[375] | 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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| 10 | #include <stack> |
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| 11 | #include <time.h> |
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| 12 | #include <iomanip> |
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| 13 | #include "Exporter.h" |
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| 14 | #include "Plane3.h" |
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| 15 | |
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[421] | 16 | //-- static members |
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[375] | 17 | |
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[421] | 18 | int BspNode::sMailId = 1; |
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| 19 | |
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[375] | 20 | /** Evaluates split plane classification with respect to the plane's |
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| 21 | contribution for a minimum number splits in the tree. |
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| 22 | */ |
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[421] | 23 | const float BspTree::sLeastPolySplitsTable[] = {0, 0, 1, 0}; |
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[375] | 24 | /** Evaluates split plane classification with respect to the plane's |
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| 25 | contribution for a balanced tree. |
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| 26 | */ |
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[421] | 27 | const float BspTree::sBalancedPolysTable[] = {1, -1, 0, 0}; |
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[375] | 28 | |
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| 29 | /** Evaluates split plane classification with respect to the plane's |
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| 30 | contribution for a minimum number of ray splits. |
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| 31 | */ |
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[421] | 32 | const float BspTree::sLeastRaySplitsTable[] = {0, 0, 1, 1, 0}; |
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[375] | 33 | /** Evaluates split plane classification with respect to the plane's |
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| 34 | contribution for balanced rays. |
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| 35 | */ |
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[421] | 36 | const float BspTree::sBalancedRaysTable[] = {1, -1, 0, 0, 0}; |
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[375] | 37 | |
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[421] | 38 | int BspTree::sConstructionMethod = FROM_INPUT_VIEW_CELLS; |
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| 39 | |
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[428] | 40 | int BspTree::sFrontId = 0; |
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| 41 | int BspTree::sBackId = 0; |
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| 42 | int BspTree::sFrontAndBackId = 0; |
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[421] | 43 | |
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[375] | 44 | /****************************************************************/ |
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| 45 | /* class BspNode implementation */ |
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| 46 | /****************************************************************/ |
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| 47 | |
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| 48 | BspNode::BspNode(): |
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[390] | 49 | mParent(NULL) |
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[375] | 50 | {} |
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| 51 | |
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| 52 | BspNode::BspNode(BspInterior *parent): |
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[390] | 53 | mParent(parent) |
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[375] | 54 | {} |
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| 55 | |
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| 56 | |
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| 57 | bool BspNode::IsRoot() const |
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| 58 | { |
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| 59 | return mParent == NULL; |
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| 60 | } |
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| 61 | |
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| 62 | BspInterior *BspNode::GetParent() |
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| 63 | { |
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| 64 | return mParent; |
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| 65 | } |
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| 66 | |
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| 67 | void BspNode::SetParent(BspInterior *parent) |
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| 68 | { |
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| 69 | mParent = parent; |
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| 70 | } |
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| 71 | |
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| 72 | /****************************************************************/ |
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| 73 | /* class BspInterior implementation */ |
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| 74 | /****************************************************************/ |
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| 75 | |
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| 76 | |
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| 77 | BspInterior::BspInterior(const Plane3 &plane): |
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| 78 | mPlane(plane), mFront(NULL), mBack(NULL) |
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| 79 | {} |
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| 80 | |
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[411] | 81 | BspInterior::~BspInterior() |
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| 82 | { |
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| 83 | DEL_PTR(mFront); |
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| 84 | DEL_PTR(mBack); |
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| 85 | } |
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| 86 | |
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[375] | 87 | bool BspInterior::IsLeaf() const |
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| 88 | { |
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| 89 | return false; |
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| 90 | } |
