Factor.leastSplits" , mLeastSplitsFactor);
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| 243 | environment->GetFloatValue("BspTree.Factor.balancedPolys", mBalancedPolysFactor);
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| 244 | environment->GetFloatValue("BspTree.Factor.balancedViewCells", mBalancedViewCellsFactor);
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| 245 | environment->GetFloatValue("BspTree.Termination.ct_div_ci", mCtDivCi);
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| 246 |
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| 247 | //-- termination criteria for axis aligned split
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[472] | 248 | environment->GetFloatValue("BspTree.Termination.AxisAligned.ct_div_ci", mAxisAlignedCtDivCi);
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| 249 | environment->GetFloatValue("BspTree.Termination.maxCostRatio", mMaxCostRatio);
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[463] | 250 | environment->GetIntValue("BspTree.Termination.AxisAligned.minPolys",
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| 251 | mTermMinPolysForAxisAligned);
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| 252 | environment->GetIntValue("BspTree.Termination.AxisAligned.minRays",
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| 253 | mTermMinRaysForAxisAligned);
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| 254 | environment->GetIntValue("BspTree.Termination.AxisAligned.minObjects",
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| 255 | mTermMinObjectsForAxisAligned);
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| 256 | //-- partition criteria
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| 257 | environment->GetIntValue("BspTree.maxPolyCandidates", mMaxPolyCandidates);
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| 258 | environment->GetIntValue("BspTree.maxRayCandidates", mMaxRayCandidates);
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| 259 | environment->GetIntValue("BspTree.splitPlaneStrategy", mSplitPlaneStrategy);
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| 260 | environment->GetFloatValue("BspTree.AxisAligned.splitBorder", mSplitBorder);
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| 261 | environment->GetIntValue("BspTree.maxTests", mMaxTests);
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[587] | 262 | environment->GetIntValue("BspTree.Termination.maxViewCells", mMaxViewCells);
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[463] | 263 |
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| 264 | environment->GetFloatValue("BspTree.Construction.epsilon", mEpsilon);
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[611] | 265 |
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[660] | 266 | char subdivisionStatsLog[100];
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| 267 | environment->GetStringValue("BspTree.subdivisionStats", subdivisionStatsLog);
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| 268 | mSubdivisionStats.open(subdivisionStatsLog);
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[611] | 269 |
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[463] | 270 | Debug << "BSP max depth: " << mTermMaxDepth << endl;
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| 271 | Debug << "BSP min PVS: " << mTermMinPvs << endl;
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[587] | 272 | Debug << "BSP min probability: " << mTermMinProbability << endl;
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[463] | 273 | Debug << "BSP max polys: " << mTermMinPolys << endl;
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| 274 | Debug << "BSP max rays: " << mTermMinRays << endl;
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| 275 | Debug << "BSP max polygon candidates: " << mMaxPolyCandidates << endl;
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| 276 | Debug << "BSP max plane candidates: " << mMaxRayCandidates << endl;
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| 277 |
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| 278 | Debug << "Split plane strategy: ";
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| 279 | if (mSplitPlaneStrategy & RANDOM_POLYGON)
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| 280 | Debug << "random polygon ";
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| 281 | if (mSplitPlaneStrategy & AXIS_ALIGNED)
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| 282 | Debug << "axis aligned ";
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| 283 | if (mSplitPlaneStrategy & LEAST_SPLITS)
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| 284 | Debug << "least splits ";
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| 285 | if (mSplitPlaneStrategy & BALANCED_POLYS)
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| 286 | Debug << "balanced polygons ";
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| 287 | if (mSplitPlaneStrategy & BALANCED_VIEW_CELLS)
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| 288 | Debug << "balanced view cells ";
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| 289 | if (mSplitPlaneStrategy & LARGEST_POLY_AREA)
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| 290 | Debug << "largest polygon area ";
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| 291 | if (mSplitPlaneStrategy & VERTICAL_AXIS)
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| 292 | Debug << "vertical axis ";
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| 293 | if (mSplitPlaneStrategy & BLOCKED_RAYS)
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| 294 | Debug << "blocked rays ";
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| 295 | if (mSplitPlaneStrategy & LEAST_RAY_SPLITS)
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| 296 | Debug << "least ray splits ";
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| 297 | if (mSplitPlaneStrategy & BALANCED_RAYS)
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| 298 | Debug << "balanced rays ";
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| 299 | if (mSplitPlaneStrategy & PVS)
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| 300 | Debug << "pvs";
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| 301 |
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| 302 | Debug << endl;
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| 303 | }
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| 304 |
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| 305 |
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| 306 | const BspTreeStatistics &BspTree::GetStatistics() const
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| 307 | {
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| 308 | return mStat;
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| 309 | }
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| 310 |
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| 311 |
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| 312 | int BspTree::SplitPolygons(const Plane3 &plane,
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| 313 | PolygonContainer &polys,
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| 314 | PolygonContainer &frontPolys,
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| 315 | PolygonContainer &backPolys,
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| 316 | PolygonContainer &coincident) const
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| 317 | {
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| 318 | int splits = 0;
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| 319 |
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| 320 | #ifdef _Debug
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| 321 | Debug << "splitting polygons of node " << this << " with plane " << mPlane << endl;
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| 322 | #endif
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[648] | 323 |
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[574] | 324 | PolygonContainer::const_iterator it, it_end = polys.end();
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| 325 |
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| 326 | for (it = polys.begin(); it != polys.end(); ++ it)
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[463] | 327 | {
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[574] | 328 | Polygon3 *poly = *it;
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| 329 |
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[491] | 330 | //-- classify polygon
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[463] | 331 | const int cf = poly->ClassifyPlane(plane, mEpsilon);
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| 332 |
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| 333 | switch (cf)
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| 334 | {
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| 335 | case Polygon3::COINCIDENT:
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| 336 | coincident.push_back(poly);
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| 337 | break;
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| 338 | case Polygon3::FRONT_SIDE:
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| 339 | frontPolys.push_back(poly);
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| 340 | break;
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| 341 | case Polygon3::BACK_SIDE:
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| 342 | backPolys.push_back(poly);
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| 343 | break;
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| 344 | case Polygon3::SPLIT:
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| 345 | {
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| 346 | Polygon3 *front_piece = new Polygon3(poly->mParent);
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| 347 | Polygon3 *back_piece = new Polygon3(poly->mParent);
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| 348 |
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| 349 | //-- split polygon into front and back part
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| 350 | poly->Split(plane,
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| 351 | *front_piece,
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| 352 | *back_piece,
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| 353 | mEpsilon);
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| 354 |
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| 355 | ++ splits; // increase number of splits
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| 356 |
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| 357 | //-- inherit rays from parent polygon for blocked ray criterium
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| 358 | poly->InheritRays(*front_piece, *back_piece);
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| 359 |
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| 360 | // check if polygons still valid
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| 361 | if (front_piece->Valid(mEpsilon))
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| 362 | frontPolys.push_back(front_piece);
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| 363 | else
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| 364 | DEL_PTR(front_piece);
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| 365 |
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| 366 | if (back_piece->Valid(mEpsilon))
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| 367 | backPolys.push_back(back_piece);
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| 368 | else
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| 369 | DEL_PTR(back_piece);
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| 370 |
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| 371 | #ifdef _DEBUG
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| 372 | Debug << "split " << *poly << endl << *front_piece << endl << *back_piece << endl;
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| 373 | #endif
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| 374 | DEL_PTR(poly);
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| 375 | }
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| 376 | break;
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| 377 | default:
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| 378 | Debug << "SHOULD NEVER COME HERE\n";
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| 379 | break;
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| 380 | }
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| 381 | }
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| 382 |
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| 383 | return splits;
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| 384 | }
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| 385 |
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| 386 |
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| 387 | void BspTreeStatistics::Print(ostream &app) const
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| 388 | {
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| 389 | app << "===== BspTree statistics ===============\n";
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| 390 |
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| 391 | app << setprecision(4);
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| 392 |
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| 393 | app << "#N_CTIME ( Construction time [s] )\n" << Time() << " \n";
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| 394 |
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| 395 | app << "#N_NODES ( Number of nodes )\n" << nodes << "\n";
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| 396 |
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| 397 | app << "#N_INTERIORS ( Number of interior nodes )\n" << Interior() << "\n";
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| 398 |
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| 399 | app << "#N_LEAVES ( Number of leaves )\n" << Leaves() << "\n";
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| 400 |
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[491] | 401 | app << "#N_POLYSPLITS ( Number of polygon splits )\n" << polySplits << "\n";
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[463] | 402 |
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[491] | 403 | app << "#AXIS_ALIGNED_SPLITS (number of axis aligned splits)\n" << splits[0] + splits[1] + splits[2] << endl;
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| 404 |
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[667] | 405 | app << "#N_SPLITS ( Number of splits in axes x y z)\n";
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[491] | 406 |
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| 407 | for (int i = 0; i < 3; ++ i)
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| 408 | app << splits[i] << " ";
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| 409 | app << endl;
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| 410 |
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[463] | 411 | app << "#N_PMAXDEPTHLEAVES ( Percentage of leaves at maximum depth )\n"
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| 412 | << maxDepthNodes * 100 / (double)Leaves() << endl;
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| 413 |
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| 414 | app << "#N_PMINPVSLEAVES ( Percentage of leaves with mininimal PVS )\n"
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| 415 | << minPvsNodes * 100 / (double)Leaves() << endl;
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| 416 |
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| 417 | app << "#N_PMINRAYSLEAVES ( Percentage of leaves with minimal number of rays)\n"
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[473] | 418 | << minRaysNodes * 100 / (double)Leaves() << endl;
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[463] | 419 |
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[473] | 420 | app << "#N_MAXCOSTNODES ( Percentage of leaves with terminated because of max cost ratio )\n"
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| 421 | << maxCostNodes * 100 / (double)Leaves() << endl;
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| 422 |
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[600] | 423 | app << "#N_PMINPROBABILITYLEAVES ( Percentage of leaves with mininum probability )\n"
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[547] | 424 | << minProbabilityNodes * 100 / (double)Leaves() << endl;
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[463] | 425 |
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| 426 | app << "#N_PMAXRAYCONTRIBLEAVES ( Percentage of leaves with maximal ray contribution )\n"
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| 427 | << maxRayContribNodes * 100 / (double)Leaves() << endl;
|
---|
| 428 |
|
---|
| 429 | app << "#N_PMAXDEPTH ( Maximal reached depth )\n" << maxDepth << endl;
|
---|
| 430 |
|
---|
| 431 | app << "#N_PMINDEPTH ( Minimal reached depth )\n" << minDepth << endl;
|
---|
| 432 |
|
---|
| 433 | app << "#AVGDEPTH ( average depth )\n" << AvgDepth() << endl;
|
---|
| 434 |
|
---|
[490] | 435 | app << "#N_INPUTPOLYGONS (number of input polygons )\n" << polys << endl;
|
---|
[463] | 436 |
|
---|
[490] | 437 | app << "#N_INVALIDLEAVES (number of invalid leaves )\n" << invalidLeaves << endl;
|
---|
| 438 |
|
---|
[503] | 439 | app << "#N_RAYS (number of rays / leaf)\n" << AvgRays() << endl;
|
---|
[463] | 440 | //app << "#N_PVS: " << pvs << endl;
|
---|
| 441 |
|
---|
| 442 | app << "#N_ROUTPUT_INPUT_POLYGONS ( ratio polygons after subdivision / input polygons )\n" <<
|
---|
[491] | 443 | (polys + polySplits) / (double)polys << endl;
|
---|
[463] | 444 |
|
---|
| 445 | app << "===== END OF BspTree statistics ==========\n";
|
---|
| 446 | }
|
---|
| 447 |
|
---|
| 448 |
|
---|
| 449 | BspTree::~BspTree()
|
---|
| 450 | {
|
---|
| 451 | DEL_PTR(mRoot);
|
---|
[485] | 452 |
|
---|
[590] | 453 | // TODO must be deleted if used!!
|
---|
| 454 | //if (mGenerateViewCells) DEL_PTR(mOutOfBoundsCell);
|
---|
[463] | 455 | }
|
---|
| 456 |
|
---|
[590] | 457 | BspViewCell *BspTree::GetOutOfBoundsCell()
|
---|
[463] | 458 | {
|
---|
[590] | 459 | return mOutOfBoundsCell;
|
---|
[463] | 460 | }
|
---|
| 461 |
|
---|
[590] | 462 |
|
---|
| 463 | BspNode *BspTree::GetRoot() const
|
---|
| 464 | {
|
---|
| 465 | return mRoot;
|
---|
| 466 | }
|
---|
| 467 |
|
---|
| 468 | BspViewCell *BspTree::GetOrCreateOutOfBoundsCell()
|
---|
| 469 | {
|
---|
| 470 | if (!mOutOfBoundsCell)
|
---|
| 471 | {
|
---|
| 472 | mOutOfBoundsCell = new BspViewCell();
|
---|
| 473 | mOutOfBoundsCell->SetId(-1);
|
---|
| 474 | mOutOfBoundsCell->SetValid(false);
|
---|
| 475 | }
|
---|
| 476 |
|
---|
| 477 | return mOutOfBoundsCell;
|
---|
| 478 | }
|
---|
| 479 |
|
---|
| 480 |
|
---|
[463] | 481 | void BspTree::InsertViewCell(ViewCell *viewCell)
|
---|
| 482 | {
|
---|
| 483 | PolygonContainer *polys = new PolygonContainer();
|
---|
| 484 |
|
---|
| 485 | // don't generate new view cell, insert this one
|
---|
| 486 | mGenerateViewCells = false;
|
---|
| 487 | // extract polygons that guide the split process
|
---|
| 488 | mStat.polys += AddMeshToPolygons(viewCell->GetMesh(), *polys, viewCell);
|
---|
| 489 | mBox.Include(viewCell->GetBox()); // add to BSP aabb
|
---|
| 490 |
|
---|
| 491 | InsertPolygons(polys);
|
---|
| 492 | }
|
---|
| 493 |
|
---|
[590] | 494 |
|
---|
[463] | 495 | void BspTree::InsertPolygons(PolygonContainer *polys)
|
---|
| 496 | {
|
---|
[472] | 497 | BspTraversalStack tStack;
|
---|
[463] | 498 |
|
---|
| 499 | // traverse existing tree or create new tree
|
---|
| 500 | if (!mRoot)
|
---|
| 501 | mRoot = new BspLeaf();
|
---|
| 502 |
|
---|
[473] | 503 | tStack.push(BspTraversalData(mRoot,
|
---|
| 504 | polys,
|
---|
| 505 | 0,
|
---|
[590] | 506 | mOutOfBoundsCell,
|
---|
[473] | 507 | new BoundedRayContainer(),
|
---|
| 508 | 0,
|
---|
[587] | 509 | mUseAreaForPvs ? mBox.SurfaceArea() : mBox.GetVolume(),
|
---|
[473] | 510 | new BspNodeGeometry()));
|
---|
[463] | 511 |
|
---|
| 512 | while (!tStack.empty())
|
---|
| 513 | {
|
---|
| 514 | // filter polygons donw the tree
|
---|
| 515 | BspTraversalData tData = tStack.top();
|
---|
| 516 | tStack.pop();
|
---|
| 517 |
|
---|
| 518 | if (!tData.mNode->IsLeaf())
|
---|
| 519 | {
|
---|
| 520 | BspInterior *interior = dynamic_cast<BspInterior *>(tData.mNode);
|
---|
| 521 |
|
---|
| 522 | //-- filter view cell polygons down the tree until a leaf is reached
|
---|
| 523 | if (!tData.mPolygons->empty())
|
---|
| 524 | {
|
---|
| 525 | PolygonContainer *frontPolys = new PolygonContainer();
|
---|
| 526 | PolygonContainer *backPolys = new PolygonContainer();
|
---|
| 527 | PolygonContainer coincident;
|
---|
| 528 |
|
---|
| 529 | int splits = 0;
|
---|
| 530 |
|
---|
| 531 | // split viewcell polygons with respect to split plane
|
---|
| 532 | splits += SplitPolygons(interior->GetPlane(),
|
---|
| 533 | *tData.mPolygons,
|
---|
| 534 | *frontPolys,
|
---|
| 535 | *backPolys,
|
---|
| 536 | coincident);
|
---|
| 537 |
|
---|
| 538 | // extract view cells associated with the split polygons
|
---|
[590] | 539 | ViewCell *frontViewCell = GetOrCreateOutOfBoundsCell();
|
---|
| 540 | ViewCell *backViewCell = GetOrCreateOutOfBoundsCell();
|
---|
[463] | 541 |
|
---|
| 542 | BspTraversalData frontData(interior->GetFront(),
|
---|
| 543 | frontPolys,
|
---|
| 544 | tData.mDepth + 1,
|
---|
[590] | 545 | mOutOfBoundsCell,
|
---|
[463] | 546 | tData.mRays,
|
---|
| 547 | tData.mPvs,
|
---|
[587] | 548 | mUseAreaForPvs ? mBox.SurfaceArea() : mBox.GetVolume(),
|
---|
[463] | 549 | new BspNodeGeometry());
|
---|
| 550 |
|
---|
| 551 | BspTraversalData backData(interior->GetBack(),
|
---|
| 552 | backPolys,
|
---|
| 553 | tData.mDepth + 1,
|
---|
[590] | 554 | mOutOfBoundsCell,
|
---|
[463] | 555 | tData.mRays,
|
---|
| 556 | tData.mPvs,
|
---|
[587] | 557 | mUseAreaForPvs ? mBox.SurfaceArea() : mBox.GetVolume(),
|
---|
[463] | 558 | new BspNodeGeometry());
|
---|
| 559 |
|
---|
| 560 | if (!mGenerateViewCells)
|
---|
| 561 | {
|
---|
| 562 | ExtractViewCells(frontData,
|
---|
| 563 | backData,
|
---|
| 564 | coincident,
|
---|
| 565 | interior->mPlane);
|
---|
| 566 | }
|
---|
| 567 |
|
---|
| 568 | // don't need coincident polygons anymore
|
---|
| 569 | CLEAR_CONTAINER(coincident);
|
---|
| 570 |
|
---|
[491] | 571 | mStat.polySplits += splits;
|
---|
[463] | 572 |
|
---|
| 573 | // push the children on the stack
|
---|
| 574 | tStack.push(frontData);
|
---|
| 575 | tStack.push(backData);
|
---|
| 576 | }
|
---|
| 577 |
|
---|
| 578 | // cleanup
|
---|
| 579 | DEL_PTR(tData.mPolygons);
|
---|
| 580 | DEL_PTR(tData.mRays);
|
---|
| 581 | }
|
---|
| 582 | else
|
---|
| 583 | {
|
---|
| 584 | // reached leaf => subdivide current viewcell
|
---|
| 585 | BspNode *subRoot = Subdivide(tStack, tData);
|
---|
| 586 | }
|
---|
| 587 | }
|
---|
| 588 | }
|
---|
| 589 |
|
---|
| 590 | int BspTree::AddMeshToPolygons(Mesh *mesh,
|
---|
| 591 | PolygonContainer &polys,
|
---|
| 592 | MeshInstance *parent)
|
---|
| 593 | {
|
---|
| 594 | FaceContainer::const_iterator fi;
|
---|
| 595 |
|
---|
| 596 | // copy the face data to polygons
|
---|
| 597 | for (fi = mesh->mFaces.begin(); fi != mesh->mFaces.end(); ++ fi)
|
---|
| 598 | {
|
---|
| 599 | Polygon3 *poly = new Polygon3((*fi), mesh);
|
---|
| 600 |
|
---|
| 601 | if (poly->Valid(mEpsilon))
|
---|
| 602 | {
|
---|
| 603 | poly->mParent = parent; // set parent intersectable
|
---|
| 604 | polys.push_back(poly);
|
---|
| 605 | }
|
---|
| 606 | else
|
---|
| 607 | DEL_PTR(poly);
|
---|
| 608 | }
|
---|
| 609 | return (int)mesh->mFaces.size();
|
---|
| 610 | }
|
---|
| 611 |
|
---|
[587] | 612 |
|
---|
[463] | 613 | int BspTree::AddToPolygonSoup(const ViewCellContainer &viewCells,
|
---|
| 614 | PolygonContainer &polys,
|
---|
| 615 | int maxObjects)
|
---|
| 616 | {
|
---|
| 617 | int limit = (maxObjects > 0) ?
