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