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| 91 | |
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| 92 | BspNode *BspInterior::GetBack() |
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| 93 | { |
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| 94 | return mBack; |
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| 95 | } |
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| 96 | |
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| 97 | BspNode *BspInterior::GetFront() |
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| 98 | { |
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| 99 | return mFront; |
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| 100 | } |
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| 101 | |
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| 102 | Plane3 *BspInterior::GetPlane() |
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| 103 | { |
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| 104 | return &mPlane; |
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| 105 | } |
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| 106 | |
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| 107 | void BspInterior::ReplaceChildLink(BspNode *oldChild, BspNode *newChild) |
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| 108 | { |
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| 109 | if (mBack == oldChild) |
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| 110 | mBack = newChild; |
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| 111 | else |
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| 112 | mFront = newChild; |
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| 113 | } |
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| 114 | |
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| 115 | void BspInterior::SetupChildLinks(BspNode *b, BspNode *f) |
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| 116 | { |
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| 117 | mBack = b; |
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| 118 | mFront = f; |
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| 119 | } |
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| 120 | |
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| 121 | int BspInterior::SplitPolygons(PolygonContainer &polys, |
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| 122 | PolygonContainer &frontPolys, |
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| 123 | PolygonContainer &backPolys, |
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[390] | 124 | PolygonContainer &coincident) |
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[375] | 125 | { |
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| 126 | Polygon3 *splitPoly = NULL; |
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| 127 | |
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| 128 | int splits = 0; |
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| 129 | |
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| 130 | #ifdef _Debug |
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| 131 | Debug << "splitting polygons of node " << this << " with plane " << mPlane << endl; |
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| 132 | #endif |
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| 133 | while (!polys.empty()) |
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| 134 | { |
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| 135 | Polygon3 *poly = polys.back(); |
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| 136 | polys.pop_back(); |
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| 137 | |
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| 138 | //Debug << "New polygon with plane: " << poly->GetSupportingPlane() << "\n"; |
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| 139 | |
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| 140 | // classify polygon |
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| 141 | const int cf = poly->ClassifyPlane(mPlane); |
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| 142 | |
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| 143 | Polygon3 *front_piece = NULL; |
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| 144 | Polygon3 *back_piece = NULL; |
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| 145 | |
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| 146 | switch (cf) |
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| 147 | { |
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| 148 | case Polygon3::COINCIDENT: |
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| 149 | coincident.push_back(poly); |
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| 150 | break; |
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| 151 | case Polygon3::FRONT_SIDE: |
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| 152 | frontPolys.push_back(poly); |
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| 153 | break; |
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| 154 | case Polygon3::BACK_SIDE: |
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| 155 | backPolys.push_back(poly); |
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| 156 | break; |
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| 157 | case Polygon3::SPLIT: |
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| 158 | front_piece = new Polygon3(poly->mParent); |
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| 159 | back_piece = new Polygon3(poly->mParent); |
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| 160 | |
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| 161 | //-- split polygon into front and back part |
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| 162 | poly->Split(mPlane, |
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| 163 | *front_piece, |
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[436] | 164 | *back_piece); |
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[375] | 165 | |
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| 166 | ++ splits; // increase number of splits |
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| 167 | |
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| 168 | //-- inherit rays from parent polygon for blocked ray criterium |
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| 169 | poly->InheritRays(*front_piece, *back_piece); |
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| 170 | //Debug << "p: " << poly->mPiercingRays.size() << " f: " << front_piece->mPiercingRays.size() << " b: " << back_piece->mPiercingRays.size() << endl; |
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| 171 | |
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| 172 | // check if polygons still valid |
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| 173 | if (front_piece->Valid()) |
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| 174 | frontPolys.push_back(front_piece); |