|
---|
| 618 | Min((int)viewCells.size(), maxObjects) : (int)viewCells.size();
|
---|
| 619 |
|
---|
| 620 | int polysSize = 0;
|
---|
| 621 |
|
---|
| 622 | for (int i = 0; i < limit; ++ i)
|
---|
| 623 | {
|
---|
| 624 | if (viewCells[i]->GetMesh()) // copy the mesh data to polygons
|
---|
| 625 | {
|
---|
| 626 | mBox.Include(viewCells[i]->GetBox()); // add to BSP tree aabb
|
---|
| 627 | polysSize += AddMeshToPolygons(viewCells[i]->GetMesh(), polys, viewCells[i]);
|
---|
| 628 | }
|
---|
| 629 | }
|
---|
| 630 |
|
---|
| 631 | return polysSize;
|
---|
| 632 | }
|
---|
| 633 |
|
---|
[587] | 634 |
|
---|
| 635 | int BspTree::AddToPolygonSoup(const ObjectContainer &objects,
|
---|
| 636 | PolygonContainer &polys,
|
---|
| 637 | int maxObjects,
|
---|
| 638 | bool addToBbox)
|
---|
[463] | 639 | {
|
---|
[587] | 640 | int limit = (maxObjects > 0) ?
|
---|
| 641 | Min((int)objects.size(), maxObjects) : (int)objects.size();
|
---|
[463] | 642 |
|
---|
| 643 | for (int i = 0; i < limit; ++i)
|
---|
| 644 | {
|
---|
| 645 | Intersectable *object = objects[i];//*it;
|
---|
| 646 | Mesh *mesh = NULL;
|
---|
| 647 |
|
---|
| 648 | switch (object->Type()) // extract the meshes
|
---|
| 649 | {
|
---|
| 650 | case Intersectable::MESH_INSTANCE:
|
---|
| 651 | mesh = dynamic_cast<MeshInstance *>(object)->GetMesh();
|
---|
| 652 | break;
|
---|
| 653 | case Intersectable::VIEW_CELL:
|
---|
| 654 | mesh = dynamic_cast<ViewCell *>(object)->GetMesh();
|
---|
| 655 | break;
|
---|
| 656 | // TODO: handle transformed mesh instances
|
---|
| 657 | default:
|
---|
| 658 | Debug << "intersectable type not supported" << endl;
|
---|
| 659 | break;
|
---|
| 660 | }
|
---|
| 661 |
|
---|
| 662 | if (mesh) // copy the mesh data to polygons
|
---|
| 663 | {
|
---|
[587] | 664 | if (addToBbox)
|
---|
| 665 | {
|
---|
| 666 | mBox.Include(object->GetBox()); // add to BSP tree aabb
|
---|
| 667 | }
|
---|
| 668 |
|
---|
[590] | 669 | AddMeshToPolygons(mesh, polys, mOutOfBoundsCell);
|
---|
[463] | 670 | }
|
---|
| 671 | }
|
---|
| 672 |
|
---|
| 673 | return (int)polys.size();
|
---|
| 674 | }
|
---|
| 675 |
|
---|
[587] | 676 |
|
---|
[463] | 677 | void BspTree::Construct(const ViewCellContainer &viewCells)
|
---|
| 678 | {
|
---|
| 679 | mStat.nodes = 1;
|
---|
| 680 | mBox.Initialize(); // initialise bsp tree bounding box
|
---|
| 681 |
|
---|
| 682 | // copy view cell meshes into one big polygon soup
|
---|
| 683 | PolygonContainer *polys = new PolygonContainer();
|
---|
| 684 | mStat.polys = AddToPolygonSoup(viewCells, *polys);
|
---|
| 685 |
|
---|
| 686 | // view cells are given
|
---|
| 687 | mGenerateViewCells = false;
|
---|
| 688 | // construct tree from the view cell polygons
|
---|
| 689 | Construct(polys, new BoundedRayContainer());
|
---|
| 690 | }
|
---|
| 691 |
|
---|
| 692 |
|
---|
| 693 | void BspTree::Construct(const ObjectContainer &objects)
|
---|
| 694 | {
|
---|
| 695 | mStat.nodes = 1;
|
---|
| 696 | mBox.Initialize(); // initialise bsp tree bounding box
|
---|
| 697 |
|
---|
| 698 | PolygonContainer *polys = new PolygonContainer();
|
---|
| 699 |
|
---|
| 700 | mGenerateViewCells = true;
|
---|
| 701 | // copy mesh instance polygons into one big polygon soup
|
---|
| 702 | mStat.polys = AddToPolygonSoup(objects, *polys);
|
---|
| 703 |
|
---|
| 704 | // construct tree from polygon soup
|
---|
| 705 | Construct(polys, new BoundedRayContainer());
|
---|
| 706 | }
|
---|
| 707 |
|
---|
[587] | 708 |
|
---|
[647] | 709 | void BspTree::PreprocessPolygons(PolygonContainer &polys)
|
---|
| 710 | {
|
---|
| 711 | // preprocess: throw out polygons coincident to the view space box (not needed)
|
---|
| 712 | PolygonContainer boxPolys;
|
---|
[648] | 713 | mBox.ExtractPolys(boxPolys);
|
---|
[647] | 714 | vector<Plane3> boxPlanes;
|
---|
| 715 |
|
---|
[648] | 716 | PolygonContainer::iterator pit, pit_end = boxPolys.end();
|
---|
| 717 |
|
---|
| 718 | // extract planes of box
|
---|
| 719 | // TODO: can be done more elegantly than first extracting polygons
|
---|
| 720 | // and take their planes
|
---|
| 721 | for (pit = boxPolys.begin(); pit != pit_end; ++ pit)
|
---|
[647] | 722 | {
|
---|
[648] | 723 | boxPlanes.push_back((*pit)->GetSupportingPlane());
|
---|
| 724 | }
|
---|
| 725 |
|
---|
| 726 | pit_end = polys.end();
|
---|
| 727 |
|
---|
| 728 | for (pit = polys.begin(); pit != pit_end; ++ pit)
|
---|
| 729 | {
|
---|
| 730 | vector<Plane3>::const_iterator bit, bit_end = boxPlanes.end();
|
---|
[647] | 731 |
|
---|
[648] | 732 | for (bit = boxPlanes.begin(); (bit != bit_end) && (*pit); ++ bit)
|
---|
| 733 | {
|
---|
| 734 | const int cf = (*pit)->ClassifyPlane(*bit, mEpsilon);
|
---|
| 735 |
|
---|
| 736 | if (cf == Polygon3::COINCIDENT)
|
---|
| 737 | {
|
---|
| 738 | DEL_PTR(*pit);
|
---|
| 739 | //Debug << "coincident!!" << endl;
|
---|
| 740 | }
|
---|
| 741 | }
|
---|
[647] | 742 | }
|
---|
[648] | 743 |
|
---|
| 744 | // remove deleted entries
|
---|
| 745 | for (int i = 0; i < (int)polys.size(); ++ i)
|
---|
| 746 | {
|
---|
| 747 | while (!polys[i] && (i < (int)polys.size()))
|
---|
| 748 | {
|
---|
| 749 | swap(polys[i], polys.back());
|
---|
| 750 | polys.pop_back();
|
---|
| 751 | }
|
---|
| 752 | }
|
---|
[647] | 753 | }
|
---|
| 754 |
|
---|
[648] | 755 |
|
---|
| 756 |
|
---|
[587] | 757 | void BspTree::Construct(const RayContainer &sampleRays,
|
---|
| 758 | AxisAlignedBox3 *forcedBoundingBox)
|
---|
[463] | 759 | {
|
---|
| 760 | mStat.nodes = 1;
|
---|
| 761 | mBox.Initialize(); // initialise BSP tree bounding box
|
---|
| 762 |
|
---|
[587] | 763 | if (forcedBoundingBox)
|
---|
| 764 | mBox = *forcedBoundingBox;
|
---|
| 765 |
|
---|
[463] | 766 | PolygonContainer *polys = new PolygonContainer();
|
---|
| 767 | BoundedRayContainer *rays = new BoundedRayContainer();
|
---|
| 768 |
|
---|
| 769 | RayContainer::const_iterator rit, rit_end = sampleRays.end();
|
---|
| 770 |
|
---|
| 771 | // generate view cells
|
---|
| 772 | mGenerateViewCells = true;
|
---|
| 773 |
|
---|
| 774 | long startTime = GetTime();
|
---|
| 775 |
|
---|
| 776 | Debug << "**** Extracting polygons from rays ****\n";
|
---|
| 777 |
|
---|
| 778 | std::map<Face *, Polygon3 *> facePolyMap;
|
---|
| 779 |
|
---|
| 780 | //-- extract polygons intersected by the rays
|
---|
| 781 | for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
|
---|
| 782 | {
|
---|
| 783 | Ray *ray = *rit;
|
---|
| 784 |
|
---|
| 785 | // get ray-face intersection. Store polygon representing the rays together
|
---|
| 786 | // with rays intersecting the face.
|
---|
| 787 | if (!ray->intersections.empty())
|
---|
| 788 | {
|
---|
| 789 | MeshInstance *obj = dynamic_cast<MeshInstance *>(ray->intersections[0].mObject);
|
---|
| 790 | Face *face = obj->GetMesh()->mFaces[ray->intersections[0].mFace];
|
---|
| 791 |
|
---|
| 792 | std::map<Face *, Polygon3 *>::iterator it = facePolyMap.find(face);
|
---|
| 793 |
|
---|
| 794 | if (it != facePolyMap.end())
|
---|
| 795 | {
|
---|
| 796 | //store rays if needed for heuristics
|
---|
| 797 | if (mSplitPlaneStrategy & BLOCKED_RAYS)
|
---|
| 798 | (*it).second->mPiercingRays.push_back(ray);
|
---|
| 799 | }
|
---|
| 800 | else
|
---|
| 801 | { //store rays if needed for heuristics
|
---|
| 802 | Polygon3 *poly = new Polygon3(face, obj->GetMesh());
|
---|
| 803 | poly->mParent = obj;
|
---|
| 804 | polys->push_back(poly);
|
---|
| 805 |
|
---|
| 806 | if (mSplitPlaneStrategy & BLOCKED_RAYS)
|
---|
| 807 | poly->mPiercingRays.push_back(ray);
|
---|
| 808 |
|
---|
| 809 | facePolyMap[face] = poly;
|
---|
| 810 | }
|
---|
| 811 | }
|
---|
| 812 | }
|
---|
| 813 |
|
---|
| 814 | facePolyMap.clear();
|
---|
| 815 |
|
---|
| 816 | // compute bounding box
|
---|
[587] | 817 | if (!forcedBoundingBox)
|
---|
| 818 | Polygon3::IncludeInBox(*polys, mBox);
|
---|
[463] | 819 |
|
---|
| 820 | //-- store rays
|
---|
| 821 | for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
|
---|
| 822 | {
|
---|
| 823 | Ray *ray = *rit;
|
---|
| 824 | ray->SetId(-1); // reset id
|
---|
| 825 |
|
---|
| 826 | float minT, maxT;
|
---|
| 827 | if (mBox.GetRaySegment(*ray, minT, maxT))
|
---|
| 828 | rays->push_back(new BoundedRay(ray, minT, maxT));
|
---|
| 829 | }
|
---|
| 830 |
|
---|
[648] | 831 | // throw out bad polygons
|
---|
| 832 | PreprocessPolygons(*polys);
|
---|
[647] | 833 |
|
---|
[463] | 834 | mStat.polys = (int)polys->size();
|
---|
| 835 |
|
---|
| 836 | Debug << "**** Finished polygon extraction ****" << endl;
|
---|
| 837 | Debug << (int)polys->size() << " polys extracted from " << (int)sampleRays.size() << " rays" << endl;
|
---|
| 838 | Debug << "extraction time: " << TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
|
---|
| 839 |
|
---|
| 840 | Construct(polys, rays);
|
---|
| 841 | }
|
---|
| 842 |
|
---|
[587] | 843 |
|
---|
| 844 | void BspTree::Construct(const ObjectContainer &objects,
|
---|
| 845 | const RayContainer &sampleRays,
|
---|
| 846 | AxisAlignedBox3 *forcedBoundingBox)
|
---|
[463] | 847 | {
|
---|
| 848 | mStat.nodes = 1;
|
---|
| 849 | mBox.Initialize(); // initialise BSP tree bounding box
|
---|
| 850 |
|
---|
[587] | 851 | if (forcedBoundingBox)
|
---|
| 852 | mBox = *forcedBoundingBox;
|
---|
| 853 |
|
---|
[463] | 854 | BoundedRayContainer *rays = new BoundedRayContainer();
|
---|
| 855 | PolygonContainer *polys = new PolygonContainer();
|
---|
| 856 |
|
---|
| 857 | mGenerateViewCells = true;
|
---|
| 858 |
|
---|
| 859 | // copy mesh instance polygons into one big polygon soup
|
---|
[587] | 860 | mStat.polys = AddToPolygonSoup(objects, *polys, 0, !forcedBoundingBox);
|
---|
[463] | 861 |
|
---|
[587] | 862 |
|
---|
[463] | 863 | RayContainer::const_iterator rit, rit_end = sampleRays.end();
|
---|
| 864 |
|
---|
| 865 | //-- store rays
|
---|
| 866 | for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
|
---|
| 867 | {
|
---|
| 868 | Ray *ray = *rit;
|
---|
| 869 | ray->SetId(-1); // reset id
|
---|
| 870 |
|
---|
| 871 | float minT, maxT;
|
---|
| 872 | if (mBox.GetRaySegment(*ray, minT, maxT))
|
---|
| 873 | rays->push_back(new BoundedRay(ray, minT, maxT));
|
---|
| 874 | }
|
---|
| 875 |
|
---|
[648] | 876 | PreprocessPolygons(*polys);
|
---|
[463] | 877 | Debug << "tree has " << (int)polys->size() << " polys, " << (int)sampleRays.size() << " rays" << endl;
|
---|
| 878 | Construct(polys, rays);
|
---|
| 879 | }
|
---|
| 880 |
|
---|
[587] | 881 |
|
---|
[463] | 882 | void BspTree::Construct(PolygonContainer *polys, BoundedRayContainer *rays)
|
---|
| 883 | {
|
---|
[472] | 884 | BspTraversalStack tStack;
|
---|
[463] | 885 |
|
---|
| 886 | mRoot = new BspLeaf();
|
---|
| 887 |
|
---|
| 888 | // constrruct root node geometry
|
---|
[503] | 889 | BspNodeGeometry *geom = new BspNodeGeometry();
|
---|
| 890 | ConstructGeometry(mRoot, *geom);
|
---|
[463] | 891 |
|
---|
[587] | 892 | BspTraversalData tData(mRoot,
|
---|
| 893 | polys,
|
---|
| 894 | 0,
|
---|
[590] | 895 | GetOrCreateOutOfBoundsCell(),
|
---|
[587] | 896 | rays,
|
---|
| 897 | ComputePvsSize(*rays),
|
---|
| 898 | mUseAreaForPvs ? geom->GetArea() : geom->GetVolume(),
|
---|
| 899 | geom);
|
---|
[463] | 900 |
|
---|
[611] | 901 | mTotalCost = tData.mPvs * tData.mProbability / mBox.GetVolume();
|
---|
| 902 | mTotalPvsSize = tData.mPvs;
|
---|
| 903 |
|
---|
| 904 | mSubdivisionStats
|
---|
| 905 | << "#ViewCells\n1\n" << endl
|
---|
| 906 | << "#RenderCostDecrease\n0\n" << endl
|
---|
| 907 | << "#TotalRenderCost\n" << mTotalCost << endl
|
---|
| 908 | << "#AvgRenderCost\n" << mTotalPvsSize << endl;
|
---|
| 909 |
|
---|
[463] | 910 | tStack.push(tData);
|
---|
| 911 |
|
---|
[611] | 912 | // used for intermediate time measurements and progress
|
---|
| 913 | long interTime = GetTime();
|
---|
| 914 | int nleaves = 500;
|
---|
| 915 |
|
---|
[463] | 916 | mStat.Start();
|
---|
[667] | 917 | cout << "Constructing bsp tree ...\n";
|
---|
[463] | 918 | long startTime = GetTime();
|
---|
| 919 | while (!tStack.empty())
|
---|
| 920 | {
|
---|
| 921 | tData = tStack.top();
|
---|
| 922 |
|
---|
| 923 | tStack.pop();
|
---|
| 924 |
|
---|
| 925 | // subdivide leaf node
|
---|
| 926 | BspNode *r = Subdivide(tStack, tData);
|
---|
| 927 |
|
---|
| 928 | if (r == mRoot)
|
---|
[587] | 929 | Debug << "BSP tree construction time spent at root: "
|
---|
| 930 | << TimeDiff(startTime, GetTime())*1e-3 << " secs" << endl;
|
---|
[611] | 931 |
|
---|
| 932 | if (mStat.Leaves() >= nleaves)
|
---|
| 933 | {
|
---|
| 934 | nleaves += 500;
|
---|
| 935 |
|
---|
| 936 | cout << "leaves=" << mStat.Leaves() << endl;
|
---|
| 937 | Debug << "needed "
|
---|
| 938 | << TimeDiff(interTime, GetTime())*1e-3
|
---|
| 939 | << " secs to create 500 leaves" << endl;
|
---|
| 940 | interTime = GetTime();
|
---|
| 941 | }
|
---|
[463] | 942 | }
|
---|
| 943 |
|
---|
| 944 | cout << "finished\n";
|
---|
| 945 |
|
---|
| 946 | mStat.Stop();
|
---|
| 947 | }
|
---|
| 948 |
|
---|
[600] | 949 |
|
---|
[463] | 950 | bool BspTree::TerminationCriteriaMet(const BspTraversalData &data) const
|
---|
| 951 | {
|
---|
| 952 | return
|
---|
| 953 | (((int)data.mPolygons->size() <= mTermMinPolys) ||
|
---|
| 954 | ((int)data.mRays->size() <= mTermMinRays) ||
|
---|
| 955 | (data.mPvs <= mTermMinPvs) ||
|
---|
[587] | 956 | (data.mProbability <= mTermMinProbability) ||
|
---|
[463] | 957 | (data.mDepth >= mTermMaxDepth) ||
|
---|
[587] | 958 | (mStat.Leaves() >= mMaxViewCells) ||
|
---|
| 959 | (data.GetAvgRayContribution() > mTermMaxRayContribution));
|
---|
[463] | 960 | }
|
---|
| 961 |
|
---|
[600] | 962 |
|
---|
[463] | 963 | BspNode *BspTree::Subdivide(BspTraversalStack &tStack, BspTraversalData &tData)
|
---|
| 964 | {
|
---|
| 965 | //-- terminate traversal
|
---|
| 966 | if (TerminationCriteriaMet(tData))
|
---|
| 967 | {
|
---|
| 968 | BspLeaf *leaf = dynamic_cast<BspLeaf *>(tData.mNode);
|
---|
| 969 |
|
---|
| 970 | BspViewCell *viewCell;
|
---|
| 971 |
|
---|
| 972 | // generate new view cell for each leaf
|
---|
| 973 | if (mGenerateViewCells)
|
---|
| 974 | viewCell = new BspViewCell();
|
---|
| 975 | else
|
---|
| 976 | // add view cell to leaf
|
---|
| 977 | viewCell = dynamic_cast<BspViewCell *>(tData.mViewCell);
|
---|
[485] | 978 |
|
---|
[463] | 979 | leaf->SetViewCell(viewCell);
|
---|
[580] | 980 | viewCell->mLeaf = leaf;
|
---|
[463] | 981 |
|
---|
[676] | 982 | //float probability = max(0.0f, tData.mProbability);
|
---|
| 983 | float probability = tData.mProbability;
|
---|
[675] | 984 |
|
---|
[587] | 985 | if (mUseAreaForPvs)
|
---|
[675] | 986 | viewCell->SetArea(probability);
|
---|
[587] | 987 | else
|
---|
[675] | 988 | viewCell->SetVolume(probability);
|
---|
| 989 |
|
---|
[463] | 990 | //-- add pvs
|
---|
[590] | 991 | if (viewCell != mOutOfBoundsCell)
|
---|
[463] | 992 | {
|
---|
| 993 | int conSamp = 0, sampCon = 0;
|
---|
| 994 | AddToPvs(leaf, *tData.mRays, conSamp, sampCon);
|
---|
| 995 |
|
---|
| 996 | mStat.contributingSamples += conSamp;
|
---|
| 997 | mStat.sampleContributions += sampCon;
|
---|
| 998 | }
|
---|
| 999 |
|
---|
| 1000 | EvaluateLeafStats(tData);
|
---|
| 1001 |
|
---|
| 1002 | //-- clean up
|
---|
| 1003 |
|
---|
| 1004 | // discard polygons
|
---|
| 1005 | CLEAR_CONTAINER(*tData.mPolygons);
|
---|
| 1006 | // discard rays
|
---|
| 1007 | CLEAR_CONTAINER(*tData.mRays);
|
---|
| 1008 |
|
---|
| 1009 | DEL_PTR(tData.mPolygons);
|
---|
| 1010 | DEL_PTR(tData.mRays);
|
---|
| 1011 | DEL_PTR(tData.mGeometry);
|
---|
| 1012 |
|
---|
| 1013 | return leaf;
|
---|
| 1014 | }
|
---|
| 1015 |
|
---|
| 1016 | //-- continue subdivision
|
---|
| 1017 | PolygonContainer coincident;
|
---|
| 1018 |
|
---|
[590] | 1019 | BspTraversalData tFrontData(NULL, new PolygonContainer(), tData.mDepth + 1, mOutOfBoundsCell,
|
---|
[463] | 1020 | new BoundedRayContainer(), 0, 0, new BspNodeGeometry());
|
---|
[590] | 1021 | BspTraversalData tBackData(NULL, new PolygonContainer(), tData.mDepth + 1, mOutOfBoundsCell,
