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