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| 175 | else |
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| 176 | DEL_PTR(front_piece); |
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| 177 | |
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| 178 | if (back_piece->Valid()) |
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| 179 | backPolys.push_back(back_piece); |
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| 180 | else |
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| 181 | DEL_PTR(back_piece); |
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| 182 | |
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| 183 | #ifdef _DEBUG |
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| 184 | Debug << "split " << *poly << endl << *front_piece << endl << *back_piece << endl; |
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| 185 | #endif |
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[390] | 186 | DEL_PTR(poly); |
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[375] | 187 | break; |
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| 188 | default: |
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| 189 | Debug << "SHOULD NEVER COME HERE\n"; |
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| 190 | break; |
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| 191 | } |
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| 192 | } |
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| 193 | |
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| 194 | return splits; |
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| 195 | } |
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| 196 | |
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| 197 | /****************************************************************/ |
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| 198 | /* class BspLeaf implementation */ |
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| 199 | /****************************************************************/ |
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| 200 | BspLeaf::BspLeaf(): mViewCell(NULL) |
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| 201 | { |
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| 202 | } |
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| 203 | |
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| 204 | BspLeaf::BspLeaf(BspViewCell *viewCell): |
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| 205 | mViewCell(viewCell) |
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| 206 | { |
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| 207 | } |
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| 208 | |
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| 209 | BspLeaf::BspLeaf(BspInterior *parent): |
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| 210 | BspNode(parent), mViewCell(NULL) |
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| 211 | {} |
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| 212 | |
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| 213 | BspLeaf::BspLeaf(BspInterior *parent, BspViewCell *viewCell): |
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| 214 | BspNode(parent), mViewCell(viewCell) |
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| 215 | { |
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| 216 | } |
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| 217 | |
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| 218 | BspViewCell *BspLeaf::GetViewCell() const |
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| 219 | { |
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| 220 | return mViewCell; |
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| 221 | } |
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| 222 | |
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| 223 | void BspLeaf::SetViewCell(BspViewCell *viewCell) |
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| 224 | { |
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| 225 | mViewCell = viewCell; |
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| 226 | } |
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| 227 | |
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| 228 | bool BspLeaf::IsLeaf() const |
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| 229 | { |
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| 230 | return true; |
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| 231 | } |
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| 232 | |
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[392] | 233 | void BspLeaf::AddToPvs(const BoundedRayContainer &rays, |
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| 234 | int &sampleContributions, |
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[420] | 235 | int &contributingSamples, |
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| 236 | bool storeLeavesWithRays) |
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[375] | 237 | { |
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| 238 | sampleContributions = 0; |
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| 239 | contributingSamples = 0; |
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| 240 | |
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| 241 | BoundedRayContainer::const_iterator it, it_end = rays.end(); |
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| 242 | |
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| 243 | // add contributions from samples to the PVS |
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| 244 | for (it = rays.begin(); it != it_end; ++ it) |
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| 245 | { |
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| 246 | int contribution = 0; |
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| 247 | Ray *ray = (*it)->mRay; |
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| 248 | |
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| 249 | if (!ray->intersections.empty()) |
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[414] | 250 | contribution += mViewCell->GetPvs().AddSample(ray->intersections[0].mObject); |
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| 251 | |
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[399] | 252 | if (ray->sourceObject.mObject) |
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| 253 | contribution += mViewCell->GetPvs().AddSample(ray->sourceObject.mObject); |
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[375] | 254 | |
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| 255 | if (contribution > 0) |
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| 256 | { |
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| 257 | sampleContributions += contribution; |
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| 258 | ++ contributingSamples; |