|
---|
[463] | 1022 | new BoundedRayContainer(), 0, 0, new BspNodeGeometry());
|
---|
| 1023 |
|
---|
[611] | 1024 |
|
---|
[463] | 1025 | // create new interior node and two leaf nodes
|
---|
| 1026 | BspInterior *interior =
|
---|
| 1027 | SubdivideNode(tData, tFrontData, tBackData, coincident);
|
---|
| 1028 |
|
---|
| 1029 |
|
---|
[611] | 1030 | if (1)
|
---|
| 1031 | {
|
---|
[645] | 1032 | int pvsData = tData.mPvs;
|
---|
[648] | 1033 |
|
---|
[645] | 1034 | float cData = (float)pvsData * tData.mProbability;
|
---|
[611] | 1035 | float cFront = (float)tFrontData.mPvs * tFrontData.mProbability;
|
---|
| 1036 | float cBack = (float)tBackData.mPvs * tBackData.mProbability;
|
---|
| 1037 |
|
---|
[645] | 1038 | float costDecr = (cFront + cBack - cData) / mBox.GetVolume();
|
---|
[611] | 1039 |
|
---|
| 1040 | mTotalCost += costDecr;
|
---|
| 1041 | mTotalPvsSize += tFrontData.mPvs + tBackData.mPvs - pvsData;
|
---|
| 1042 |
|
---|
| 1043 | mSubdivisionStats
|
---|
| 1044 | << "#ViewCells\n" << mStat.Leaves() << endl
|
---|
| 1045 | << "#RenderCostDecrease\n" << -costDecr << endl
|
---|
| 1046 | << "#TotalRenderCost\n" << mTotalCost << endl
|
---|
| 1047 | << "#AvgRenderCost\n" << mTotalPvsSize / mStat.Leaves() << endl;
|
---|
| 1048 | }
|
---|
| 1049 |
|
---|
[463] | 1050 | // extract view cells from coincident polygons according to plane normal
|
---|
| 1051 | // only if front or back polygons are empty
|
---|
| 1052 | if (!mGenerateViewCells)
|
---|
| 1053 | {
|
---|
| 1054 | ExtractViewCells(tFrontData,
|
---|
| 1055 | tBackData,
|
---|
| 1056 | coincident,
|
---|
| 1057 | interior->mPlane);
|
---|
| 1058 | }
|
---|
| 1059 |
|
---|
| 1060 | // don't need coincident polygons anymory
|
---|
| 1061 | CLEAR_CONTAINER(coincident);
|
---|
| 1062 |
|
---|
| 1063 | // push the children on the stack
|
---|
| 1064 | tStack.push(tFrontData);
|
---|
| 1065 | tStack.push(tBackData);
|
---|
| 1066 |
|
---|
| 1067 | // cleanup
|
---|
| 1068 | DEL_PTR(tData.mNode);
|
---|
| 1069 |
|
---|
| 1070 | DEL_PTR(tData.mPolygons);
|
---|
| 1071 | DEL_PTR(tData.mRays);
|
---|
| 1072 | DEL_PTR(tData.mGeometry);
|
---|
| 1073 |
|
---|
| 1074 | return interior;
|
---|
| 1075 | }
|
---|
| 1076 |
|
---|
[645] | 1077 |
|
---|
[463] | 1078 | void BspTree::ExtractViewCells(BspTraversalData &frontData,
|
---|
| 1079 | BspTraversalData &backData,
|
---|
| 1080 | const PolygonContainer &coincident,
|
---|
| 1081 | const Plane3 &splitPlane) const
|
---|
| 1082 | {
|
---|
| 1083 | // if not empty, tree is further subdivided => don't have to find view cell
|
---|
| 1084 | bool foundFront = !frontData.mPolygons->empty();
|
---|
| 1085 | bool foundBack = !frontData.mPolygons->empty();
|
---|
| 1086 |
|
---|
| 1087 | PolygonContainer::const_iterator it =
|
---|
| 1088 | coincident.begin(), it_end = coincident.end();
|
---|
| 1089 |
|
---|
| 1090 | //-- find first view cells in front and back leafs
|
---|
| 1091 | for (; !(foundFront && foundBack) && (it != it_end); ++ it)
|
---|
| 1092 | {
|
---|
| 1093 | if (DotProd((*it)->GetNormal(), splitPlane.mNormal) > 0)
|
---|
| 1094 | {
|
---|
| 1095 | backData.mViewCell = dynamic_cast<ViewCell *>((*it)->mParent);
|
---|
| 1096 | foundBack = true;
|
---|
| 1097 | }
|
---|
| 1098 | else
|
---|
| 1099 | {
|
---|
| 1100 | frontData.mViewCell = dynamic_cast<ViewCell *>((*it)->mParent);
|
---|
| 1101 | foundFront = true;
|
---|
| 1102 | }
|
---|
| 1103 | }
|
---|
| 1104 | }
|
---|
| 1105 |
|
---|
[645] | 1106 |
|
---|
[463] | 1107 | BspInterior *BspTree::SubdivideNode(BspTraversalData &tData,
|
---|
| 1108 | BspTraversalData &frontData,
|
---|
| 1109 | BspTraversalData &backData,
|
---|
| 1110 | PolygonContainer &coincident)
|
---|
| 1111 | {
|
---|
| 1112 | mStat.nodes += 2;
|
---|
| 1113 |
|
---|
| 1114 | BspLeaf *leaf = dynamic_cast<BspLeaf *>(tData.mNode);
|
---|
| 1115 |
|
---|
| 1116 |
|
---|
[611] | 1117 |
|
---|
[463] | 1118 | // select subdivision plane
|
---|
| 1119 | BspInterior *interior =
|
---|
| 1120 | new BspInterior(SelectPlane(leaf, tData));
|
---|
[587] | 1121 |
|
---|
[611] | 1122 |
|
---|
[648] | 1123 | #ifdef _DEBUG
|
---|
[463] | 1124 | Debug << interior << endl;
|
---|
[648] | 1125 | #endif
|
---|
[463] | 1126 |
|
---|
| 1127 |
|
---|
| 1128 | // subdivide rays into front and back rays
|
---|
| 1129 | SplitRays(interior->mPlane, *tData.mRays, *frontData.mRays, *backData.mRays);
|
---|
| 1130 |
|
---|
[611] | 1131 |
|
---|
[463] | 1132 |
|
---|
| 1133 | // subdivide polygons with plane
|
---|
[491] | 1134 | mStat.polySplits += SplitPolygons(interior->GetPlane(),
|
---|
| 1135 | *tData.mPolygons,
|
---|
| 1136 | *frontData.mPolygons,
|
---|
| 1137 | *backData.mPolygons,
|
---|
| 1138 | coincident);
|
---|
[463] | 1139 |
|
---|
[611] | 1140 |
|
---|
[463] | 1141 |
|
---|
| 1142 | // compute pvs
|
---|
| 1143 | frontData.mPvs = ComputePvsSize(*frontData.mRays);
|
---|
| 1144 | backData.mPvs = ComputePvsSize(*backData.mRays);
|
---|
| 1145 |
|
---|
| 1146 | // split geometry and compute area
|
---|
| 1147 | if (1)
|
---|
| 1148 | {
|
---|
| 1149 | tData.mGeometry->SplitGeometry(*frontData.mGeometry,
|
---|
| 1150 | *backData.mGeometry,
|
---|
| 1151 | interior->mPlane,
|
---|
| 1152 | mBox,
|
---|
[646] | 1153 | //0.000000000001);
|
---|
| 1154 | mEpsilon);
|
---|
[463] | 1155 |
|
---|
| 1156 |
|
---|
[611] | 1157 | if (mUseAreaForPvs)
|
---|
| 1158 | {
|
---|
| 1159 | frontData.mProbability = frontData.mGeometry->GetArea();
|
---|
| 1160 | backData.mProbability = backData.mGeometry->GetArea();
|
---|
| 1161 | }
|
---|
| 1162 | else
|
---|
| 1163 | {
|
---|
| 1164 | frontData.mProbability = frontData.mGeometry->GetVolume();
|
---|
| 1165 | backData.mProbability = tData.mProbability - frontData.mProbability;
|
---|
| 1166 | }
|
---|
[463] | 1167 | }
|
---|
| 1168 |
|
---|
| 1169 | //-- create front and back leaf
|
---|
| 1170 |
|
---|
| 1171 | BspInterior *parent = leaf->GetParent();
|
---|
| 1172 |
|
---|
| 1173 | // replace a link from node's parent
|
---|
| 1174 | if (!leaf->IsRoot())
|
---|
| 1175 | {
|
---|
| 1176 | parent->ReplaceChildLink(leaf, interior);
|
---|
| 1177 | interior->SetParent(parent);
|
---|
| 1178 | }
|
---|
| 1179 | else // new root
|
---|
| 1180 | {
|
---|
| 1181 | mRoot = interior;
|
---|
| 1182 | }
|
---|
| 1183 |
|
---|
| 1184 | // and setup child links
|
---|
| 1185 | interior->SetupChildLinks(new BspLeaf(interior), new BspLeaf(interior));
|
---|
| 1186 |
|
---|
| 1187 | frontData.mNode = interior->GetFront();
|
---|
| 1188 | backData.mNode = interior->GetBack();
|
---|
| 1189 |
|
---|
[650] | 1190 | interior->mTimeStamp = mTimeStamp ++;
|
---|
| 1191 |
|
---|
[463] | 1192 | //DEL_PTR(leaf);
|
---|
| 1193 | return interior;
|
---|
| 1194 | }
|
---|
| 1195 |
|
---|
[582] | 1196 |
|
---|
[463] | 1197 | void BspTree::SortSplitCandidates(const PolygonContainer &polys,
|
---|
| 1198 | const int axis,
|
---|
| 1199 | vector<SortableEntry> &splitCandidates) const
|
---|
| 1200 | {
|
---|
[480] | 1201 | splitCandidates.clear();
|
---|
[463] | 1202 |
|
---|
[480] | 1203 | int requestedSize = 2 * (int)polys.size();
|
---|
| 1204 | // creates a sorted split candidates array
|
---|
| 1205 | splitCandidates.reserve(requestedSize);
|
---|
[463] | 1206 |
|
---|
[480] | 1207 | PolygonContainer::const_iterator it, it_end = polys.end();
|
---|
| 1208 |
|
---|
| 1209 | AxisAlignedBox3 box;
|
---|
| 1210 |
|
---|
| 1211 | // insert all queries
|
---|
| 1212 | for(it = polys.begin(); it != it_end; ++ it)
|
---|
| 1213 | {
|
---|
| 1214 | box.Initialize();
|
---|
| 1215 | box.Include(*(*it));
|
---|
| 1216 |
|
---|
| 1217 | splitCandidates.push_back(SortableEntry(SortableEntry::POLY_MIN, box.Min(axis), *it));
|
---|
| 1218 | splitCandidates.push_back(SortableEntry(SortableEntry::POLY_MAX, box.Max(axis), *it));
|
---|
| 1219 | }
|
---|
| 1220 |
|
---|
| 1221 | stable_sort(splitCandidates.begin(), splitCandidates.end());
|
---|
[463] | 1222 | }
|
---|
| 1223 |
|
---|
| 1224 |
|
---|
| 1225 | float BspTree::BestCostRatio(const PolygonContainer &polys,
|
---|
| 1226 | const AxisAlignedBox3 &box,
|
---|
| 1227 | const int axis,
|
---|
| 1228 | float &position,
|
---|
| 1229 | int &objectsBack,
|
---|
| 1230 | int &objectsFront) const
|
---|
| 1231 | {
|
---|
| 1232 | vector<SortableEntry> splitCandidates;
|
---|
| 1233 |
|
---|
| 1234 | SortSplitCandidates(polys, axis, splitCandidates);
|
---|
| 1235 |
|
---|
| 1236 | // go through the lists, count the number of objects left and right
|
---|
| 1237 | // and evaluate the following cost funcion:
|
---|
| 1238 | // C = ct_div_ci + (ol + or)/queries
|
---|
| 1239 |
|
---|
| 1240 | int objectsLeft = 0, objectsRight = (int)polys.size();
|
---|
| 1241 |
|
---|
| 1242 | float minBox = box.Min(axis);
|
---|
| 1243 | float maxBox = box.Max(axis);
|
---|
| 1244 | float boxArea = box.SurfaceArea();
|
---|
| 1245 |
|
---|
| 1246 | float minBand = minBox + mSplitBorder * (maxBox - minBox);
|
---|
| 1247 | float maxBand = minBox + (1.0f - mSplitBorder) * (maxBox - minBox);
|
---|
| 1248 |
|
---|
| 1249 | float minSum = 1e20f;
|
---|
| 1250 | vector<SortableEntry>::const_iterator ci, ci_end = splitCandidates.end();
|
---|
| 1251 |
|
---|
| 1252 | for(ci = splitCandidates.begin(); ci != ci_end; ++ ci)
|
---|
| 1253 | {
|
---|
| 1254 | switch ((*ci).type)
|
---|
| 1255 | {
|
---|
| 1256 | case SortableEntry::POLY_MIN:
|
---|
| 1257 | ++ objectsLeft;
|
---|
| 1258 | break;
|
---|
| 1259 | case SortableEntry::POLY_MAX:
|
---|
| 1260 | -- objectsRight;
|
---|
| 1261 | break;
|
---|
| 1262 | default:
|
---|
| 1263 | break;
|
---|
| 1264 | }
|
---|
| 1265 |
|
---|
| 1266 | if ((*ci).value > minBand && (*ci).value < maxBand)
|
---|
| 1267 | {
|
---|
| 1268 | AxisAlignedBox3 lbox = box;
|
---|
| 1269 | AxisAlignedBox3 rbox = box;
|
---|
| 1270 | lbox.SetMax(axis, (*ci).value);
|
---|
| 1271 | rbox.SetMin(axis, (*ci).value);
|
---|
| 1272 |
|
---|
[472] | 1273 | const float sum = objectsLeft * lbox.SurfaceArea() +
|
---|
| 1274 | objectsRight * rbox.SurfaceArea();
|
---|
[463] | 1275 |
|
---|
| 1276 | if (sum < minSum)
|
---|
| 1277 | {
|
---|
| 1278 | minSum = sum;
|
---|
| 1279 | position = (*ci).value;
|
---|
| 1280 |
|
---|
| 1281 | objectsBack = objectsLeft;
|
---|
| 1282 | objectsFront = objectsRight;
|
---|
| 1283 | }
|
---|
| 1284 | }
|
---|
| 1285 | }
|
---|
| 1286 |
|
---|
[472] | 1287 | const float oldCost = (float)polys.size();
|
---|
| 1288 | const float newCost = mAxisAlignedCtDivCi + minSum / boxArea;
|
---|
| 1289 | const float ratio = newCost / oldCost;
|
---|
[463] | 1290 |
|
---|
| 1291 |
|
---|
| 1292 | #if 0
|
---|
| 1293 | Debug << "====================" << endl;
|
---|
| 1294 | Debug << "costRatio=" << ratio << " pos=" << position<<" t=" << (position - minBox)/(maxBox - minBox)
|
---|
| 1295 | << "\t o=(" << objectsBack << "," << objectsFront << ")" << endl;
|
---|
| 1296 | #endif
|
---|
| 1297 | return ratio;
|
---|
| 1298 | }
|
---|
| 1299 |
|
---|
| 1300 | bool BspTree::SelectAxisAlignedPlane(Plane3 &plane,
|
---|
| 1301 | const PolygonContainer &polys) const
|
---|
| 1302 | {
|
---|
| 1303 | AxisAlignedBox3 box;
|
---|
| 1304 | box.Initialize();
|
---|
| 1305 |
|
---|
| 1306 | // create bounding box of region
|
---|
| 1307 | Polygon3::IncludeInBox(polys, box);
|
---|
| 1308 |
|
---|
| 1309 | int objectsBack = 0, objectsFront = 0;
|
---|
| 1310 | int axis = 0;
|
---|
| 1311 | float costRatio = MAX_FLOAT;
|
---|
| 1312 | Vector3 position;
|
---|
| 1313 |
|
---|
| 1314 | //-- area subdivision
|
---|
| 1315 | for (int i = 0; i < 3; ++ i)
|
---|
| 1316 | {
|
---|
| 1317 | float p = 0;
|
---|
| 1318 | float r = BestCostRatio(polys, box, i, p, objectsBack, objectsFront);
|
---|
| 1319 |
|
---|
| 1320 | if (r < costRatio)
|
---|
| 1321 | {
|
---|
| 1322 | costRatio = r;
|
---|
| 1323 | axis = i;
|
---|
| 1324 | position = p;
|
---|
| 1325 | }
|
---|
| 1326 | }
|
---|
| 1327 |
|
---|
| 1328 | if (costRatio >= mMaxCostRatio)
|
---|
| 1329 | return false;
|
---|
| 1330 |
|
---|
| 1331 | Vector3 norm(0,0,0); norm[axis] = 1.0f;
|
---|
| 1332 | plane = Plane3(norm, position);
|
---|
| 1333 |
|
---|
| 1334 | return true;
|
---|
| 1335 | }
|
---|
| 1336 |
|
---|
[545] | 1337 |
|
---|
[463] | 1338 | Plane3 BspTree::SelectPlane(BspLeaf *leaf, BspTraversalData &data)
|
---|
| 1339 | {
|
---|
[646] | 1340 | if ((!mMaxPolyCandidates || data.mPolygons->empty()) &&
|
---|
| 1341 | (!mMaxRayCandidates || data.mRays->empty()))
|
---|
[463] | 1342 | {
|
---|
| 1343 | Debug << "Warning: No autopartition polygon candidate available\n";
|
---|
| 1344 |
|
---|
| 1345 | // return axis aligned split
|
---|
| 1346 | AxisAlignedBox3 box;
|
---|
| 1347 | box.Initialize();
|
---|
| 1348 |
|
---|
| 1349 | // create bounding box of region
|
---|
| 1350 | Polygon3::IncludeInBox(*data.mPolygons, box);
|
---|
| 1351 |
|
---|
| 1352 | const int axis = box.Size().DrivingAxis();
|
---|
[587] | 1353 | const Vector3 position = (box.Min()[axis] + box.Max()[axis]) * 0.5f;
|
---|
[463] | 1354 |
|
---|
| 1355 | Vector3 norm(0,0,0); norm[axis] = 1.0f;
|
---|
| 1356 | return Plane3(norm, position);
|
---|
| 1357 | }
|
---|
| 1358 |
|
---|
| 1359 | if ((mSplitPlaneStrategy & AXIS_ALIGNED) &&
|
---|
| 1360 | ((int)data.mPolygons->size() > mTermMinPolysForAxisAligned) &&
|
---|
| 1361 | ((int)data.mRays->size() > mTermMinRaysForAxisAligned) &&
|
---|
| 1362 | ((mTermMinObjectsForAxisAligned < 0) ||
|
---|
[587] | 1363 | (Polygon3::ParentObjectsSize(*data.mPolygons) > mTermMinObjectsForAxisAligned)))
|
---|
[463] | 1364 | {
|
---|
| 1365 | Plane3 plane;
|
---|
| 1366 | if (SelectAxisAlignedPlane(plane, *data.mPolygons))
|
---|
| 1367 | return plane;
|
---|
| 1368 | }
|
---|
| 1369 |
|
---|
| 1370 | // simplest strategy: just take next polygon
|
---|
| 1371 | if (mSplitPlaneStrategy & RANDOM_POLYGON)
|
---|
| 1372 | {
|
---|
| 1373 | if (!data.mPolygons->empty())
|
---|
| 1374 | {
|
---|
[478] | 1375 | Polygon3 *nextPoly =
|
---|
| 1376 | (*data.mPolygons)[(int)RandomValue(0, (Real)((int)data.mPolygons->size() - 1))];
|
---|
[463] | 1377 | return nextPoly->GetSupportingPlane();
|
---|
| 1378 | }
|
---|
| 1379 | else
|
---|
| 1380 | {
|
---|
[475] | 1381 | const int candidateIdx = (int)RandomValue(0, (Real)((int)data.mRays->size() - 1));
|
---|
[463] | 1382 | BoundedRay *bRay = (*data.mRays)[candidateIdx];
|
---|
| 1383 |
|
---|
| 1384 | Ray *ray = bRay->mRay;
|
---|
| 1385 |
|
---|
| 1386 | const Vector3 minPt = ray->Extrap(bRay->mMinT);
|
---|
| 1387 | const Vector3 maxPt = ray->Extrap(bRay->mMaxT);
|
---|
| 1388 |
|
---|
| 1389 | const Vector3 pt = (maxPt + minPt) * 0.5;
|
---|
| 1390 |
|
---|
| 1391 | const Vector3 normal = ray->GetDir();
|
---|
| 1392 |
|
---|
| 1393 | return Plane3(normal, pt);
|
---|
| 1394 | }
|
---|
| 1395 |
|
---|
| 1396 | return Plane3();
|
---|
| 1397 | }
|
---|
| 1398 |
|
---|
| 1399 | // use heuristics to find appropriate plane
|
---|
| 1400 | return SelectPlaneHeuristics(leaf, data);
|
---|
| 1401 | }
|
---|
| 1402 |
|
---|
[478] | 1403 |
|
---|
| 1404 | Plane3 BspTree::ChooseCandidatePlane(const BoundedRayContainer &rays) const
|
---|
[479] | 1405 | {
|
---|
| 1406 | const int candidateIdx = (int)RandomValue(0, (Real)((int)rays.size() - 1));
|
---|
| 1407 | BoundedRay *bRay = rays[candidateIdx];
|
---|
| 1408 | Ray *ray = bRay->mRay;
|
---|
[478] | 1409 |
|
---|
[479] | 1410 | const Vector3 minPt = ray->Extrap(bRay->mMinT);
|
---|
| 1411 | const Vector3 maxPt = ray->Extrap(bRay->mMaxT);
|
---|
| 1412 |
|
---|
[478] | 1413 | const Vector3 pt = (maxPt + minPt) * 0.5;
|
---|
| 1414 |
|
---|
[479] | 1415 | const Vector3 normal = ray->GetDir();
|
---|
| 1416 |
|
---|
| 1417 | return Plane3(normal, pt);
|
---|
[478] | 1418 | }
|
---|
| 1419 |
|
---|
| 1420 | Plane3 BspTree::ChooseCandidatePlane2(const BoundedRayContainer &rays) const
|
---|
[479] | 1421 | {
|
---|