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| 259 | } |
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[414] | 260 | |
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[420] | 261 | if (storeLeavesWithRays) |
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[407] | 262 | // warning: intersections not ordered |
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| 263 | ray->bspIntersections.push_back(Ray::BspIntersection((*it)->mMinT, this)); |
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[375] | 264 | } |
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| 265 | } |
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| 266 | |
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| 267 | |
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| 268 | /****************************************************************/ |
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| 269 | /* class BspTree implementation */ |
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| 270 | /****************************************************************/ |
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| 271 | |
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[392] | 272 | BspTree::BspTree(BspViewCell *viewCell): |
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[420] | 273 | mRootCell(viewCell), |
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| 274 | mRoot(NULL), |
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| 275 | mGenerateViewCells(false), |
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| 276 | mStoreLeavesWithRays(false), |
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| 277 | mPvsUseArea(true) |
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[375] | 278 | { |
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| 279 | Randomize(); // initialise random generator for heuristics |
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[421] | 280 | |
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| 281 | //-- termination criteria for autopartition |
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| 282 | environment->GetIntValue("BspTree.Termination.maxDepth", mTermMaxDepth); |
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| 283 | environment->GetIntValue("BspTree.Termination.minPvs", mTermMinPvs); |
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[426] | 284 | environment->GetIntValue("BspTree.Termination.minPolygons", mTermMinPolys); |
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| 285 | environment->GetIntValue("BspTree.Termination.minRays", mTermMinRays); |
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[421] | 286 | environment->GetFloatValue("BspTree.Termination.minArea", mTermMinArea); |
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| 287 | environment->GetFloatValue("BspTree.Termination.maxRayContribution", mTermMaxRayContribution); |
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[426] | 288 | environment->GetFloatValue("BspTree.Termination.minAccRayLenght", mTermMinAccRayLength); |
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[421] | 289 | |
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[424] | 290 | //-- factors for bsp tree split plane heuristics |
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| 291 | environment->GetFloatValue("BspTree.Factor.verticalSplits", mVerticalSplitsFactor); |
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| 292 | environment->GetFloatValue("BspTree.Factor.largestPolyArea", mLargestPolyAreaFactor); |
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| 293 | environment->GetFloatValue("BspTree.Factor.blockedRays", mBlockedRaysFactor); |
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| 294 | environment->GetFloatValue("BspTree.Factor.leastRaySplits", mLeastRaySplitsFactor); |
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| 295 | environment->GetFloatValue("BspTree.Factor.balancedRays", mBalancedRaysFactor); |
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| 296 | environment->GetFloatValue("BspTree.Factor.pvsFactor", mPvsFactor); |
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| 297 | environment->GetFloatValue("BspTree.Factor.leastSplits" , mLeastSplitsFactor); |
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| 298 | environment->GetFloatValue("BspTree.Factor.balancedPolys", mBalancedPolysFactor); |
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| 299 | environment->GetFloatValue("BspTree.Factor.balancedViewCells", mBalancedViewCellsFactor); |
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| 300 | environment->GetFloatValue("BspTree.Termination.ct_div_ci", mCtDivCi); |
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| 301 | |
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[421] | 302 | //-- termination criteria for axis aligned split |
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[424] | 303 | environment->GetFloatValue("BspTree.Termination.AxisAligned.ct_div_ci", mAaCtDivCi); |
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[421] | 304 | environment->GetFloatValue("BspTree.Termination.AxisAligned.maxCostRatio", mMaxCostRatio); |
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[426] | 305 | environment->GetIntValue("BspTree.Termination.AxisAligned.minPolys", |
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| 306 | mTermMinPolysForAxisAligned); |
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[430] | 307 | environment->GetIntValue("BspTree.Termination.AxisAligned.minRays", |
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[426] | 308 | mTermMinRaysForAxisAligned); |
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[430] | 309 | environment->GetIntValue("BspTree.Termination.AxisAligned.minObjects", |
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[426] | 310 | mTermMinObjectsForAxisAligned); |
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[421] | 311 | //-- partition criteria |
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| 312 | environment->GetIntValue("BspTree.maxPolyCandidates", mMaxPolyCandidates); |
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| 313 | environment->GetIntValue("BspTree.maxRayCandidates", mMaxRayCandidates); |
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| 314 | environment->GetIntValue("BspTree.splitPlaneStrategy", mSplitPlaneStrategy); |
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| 315 | environment->GetFloatValue("BspTree.AxisAligned.splitBorder", mSplitBorder); |
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| 316 | |
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| 317 | environment->GetFloatValue("BspTree.Construction.sideTolerance", Vector3::sDistTolerance); |
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| 318 | Vector3::sDistToleranceSqrt = Vector3::sDistTolerance * Vector3::sDistTolerance; |
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| 319 | |
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| 320 | // post processing stuff |