| 1422 | Vector3 pt[3];
|
---|
[478] | 1423 | int idx[3];
|
---|
| 1424 | int cmaxT = 0;
|
---|
| 1425 | int cminT = 0;
|
---|
| 1426 | bool chooseMin = false;
|
---|
| 1427 |
|
---|
[479] | 1428 | for (int j = 0; j < 3; j ++)
|
---|
[478] | 1429 | {
|
---|
[479] | 1430 | idx[j] = (int)RandomValue(0, Real((int)rays.size() * 2 - 1));
|
---|
| 1431 |
|
---|
[478] | 1432 | if (idx[j] >= (int)rays.size())
|
---|
| 1433 | {
|
---|
[479] | 1434 | idx[j] -= (int)rays.size();
|
---|
[478] | 1435 | chooseMin = (cminT < 2);
|
---|
| 1436 | }
|
---|
| 1437 | else
|
---|
| 1438 | chooseMin = (cmaxT < 2);
|
---|
| 1439 |
|
---|
[479] | 1440 | BoundedRay *bRay = rays[idx[j]];
|
---|
| 1441 | pt[j] = chooseMin ? bRay->mRay->Extrap(bRay->mMinT) :
|
---|
| 1442 | bRay->mRay->Extrap(bRay->mMaxT);
|
---|
[478] | 1443 | }
|
---|
[479] | 1444 |
|
---|
| 1445 | return Plane3(pt[0], pt[1], pt[2]);
|
---|
[478] | 1446 | }
|
---|
| 1447 |
|
---|
| 1448 | Plane3 BspTree::ChooseCandidatePlane3(const BoundedRayContainer &rays) const
|
---|
[479] | 1449 | {
|
---|
[478] | 1450 | Vector3 pt[3];
|
---|
| 1451 |
|
---|
| 1452 | int idx1 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
|
---|
| 1453 | int idx2 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
|
---|
| 1454 |
|
---|
| 1455 | // check if rays different
|
---|
| 1456 | if (idx1 == idx2)
|
---|
| 1457 | idx2 = (idx2 + 1) % (int)rays.size();
|
---|
| 1458 |
|
---|
[479] | 1459 | const BoundedRay *ray1 = rays[idx1];
|
---|
| 1460 | const BoundedRay *ray2 = rays[idx2];
|
---|
[478] | 1461 |
|
---|
| 1462 | // normal vector of the plane parallel to both lines
|
---|
[479] | 1463 | const Vector3 norm =
|
---|
| 1464 | Normalize(CrossProd(ray1->mRay->GetDir(), ray2->mRay->GetDir()));
|
---|
[478] | 1465 |
|
---|
[479] | 1466 | const Vector3 orig1 = ray1->mRay->Extrap(ray1->mMinT);
|
---|
| 1467 | const Vector3 orig2 = ray2->mRay->Extrap(ray2->mMinT);
|
---|
| 1468 |
|
---|
[478] | 1469 | // vector from line 1 to line 2
|
---|
[479] | 1470 | const Vector3 vd = orig1 - orig2;
|
---|
[478] | 1471 |
|
---|
| 1472 | // project vector on normal to get distance
|
---|
| 1473 | const float dist = DotProd(vd, norm);
|
---|
| 1474 |
|
---|
| 1475 | // point on plane lies halfway between the two planes
|
---|
[479] | 1476 | const Vector3 planePt = orig1 + norm * dist * 0.5;
|
---|
[478] | 1477 |
|
---|
[479] | 1478 | return Plane3(norm, planePt);
|
---|
[478] | 1479 | }
|
---|
| 1480 |
|
---|
| 1481 |
|
---|
[463] | 1482 | Plane3 BspTree::SelectPlaneHeuristics(BspLeaf *leaf, BspTraversalData &data)
|
---|
| 1483 | {
|
---|
| 1484 | float lowestCost = MAX_FLOAT;
|
---|
| 1485 | Plane3 bestPlane;
|
---|
[478] | 1486 | // intermediate plane
|
---|
[463] | 1487 | Plane3 plane;
|
---|
| 1488 |
|
---|
[478] | 1489 | const int limit = Min((int)data.mPolygons->size(), mMaxPolyCandidates);
|
---|
| 1490 | int maxIdx = (int)data.mPolygons->size();
|
---|
[463] | 1491 |
|
---|
| 1492 | for (int i = 0; i < limit; ++ i)
|
---|
| 1493 | {
|
---|
[478] | 1494 | // assure that no index is taken twice
|
---|
| 1495 | const int candidateIdx = (int)RandomValue(0, (Real)(-- maxIdx));
|
---|
[587] | 1496 |
|
---|
[463] | 1497 | Polygon3 *poly = (*data.mPolygons)[candidateIdx];
|
---|
[478] | 1498 |
|
---|
| 1499 | // swap candidate to the end to avoid testing same plane
|
---|
| 1500 | std::swap((*data.mPolygons)[maxIdx], (*data.mPolygons)[candidateIdx]);
|
---|
| 1501 | //Polygon3 *poly = (*data.mPolygons)[(int)RandomValue(0, (int)polys.size() - 1)];
|
---|
| 1502 |
|
---|
[463] | 1503 | // evaluate current candidate
|
---|
| 1504 | const float candidateCost =
|
---|
| 1505 | SplitPlaneCost(poly->GetSupportingPlane(), data);
|
---|
| 1506 |
|
---|
| 1507 | if (candidateCost < lowestCost)
|
---|
| 1508 | {
|
---|
| 1509 | bestPlane = poly->GetSupportingPlane();
|
---|
| 1510 | lowestCost = candidateCost;
|
---|
| 1511 | }
|
---|
| 1512 | }
|
---|
| 1513 |
|
---|
[495] | 1514 | //-- choose candidate planes extracted from rays
|
---|
[478] | 1515 | for (int i = 0; i < mMaxRayCandidates; ++ i)
|
---|
[463] | 1516 | {
|
---|
[478] | 1517 | plane = ChooseCandidatePlane3(*data.mRays);
|
---|
[463] | 1518 | const float candidateCost = SplitPlaneCost(plane, data);
|
---|
| 1519 |
|
---|
| 1520 | if (candidateCost < lowestCost)
|
---|
| 1521 | {
|
---|
[478] | 1522 | bestPlane = plane;
|
---|
[463] | 1523 | lowestCost = candidateCost;
|
---|
| 1524 | }
|
---|
| 1525 | }
|
---|
| 1526 |
|
---|
| 1527 | #ifdef _DEBUG
|
---|
| 1528 | Debug << "plane lowest cost: " << lowestCost << endl;
|
---|
| 1529 | #endif
|
---|
[648] | 1530 |
|
---|
[463] | 1531 | return bestPlane;
|
---|
| 1532 | }
|
---|
| 1533 |
|
---|
| 1534 |
|
---|
| 1535 | float BspTree::SplitPlaneCost(const Plane3 &candidatePlane,
|
---|
| 1536 | const PolygonContainer &polys) const
|
---|
| 1537 | {
|
---|
| 1538 | float val = 0;
|
---|
| 1539 |
|
---|
| 1540 | float sumBalancedPolys = 0;
|
---|
| 1541 | float sumSplits = 0;
|
---|
| 1542 | float sumPolyArea = 0;
|
---|
| 1543 | float sumBalancedViewCells = 0;
|
---|
| 1544 | float sumBlockedRays = 0;
|
---|
| 1545 | float totalBlockedRays = 0;
|
---|
| 1546 | //float totalArea = 0;
|
---|
| 1547 | int totalViewCells = 0;
|
---|
| 1548 |
|
---|
| 1549 | // need three unique ids for each type of view cell
|
---|
| 1550 | // for balanced view cells criterium
|
---|
| 1551 | ViewCell::NewMail();
|
---|
| 1552 | const int backId = ViewCell::sMailId;
|
---|
| 1553 | ViewCell::NewMail();
|
---|
| 1554 | const int frontId = ViewCell::sMailId;
|
---|
| 1555 | ViewCell::NewMail();
|
---|
| 1556 | const int frontAndBackId = ViewCell::sMailId;
|
---|
| 1557 |
|
---|
[644] | 1558 | bool useRand;
|
---|
[463] | 1559 | int limit;
|
---|
| 1560 |
|
---|
| 1561 | // choose test polyongs randomly if over threshold
|
---|
| 1562 | if ((int)polys.size() > mMaxTests)
|
---|
| 1563 | {
|
---|
| 1564 | useRand = true;
|
---|
| 1565 | limit = mMaxTests;
|
---|
| 1566 | }
|
---|
| 1567 | else
|
---|
| 1568 | {
|
---|
| 1569 | useRand = false;
|
---|
| 1570 | limit = (int)polys.size();
|
---|
| 1571 | }
|
---|
| 1572 |
|
---|
| 1573 | for (int i = 0; i < limit; ++ i)
|
---|
| 1574 | {
|
---|
[478] | 1575 | const int testIdx = useRand ? (int)RandomValue(0, (Real)(limit - 1)) : i;
|
---|
[463] | 1576 |
|
---|
| 1577 | Polygon3 *poly = polys[testIdx];
|
---|
| 1578 |
|
---|
| 1579 | const int classification =
|
---|
| 1580 | poly->ClassifyPlane(candidatePlane, mEpsilon);
|
---|
| 1581 |
|
---|
| 1582 | if (mSplitPlaneStrategy & BALANCED_POLYS)
|
---|
| 1583 | sumBalancedPolys += sBalancedPolysTable[classification];
|
---|
| 1584 |
|
---|
| 1585 | if (mSplitPlaneStrategy & LEAST_SPLITS)
|
---|
| 1586 | sumSplits += sLeastPolySplitsTable[classification];
|
---|
| 1587 |
|
---|
| 1588 | if (mSplitPlaneStrategy & LARGEST_POLY_AREA)
|
---|
| 1589 | {
|
---|
| 1590 | if (classification == Polygon3::COINCIDENT)
|
---|
| 1591 | sumPolyArea += poly->GetArea();
|
---|
| 1592 | //totalArea += area;
|
---|
| 1593 | }
|
---|
| 1594 |
|
---|
| 1595 | if (mSplitPlaneStrategy & BLOCKED_RAYS)
|
---|
| 1596 | {
|
---|
| 1597 | const float blockedRays = (float)poly->mPiercingRays.size();
|
---|
| 1598 |
|
---|
| 1599 | if (classification == Polygon3::COINCIDENT)
|
---|
| 1600 | sumBlockedRays += blockedRays;
|
---|
| 1601 |
|
---|
| 1602 | totalBlockedRays += blockedRays;
|
---|
| 1603 | }
|
---|
| 1604 |
|
---|
| 1605 | // assign view cells to back or front according to classificaion
|
---|
| 1606 | if (mSplitPlaneStrategy & BALANCED_VIEW_CELLS)
|
---|
| 1607 | {
|
---|
| 1608 | MeshInstance *viewCell = poly->mParent;
|
---|
| 1609 |
|
---|
| 1610 | // assure that we only count a view cell
|
---|
| 1611 | // once for the front and once for the back side of the plane
|
---|
| 1612 | if (classification == Polygon3::FRONT_SIDE)
|
---|
| 1613 | {
|
---|
| 1614 | if ((viewCell->mMailbox != frontId) &&
|
---|
| 1615 | (viewCell->mMailbox != frontAndBackId))
|
---|
| 1616 | {
|
---|
| 1617 | sumBalancedViewCells += 1.0;
|
---|
| 1618 |
|
---|
| 1619 | if (viewCell->mMailbox != backId)
|
---|
| 1620 | viewCell->mMailbox = frontId;
|
---|
| 1621 | else
|
---|
| 1622 | viewCell->mMailbox = frontAndBackId;
|
---|
| 1623 |
|
---|
| 1624 | ++ totalViewCells;
|
---|
| 1625 | }
|
---|
| 1626 | }
|
---|
| 1627 | else if (classification == Polygon3::BACK_SIDE)
|
---|
| 1628 | {
|
---|
| 1629 | if ((viewCell->mMailbox != backId) &&
|
---|
| 1630 | (viewCell->mMailbox != frontAndBackId))
|
---|
| 1631 | {
|
---|
| 1632 | sumBalancedViewCells -= 1.0;
|
---|
| 1633 |
|
---|
| 1634 | if (viewCell->mMailbox != frontId)
|
---|
| 1635 | viewCell->mMailbox = backId;
|
---|
| 1636 | else
|
---|
| 1637 | viewCell->mMailbox = frontAndBackId;
|
---|
| 1638 |
|
---|
| 1639 | ++ totalViewCells;
|
---|
| 1640 | }
|
---|
| 1641 | }
|
---|
| 1642 | }
|
---|
| 1643 | }
|
---|
| 1644 |
|
---|
| 1645 | const float polysSize = (float)polys.size() + Limits::Small;
|
---|
| 1646 |
|
---|
| 1647 | // all values should be approx. between 0 and 1 so they can be combined
|
---|
| 1648 | // and scaled with the factors according to their importance
|
---|
| 1649 | if (mSplitPlaneStrategy & BALANCED_POLYS)
|
---|
| 1650 | val += mBalancedPolysFactor * fabs(sumBalancedPolys) / polysSize;
|
---|
| 1651 |
|
---|
| 1652 | if (mSplitPlaneStrategy & LEAST_SPLITS)
|
---|
| 1653 | val += mLeastSplitsFactor * sumSplits / polysSize;
|
---|
| 1654 |
|
---|
| 1655 | if (mSplitPlaneStrategy & LARGEST_POLY_AREA)
|
---|
| 1656 | // HACK: polys.size should be total area so scaling is between 0 and 1
|
---|
| 1657 | val += mLargestPolyAreaFactor * (float)polys.size() / sumPolyArea;
|
---|
| 1658 |
|
---|
| 1659 | if (mSplitPlaneStrategy & BLOCKED_RAYS)
|
---|
| 1660 | if (totalBlockedRays != 0)
|
---|
| 1661 | val += mBlockedRaysFactor * (totalBlockedRays - sumBlockedRays) / totalBlockedRays;
|
---|
| 1662 |
|
---|
| 1663 | if (mSplitPlaneStrategy & BALANCED_VIEW_CELLS)
|
---|
| 1664 | val += mBalancedViewCellsFactor * fabs(sumBalancedViewCells) /
|
---|
| 1665 | ((float)totalViewCells + Limits::Small);
|
---|
| 1666 |
|
---|
| 1667 | return val;
|
---|
| 1668 | }
|
---|
| 1669 |
|
---|
| 1670 |
|
---|
| 1671 | inline void BspTree::GenerateUniqueIdsForPvs()
|
---|
| 1672 | {
|
---|
[611] | 1673 | ViewCell::NewMail(); sBackId = ViewCell::sMailId;
|
---|
| 1674 | ViewCell::NewMail(); sFrontId = ViewCell::sMailId;
|
---|
| 1675 | ViewCell::NewMail(); sFrontAndBackId = ViewCell::sMailId;
|
---|
[463] | 1676 | }
|
---|
| 1677 |
|
---|
[551] | 1678 |
|
---|
[463] | 1679 | float BspTree::SplitPlaneCost(const Plane3 &candidatePlane,
|
---|
| 1680 | const BoundedRayContainer &rays,
|
---|
| 1681 | const int pvs,
|
---|
[587] | 1682 | const float probability,
|
---|
[463] | 1683 | const BspNodeGeometry &cell) const
|
---|
| 1684 | {
|
---|
| 1685 | float val = 0;
|
---|
| 1686 |
|
---|
| 1687 | float sumBalancedRays = 0;
|
---|
| 1688 | float sumRaySplits = 0;
|
---|
| 1689 |
|
---|
| 1690 | int frontPvs = 0;
|
---|
| 1691 | int backPvs = 0;
|
---|
| 1692 |
|
---|
| 1693 | // probability that view point lies in child
|
---|
| 1694 | float pOverall = 0;
|
---|
| 1695 | float pFront = 0;
|
---|
| 1696 | float pBack = 0;
|
---|
| 1697 |
|
---|
| 1698 | const bool pvsUseLen = false;
|
---|
| 1699 |
|
---|
| 1700 | if (mSplitPlaneStrategy & PVS)
|
---|
| 1701 | {
|
---|
| 1702 | // create unique ids for pvs heuristics
|
---|
| 1703 | GenerateUniqueIdsForPvs();
|
---|
| 1704 |
|
---|
[587] | 1705 | // construct child geometry with regard to the candidate split plane
|
---|
| 1706 | BspNodeGeometry frontCell;
|
---|
| 1707 | BspNodeGeometry backCell;
|
---|
| 1708 |
|
---|
| 1709 | cell.SplitGeometry(frontCell,
|
---|
| 1710 | backCell,
|
---|
| 1711 | candidatePlane,
|
---|
| 1712 | mBox,
|
---|
| 1713 | mEpsilon);
|
---|
| 1714 |
|
---|
| 1715 | if (mUseAreaForPvs)
|
---|
[463] | 1716 | {
|
---|
| 1717 | pFront = frontCell.GetArea();
|
---|
| 1718 | pBack = backCell.GetArea();
|
---|
[587] | 1719 | }
|
---|
| 1720 | else
|
---|
| 1721 | {
|
---|
| 1722 | pFront = frontCell.GetVolume();
|
---|
[605] | 1723 | pBack = pOverall - pFront;
|
---|
[587] | 1724 | }
|
---|
| 1725 |
|
---|
[463] | 1726 |
|
---|
[587] | 1727 | pOverall = probability;
|
---|
[463] | 1728 | }
|
---|
| 1729 |
|
---|
[545] | 1730 | bool useRand;
|
---|
[463] | 1731 | int limit;
|
---|
| 1732 |
|
---|
| 1733 | // choose test polyongs randomly if over threshold
|
---|
| 1734 | if ((int)rays.size() > mMaxTests)
|
---|
| 1735 | {
|
---|
| 1736 | useRand = true;
|
---|
| 1737 | limit = mMaxTests;
|
---|
| 1738 | }
|
---|
| 1739 | else
|
---|
| 1740 | {
|
---|
| 1741 | useRand = false;
|
---|
| 1742 | limit = (int)rays.size();
|
---|
| 1743 | }
|
---|
| 1744 |
|
---|
| 1745 | for (int i = 0; i < limit; ++ i)
|
---|
| 1746 | {
|
---|
[475] | 1747 | const int testIdx = useRand ? (int)RandomValue(0, (Real)(limit - 1)) : i;
|
---|
[463] | 1748 |
|
---|
| 1749 | BoundedRay *bRay = rays[testIdx];
|
---|
| 1750 |
|
---|
| 1751 | Ray *ray = bRay->mRay;
|
---|
| 1752 | const float minT = bRay->mMinT;
|
---|
| 1753 | const float maxT = bRay->mMaxT;
|
---|
| 1754 |
|
---|
| 1755 | Vector3 entP, extP;
|
---|
| 1756 |
|
---|
| 1757 | const int cf =
|
---|
| 1758 | ray->ClassifyPlane(candidatePlane, minT, maxT, entP, extP);
|
---|
| 1759 |
|
---|
| 1760 | if (mSplitPlaneStrategy & LEAST_RAY_SPLITS)
|
---|
| 1761 | {
|
---|
| 1762 | sumBalancedRays += sBalancedRaysTable[cf];
|
---|
| 1763 | }
|
---|
| 1764 |
|
---|
| 1765 | if (mSplitPlaneStrategy & BALANCED_RAYS)
|
---|
| 1766 | {
|
---|
| 1767 | sumRaySplits += sLeastRaySplitsTable[cf];
|
---|
| 1768 | }
|
---|
| 1769 |
|
---|
| 1770 | if (mSplitPlaneStrategy & PVS)
|
---|
| 1771 | {
|
---|
| 1772 | // in case the ray intersects an object
|
---|
| 1773 | // assure that we only count the object
|
---|
| 1774 | // once for the front and once for the back side of the plane
|
---|
| 1775 |
|
---|
| 1776 | // add the termination object
|
---|
| 1777 | if (!ray->intersections.empty())
|
---|
| 1778 | AddObjToPvs(ray->intersections[0].mObject, cf, frontPvs, backPvs);
|
---|
| 1779 |
|
---|
| 1780 | // add the source object
|
---|
| 1781 | AddObjToPvs(ray->sourceObject.mObject, cf, frontPvs, backPvs);
|
---|
| 1782 | }
|
---|
| 1783 | }
|
---|
| 1784 |
|
---|
| 1785 | const float raysSize = (float)rays.size() + Limits::Small;
|
---|
| 1786 |
|
---|
| 1787 | if (mSplitPlaneStrategy & LEAST_RAY_SPLITS)
|
---|
| 1788 | val += mLeastRaySplitsFactor * sumRaySplits / raysSize;
|
---|
| 1789 |
|
---|
| 1790 | if (mSplitPlaneStrategy & BALANCED_RAYS)
|
---|
| 1791 | val += mBalancedRaysFactor * fabs(sumBalancedRays) / raysSize;
|
---|
| 1792 |
|
---|
| 1793 | const float denom = pOverall * (float)pvs * 2.0f + Limits::Small;
|
---|
| 1794 |
|
---|
| 1795 | if (mSplitPlaneStrategy & PVS)
|
---|
| 1796 | {
|
---|
| 1797 | val += mPvsFactor * (frontPvs * pFront + (backPvs * pBack)) / denom;
|
---|
| 1798 |
|
---|
| 1799 | // give penalty to unbalanced split
|
---|
| 1800 | if (0)
|
---|
| 1801 | if (((pFront * 0.2 + Limits::Small) > pBack) ||
|
---|
| 1802 | (pFront < (pBack * 0.2 + Limits::Small)))
|
---|
| 1803 | val += 0.5;
|
---|
| 1804 | }
|
---|
| 1805 |
|
---|
| 1806 |
|
---|
| 1807 | #ifdef _DEBUG
|
---|
| 1808 | Debug << "totalpvs: " << pvs << " ptotal: " << pOverall
|
---|
| 1809 | << " frontpvs: " << frontPvs << " pFront: " << pFront
|
---|
| 1810 | << " backpvs: " << backPvs << " pBack: " << pBack << endl << endl;
|
---|
| 1811 | #endif
|
---|
| 1812 |
|
---|
| 1813 | return val;
|
---|
| 1814 | }
|
---|
| 1815 |
|
---|
| 1816 | void BspTree::AddObjToPvs(Intersectable *obj,
|
---|
| 1817 | const int cf,
|
---|
| 1818 | int &frontPvs,
|
---|
| 1819 | int &backPvs) const
|
---|
| 1820 | {
|
---|
| 1821 | if (!obj)
|
---|
| 1822 | return;
|
---|
| 1823 | // TODO: does this really belong to no pvs?