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| 321 | environment->GetIntValue("ViewCells.PostProcessing.minPvsDif", mMinPvsDif); |
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| 322 | environment->GetIntValue("ViewCells.PostProcessing.minPvs", mMinPvs); |
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| 323 | environment->GetIntValue("ViewCells.PostProcessing.maxPvs", mMaxPvs); |
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| 324 | |
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| 325 | Debug << "BSP max depth: " << mTermMaxDepth << endl; |
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| 326 | Debug << "BSP min PVS: " << mTermMinPvs << endl; |
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| 327 | Debug << "BSP min area: " << mTermMinArea << endl; |
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[426] | 328 | Debug << "BSP max polys: " << mTermMinPolys << endl; |
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| 329 | Debug << "BSP max rays: " << mTermMinRays << endl; |
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[421] | 330 | Debug << "BSP max polygon candidates: " << mMaxPolyCandidates << endl; |
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| 331 | Debug << "BSP max plane candidates: " << mMaxRayCandidates << endl; |
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| 332 | |
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| 333 | Debug << "Split plane strategy: "; |
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| 334 | if (mSplitPlaneStrategy & RANDOM_POLYGON) |
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| 335 | Debug << "random polygon "; |
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| 336 | if (mSplitPlaneStrategy & AXIS_ALIGNED) |
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| 337 | Debug << "axis aligned "; |
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| 338 | if (mSplitPlaneStrategy & LEAST_SPLITS) |
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| 339 | Debug << "least splits "; |
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| 340 | if (mSplitPlaneStrategy & BALANCED_POLYS) |
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| 341 | Debug << "balanced polygons "; |
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| 342 | if (mSplitPlaneStrategy & BALANCED_VIEW_CELLS) |
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| 343 | Debug << "balanced view cells "; |
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| 344 | if (mSplitPlaneStrategy & LARGEST_POLY_AREA) |
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| 345 | Debug << "largest polygon area "; |
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| 346 | if (mSplitPlaneStrategy & VERTICAL_AXIS) |
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| 347 | Debug << "vertical axis "; |
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| 348 | if (mSplitPlaneStrategy & BLOCKED_RAYS) |
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| 349 | Debug << "blocked rays "; |
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| 350 | if (mSplitPlaneStrategy & LEAST_RAY_SPLITS) |
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| 351 | Debug << "least ray splits "; |
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| 352 | if (mSplitPlaneStrategy & BALANCED_RAYS) |
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| 353 | Debug << "balanced rays "; |
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| 354 | if (mSplitPlaneStrategy & PVS) |
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| 355 | Debug << "pvs"; |
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| 356 | |
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| 357 | Debug << endl; |
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[375] | 358 | } |
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[421] | 359 | |
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| 360 | void BspTree::ParseEnvironment() |
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| 361 | { |
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| 362 | //-- parse bsp cell tree construction method |
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| 363 | char constructionMethodStr[60]; |
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| 364 | |
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| 365 | environment->GetStringValue("BspTree.Construction.input", constructionMethodStr); |
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| 366 | |
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| 367 | sConstructionMethod = FROM_INPUT_VIEW_CELLS; |
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| 368 | |
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| 369 | if (strcmp(constructionMethodStr, "fromViewCells") == 0) |
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| 370 | sConstructionMethod = FROM_INPUT_VIEW_CELLS; |
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| 371 | else if (strcmp(constructionMethodStr, "fromSceneGeometry") == 0) |
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| 372 | sConstructionMethod = FROM_SCENE_GEOMETRY; |
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[422] | 373 | else if (strcmp(constructionMethodStr, "fromSamples") == 0) |
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| 374 | sConstructionMethod = FROM_SAMPLES; |
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[421] | 375 | else |
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| 376 | { |
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| 377 | cerr << "Wrong construction method " << constructionMethodStr << endl; |
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| 378 | exit(1); |
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| 379 | } |
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| 380 | |
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| 381 | Debug << "Construction method: " << constructionMethodStr << endl; |
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| 382 | } |
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| 383 | |
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[375] | 384 | const BspTreeStatistics &BspTree::GetStatistics() const |
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| 385 | { |
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| 386 | return mStat; |
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| 387 | } |
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| 388 | |
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| 389 | void BspTreeStatistics::Print(ostream &app) const |
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| 390 | { |
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| 391 | app << "===== BspTree statistics ===============\n"; |
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| 392 | |
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| 393 | app << setprecision(4); |
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| 394 | |