|
---|
| 1824 | //if (cf == Ray::COINCIDENT) return;
|
---|
| 1825 |
|
---|
| 1826 | // object belongs to both PVS
|
---|
| 1827 | const bool bothSides = (cf == Ray::FRONT_BACK) ||
|
---|
| 1828 | (cf == Ray::BACK_FRONT) ||
|
---|
| 1829 | (cf == Ray::COINCIDENT);
|
---|
| 1830 |
|
---|
| 1831 | if ((cf == Ray::FRONT) || bothSides)
|
---|
| 1832 | {
|
---|
| 1833 | if ((obj->mMailbox != sFrontId) &&
|
---|
| 1834 | (obj->mMailbox != sFrontAndBackId))
|
---|
| 1835 | {
|
---|
| 1836 | ++ frontPvs;
|
---|
| 1837 |
|
---|
| 1838 | if (obj->mMailbox == sBackId)
|
---|
| 1839 | obj->mMailbox = sFrontAndBackId;
|
---|
| 1840 | else
|
---|
| 1841 | obj->mMailbox = sFrontId;
|
---|
| 1842 | }
|
---|
| 1843 | }
|
---|
| 1844 |
|
---|
| 1845 | if ((cf == Ray::BACK) || bothSides)
|
---|
| 1846 | {
|
---|
| 1847 | if ((obj->mMailbox != sBackId) &&
|
---|
| 1848 | (obj->mMailbox != sFrontAndBackId))
|
---|
| 1849 | {
|
---|
| 1850 | ++ backPvs;
|
---|
| 1851 |
|
---|
| 1852 | if (obj->mMailbox == sFrontId)
|
---|
| 1853 | obj->mMailbox = sFrontAndBackId;
|
---|
| 1854 | else
|
---|
| 1855 | obj->mMailbox = sBackId;
|
---|
| 1856 | }
|
---|
| 1857 | }
|
---|
| 1858 | }
|
---|
| 1859 |
|
---|
[644] | 1860 |
|
---|
[463] | 1861 | float BspTree::SplitPlaneCost(const Plane3 &candidatePlane,
|
---|
| 1862 | BspTraversalData &data) const
|
---|
| 1863 | {
|
---|
| 1864 | float val = 0;
|
---|
| 1865 |
|
---|
| 1866 | if (mSplitPlaneStrategy & VERTICAL_AXIS)
|
---|
| 1867 | {
|
---|
| 1868 | Vector3 tinyAxis(0,0,0); tinyAxis[mBox.Size().TinyAxis()] = 1.0f;
|
---|
| 1869 | // we put a penalty on the dot product between the "tiny" vertical axis
|
---|
| 1870 | // and the split plane axis
|
---|
| 1871 | val += mVerticalSplitsFactor *
|
---|
| 1872 | fabs(DotProd(candidatePlane.mNormal, tinyAxis));
|
---|
| 1873 | }
|
---|
| 1874 |
|
---|
| 1875 | // the following criteria loop over all polygons to find the cost value
|
---|
| 1876 | if ((mSplitPlaneStrategy & BALANCED_POLYS) ||
|
---|
| 1877 | (mSplitPlaneStrategy & LEAST_SPLITS) ||
|
---|
| 1878 | (mSplitPlaneStrategy & LARGEST_POLY_AREA) ||
|
---|
| 1879 | (mSplitPlaneStrategy & BALANCED_VIEW_CELLS) ||
|
---|
| 1880 | (mSplitPlaneStrategy & BLOCKED_RAYS))
|
---|
| 1881 | {
|
---|
| 1882 | val += SplitPlaneCost(candidatePlane, *data.mPolygons);
|
---|
| 1883 | }
|
---|
| 1884 |
|
---|
| 1885 | // the following criteria loop over all rays to find the cost value
|
---|
| 1886 | if ((mSplitPlaneStrategy & BALANCED_RAYS) ||
|
---|
| 1887 | (mSplitPlaneStrategy & LEAST_RAY_SPLITS) ||
|
---|
| 1888 | (mSplitPlaneStrategy & PVS))
|
---|
| 1889 | {
|
---|
| 1890 | val += SplitPlaneCost(candidatePlane, *data.mRays, data.mPvs,
|
---|
[587] | 1891 | data.mProbability, *data.mGeometry);
|
---|
[463] | 1892 | }
|
---|
| 1893 |
|
---|
| 1894 | // return linear combination of the sums
|
---|
| 1895 | return val;
|
---|
| 1896 | }
|
---|
| 1897 |
|
---|
| 1898 | void BspTree::CollectLeaves(vector<BspLeaf *> &leaves) const
|
---|
| 1899 | {
|
---|
| 1900 | stack<BspNode *> nodeStack;
|
---|
| 1901 | nodeStack.push(mRoot);
|
---|
| 1902 |
|
---|
| 1903 | while (!nodeStack.empty())
|
---|
| 1904 | {
|
---|
| 1905 | BspNode *node = nodeStack.top();
|
---|
| 1906 |
|
---|
| 1907 | nodeStack.pop();
|
---|
| 1908 |
|
---|
| 1909 | if (node->IsLeaf())
|
---|
| 1910 | {
|
---|
| 1911 | BspLeaf *leaf = (BspLeaf *)node;
|
---|
| 1912 | leaves.push_back(leaf);
|
---|
| 1913 | }
|
---|
| 1914 | else
|
---|
| 1915 | {
|
---|
| 1916 | BspInterior *interior = dynamic_cast<BspInterior *>(node);
|
---|
| 1917 |
|
---|
| 1918 | nodeStack.push(interior->GetBack());
|
---|
| 1919 | nodeStack.push(interior->GetFront());
|
---|
| 1920 | }
|
---|
| 1921 | }
|
---|
| 1922 | }
|
---|
| 1923 |
|
---|
[487] | 1924 |
|
---|
[463] | 1925 | AxisAlignedBox3 BspTree::GetBoundingBox() const
|
---|
| 1926 | {
|
---|
| 1927 | return mBox;
|
---|
| 1928 | }
|
---|
| 1929 |
|
---|
[487] | 1930 |
|
---|
[463] | 1931 | void BspTree::EvaluateLeafStats(const BspTraversalData &data)
|
---|
| 1932 | {
|
---|
| 1933 | // the node became a leaf -> evaluate stats for leafs
|
---|
| 1934 | BspLeaf *leaf = dynamic_cast<BspLeaf *>(data.mNode);
|
---|
| 1935 |
|
---|
| 1936 | // store maximal and minimal depth
|
---|
| 1937 | if (data.mDepth > mStat.maxDepth)
|
---|
| 1938 | mStat.maxDepth = data.mDepth;
|
---|
| 1939 |
|
---|
| 1940 | if (data.mDepth < mStat.minDepth)
|
---|
| 1941 | mStat.minDepth = data.mDepth;
|
---|
| 1942 |
|
---|
| 1943 | // accumulate depth to compute average depth
|
---|
| 1944 | mStat.accumDepth += data.mDepth;
|
---|
[503] | 1945 | // accumulate rays to compute rays / leaf
|
---|
| 1946 | mStat.accumRays += (int)data.mRays->size();
|
---|
[463] | 1947 |
|
---|
| 1948 | if (data.mDepth >= mTermMaxDepth)
|
---|
| 1949 | ++ mStat.maxDepthNodes;
|
---|
| 1950 |
|
---|
| 1951 | if (data.mPvs < mTermMinPvs)
|
---|
| 1952 | ++ mStat.minPvsNodes;
|
---|
| 1953 |
|
---|
| 1954 | if ((int)data.mRays->size() < mTermMinRays)
|
---|
| 1955 | ++ mStat.minRaysNodes;
|
---|
| 1956 |
|
---|
| 1957 | if (data.GetAvgRayContribution() > mTermMaxRayContribution)
|
---|
| 1958 | ++ mStat.maxRayContribNodes;
|
---|
| 1959 |
|
---|
[587] | 1960 | if (data.mProbability <= mTermMinProbability)
|
---|
[547] | 1961 | ++ mStat.minProbabilityNodes;
|
---|
[463] | 1962 |
|
---|
| 1963 | #ifdef _DEBUG
|
---|
| 1964 | Debug << "BSP stats: "
|
---|
| 1965 | << "Depth: " << data.mDepth << " (max: " << mTermMaxDepth << "), "
|
---|
| 1966 | << "PVS: " << data.mPvs << " (min: " << mTermMinPvs << "), "
|
---|
[587] | 1967 | << "Probability: " << data.mProbability << " (min: " << mTermMinProbability << "), "
|
---|
[463] | 1968 | << "#polygons: " << (int)data.mPolygons->size() << " (max: " << mTermMinPolys << "), "
|
---|
| 1969 | << "#rays: " << (int)data.mRays->size() << " (max: " << mTermMinRays << "), "
|
---|
| 1970 | << "#pvs: " << leaf->GetViewCell()->GetPvs().GetSize() << "=, "
|
---|
| 1971 | << "#avg ray contrib (pvs): " << (float)data.mPvs / (float)data.mRays->size() << endl;
|
---|
| 1972 | #endif
|
---|
| 1973 | }
|
---|
| 1974 |
|
---|
[466] | 1975 | int
|
---|
| 1976 | BspTree::_CastRay(Ray &ray)
|
---|
[463] | 1977 | {
|
---|
| 1978 | int hits = 0;
|
---|
| 1979 |
|
---|
| 1980 | stack<BspRayTraversalData> tStack;
|
---|
| 1981 |
|
---|
| 1982 | float maxt, mint;
|
---|
| 1983 |
|
---|
| 1984 | if (!mBox.GetRaySegment(ray, mint, maxt))
|
---|
| 1985 | return 0;
|
---|
| 1986 |
|
---|
[611] | 1987 | ViewCell::NewMail();
|
---|
[463] | 1988 |
|
---|
| 1989 | Vector3 entp = ray.Extrap(mint);
|
---|
| 1990 | Vector3 extp = ray.Extrap(maxt);
|
---|
| 1991 |
|
---|
| 1992 | BspNode *node = mRoot;
|
---|
| 1993 | BspNode *farChild = NULL;
|
---|
| 1994 |
|
---|
| 1995 | while (1)
|
---|
| 1996 | {
|
---|
| 1997 | if (!node->IsLeaf())
|
---|
| 1998 | {
|
---|
| 1999 | BspInterior *in = dynamic_cast<BspInterior *>(node);
|
---|
| 2000 |
|
---|
| 2001 | Plane3 splitPlane = in->GetPlane();
|
---|
| 2002 | const int entSide = splitPlane.Side(entp);
|
---|
| 2003 | const int extSide = splitPlane.Side(extp);
|
---|
| 2004 |
|
---|
| 2005 | if (entSide < 0)
|
---|
| 2006 | {
|
---|
| 2007 | node = in->GetBack();
|
---|
| 2008 |
|
---|
| 2009 | if(extSide <= 0) // plane does not split ray => no far child
|
---|
| 2010 | continue;
|
---|
| 2011 |
|
---|
| 2012 | farChild = in->GetFront(); // plane splits ray
|
---|
| 2013 |
|
---|
| 2014 | } else if (entSide > 0)
|
---|
| 2015 | {
|
---|
| 2016 | node = in->GetFront();
|
---|
| 2017 |
|
---|
| 2018 | if (extSide >= 0) // plane does not split ray => no far child
|
---|
| 2019 | continue;
|
---|
| 2020 |
|
---|
| 2021 | farChild = in->GetBack(); // plane splits ray
|
---|
| 2022 | }
|
---|
| 2023 | else // ray and plane are coincident
|
---|
| 2024 | {
|
---|
| 2025 | // WHAT TO DO IN THIS CASE ?
|
---|
| 2026 | //break;
|
---|
| 2027 | node = in->GetFront();
|
---|
| 2028 | continue;
|
---|
| 2029 | }
|
---|
| 2030 |
|
---|
| 2031 | // push data for far child
|
---|
| 2032 | tStack.push(BspRayTraversalData(farChild, extp, maxt));
|
---|
| 2033 |
|
---|
| 2034 | // find intersection of ray segment with plane
|
---|
| 2035 | float t;
|
---|
| 2036 | extp = splitPlane.FindIntersection(ray.GetLoc(), extp, &t);
|
---|
| 2037 | maxt *= t;
|
---|
| 2038 |
|
---|
| 2039 | } else // reached leaf => intersection with view cell
|
---|
| 2040 | {
|
---|
| 2041 | BspLeaf *leaf = dynamic_cast<BspLeaf *>(node);
|
---|
| 2042 |
|
---|
| 2043 | if (!leaf->mViewCell->Mailed())
|
---|
| 2044 | {
|
---|
[645] | 2045 | //ray.bspIntersections.push_back(Ray::BspIntersection(maxt, leaf));
|
---|
[463] | 2046 | leaf->mViewCell->Mail();
|
---|
| 2047 | ++ hits;
|
---|
| 2048 | }
|
---|
| 2049 |
|
---|
| 2050 | //-- fetch the next far child from the stack
|
---|
| 2051 | if (tStack.empty())
|
---|
| 2052 | break;
|
---|
| 2053 |
|
---|
| 2054 | entp = extp;
|
---|
| 2055 | mint = maxt; // NOTE: need this?
|
---|
| 2056 |
|
---|
| 2057 | if (ray.GetType() == Ray::LINE_SEGMENT && mint > 1.0f)
|
---|
| 2058 | break;
|
---|
| 2059 |
|
---|
| 2060 | BspRayTraversalData &s = tStack.top();
|
---|
| 2061 |
|
---|
| 2062 | node = s.mNode;
|
---|
| 2063 | extp = s.mExitPoint;
|
---|
| 2064 | maxt = s.mMaxT;
|
---|
| 2065 |
|
---|
| 2066 | tStack.pop();
|
---|
| 2067 | }
|
---|
| 2068 | }
|
---|
| 2069 |
|
---|
| 2070 | return hits;
|
---|
| 2071 | }
|
---|
| 2072 |
|
---|
[466] | 2073 |
|
---|
[468] | 2074 | int BspTree::CastLineSegment(const Vector3 &origin,
|
---|
| 2075 | const Vector3 &termination,
|
---|
| 2076 | vector<ViewCell *> &viewcells)
|
---|
[466] | 2077 | {
|
---|
[483] | 2078 | int hits = 0;
|
---|
| 2079 | stack<BspRayTraversalData> tStack;
|
---|
| 2080 |
|
---|
| 2081 | float mint = 0.0f, maxt = 1.0f;
|
---|
| 2082 |
|
---|
| 2083 | Intersectable::NewMail();
|
---|
[600] | 2084 | ViewCell::NewMail();
|
---|
[483] | 2085 |
|
---|
| 2086 | Vector3 entp = origin;
|
---|
| 2087 | Vector3 extp = termination;
|
---|
| 2088 |
|
---|
| 2089 | BspNode *node = mRoot;
|
---|
| 2090 | BspNode *farChild = NULL;
|
---|
| 2091 |
|
---|
[666] | 2092 | const float thresh = 1 ? 1e-6f : 0.0f;
|
---|
| 2093 |
|
---|
[483] | 2094 | while (1)
|
---|
| 2095 | {
|
---|
| 2096 | if (!node->IsLeaf())
|
---|
| 2097 | {
|
---|
| 2098 | BspInterior *in = dynamic_cast<BspInterior *>(node);
|
---|
[466] | 2099 |
|
---|
[483] | 2100 | Plane3 splitPlane = in->GetPlane();
|
---|
| 2101 |
|
---|
[666] | 2102 | const int entSide = splitPlane.Side(entp, thresh);
|
---|
| 2103 | const int extSide = splitPlane.Side(extp, thresh);
|
---|
[483] | 2104 |
|
---|
| 2105 | if (entSide < 0)
|
---|
| 2106 | {
|
---|
| 2107 | node = in->GetBack();
|
---|
[466] | 2108 |
|
---|
[483] | 2109 | if(extSide <= 0) // plane does not split ray => no far child
|
---|
| 2110 | continue;
|
---|
[466] | 2111 |
|
---|
[483] | 2112 | farChild = in->GetFront(); // plane splits ray
|
---|
| 2113 |
|
---|
| 2114 | }
|
---|
| 2115 | else if (entSide > 0)
|
---|
| 2116 | {
|
---|
| 2117 | node = in->GetFront();
|
---|
| 2118 |
|
---|
| 2119 | if (extSide >= 0) // plane does not split ray => no far child
|
---|
| 2120 | continue;
|
---|
| 2121 |
|
---|
| 2122 | farChild = in->GetBack(); // plane splits ray
|
---|
| 2123 | }
|
---|
| 2124 | else // ray and plane are coincident
|
---|
| 2125 | {
|
---|
[645] | 2126 | // NOTE: what to do if ray is coincident with plane?
|
---|
| 2127 | if (extSide < 0)
|
---|
| 2128 | node = in->GetBack();
|
---|
[694] | 2129 | else //if (extSide > 0)
|
---|
[645] | 2130 | node = in->GetFront();
|
---|
[694] | 2131 | //else break;
|
---|
| 2132 |
|
---|
[645] | 2133 | continue; // no far child
|
---|
[483] | 2134 | }
|
---|
| 2135 |
|
---|
| 2136 | // push data for far child
|
---|
| 2137 | tStack.push(BspRayTraversalData(farChild, extp, maxt));
|
---|
| 2138 |
|
---|
| 2139 | // find intersection of ray segment with plane
|
---|
| 2140 | float t;
|
---|
| 2141 | extp = splitPlane.FindIntersection(origin, extp, &t);
|
---|
| 2142 | maxt *= t;
|
---|
| 2143 | }
|
---|
| 2144 | else
|
---|
| 2145 | {
|
---|
| 2146 | // reached leaf => intersection with view cell
|
---|
| 2147 | BspLeaf *leaf = dynamic_cast<BspLeaf *>(node);
|
---|
| 2148 |
|
---|
| 2149 | if (!leaf->mViewCell->Mailed())
|
---|
| 2150 | {
|
---|
| 2151 | viewcells.push_back(leaf->mViewCell);
|
---|
| 2152 | leaf->mViewCell->Mail();
|
---|
| 2153 | hits++;
|
---|
| 2154 | }
|
---|
| 2155 |
|
---|
| 2156 | //-- fetch the next far child from the stack
|
---|
| 2157 | if (tStack.empty())
|
---|
| 2158 | break;
|
---|
| 2159 |
|
---|
| 2160 | entp = extp;
|
---|
| 2161 | mint = maxt; // NOTE: need this?
|
---|
| 2162 |
|
---|
| 2163 | BspRayTraversalData &s = tStack.top();
|
---|
| 2164 |
|
---|
| 2165 | node = s.mNode;
|
---|
| 2166 | extp = s.mExitPoint;
|
---|
| 2167 | maxt = s.mMaxT;
|
---|
| 2168 |
|
---|
| 2169 | tStack.pop();
|
---|
[466] | 2170 | }
|
---|
| 2171 | }
|
---|
[483] | 2172 | return hits;
|
---|
[466] | 2173 | }
|
---|
| 2174 |
|
---|
[463] | 2175 |
|
---|
| 2176 | void BspTree::CollectViewCells(ViewCellContainer &viewCells) const
|
---|
| 2177 | {
|
---|
| 2178 | stack<BspNode *> nodeStack;
|
---|
| 2179 | nodeStack.push(mRoot);
|
---|
| 2180 |
|
---|
| 2181 | ViewCell::NewMail();
|
---|
| 2182 |
|
---|
| 2183 | while (!nodeStack.empty())
|
---|
| 2184 | {
|
---|
| 2185 | BspNode *node = nodeStack.top();
|
---|
| 2186 | nodeStack.pop();
|
---|
| 2187 |
|
---|
| 2188 | if (node->IsLeaf())
|
---|
| 2189 | {
|
---|
| 2190 | ViewCell *viewCell = dynamic_cast<BspLeaf *>(node)->mViewCell;
|
---|
| 2191 |
|
---|
| 2192 | if (!viewCell->Mailed())
|
---|
| 2193 | {
|
---|
| 2194 | viewCell->Mail();
|
---|
| 2195 | viewCells.push_back(viewCell);
|
---|
| 2196 | }
|
---|
| 2197 | }
|
---|
| 2198 | else
|
---|
| 2199 | {
|
---|
| 2200 | BspInterior *interior = dynamic_cast<BspInterior *>(node);
|
---|
| 2201 |
|
---|
| 2202 | nodeStack.push(interior->GetFront());
|
---|
| 2203 | nodeStack.push(interior->GetBack());
|
---|
| 2204 | }
|
---|
| 2205 | }
|
---|
| 2206 | }
|
---|
| 2207 |
|
---|
| 2208 |
|
---|
| 2209 | BspTreeStatistics &BspTree::GetStat()
|
---|
| 2210 | {
|
---|
| 2211 | return mStat;
|
---|
| 2212 | }
|
---|
| 2213 |
|
---|
[479] | 2214 |
|
---|
[463] | 2215 | float BspTree::AccumulatedRayLength(BoundedRayContainer &rays) const
|
---|
| 2216 | {
|
---|
| 2217 | float len = 0;
|
---|
| 2218 |
|
---|
| 2219 | BoundedRayContainer::const_iterator it, it_end = rays.end();
|
---|
| 2220 |
|
---|
| 2221 | for (it = rays.begin(); it != it_end; ++ it)
|
---|
| 2222 | {
|
---|
| 2223 | len += SqrDistance((*it)->mRay->Extrap((*it)->mMinT),
|
---|
| 2224 | (*it)->mRay->Extrap((*it)->mMaxT));
|
---|
| 2225 | }
|
---|
| 2226 |
|
---|
| 2227 | return len;
|
---|
| 2228 | }
|
---|
| 2229 |
|
---|
[479] | 2230 |
|
---|
[463] | 2231 | int BspTree::SplitRays(const Plane3 &plane,
|
---|
| 2232 | BoundedRayContainer &rays,
|
---|
| 2233 | BoundedRayContainer &frontRays,
|
---|
| 2234 | BoundedRayContainer &backRays)
|
---|
| 2235 | {
|
---|
| 2236 | int splits = 0;
|
---|
[473] | 2237 |
|
---|
[463] | 2238 | while (!rays.empty())
|
---|
| 2239 | {
|
---|
| 2240 | BoundedRay *bRay = rays.back();
|
---|
| 2241 | Ray *ray = bRay->mRay;
|
---|
| 2242 | float minT = bRay->mMinT;
|
---|
| 2243 | float maxT = bRay->mMaxT;
|
---|
| 2244 |
|
---|
| 2245 | rays.pop_back();
|
---|
| 2246 |
|
---|
| 2247 | Vector3 entP, extP;
|
---|
| 2248 |
|
---|
| 2249 | const int cf =
|
---|
| 2250 | ray->ClassifyPlane(plane, minT, maxT, entP, extP);
|
---|
| 2251 |
|
---|
| 2252 | // set id to ray classification
|
---|
| 2253 | ray->SetId(cf);
|
---|
| 2254 |
|
---|
| 2255 | switch (cf)
|
---|
| 2256 | {
|
---|
| 2257 | case Ray::COINCIDENT: // TODO: should really discard ray?
|
---|
| 2258 | frontRays.push_back(bRay);
|
---|
| 2259 | //DEL_PTR(bRay);
|
---|
| 2260 | break;
|
---|
| 2261 | case Ray::BACK:
|
---|
| 2262 | backRays.push_back(bRay);
|
---|
| 2263 | break;
|
---|
| 2264 | case Ray::FRONT:
|
---|
| 2265 | frontRays.push_back(bRay);
|
---|
| 2266 | break;
|
---|
| 2267 | case Ray::FRONT_BACK:
|
---|
| 2268 | {
|
---|
| 2269 | // find intersection of ray segment with plane
|
---|
| 2270 | const float t = plane.FindT(ray->GetLoc(), extP);
|
---|
| 2271 |
|
---|
| 2272 | const float newT = t * maxT;
|
---|
| 2273 |
|
---|
| 2274 | frontRays.push_back(new BoundedRay(ray, minT, newT));
|
---|
| 2275 | backRays.push_back(new BoundedRay(ray, newT, maxT));
|
---|
| 2276 |
|
---|
| 2277 | DEL_PTR(bRay);
|
---|
| 2278 | }
|
---|
| 2279 | break;
|
---|
| 2280 | case Ray::BACK_FRONT:
|
---|
| 2281 | {
|
---|
| 2282 | // find intersection of ray segment with plane
|
---|
| 2283 | const float t = plane.FindT(ray->GetLoc(), extP);
|
---|
| 2284 | const float newT = t * bRay->mMaxT;
|
---|
| 2285 |
|
---|
| 2286 | backRays.push_back(new BoundedRay(ray, minT, newT));
|
---|
| 2287 | frontRays.push_back(new BoundedRay(ray, newT, maxT));
|
---|
| 2288 |
|
---|
| 2289 | DEL_PTR(bRay);
|
---|
| 2290 |
|
---|
| 2291 | ++ splits;
|
---|
| 2292 | }
|
---|
| 2293 | break;
|
---|
| 2294 | default:
|
---|
| 2295 | Debug << "Should not come here 4" << endl;
|
---|
| 2296 | break;
|
---|
| 2297 | }
|
---|
| 2298 | }
|
---|
| 2299 |
|
---|
| 2300 | return splits;
|
---|
| 2301 | }
|
---|
| 2302 |
|
---|
| 2303 | void BspTree::ExtractHalfSpaces(BspNode *n, vector<Plane3> &halfSpaces) const
|
---|
| 2304 | {
|
---|
| 2305 | BspNode *lastNode;
|
---|
[678] | 2306 |
|
---|
[463] | 2307 | do
|
---|
| 2308 | {
|
---|
| 2309 | lastNode = n;
|
---|
| 2310 |
|
---|
| 2311 | // want to get planes defining geometry of this node => don't take
|
---|
| 2312 | // split plane of node itself
|
---|
| 2313 | n = n->GetParent();
|
---|
| 2314 |
|
---|
| 2315 | if (n)
|
---|
| 2316 | {
|
---|
| 2317 | BspInterior *interior = dynamic_cast<BspInterior *>(n);
|
---|
| 2318 | Plane3 halfSpace = dynamic_cast<BspInterior *>(interior)->GetPlane();
|
---|
| 2319 |
|
---|
[683] | 2320 | if (interior->GetBack() != lastNode)
|
---|
[463] | 2321 | halfSpace.ReverseOrientation();
|
---|
| 2322 |
|
---|
| 2323 | halfSpaces.push_back(halfSpace);
|
---|
| 2324 | }
|
---|
| 2325 | }
|
---|
| 2326 | while (n);
|
---|
| 2327 | }
|
---|
| 2328 |
|
---|
| 2329 |
|
---|
| 2330 |
|
---|
[587] | 2331 | void BspTree::ConstructGeometry(ViewCell *vc,
|
---|
| 2332 | BspNodeGeometry &vcGeom) const
|
---|
[589] | 2333 | {
|
---|
[587] | 2334 | ViewCellContainer leaves;
|
---|
[600] | 2335 | mViewCellsTree->CollectLeaves(vc, leaves);
|
---|
[587] | 2336 |
|
---|
| 2337 | ViewCellContainer::const_iterator it, it_end = leaves.end();
|
---|
| 2338 |
|
---|
[463] | 2339 | for (it = leaves.begin(); it != it_end; ++ it)
|
---|
[587] | 2340 | {
|
---|
| 2341 | BspLeaf *l = dynamic_cast<BspViewCell *>(*it)->mLeaf;
|
---|
| 2342 | ConstructGeometry(l, vcGeom);
|
---|
| 2343 | }
|
---|
[463] | 2344 | }
|
---|
| 2345 |
|
---|
| 2346 |
|
---|
[683] | 2347 | void BspTree::ConstructGeometry(BspNode *n,
|
---|
| 2348 | BspNodeGeometry &geom) const
|
---|
[587] | 2349 | {
|
---|
[463] | 2350 | vector<Plane3> halfSpaces;
|
---|
| 2351 | ExtractHalfSpaces(n, halfSpaces);
|
---|
| 2352 |
|
---|
[683] | 2353 | PolygonContainer candidatePolys;
|
---|
[678] | 2354 | vector<Plane3> candidatePlanes;
|
---|
[463] | 2355 |
|
---|
[683] | 2356 | // bounded planes are added to the polygons
|
---|
[463] | 2357 | for (int i = 0; i < (int)halfSpaces.size(); ++ i)
|
---|
| 2358 | {
|
---|
| 2359 | Polygon3 *p = GetBoundingBox().CrossSection(halfSpaces[i]);
|
---|
[683] | 2360 |
|
---|
[463] | 2361 | if (p->Valid(mEpsilon))
|
---|
| 2362 | {
|
---|
[683] | 2363 | candidatePolys.push_back(p);
|
---|
| 2364 | candidatePlanes.push_back(halfSpaces[i]);
|
---|
[463] | 2365 | }
|
---|
| 2366 | }
|
---|
| 2367 |
|
---|
| 2368 | // add faces of bounding box (also could be faces of the cell)
|
---|
| 2369 | for (int i = 0; i < 6; ++ i)
|
---|
| 2370 | {
|
---|
| 2371 | VertexContainer vertices;
|
---|
[683] | 2372 |
|
---|
[463] | 2373 | for (int j = 0; j < 4; ++ j)
|
---|
| 2374 | vertices.push_back(mBox.GetFace(i).mVertices[j]);
|
---|
| 2375 |
|
---|
[678] | 2376 | Polygon3 *poly = new Polygon3(vertices);
|
---|
[683] | 2377 |
|
---|
| 2378 | candidatePolys.push_back(poly);
|
---|
[678] | 2379 | candidatePlanes.push_back(poly->GetSupportingPlane());
|
---|
[463] | 2380 | }
|
---|
| 2381 |
|
---|
[683] | 2382 | for (int i = 0; i < (int)candidatePolys.size(); ++ i)
|
---|
[463] | 2383 | {
|
---|
| 2384 | // polygon is split by all other planes
|
---|
[683] | 2385 | for (int j = 0; (j < (int)halfSpaces.size()) && candidatePolys[i]; ++ j)
|
---|
[463] | 2386 | {
|
---|
| 2387 | if (i == j) // polygon and plane are coincident
|
---|
| 2388 | continue;
|
---|
| 2389 |
|
---|
| 2390 | VertexContainer splitPts;
|
---|
| 2391 | Polygon3 *frontPoly, *backPoly;
|
---|
| 2392 |
|
---|
[683] | 2393 | const int cf =
|
---|
| 2394 | candidatePolys[i]->ClassifyPlane(halfSpaces[j],
|
---|
| 2395 | mEpsilon);
|
---|
| 2396 |
|
---|
[463] | 2397 | switch (cf)
|
---|
| 2398 | {
|
---|
| 2399 | case Polygon3::SPLIT:
|
---|
| 2400 | frontPoly = new Polygon3();
|
---|
| 2401 | backPoly = new Polygon3();
|
---|
| 2402 |
|
---|
[683] | 2403 | candidatePolys[i]->Split(halfSpaces[j],
|
---|
| 2404 | *frontPoly,
|
---|
| 2405 | *backPoly,
|
---|
| 2406 | mEpsilon);
|
---|
[463] | 2407 |
|
---|
[683] | 2408 | DEL_PTR(candidatePolys[i]);
|
---|
[463] | 2409 |
|
---|
| 2410 | if (frontPoly->Valid(mEpsilon))
|
---|
[683] | 2411 | candidatePolys[i] = frontPoly;
|
---|
[463] | 2412 | else
|
---|
| 2413 | DEL_PTR(frontPoly);
|
---|
| 2414 |
|
---|
| 2415 | DEL_PTR(backPoly);
|
---|
| 2416 | break;
|
---|
[683] | 2417 | // polygon outside of halfspace
|
---|
| 2418 | case Polygon3::FRONT_SIDE:
|
---|
| 2419 | DEL_PTR(candidatePolys[i]);
|
---|
[463] | 2420 | break;
|
---|
| 2421 | // just take polygon as it is
|
---|
[683] | 2422 | case Polygon3::BACK_SIDE:
|
---|
[463] | 2423 | case Polygon3::COINCIDENT:
|
---|
| 2424 | default:
|
---|
| 2425 | break;
|
---|
| 2426 | }
|
---|
| 2427 | }
|
---|
[683] | 2428 |
|
---|
| 2429 | if (candidatePolys[i])
|
---|
[678] | 2430 | {
|
---|
[683] | 2431 | geom.Add(candidatePolys[i], candidatePlanes[i]);
|
---|
| 2432 | // geom.mPolys.push_back(candidates[i]);
|
---|
[678] | 2433 | }
|
---|
[463] | 2434 | }
|
---|
| 2435 | }
|
---|
| 2436 |
|
---|
| 2437 |
|
---|
[683] | 2438 | void BspTree::SetViewCellsManager(ViewCellsManager *vcm)
|
---|
| 2439 | {
|
---|
| 2440 | mViewCellsManager = vcm;
|
---|
| 2441 | }
|
---|
| 2442 |
|
---|
| 2443 |
|
---|
[587] | 2444 | typedef pair<BspNode *, BspNodeGeometry *> bspNodePair;
|
---|
| 2445 |
|
---|
| 2446 |
|
---|
[683] | 2447 | int BspTree::FindNeighbors(BspNode *n, vector<BspLeaf *>
|
---|
| 2448 | &neighbors,
|
---|
[463] | 2449 | const bool onlyUnmailed) const
|
---|
| 2450 | {
|
---|
[587] | 2451 | stack<bspNodePair> nodeStack;
|
---|
| 2452 |
|
---|
| 2453 | BspNodeGeometry nodeGeom;
|
---|
| 2454 | ConstructGeometry(n, nodeGeom);
|
---|
| 2455 |
|
---|
| 2456 | // split planes from the root to this node
|
---|
| 2457 | // needed to verify that we found neighbor leaf
|
---|
| 2458 | // TODO: really needed?
|
---|
[463] | 2459 | vector<Plane3> halfSpaces;
|
---|
| 2460 | ExtractHalfSpaces(n, halfSpaces);
|
---|
| 2461 |
|
---|
[587] | 2462 |
|
---|
| 2463 | BspNodeGeometry *rgeom = new BspNodeGeometry();
|
---|
| 2464 | ConstructGeometry(mRoot, *rgeom);
|
---|
| 2465 |
|
---|
| 2466 | nodeStack.push(bspNodePair(mRoot, rgeom));
|
---|
| 2467 |
|
---|
| 2468 | while (!nodeStack.empty())
|
---|
[463] | 2469 | {
|
---|
[587] | 2470 | BspNode *node = nodeStack.top().first;
|
---|
| 2471 | BspNodeGeometry *geom = nodeStack.top().second;
|
---|
| 2472 |
|
---|
[463] | 2473 | nodeStack.pop();
|
---|
| 2474 |
|
---|
| 2475 | if (node->IsLeaf())
|
---|
| 2476 | {
|
---|
[587] | 2477 | // test if this leaf is in valid view space
|
---|
| 2478 | if (node->TreeValid() &&
|
---|
| 2479 | (node != n) &&
|
---|
| 2480 | (!onlyUnmailed || !node->Mailed()))
|
---|
[463] | 2481 | {
|
---|
| 2482 | bool isAdjacent = true;
|
---|
[587] | 2483 |
|
---|
| 2484 | if (1)
|
---|
[463] | 2485 | {
|
---|
[587] | 2486 | // test all planes of current node if still adjacent
|
---|
| 2487 | for (int i = 0; (i < halfSpaces.size()) && isAdjacent; ++ i)
|
---|
| 2488 | {
|
---|
| 2489 | const int cf =
|
---|
[678] | 2490 | Polygon3::ClassifyPlane(geom->GetPolys(),
|
---|
[587] | 2491 | halfSpaces[i],
|
---|
| 2492 | mEpsilon);
|
---|
[463] | 2493 |
|
---|
[683] | 2494 | if (cf == Polygon3::FRONT_SIDE)
|
---|
[587] | 2495 | {
|
---|
| 2496 | isAdjacent = false;
|
---|
| 2497 | }
|
---|
| 2498 | }
|
---|
[463] | 2499 | }
|
---|
[587] | 2500 | else
|
---|
| 2501 | {
|
---|
| 2502 | // TODO: why is this wrong??