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[414] | 395 | app << "#N_CTIME ( Construction time [s] )\n" << Time() << " \n"; |
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| 396 | |
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[375] | 397 | app << "#N_NODES ( Number of nodes )\n" << nodes << "\n"; |
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| 398 | |
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| 399 | app << "#N_INTERIORS ( Number of interior nodes )\n" << Interior() << "\n"; |
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| 400 | |
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| 401 | app << "#N_LEAVES ( Number of leaves )\n" << Leaves() << "\n"; |
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| 402 | |
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| 403 | app << "#N_SPLITS ( Number of splits )\n" << splits << "\n"; |
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| 404 | |
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[426] | 405 | app << "#N_PMAXDEPTHLEAVES ( Percentage of leaves at maximum depth )\n" |
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| 406 | << maxDepthNodes * 100 / (double)Leaves() << endl; |
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[375] | 407 | |
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[426] | 408 | app << "#N_PMAXDEPTHLEAVES ( Percentage of leaves at maximum depth )\n" |
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| 409 | << maxDepthNodes * 100 / (double)Leaves() << endl; |
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| 410 | |
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| 411 | app << "#N_PMINPVSLEAVES ( Percentage of leaves with mininimal PVS )\n"
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| 412 | << minPvsNodes * 100 / (double)Leaves() << endl;
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| 413 |
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| 414 | app << "#N_PMINRAYSLEAVES ( Percentage of leaves with minimal number of rays)\n"
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| 415 | << minRaysNodes * 100 / (double)Leaves() << endl;
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| 416 |
|
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| 417 | app << "#N_PMINAREALEAVES ( Percentage of leaves with mininum area )\n"
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| 418 | << minAreaNodes * 100 / (double)Leaves() << endl;
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| 419 |
|
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| 420 | app << "#N_PMAXRAYCONTRIBLEAVES ( Percentage of leaves with maximal ray contribution )\n"
|
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| 421 | << maxRayContribNodes * 100 / (double)Leaves() << endl;
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| 422 | |
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[375] | 423 | app << "#N_PMAXDEPTH ( Maximal reached depth )\n" << maxDepth << endl; |
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| 424 | |
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| 425 | app << "#N_PMINDEPTH ( Minimal reached depth )\n" << minDepth << endl; |
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| 426 | |
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| 427 | app << "#AVGDEPTH ( average depth )\n" << AvgDepth() << endl; |
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| 428 | |
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| 429 | app << "#N_INPUT_POLYGONS (number of input polygons )\n" << polys << endl; |
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| 430 | |
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| 431 | //app << "#N_PVS: " << pvs << endl; |
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| 432 | |
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| 433 | app << "#N_ROUTPUT_INPUT_POLYGONS ( ratio polygons after subdivision / input polygons )\n" << |
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| 434 | (polys + splits) / (double)polys << endl; |
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| 435 | |
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| 436 | app << "===== END OF BspTree statistics ==========\n"; |
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| 437 | } |
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| 438 | |
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| 439 | |
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| 440 | BspTree::~BspTree() |
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| 441 | { |
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[411] | 442 | DEL_PTR(mRoot); |
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[375] | 443 | } |
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| 444 | |
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| 445 | void BspTree::InsertViewCell(ViewCell *viewCell) |
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| 446 | { |
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| 447 | PolygonContainer *polys = new PolygonContainer(); |
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| 448 | |
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| 449 | // extract polygons that guide the split process |
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| 450 | mStat.polys += AddMeshToPolygons(viewCell->GetMesh(), *polys, viewCell); |
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| 451 | mBox.Include(viewCell->GetBox()); // add to BSP aabb |
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| 452 | |
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| 453 | InsertPolygons(polys); |
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| 454 | } |
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| 455 | |
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| 456 | void BspTree::InsertPolygons(PolygonContainer *polys) |
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| 457 | { |
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| 458 | std::stack<BspTraversalData> tStack; |
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| 459 | |
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| 460 | // traverse existing tree or create new tree |
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| 461 | if (!mRoot) |
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| 462 | mRoot = new BspLeaf(); |
---|
| 463 | |
---|
[390] | 464 | tStack.push(BspTraversalData(mRoot, polys, 0, mRootCell, new BoundedRayContainer(), 0, |
---|
| 465 | mBox.SurfaceArea(), new BspNodeGeometry())); |
---|
[375] | 466 | |
---|
| 467 | while (!tStack.empty()) |
---|
| 468 | { |
---|
| 469 | // filter polygons donw the tree |
---|
| 470 | BspTraversalData tData = tStack.top(); |
---|
| 471 | tStack.pop(); |
---|
| 472 | |
---|
| 473 | if (!tData.mNode->IsLeaf()) |
---|
| 474 | { |
---|
| 475 | BspInterior *interior = dynamic_cast<BspInterior *>(tData.mNode); |
---|
| 476 | |
---|
| 477 | //-- filter view cell polygons down the tree until a leaf is reached |
---|
| 478 | if (!tData.mPolygons->empty()) |
---|
| 479 | { |
---|
| 480 | PolygonContainer *frontPolys = new PolygonContainer(); |
---|
| 481 | PolygonContainer *backPolys = new PolygonContainer(); |
---|
| 482 | PolygonContainer coincident; |
---|
| 483 | |
---|
| 484 | int splits = 0; |
---|
| 485 | |
---|
| 486 | // split viewcell polygons with respect to split plane |
---|
[390] | 487 | splits += interior->SplitPolygons(*tData.mPolygons, |
---|
[375] | 488 | *frontPolys, |
---|
| 489 | *backPolys, |
---|
[390] | 490 | coincident); |
---|
[375] | 491 | |
---|
| 492 | // extract view cells associated with the split polygons |
---|
| 493 | ViewCell *frontViewCell = mRootCell; |
---|
| 494 | ViewCell *backViewCell = mRootCell; |
---|
[390] | 495 | |
---|
| 496 | BspTraversalData frontData(interior->GetFront(), |
---|
| 497 | frontPolys, |
---|
| 498 | tData.mDepth + 1, |
---|
| 499 | mRootCell, |
---|
| 500 | tData.mRays, |
---|
| 501 | tData.mPvs, |
---|
| 502 | mBox.SurfaceArea(), |
---|
| 503 | new BspNodeGeometry()); |
---|
| 504 | |
---|
| 505 | BspTraversalData backData(interior->GetBack(), |
---|
| 506 | backPolys, |
---|
| 507 | tData.mDepth + 1, |
---|
| 508 | mRootCell, |
---|
| 509 | tData.mRays, |
---|
| 510 | tData.mPvs, |
---|
| 511 | mBox.SurfaceArea(), |
---|
| 512 | new BspNodeGeometry()); |
---|
| 513 | |
---|
[375] | 514 | if (!mGenerateViewCells) |
---|
| 515 | { |
---|
[390] | 516 | ExtractViewCells(frontData, |
---|
| 517 | backData, |
---|
| 518 | coincident, |
---|
| 519 | interior->mPlane); |
---|
[375] | 520 | } |
---|
| 521 | |
---|
| 522 | // don't need coincident polygons anymore |
---|
[390] | 523 | CLEAR_CONTAINER(coincident); |
---|
[375] | 524 | |
---|
| 525 | mStat.splits += splits; |
---|
| 526 | |
---|
| 527 | // push the children on the stack |
---|
[390] | 528 | tStack.push(frontData); |
---|
| 529 | tStack.push(backData); |
---|
[375] | 530 | } |
---|
| 531 | |
---|
| 532 | // cleanup |
---|
| 533 | DEL_PTR(tData.mPolygons); |
---|
| 534 | } |
---|
| 535 | else |
---|
| 536 | { |
---|
| 537 | // reached leaf => subdivide current viewcell |
---|
| 538 | BspNode *subRoot = Subdivide(tStack, tData); |
---|
| 539 | } |
---|
| 540 | } |
---|
| 541 | } |
---|
| 542 | |
---|
| 543 | int BspTree::AddMeshToPolygons(Mesh *mesh, PolygonContainer &polys, MeshInstance *parent) |
---|
| 544 | { |
---|
| 545 | FaceContainer::const_iterator fi; |
---|
| 546 | |
---|
| 547 | // copy the face data to polygons |
---|
| 548 | for (fi = mesh->mFaces.begin(); fi != mesh->mFaces.end(); ++ fi) |
---|
| 549 | { |
---|
| 550 | Polygon3 *poly = new Polygon3((*fi), mesh); |
---|
| 551 | |
---|
| 552 | if (poly->Valid()) |
---|
| 553 | { |
---|
| 554 | poly->mParent = parent; // set parent intersectable |
---|
| 555 | polys.push_back(poly); |
---|
| 556 | } |
---|
| 557 | else |
---|
| 558 | DEL_PTR(poly); |
---|
| 559 | } |
---|
| 560 | return (int)mesh->mFaces.size(); |
---|
| 561 | } |
---|
| 562 | |
---|
| 563 | int BspTree::AddToPolygonSoup(const ViewCellContainer &viewCells, |
---|
| 564 | PolygonContainer &polys, |
---|
| 565 | int maxObjects) |
---|
| 566 | { |
---|
| 567 | int limit = (maxObjects > 0) ? |
---|
| 568 | Min((int)viewCells.size(), maxObjects) : (int)viewCells.size(); |
---|
| 569 | |
---|
| 570 | int polysSize = 0; |
---|
| 571 | |
---|
| 572 | for (int i = 0; i < limit; ++ i) |
---|
| 573 | { |
---|
| 574 | if (viewCells[i]->GetMesh()) // copy the mesh data to polygons |
---|
| 575 | { |
---|
| 576 | mBox.Include(viewCells[i]->GetBox()); // add to BSP tree aabb |
---|
| 577 | polysSize += AddMeshToPolygons(viewCells[i]->GetMesh(), polys, viewCells[i]); |
---|
| 578 | } |
---|
| 579 | } |
---|
| 580 | |
---|
| 581 | return polysSize; |
---|
| 582 | } |
---|
| 583 | |
---|
| 584 | int BspTree::AddToPolygonSoup(const ObjectContainer &objects, PolygonContainer &polys, int maxObjects) |
---|
| 585 | { |
---|
| 586 | int limit = (maxObjects > 0) ? Min((int)objects.size(), maxObjects) : (int)objects.size(); |
---|
| 587 | |
---|
| 588 | for (int i = 0; i < limit; ++i) |
---|
| 589 | { |
---|
| 590 | Intersectable *object = objects[i];//*it; |
---|
| 591 | Mesh *mesh = NULL; |
---|
| 592 | |
---|
| 593 | switch (object->Type()) // extract the meshes |
---|
| 594 | { |
---|
| 595 | case Intersectable::MESH_INSTANCE: |
---|
| 596 | mesh = dynamic_cast<MeshInstance *>(object)->GetMesh(); |
---|
| 597 | break; |
---|
| 598 | case Intersectable::VIEW_CELL: |
---|
| 599 | mesh = dynamic_cast<ViewCell *>(object)->GetMesh(); |
---|
| 600 | break; |
---|
| 601 | // TODO: handle transformed mesh instances |
---|
| 602 | default: |
---|
| 603 | Debug << "intersectable type not supported" << endl; |
---|
| 604 | break; |
---|
| 605 | } |
---|
| 606 | |
---|
| 607 | if (mesh) // copy the mesh data to polygons |
---|
| 608 | { |
---|
| 609 | mBox.Include(object->GetBox()); // add to BSP tree aabb |
---|
| 610 | AddMeshToPolygons(mesh, polys, mRootCell); |
---|
| 611 | } |
---|
| 612 | } |
---|
| 613 | |
---|
| 614 | return (int)polys.size(); |
---|
| 615 | } |
---|
| 616 | |
---|
| 617 | void BspTree::Construct(const ViewCellContainer &viewCells) |
---|
| 618 | { |
---|
| 619 | mStat.nodes = 1; |
---|
| 620 | mBox.Initialize(); // initialise bsp tree bounding box |
---|
| 621 | |
---|
| 622 | // copy view cell meshes into one big polygon soup |
---|
| 623 | PolygonContainer *polys = new PolygonContainer(); |
---|
| 624 | mStat.polys = AddToPolygonSoup(viewCells, *polys); |
---|
| 625 | |
---|
| 626 | // construct tree from the view cell polygons |
---|
| 627 | Construct(polys, new BoundedRayContainer()); |
---|
| 628 | } |
---|
| 629 | |
---|
| 630 | |
---|
| 631 | void BspTree::Construct(const ObjectContainer &objects) |
---|
| 632 | { |
---|
| 633 | mStat.nodes = 1; |
---|
| 634 | mBox.Initialize(); // initialise bsp tree bounding box |
---|
| 635 | |
---|
| 636 | PolygonContainer *polys = new PolygonContainer(); |
---|
| 637 | |
---|
| 638 | // copy mesh instance polygons into one big polygon soup |
---|
| 639 | mStat.polys = AddToPolygonSoup(objects, *polys); |
---|
| 640 | |
---|
| 641 | // construct tree from polygon soup |
---|
| 642 | Construct(polys, new BoundedRayContainer()); |
---|
| 643 | } |
---|
| 644 | |
---|
| 645 | void BspTree::Construct(const RayContainer &sampleRays) |
---|
| 646 | { |
---|
[414] | 647 | mStat.nodes = 1; |
---|
[375] | 648 | mBox.Initialize(); // initialise BSP tree bounding box |
---|
| 649 | |
---|
| 650 | PolygonContainer *polys = new PolygonContainer(); |
---|
| 651 | BoundedRayContainer *rays = new BoundedRayContainer(); |
---|
| 652 | |
---|
| 653 | RayContainer::const_iterator rit, rit_end = sampleRays.end(); |
---|
| 654 | |
---|
| 655 | long startTime = GetTime(); |
---|
| 656 | |
---|
| 657 | Debug << "**** Extracting polygons from rays ****\n"; |
---|
| 658 | |
---|
| 659 | std::map<Face *, Polygon3 *> facePolyMap; |
---|
| 660 | |
---|