|
---|
| 2503 | // test all planes of current node if still adjacent
|
---|
[678] | 2504 | for (int i = 0; (i < nodeGeom.Size()) && isAdjacent; ++ i)
|
---|
[587] | 2505 | {
|
---|
[678] | 2506 | Polygon3 *poly = nodeGeom.GetPolys()[i];
|
---|
[463] | 2507 |
|
---|
[587] | 2508 | const int cf =
|
---|
[678] | 2509 | Polygon3::ClassifyPlane(geom->GetPolys(),
|
---|
[587] | 2510 | poly->GetSupportingPlane(),
|
---|
| 2511 | mEpsilon);
|
---|
| 2512 |
|
---|
[683] | 2513 | if (cf == Polygon3::FRONT_SIDE)
|
---|
[587] | 2514 | {
|
---|
| 2515 | isAdjacent = false;
|
---|
| 2516 | }
|
---|
| 2517 | }
|
---|
| 2518 | }
|
---|
| 2519 | // neighbor was found
|
---|
[463] | 2520 | if (isAdjacent)
|
---|
[587] | 2521 | {
|
---|
[463] | 2522 | neighbors.push_back(dynamic_cast<BspLeaf *>(node));
|
---|
[587] | 2523 | }
|
---|
[463] | 2524 | }
|
---|
| 2525 | }
|
---|
[587] | 2526 | else
|
---|
[463] | 2527 | {
|
---|
| 2528 | BspInterior *interior = dynamic_cast<BspInterior *>(node);
|
---|
[587] | 2529 |
|
---|
[678] | 2530 | const int cf = Polygon3::ClassifyPlane(nodeGeom.GetPolys(),
|
---|
[587] | 2531 | interior->GetPlane(),
|
---|
[463] | 2532 | mEpsilon);
|
---|
[587] | 2533 |
|
---|
| 2534 | BspNode *front = interior->GetFront();
|
---|
| 2535 | BspNode *back = interior->GetBack();
|
---|
| 2536 |
|
---|
| 2537 | BspNodeGeometry *fGeom = new BspNodeGeometry();
|
---|
| 2538 | BspNodeGeometry *bGeom = new BspNodeGeometry();
|
---|
[463] | 2539 |
|
---|
[587] | 2540 | geom->SplitGeometry(*fGeom,
|
---|
| 2541 | *bGeom,
|
---|
| 2542 | interior->GetPlane(),
|
---|
| 2543 | mBox,
|
---|
[683] | 2544 | //0.0000001f);
|
---|
[587] | 2545 | mEpsilon);
|
---|
| 2546 |
|
---|
[683] | 2547 | if (cf == Polygon3::BACK_SIDE)
|
---|
[587] | 2548 | {
|
---|
[683] | 2549 | nodeStack.push(bspNodePair(interior->GetBack(), bGeom));
|
---|
| 2550 | DEL_PTR(fGeom);
|
---|
[587] | 2551 | }
|
---|
[463] | 2552 | else
|
---|
[587] | 2553 | {
|
---|
[683] | 2554 | if (cf == Polygon3::FRONT_SIDE)
|
---|
[463] | 2555 | {
|
---|
[683] | 2556 | nodeStack.push(bspNodePair(interior->GetFront(), fGeom));
|
---|
| 2557 | DEL_PTR(bGeom);
|
---|
[463] | 2558 | }
|
---|
[587] | 2559 | else
|
---|
| 2560 | { // random decision
|
---|
| 2561 | nodeStack.push(bspNodePair(front, fGeom));
|
---|
| 2562 | nodeStack.push(bspNodePair(back, bGeom));
|
---|
| 2563 | }
|
---|
| 2564 | }
|
---|
[463] | 2565 | }
|
---|
[587] | 2566 |
|
---|
| 2567 | DEL_PTR(geom);
|
---|
[463] | 2568 | }
|
---|
[587] | 2569 |
|
---|
[463] | 2570 | return (int)neighbors.size();
|
---|
| 2571 | }
|
---|
| 2572 |
|
---|
[503] | 2573 |
|
---|
[463] | 2574 | BspLeaf *BspTree::GetRandomLeaf(const bool onlyUnmailed)
|
---|
| 2575 | {
|
---|
| 2576 | stack<BspNode *> nodeStack;
|
---|
| 2577 |
|
---|
| 2578 | nodeStack.push(mRoot);
|
---|
| 2579 |
|
---|
| 2580 | int mask = rand();
|
---|
| 2581 |
|
---|
| 2582 | while (!nodeStack.empty())
|
---|
| 2583 | {
|
---|
| 2584 | BspNode *node = nodeStack.top();
|
---|
| 2585 | nodeStack.pop();
|
---|
| 2586 |
|
---|
| 2587 | if (node->IsLeaf())
|
---|
| 2588 | {
|
---|
| 2589 | if ( (!onlyUnmailed || !node->Mailed()) )
|
---|
| 2590 | return dynamic_cast<BspLeaf *>(node);
|
---|
| 2591 | }
|
---|
| 2592 | else
|
---|
| 2593 | {
|
---|
| 2594 | BspInterior *interior = dynamic_cast<BspInterior *>(node);
|
---|
| 2595 |
|
---|
| 2596 | // random decision
|
---|
| 2597 | if (mask & 1)
|
---|
| 2598 | nodeStack.push(interior->GetBack());
|
---|
| 2599 | else
|
---|
| 2600 | nodeStack.push(interior->GetFront());
|
---|
| 2601 |
|
---|
| 2602 | mask = mask >> 1;
|
---|
| 2603 | }
|
---|
| 2604 | }
|
---|
| 2605 |
|
---|
| 2606 | return NULL;
|
---|
| 2607 | }
|
---|
| 2608 |
|
---|
[587] | 2609 |
|
---|
[463] | 2610 | void BspTree::AddToPvs(BspLeaf *leaf,
|
---|
| 2611 | const BoundedRayContainer &rays,
|
---|
| 2612 | int &sampleContributions,
|
---|
| 2613 | int &contributingSamples)
|
---|
| 2614 | {
|
---|
| 2615 | sampleContributions = 0;
|
---|
| 2616 | contributingSamples = 0;
|
---|
| 2617 |
|
---|
| 2618 | BoundedRayContainer::const_iterator it, it_end = rays.end();
|
---|
| 2619 |
|
---|
| 2620 | ViewCell *vc = leaf->GetViewCell();
|
---|
| 2621 |
|
---|
| 2622 | // add contributions from samples to the PVS
|
---|
| 2623 | for (it = rays.begin(); it != it_end; ++ it)
|
---|
| 2624 | {
|
---|
| 2625 | int contribution = 0;
|
---|
| 2626 | Ray *ray = (*it)->mRay;
|
---|
[466] | 2627 | float relContribution;
|
---|
[463] | 2628 | if (!ray->intersections.empty())
|
---|
[556] | 2629 | contribution += vc->GetPvs().AddSample(ray->intersections[0].mObject,
|
---|
| 2630 | 1.0f,
|
---|
| 2631 | relContribution);
|
---|
[463] | 2632 |
|
---|
| 2633 | if (ray->sourceObject.mObject)
|
---|
[556] | 2634 | contribution += vc->GetPvs().AddSample(ray->sourceObject.mObject,
|
---|
| 2635 | 1.0f,
|
---|
| 2636 | relContribution);
|
---|
| 2637 |
|
---|
[463] | 2638 | if (contribution)
|
---|
| 2639 | {
|
---|
| 2640 | sampleContributions += contribution;
|
---|
| 2641 | ++ contributingSamples;
|
---|
| 2642 | }
|
---|
| 2643 |
|
---|
| 2644 | //if (ray->mFlags & Ray::STORE_BSP_INTERSECTIONS)
|
---|
| 2645 | // ray->bspIntersections.push_back(Ray::BspIntersection((*it)->mMinT, this));
|
---|
| 2646 | }
|
---|
| 2647 | }
|
---|
| 2648 |
|
---|
[587] | 2649 |
|
---|
[463] | 2650 | int BspTree::ComputePvsSize(const BoundedRayContainer &rays) const
|
---|
| 2651 | {
|
---|
| 2652 | int pvsSize = 0;
|
---|
| 2653 |
|
---|
| 2654 | BoundedRayContainer::const_iterator rit, rit_end = rays.end();
|
---|
| 2655 |
|
---|
| 2656 | Intersectable::NewMail();
|
---|
| 2657 |
|
---|
| 2658 | for (rit = rays.begin(); rit != rays.end(); ++ rit)
|
---|
| 2659 | {
|
---|
| 2660 | Ray *ray = (*rit)->mRay;
|
---|
| 2661 |
|
---|
| 2662 | if (!ray->intersections.empty())
|
---|
| 2663 | {
|
---|
| 2664 | if (!ray->intersections[0].mObject->Mailed())
|
---|
| 2665 | {
|
---|
| 2666 | ray->intersections[0].mObject->Mail();
|
---|
| 2667 | ++ pvsSize;
|
---|
| 2668 | }
|
---|
| 2669 | }
|
---|
| 2670 | if (ray->sourceObject.mObject)
|
---|
| 2671 | {
|
---|
| 2672 | if (!ray->sourceObject.mObject->Mailed())
|
---|
| 2673 | {
|
---|
| 2674 | ray->sourceObject.mObject->Mail();
|
---|
| 2675 | ++ pvsSize;
|
---|
| 2676 | }
|
---|
| 2677 | }
|
---|
| 2678 | }
|
---|
| 2679 |
|
---|
| 2680 | return pvsSize;
|
---|
| 2681 | }
|
---|
| 2682 |
|
---|
[587] | 2683 |
|
---|
[463] | 2684 | float BspTree::GetEpsilon() const
|
---|
| 2685 | {
|
---|
| 2686 | return mEpsilon;
|
---|
| 2687 | }
|
---|
| 2688 |
|
---|
| 2689 |
|
---|
[587] | 2690 | int BspTree::CollectMergeCandidates(const vector<BspLeaf *> leaves,
|
---|
| 2691 | vector<MergeCandidate> &candidates)
|
---|
| 2692 | {
|
---|
| 2693 | BspLeaf::NewMail();
|
---|
| 2694 |
|
---|
| 2695 | vector<BspLeaf *>::const_iterator it, it_end = leaves.end();
|
---|
[463] | 2696 |
|
---|
[587] | 2697 | int numCandidates = 0;
|
---|
[503] | 2698 |
|
---|
[587] | 2699 | // find merge candidates and push them into queue
|
---|
| 2700 | for (it = leaves.begin(); it != it_end; ++ it)
|
---|
| 2701 | {
|
---|
| 2702 | BspLeaf *leaf = *it;
|
---|
| 2703 |
|
---|
| 2704 | // the same leaves must not be part of two merge candidates
|
---|
| 2705 | leaf->Mail();
|
---|
| 2706 | vector<BspLeaf *> neighbors;
|
---|
| 2707 | FindNeighbors(leaf, neighbors, true);
|
---|
| 2708 |
|
---|
| 2709 | vector<BspLeaf *>::const_iterator nit, nit_end = neighbors.end();
|
---|
| 2710 |
|
---|
| 2711 | // TODO: test if at least one ray goes from one leaf to the other
|
---|
| 2712 | for (nit = neighbors.begin(); nit != nit_end; ++ nit)
|
---|
| 2713 | {
|
---|
| 2714 | if ((*nit)->GetViewCell() != leaf->GetViewCell())
|
---|
| 2715 | {
|
---|
| 2716 | MergeCandidate mc(leaf->GetViewCell(), (*nit)->GetViewCell());
|
---|
| 2717 | candidates.push_back(mc);
|
---|
| 2718 |
|
---|
| 2719 | ++ numCandidates;
|
---|
| 2720 | if ((numCandidates % 1000) == 0)
|
---|
| 2721 | {
|
---|
| 2722 | cout << "collected " << numCandidates << " merge candidates" << endl;
|
---|
| 2723 | }
|
---|
| 2724 | }
|
---|
| 2725 | }
|
---|
| 2726 | }
|
---|
| 2727 |
|
---|
| 2728 | Debug << "merge queue: " << (int)candidates.size() << endl;
|
---|
| 2729 | Debug << "leaves in queue: " << numCandidates << endl;
|
---|
| 2730 |
|
---|
| 2731 |
|
---|
| 2732 | return (int)leaves.size();
|
---|
| 2733 | }
|
---|
| 2734 |
|
---|
| 2735 |
|
---|
| 2736 | int BspTree::CollectMergeCandidates(const VssRayContainer &rays,
|
---|
| 2737 | vector<MergeCandidate> &candidates)
|
---|
| 2738 | {
|
---|
| 2739 | ViewCell::NewMail();
|
---|
| 2740 | long startTime = GetTime();
|
---|
| 2741 |
|
---|
| 2742 | map<BspLeaf *, vector<BspLeaf*> > neighborMap;
|
---|
| 2743 | ViewCellContainer::const_iterator iit;
|
---|
| 2744 |
|
---|
| 2745 | int numLeaves = 0;
|
---|
| 2746 |
|
---|
| 2747 | BspLeaf::NewMail();
|
---|
| 2748 |
|
---|
| 2749 | for (int i = 0; i < (int)rays.size(); ++ i)
|
---|
| 2750 | {
|
---|
| 2751 | VssRay *ray = rays[i];
|
---|
| 2752 |
|
---|
| 2753 | // traverse leaves stored in the rays and compare and
|
---|
| 2754 | // merge consecutive leaves (i.e., the neighbors in the tree)
|
---|
| 2755 | if (ray->mViewCells.size() < 2)
|
---|
| 2756 | continue;
|
---|
[590] | 2757 |
|
---|
[587] | 2758 | iit = ray->mViewCells.begin();
|
---|
| 2759 | BspViewCell *bspVc = dynamic_cast<BspViewCell *>(*(iit ++));
|
---|
| 2760 | BspLeaf *leaf = bspVc->mLeaf;
|
---|
| 2761 |
|
---|
| 2762 | // traverse intersections
|
---|
| 2763 | // consecutive leaves are neighbors => add them to queue
|
---|
| 2764 | for (; iit != ray->mViewCells.end(); ++ iit)
|
---|
| 2765 | {
|
---|
| 2766 | // next pair
|
---|
| 2767 | BspLeaf *prevLeaf = leaf;
|
---|
| 2768 | bspVc = dynamic_cast<BspViewCell *>(*iit);
|
---|
| 2769 | leaf = bspVc->mLeaf;
|
---|
| 2770 |
|
---|
| 2771 | // view space not valid or same view cell
|
---|
| 2772 | if (!leaf->TreeValid() || !prevLeaf->TreeValid() ||
|
---|
| 2773 | (leaf->GetViewCell() == prevLeaf->GetViewCell()))
|
---|
| 2774 | continue;
|
---|
| 2775 |
|
---|
| 2776 | vector<BspLeaf *> &neighbors = neighborMap[leaf];
|
---|
| 2777 |
|
---|
| 2778 | bool found = false;
|
---|
| 2779 |
|
---|
| 2780 | // both leaves inserted in queue already =>
|
---|
| 2781 | // look if double pair already exists
|
---|
| 2782 | if (leaf->Mailed() && prevLeaf->Mailed())
|
---|
| 2783 | {
|
---|
| 2784 | vector<BspLeaf *>::const_iterator it, it_end = neighbors.end();
|
---|
| 2785 |
|
---|
| 2786 | for (it = neighbors.begin(); !found && (it != it_end); ++ it)
|
---|
| 2787 | if (*it == prevLeaf)
|
---|
| 2788 | found = true; // already in queue
|
---|
| 2789 | }
|
---|
| 2790 |
|
---|
| 2791 | if (!found)
|
---|
| 2792 | {
|
---|
| 2793 | // this pair is not in map yet
|
---|
| 2794 | // => insert into the neighbor map and the queue
|
---|
| 2795 | neighbors.push_back(prevLeaf);
|
---|
| 2796 | neighborMap[prevLeaf].push_back(leaf);
|
---|
| 2797 |
|
---|
| 2798 | leaf->Mail();
|
---|
| 2799 | prevLeaf->Mail();
|
---|
| 2800 |
|
---|
| 2801 | MergeCandidate mc(leaf->GetViewCell(), prevLeaf->GetViewCell());
|
---|
| 2802 |
|
---|
| 2803 | candidates.push_back(mc);
|
---|
| 2804 |
|
---|
| 2805 | if (((int)candidates.size() % 1000) == 0)
|
---|
| 2806 | {
|
---|
| 2807 | cout << "collected " << (int)candidates.size() << " merge candidates" << endl;
|
---|
| 2808 | }
|
---|
| 2809 | }
|
---|
| 2810 | }
|
---|
| 2811 | }
|
---|
| 2812 |
|
---|
| 2813 | Debug << "neighbormap size: " << (int)neighborMap.size() << endl;
|
---|
| 2814 | Debug << "merge queue: " << (int)candidates.size() << endl;
|
---|
| 2815 | Debug << "leaves in queue: " << numLeaves << endl;
|
---|
| 2816 |
|
---|
| 2817 |
|
---|
| 2818 | //-- collect the leaves which haven't been found by ray casting
|
---|
| 2819 | #if 0
|
---|
| 2820 | cout << "finding additional merge candidates using geometry" << endl;
|
---|
| 2821 | vector<BspLeaf *> leaves;
|
---|
| 2822 | CollectLeaves(leaves, true);
|
---|
| 2823 | Debug << "found " << (int)leaves.size() << " new leaves" << endl << endl;
|
---|
| 2824 | CollectMergeCandidates(leaves, candidates);
|
---|
| 2825 | #endif
|
---|
| 2826 |
|
---|
| 2827 | return numLeaves;
|
---|
| 2828 | }
|
---|
| 2829 |
|
---|
| 2830 |
|
---|
| 2831 |
|
---|
| 2832 |
|
---|
| 2833 | /***************************************************************/
|
---|
| 2834 | /* BspNodeGeometry Implementation */
|
---|
| 2835 | /***************************************************************/
|
---|
| 2836 |
|
---|
| 2837 |
|
---|
[508] | 2838 | BspNodeGeometry::BspNodeGeometry(const BspNodeGeometry &rhs)
|
---|
| 2839 | {
|
---|
[574] | 2840 | mPolys.reserve(rhs.mPolys.size());
|
---|
| 2841 |
|
---|
[508] | 2842 | PolygonContainer::const_iterator it, it_end = rhs.mPolys.end();
|
---|
[678] | 2843 |
|
---|
| 2844 | int i = 0;
|
---|
| 2845 |
|
---|
[508] | 2846 | for (it = rhs.mPolys.begin(); it != it_end; ++ it)
|
---|
| 2847 | {
|
---|
| 2848 | Polygon3 *poly = *it;
|
---|
[678] | 2849 | Add(new Polygon3(*poly), rhs.mPlanes[i ++]);
|
---|
[508] | 2850 | }
|
---|
| 2851 | }
|
---|
| 2852 |
|
---|
[574] | 2853 |
|
---|
[463] | 2854 | BspNodeGeometry::~BspNodeGeometry()
|
---|
| 2855 | {
|
---|
| 2856 | CLEAR_CONTAINER(mPolys);
|
---|
| 2857 | }
|
---|
| 2858 |
|
---|
[503] | 2859 |
|
---|
[678] | 2860 | int BspNodeGeometry::Size() const
|
---|
| 2861 | {
|
---|
| 2862 | return (int)mPolys.size();
|
---|
| 2863 | }
|
---|
| 2864 |
|
---|
| 2865 |
|
---|
| 2866 | const PolygonContainer &BspNodeGeometry::GetPolys()
|
---|
| 2867 | {
|
---|
| 2868 | return mPolys;
|
---|
| 2869 | }
|
---|
| 2870 |
|
---|
| 2871 |
|
---|
| 2872 | void BspNodeGeometry::Add(Polygon3 *p, const Plane3 &plane)
|
---|
| 2873 | {
|
---|
| 2874 | mPolys.push_back(p);
|
---|
| 2875 | mPlanes.push_back(plane);
|
---|
| 2876 | }
|
---|
| 2877 |
|
---|
| 2878 |
|
---|
[463] | 2879 | float BspNodeGeometry::GetArea() const
|
---|
| 2880 | {
|
---|
| 2881 | return Polygon3::GetArea(mPolys);
|
---|
| 2882 | }
|
---|
| 2883 |
|
---|
[503] | 2884 |
|
---|
[544] | 2885 | float BspNodeGeometry::GetVolume() const
|
---|
| 2886 | {
|
---|
| 2887 | //-- compute volume using tetrahedralization of the geometry
|
---|
| 2888 | // and adding the volume of the single tetrahedrons
|
---|
| 2889 | float volume = 0;
|
---|
| 2890 | const float f = 1.0f / 6.0f;
|
---|
| 2891 |
|
---|
| 2892 | PolygonContainer::const_iterator pit, pit_end = mPolys.end();
|
---|
| 2893 |
|
---|
[545] | 2894 | // note: can take arbitrary point, e.g., the origin. However,
|
---|
[587] | 2895 | // we rather take the center of mass to prevents precision errors
|
---|
[545] | 2896 | const Vector3 center = CenterOfMass();
|
---|
| 2897 |
|
---|
[544] | 2898 | for (pit = mPolys.begin(); pit != pit_end; ++ pit)
|
---|
| 2899 | {
|
---|
| 2900 | Polygon3 *poly = *pit;
|
---|
[545] | 2901 | const Vector3 v0 = poly->mVertices[0] - center;
|
---|
[544] | 2902 |
|
---|
| 2903 | for (int i = 1; i < (int)poly->mVertices.size() - 1; ++ i)
|
---|
| 2904 | {
|
---|
[545] | 2905 | const Vector3 v1 = poly->mVertices[i] - center;
|
---|
| 2906 | const Vector3 v2 = poly->mVertices[i + 1] - center;
|
---|
| 2907 |
|
---|
[678] | 2908 | // more robust version using abs and the center of mass
|
---|
| 2909 | volume += fabs (f * (DotProd(v0, CrossProd(v1, v2))));
|
---|
[544] | 2910 | }
|
---|
| 2911 | }
|
---|
| 2912 |
|
---|
| 2913 | return volume;
|
---|
| 2914 | }
|
---|
| 2915 |
|
---|
| 2916 |
|
---|
[697] | 2917 | void BspNodeGeometry::GetBoundingBox(AxisAlignedBox3 &box) const
|
---|
| 2918 | {
|
---|
| 2919 | box.Initialize();
|
---|
| 2920 | Polygon3::IncludeInBox(mPolys, box);
|
---|
| 2921 | }
|
---|
| 2922 |
|
---|
| 2923 |
|
---|
| 2924 | int BspNodeGeometry::Side(const Plane3 &plane) const
|
---|
| 2925 | {
|
---|
| 2926 | PolygonContainer::const_iterator it, it_end = mPolys.end();
|
---|
| 2927 |
|
---|
| 2928 | bool onFrontSide = false;
|
---|
| 2929 | bool onBackSide = false;
|
---|
| 2930 |
|
---|
| 2931 | for (it = mPolys.begin(); it != it_end; ++ it)
|
---|
| 2932 | {
|
---|
| 2933 | const int side = (*it)->Side(plane, 0.0f);
|
---|
| 2934 |
|
---|
| 2935 | if (side == -1)
|
---|
| 2936 | onBackSide = true;
|
---|
| 2937 | else if (side == 1)
|
---|
| 2938 | onFrontSide = true;
|
---|
| 2939 |
|
---|
| 2940 | if ((side == 0) || (onBackSide && onFrontSide))
|
---|
| 2941 | return 0;
|
---|
| 2942 | }
|
---|
| 2943 |
|
---|
| 2944 | if (onFrontSide)
|
---|
| 2945 | return 1;
|
---|
| 2946 |
|
---|
| 2947 | return -1;
|
---|
| 2948 | }
|
---|
| 2949 |
|
---|
| 2950 |
|
---|
| 2951 | int BspNodeGeometry::ComputeIntersection(const AxisAlignedBox3 &box) const
|
---|
| 2952 | {
|
---|
[704] | 2953 | // 1: box does not intersect geometry
|
---|
| 2954 | // 0: box intersects geometry
|
---|
| 2955 | // -1: box contains geometry
|
---|
| 2956 |
|
---|
[697] | 2957 | AxisAlignedBox3 boundingBox;
|
---|
| 2958 | GetBoundingBox(boundingBox);
|
---|
| 2959 |
|
---|
| 2960 | // no intersections with bounding box
|
---|
[704] | 2961 | if (!Overlap(box, boundingBox))
|
---|
[697] | 2962 | {
|
---|
| 2963 | return 1;
|
---|
| 2964 | }
|
---|
| 2965 |
|
---|
[704] | 2966 | // box cotains bounding box of geometry >=> contains geometry
|
---|
| 2967 | if (box.Includes(boundingBox))
|
---|
| 2968 | return -1;
|
---|
| 2969 |
|
---|
| 2970 | int result = 0;
|
---|
| 2971 |
|
---|
| 2972 | // test geometry planes for intersections
|
---|
| 2973 | vector<Plane3>::const_iterator it, it_end = mPlanes.end();
|
---|
| 2974 |
|
---|
| 2975 | for (it = mPlanes.begin(); it != it_end; ++ it)
|
---|
[697] | 2976 | {
|
---|
[704] | 2977 | const int side = box.Side(*it);
|
---|
[697] | 2978 |
|
---|
| 2979 | // box does not intersects geometry
|
---|
| 2980 | if (side == 1)
|
---|
[704] | 2981 | {
|
---|
[697] | 2982 | return 1;
|
---|
[704] | 2983 | }
|
---|
| 2984 | //if (side == 0) result = 0;
|
---|
[697] | 2985 | }
|
---|
| 2986 |
|
---|
| 2987 | return result;
|
---|
| 2988 | }
|
---|
| 2989 |
|
---|
| 2990 |
|
---|
[545] | 2991 | Vector3 BspNodeGeometry::CenterOfMass() const
|
---|
[544] | 2992 | {
|
---|
| 2993 | int n = 0;
|
---|
| 2994 |
|
---|
| 2995 | Vector3 center(0,0,0);
|
---|
| 2996 |
|
---|
| 2997 | PolygonContainer::const_iterator pit, pit_end = mPolys.end();
|
---|
| 2998 |
|
---|
| 2999 | for (pit = mPolys.begin(); pit != pit_end; ++ pit)
|
---|
| 3000 | {
|
---|
| 3001 | Polygon3 *poly = *pit;
|
---|
| 3002 |
|
---|
| 3003 | VertexContainer::const_iterator vit, vit_end = poly->mVertices.end();
|
---|
| 3004 |
|
---|
| 3005 | for(vit = poly->mVertices.begin(); vit != vit_end; ++ vit)
|
---|
| 3006 | {
|
---|
| 3007 | center += *vit;
|
---|
| 3008 | ++ n;
|
---|
| 3009 | }
|
---|
| 3010 | }
|
---|
| 3011 |
|
---|
[679] | 3012 | //Debug << "center: " << center << " new " << center / (float)n << endl;
|
---|
| 3013 |
|
---|
[544] | 3014 | return center / (float)n;
|
---|
| 3015 | }
|
---|
| 3016 |
|
---|
| 3017 |
|
---|
[678] | 3018 | bool BspNodeGeometry::Valid() const
|
---|
| 3019 | {
|
---|
| 3020 | if (mPolys.size() < 4)
|
---|
| 3021 | return false;
|
---|
| 3022 |
|
---|
| 3023 | return true;
|
---|
| 3024 | }
|
---|
| 3025 |
|
---|
| 3026 |
|
---|
[503] | 3027 | void BspNodeGeometry::AddToMesh(Mesh &mesh)
|
---|
| 3028 | {
|
---|
| 3029 | PolygonContainer::const_iterator it, it_end = mPolys.end();
|
---|
[508] | 3030 |
|
---|
[503] | 3031 | for (it = mPolys.begin(); it != mPolys.end(); ++ it)
|
---|
| 3032 | {
|
---|
[508] | 3033 | (*it)->AddToMesh(mesh);
|
---|
[503] | 3034 | }
|
---|
| 3035 | }
|
---|
| 3036 |
|
---|
| 3037 |
|
---|
[679] | 3038 | bool BspNodeGeometry::SplitGeometry(BspNodeGeometry &front,
|
---|
[463] | 3039 | BspNodeGeometry &back,
|
---|
| 3040 | const Plane3 &splitPlane,
|
---|
| 3041 | const AxisAlignedBox3 &box,
|
---|
| 3042 | const float epsilon) const
|
---|
| 3043 | {
|
---|
| 3044 | // get cross section of new polygon
|
---|
| 3045 | Polygon3 *planePoly = box.CrossSection(splitPlane);
|
---|
[682] | 3046 | //Vector3 ndummy = planePoly->GetSupportingPlane().mNormal;
|
---|
[463] | 3047 | // split polygon with all other polygons
|
---|
| 3048 | planePoly = SplitPolygon(planePoly, epsilon);
|
---|
| 3049 |
|
---|
[682] | 3050 | bool splitsGeom = (planePoly != NULL);
|
---|
[681] | 3051 |
|
---|
[463] | 3052 | //-- new polygon splits all other polygons
|
---|
[679] | 3053 | for (int i = 0; i < (int)mPolys.size()/* && planePoly*/; ++ i)
|
---|
[463] | 3054 | {
|
---|
| 3055 | /// don't use epsilon here to get exact split planes
|
---|
| 3056 | const int cf =
|
---|
[676] | 3057 | mPolys[i]->ClassifyPlane(splitPlane, epsilon);
|
---|
[463] | 3058 |
|
---|
| 3059 | switch (cf)
|
---|
| 3060 | {
|
---|
| 3061 | case Polygon3::SPLIT:
|
---|
| 3062 | {
|
---|
| 3063 | Polygon3 *poly = new Polygon3(mPolys[i]->mVertices);
|
---|
| 3064 |
|
---|
| 3065 | Polygon3 *frontPoly = new Polygon3();
|
---|
| 3066 | Polygon3 *backPoly = new Polygon3();
|
---|
| 3067 |
|
---|
| 3068 | poly->Split(splitPlane,
|
---|
| 3069 | *frontPoly,
|
---|
| 3070 | *backPoly,
|
---|
| 3071 | epsilon);
|
---|
| 3072 |
|
---|
| 3073 | DEL_PTR(poly);
|
---|
| 3074 |
|
---|
| 3075 | if (frontPoly->Valid(epsilon))
|
---|
[678] | 3076 | {
|
---|
| 3077 | front.Add(frontPoly, mPlanes[i]);
|
---|
| 3078 | }
|
---|
[463] | 3079 | else
|
---|
[678] | 3080 | {
|
---|
[681] | 3081 | //Debug << "no f! " << endl;
|
---|
[463] | 3082 | DEL_PTR(frontPoly);
|
---|
[678] | 3083 | }
|
---|
[679] | 3084 |
|
---|
[463] | 3085 | if (backPoly->Valid(epsilon))
|
---|
[678] | 3086 | {
|
---|
| 3087 | back.Add(backPoly, mPlanes[i]);
|
---|
| 3088 | }
|
---|
[463] | 3089 | else
|
---|
[678] | 3090 | {
|
---|
[681] | 3091 | //Debug << "no b! " << endl;
|
---|
[463] | 3092 | DEL_PTR(backPoly);
|
---|
[678] | 3093 | }
|
---|
[463] | 3094 | }
|
---|
| 3095 |
|
---|
| 3096 | break;
|
---|
| 3097 | case Polygon3::BACK_SIDE:
|
---|
[678] | 3098 | back.Add(new Polygon3(mPolys[i]->mVertices), mPlanes[i]);
|
---|
[463] | 3099 | break;
|
---|
| 3100 | case Polygon3::FRONT_SIDE:
|
---|
[678] | 3101 | front.Add(new Polygon3(mPolys[i]->mVertices), mPlanes[i]);
|
---|
[463] | 3102 | break;
|
---|
[678] | 3103 | // only put into back container (split should have no effect ...)
|
---|
[463] | 3104 | case Polygon3::COINCIDENT:
|
---|
[684] | 3105 | //Debug << "error should not come here" << endl;
|
---|
[681] | 3106 | splitsGeom = false;
|
---|
[678] | 3107 |
|
---|
[683] | 3108 | if (DotProd(mPlanes[i].mNormal, splitPlane.mNormal > 0))
|
---|
[681] | 3109 | back.Add(new Polygon3(mPolys[i]->mVertices), mPlanes[i]);
|
---|
| 3110 | else
|
---|
| 3111 | front.Add(new Polygon3(mPolys[i]->mVertices), mPlanes[i]);
|
---|
[463] | 3112 | break;
|
---|
| 3113 | default:
|
---|
| 3114 | break;
|
---|
| 3115 | }
|
---|
| 3116 | }
|
---|
| 3117 |
|
---|
| 3118 | //-- finally add the new polygon to the child node geometries
|
---|
| 3119 | if (planePoly)
|
---|
| 3120 | {
|
---|
[683] | 3121 | // add polygon with reverse orientation to front cell
|
---|
[682] | 3122 | Plane3 reversePlane(splitPlane);
|
---|
| 3123 | reversePlane.ReverseOrientation();
|
---|
| 3124 |
|
---|
[463] | 3125 | // add polygon with normal pointing into positive half space to back cell
|
---|
[678] | 3126 | back.Add(planePoly, splitPlane);
|
---|
| 3127 | //back.mPolys.push_back(planePoly);
|
---|
[683] | 3128 |
|
---|
[682] | 3129 | Polygon3 *reversePoly = planePoly->CreateReversePolygon();
|
---|
| 3130 | front.Add(reversePoly, reversePlane);
|
---|
[684] | 3131 | //Debug << "poly normal : " << reversePoly->GetSupportingPlane().mNormal << " split plane normal " << reversePlane.mNormal << endl;
|
---|
[463] | 3132 | }
|
---|
[684] | 3133 |
|
---|
[679] | 3134 |
|
---|
[681] | 3135 | return splitsGeom;
|
---|
[463] | 3136 | }
|
---|
| 3137 |
|
---|
[574] | 3138 |
|
---|
[463] | 3139 | Polygon3 *BspNodeGeometry::SplitPolygon(Polygon3 *planePoly,
|
---|
| 3140 | const float epsilon) const
|
---|
| 3141 | {
|
---|
| 3142 | if (!planePoly->Valid(epsilon))
|
---|
[683] | 3143 | {
|
---|
[684] | 3144 | //Debug << "not valid!!" << endl;
|
---|
[463] | 3145 | DEL_PTR(planePoly);
|
---|
[683] | 3146 | }
|
---|
[463] | 3147 | // polygon is split by all other planes
|
---|
| 3148 | for (int i = 0; (i < (int)mPolys.size()) && planePoly; ++ i)
|
---|
| 3149 | {
|
---|
[683] | 3150 | //Plane3 plane = mPolys[i]->GetSupportingPlane();
|
---|
[678] | 3151 | Plane3 plane = mPlanes[i];
|
---|
[683] | 3152 |
|
---|
[463] | 3153 | /// don't use epsilon here to get exact split planes
|
---|
| 3154 | const int cf =
|
---|
[678] | 3155 | planePoly->ClassifyPlane(plane, epsilon);
|
---|
[463] | 3156 |
|
---|
| 3157 | // split new polygon with all previous planes
|
---|
| 3158 | switch (cf)
|
---|
| 3159 | {
|
---|
| 3160 | case Polygon3::SPLIT:
|
---|
| 3161 | {
|
---|
| 3162 | Polygon3 *frontPoly = new Polygon3();
|
---|
| 3163 | Polygon3 *backPoly = new Polygon3();
|
---|
| 3164 |
|
---|
| 3165 | planePoly->Split(plane,
|
---|
| 3166 | *frontPoly,
|
---|
| 3167 | *backPoly,
|
---|
| 3168 | epsilon);
|
---|
| 3169 |
|
---|
| 3170 | // don't need anymore
|
---|
| 3171 | DEL_PTR(planePoly);
|
---|
| 3172 | DEL_PTR(frontPoly);
|
---|
| 3173 |
|
---|
| 3174 | // back polygon is belonging to geometry
|
---|
| 3175 | if (backPoly->Valid(epsilon))
|
---|
| 3176 | planePoly = backPoly;
|
---|
| 3177 | else
|
---|
| 3178 | DEL_PTR(backPoly);
|
---|
| 3179 | }
|
---|
| 3180 | break;
|
---|
| 3181 | case Polygon3::FRONT_SIDE:
|
---|
| 3182 | DEL_PTR(planePoly);
|
---|
| 3183 | break;
|
---|
| 3184 | // polygon is taken as it is
|
---|
| 3185 | case Polygon3::BACK_SIDE:
|
---|
| 3186 | case Polygon3::COINCIDENT:
|
---|
| 3187 | default:
|
---|
| 3188 | break;
|
---|
| 3189 | }
|
---|
| 3190 | }
|
---|
| 3191 |
|
---|
| 3192 | return planePoly;
|
---|
| 3193 | }
|
---|
[480] | 3194 |
|
---|
[492] | 3195 |
|
---|
[679] | 3196 | ViewCell *BspTree::GetViewCell(const Vector3 &point)
|
---|
[492] | 3197 | {
|
---|
[502] | 3198 | if (mRoot == NULL)
|
---|
| 3199 | return NULL;
|
---|
| 3200 |
|
---|
| 3201 |
|
---|
[492] | 3202 | stack<BspNode *> nodeStack;
|
---|
| 3203 | nodeStack.push(mRoot);
|
---|
| 3204 |
|
---|
| 3205 | ViewCell *viewcell = NULL;
|
---|
| 3206 |
|
---|
| 3207 | while (!nodeStack.empty()) {
|
---|
| 3208 | BspNode *node = nodeStack.top();
|
---|
| 3209 | nodeStack.pop();
|
---|
| 3210 |
|
---|
| 3211 | if (node->IsLeaf()) {
|
---|
| 3212 | viewcell = dynamic_cast<BspLeaf *>(node)->mViewCell;
|
---|
| 3213 | break;
|
---|
| 3214 | } else {
|
---|
| 3215 |
|
---|
| 3216 | BspInterior *interior = dynamic_cast<BspInterior *>(node);
|
---|
| 3217 |
|
---|
| 3218 | // random decision
|
---|
| 3219 | if (interior->GetPlane().Side(point) < 0)
|
---|
| 3220 | nodeStack.push(interior->GetBack());
|
---|
| 3221 | else
|
---|
| 3222 | nodeStack.push(interior->GetFront());
|
---|
| 3223 | }
|
---|
| 3224 | }
|
---|
| 3225 |
|
---|
| 3226 | return viewcell;
|
---|
| 3227 | }
|
---|
| 3228 |
|
---|
[590] | 3229 |
|
---|
| 3230 | bool BspTree::Export(ofstream &stream)
|
---|
| 3231 | {
|
---|
| 3232 | ExportNode(mRoot, stream);
|
---|
| 3233 |
|
---|
| 3234 | return true;
|
---|
| 3235 | }
|
---|
| 3236 |
|
---|
| 3237 |
|
---|
| 3238 | void BspTree::ExportNode(BspNode *node, ofstream &stream)
|
---|
| 3239 | {
|
---|
| 3240 | if (node->IsLeaf())
|
---|
| 3241 | {
|
---|
| 3242 | BspLeaf *leaf = dynamic_cast<BspLeaf *>(node);
|
---|
| 3243 |
|
---|
| 3244 | int id = -1;
|
---|
| 3245 | if (leaf->GetViewCell() != mOutOfBoundsCell)
|
---|
| 3246 | id = leaf->GetViewCell()->GetId();
|
---|
| 3247 |
|
---|
| 3248 | stream << "<Leaf viewCellId=\"" << id << "\" />" << endl;
|
---|
| 3249 | }
|
---|
| 3250 | else
|
---|
| 3251 | {
|
---|
| 3252 | BspInterior *interior = dynamic_cast<BspInterior *>(node);
|
---|
| 3253 |
|
---|
| 3254 | Plane3 plane = interior->GetPlane();
|
---|
| 3255 | stream << "<Interior plane=\"" << plane.mNormal.x << " "
|
---|
| 3256 | << plane.mNormal.y << " " << plane.mNormal.z << " "
|
---|
| 3257 | << plane.mD << "\">" << endl;
|
---|
| 3258 |
|
---|
| 3259 | ExportNode(interior->GetBack(), stream);
|
---|
| 3260 | ExportNode(interior->GetFront(), stream);
|
---|
| 3261 |
|
---|
| 3262 | stream << "</Interior>" << endl;
|
---|
| 3263 | }
|
---|
| 3264 | }
|
---|