| 661 | //-- extract polygons intersected by the rays |
---|
| 662 | for (rit = sampleRays.begin(); rit != rit_end; ++ rit) |
---|
| 663 | { |
---|
| 664 | Ray *ray = *rit; |
---|
| 665 | |
---|
| 666 | // get ray-face intersection. Store polygon representing the rays together |
---|
| 667 | // with rays intersecting the face. |
---|
| 668 | if (!ray->intersections.empty()) |
---|
| 669 | { |
---|
| 670 | MeshInstance *obj = dynamic_cast<MeshInstance *>(ray->intersections[0].mObject); |
---|
| 671 | Face *face = obj->GetMesh()->mFaces[ray->intersections[0].mFace]; |
---|
| 672 | |
---|
| 673 | std::map<Face *, Polygon3 *>::iterator it = facePolyMap.find(face); |
---|
| 674 | |
---|
| 675 | if (it != facePolyMap.end()) |
---|
| 676 | { |
---|
| 677 | //store rays if needed for heuristics |
---|
[420] | 678 | if (mSplitPlaneStrategy & BLOCKED_RAYS) |
---|
[375] | 679 | (*it).second->mPiercingRays.push_back(ray); |
---|
| 680 | } |
---|
| 681 | else |
---|
| 682 | { //store rays if needed for heuristics |
---|
| 683 | Polygon3 *poly = new Polygon3(face, obj->GetMesh()); |
---|
| 684 | poly->mParent = obj; |
---|
| 685 | polys->push_back(poly); |
---|
| 686 | |
---|
[420] | 687 | if (mSplitPlaneStrategy & BLOCKED_RAYS) |
---|
[375] | 688 | poly->mPiercingRays.push_back(ray); |
---|
| 689 | |
---|
| 690 | facePolyMap[face] = poly; |
---|
| 691 | } |
---|
| 692 | } |
---|
| 693 | } |
---|
| 694 | |
---|
| 695 | facePolyMap.clear(); |
---|
| 696 | |
---|
[436] | 697 | // compute bounding box |
---|
[375] | 698 | Polygon3::IncludeInBox(*polys, mBox); |
---|
| 699 | |
---|
| 700 | //-- store rays |
---|
| 701 | for (rit = sampleRays.begin(); rit != rit_end; ++ rit) |
---|
| 702 | { |
---|
| 703 | Ray *ray = *rit; |
---|
| 704 | ray->SetId(-1); // reset id |
---|
| 705 | |
---|
| 706 | float minT, maxT; |
---|
| 707 | if (BoundRay(*ray, minT, maxT)) |
---|
| 708 | rays->push_back(new BoundedRay(ray, minT, maxT)); |
---|
| 709 | } |
---|
| 710 | |
---|
| 711 | mStat.polys = (int)polys->size(); |
---|
| 712 | |
---|
| 713 | Debug << "**** Finished polygon extraction ****" << endl; |
---|
[380] | 714 | Debug << (int)polys->size() << " polys extracted from " << (int)sampleRays.size() << " rays" << endl; |
---|
[375] | 715 | Debug << "extraction time: " << TimeDiff(startTime, GetTime())*1e-3 << "s" << endl; |
---|
| 716 | |
---|
| 717 | Construct(polys, rays); |
---|
| 718 | } |
---|
| 719 | |
---|
[436] | 720 | void BspTree::Construct(const ObjectContainer &objects, const RayContainer &sampleRays) |
---|
| 721 | { |
---|
| 722 | mStat.nodes = 1; |
---|
| 723 | mBox.Initialize(); // initialise BSP tree bounding box |
---|
| 724 | |
---|
| 725 | BoundedRayContainer *rays = new BoundedRayContainer(); |
---|
| 726 | PolygonContainer *polys = new PolygonContainer(); |
---|
| 727 | |
---|
| 728 | // copy mesh instance polygons into one big polygon soup |
---|
| 729 | mStat.polys = AddToPolygonSoup(objects, *polys); |
---|
| 730 | |
---|
| 731 | RayContainer::const_iterator rit, rit_end = sampleRays.end(); |
---|
| 732 | |
---|
| 733 | //-- store rays |
---|
| 734 | for (rit = sampleRays.begin(); rit != rit_end; ++ rit) |
---|
| 735 | { |
---|
| 736 | Ray *ray = *rit; |
---|
| 737 | ray->SetId(-1); // reset id |
---|
| 738 | |
---|
| 739 | float minT, maxT; |
---|
| 740 | if (BoundRay(*ray, minT, maxT)) |
---|
| 741 | rays->push_back(new BoundedRay(ray, minT, maxT)); |
---|
| 742 | } |
---|
| 743 | |
---|
| 744 | Debug << "tree has " << (int)polys->size() << " polys, " << (int)sampleRays.size() << " rays" << endl; |
---|
| 745 | Construct(polys, rays); |
---|
| 746 | } |
---|
| 747 | |
---|
[375] | 748 | void BspTree::Construct(PolygonContainer *polys, BoundedRayContainer *rays) |
---|
| 749 | { |
---|
| 750 | std::stack<BspTraversalData> tStack; |
---|
| 751 | |
---|
| 752 | mRoot = new BspLeaf(); |
---|
| 753 | |
---|
[390] | 754 | BspNodeGeometry *cell = new BspNodeGeometry(); |
---|
| 755 | ConstructGeometry(mRoot, *cell); |
---|
| 756 | |
---|
| 757 | BspTraversalData tData(mRoot, polys, 0, mRootCell, rays, |
---|
| 758 | ComputePvsSize(*rays), cell->GetArea(), cell); |
---|
| 759 | |
---|
[375] | 760 | tStack.push(tData); |
---|
| 761 | |
---|
[414] | 762 | mStat.Start(); |
---|
[436] | 763 | cout << "Contructing bsp tree ... "; |
---|
| 764 | long startTime = GetTime(); |
---|
[375] | 765 | while (!tStack.empty()) |
---|
| 766 | { |
---|
| 767 | tData = tStack.top(); |
---|
[436] | 768 | |
---|
[375] | 769 | tStack.pop(); |
---|
| 770 | |
---|
| 771 | // subdivide leaf node |
---|
[436] | 772 | BspNode *r = Subdivide(tStack, tData); |
---|
| 773 | |
---|
| 774 | if (r == mRoot) |
---|
| 775 | Debug << "BSP tree construction time spent at root: " << TimeDiff(startTime, GetTime())*1e-3 << "s" << endl; |
---|
[375] | 776 | } |
---|
| 777 | |
---|
[436] | 778 | cout << "finished\n"; |
---|
| 779 | |
---|
[414] | 780 | mStat.Stop(); |
---|
[375] | 781 | } |
---|
| 782 | |
---|
[420] | 783 | bool BspTree::TerminationCriteriaMet(const BspTraversalData &data) const |
---|
[397] | 784 | { |
---|
| 785 | return |
---|
[426] | 786 | (((int)data.mPolygons->size() <= mTermMinPolys) || |
---|
| 787 | ((int)data.mRays->size() <= mTermMinRays) || |
---|
[420] | 788 | (data.mPvs <= mTermMinPvs) || |
---|
| 789 | (data.mArea <= mTermMinArea) || |
---|
| 790 | (data.mDepth >= mTermMaxDepth) || |
---|
[423] | 791 | (data.GetAvgRayContribution() < mTermMaxRayContribution)); |
---|
[397] | 792 | } |
---|
[375] | 793 | |
---|
| 794 | BspNode *BspTree::Subdivide(BspTraversalStack &tStack, BspTraversalData &tData) |
---|
| 795 | { |
---|
| 796 | //-- terminate traversal |
---|
[397] | 797 | if (TerminationCriteriaMet(tData)) |
---|
[375] | 798 | { |
---|
| 799 | BspLeaf *leaf = dynamic_cast<BspLeaf *>(tData.mNode); |
---|
| 800 | |
---|
[392] | 801 | BspViewCell *viewCell; |
---|
| 802 | |
---|
[375] | 803 | // generate new view cell for each leaf |
---|
| 804 | if (mGenerateViewCells) |
---|
| 805 | { |
---|
[392] | 806 | viewCell = dynamic_cast<BspViewCell *>(ViewCell::Generate()); |
---|
[375] | 807 | } |
---|
| 808 | else |
---|
| 809 | { |
---|
| 810 | // add view cell to leaf |
---|
[392] | 811 | viewCell = dynamic_cast<BspViewCell *>(tData.mViewCell); |
---|
[375] | 812 | } |
---|
| 813 | |
---|
[392] | 814 | leaf->SetViewCell(viewCell); |
---|
| 815 | viewCell->mBspLeaves.push_back(leaf); |
---|
| 816 | |
---|
| 817 | //-- add pvs |
---|
| 818 | if (viewCell != mRootCell) |
---|
| 819 | { |
---|
| 820 | int conSamp = 0, sampCon = 0; |
---|
| 821 | leaf->AddToPvs(*tData.mRays, conSamp, sampCon); |
---|
| 822 | |
---|
| 823 | mStat.contributingSamples += conSamp; |
---|
| 824 | mStat.sampleContributions += sampCon; |
---|
| 825 | } |
---|
| 826 | |
---|
[375] | 827 | EvaluateLeafStats(tData); |
---|
| 828 | |
---|
| 829 | //-- clean up |
---|
| 830 | |
---|
[390] | 831 | // discard polygons |
---|
| 832 | CLEAR_CONTAINER(*tData.mPolygons); |
---|
[375] | 833 | // discard rays |
---|
| 834 | CLEAR_CONTAINER(*tData.mRays); |
---|
[390] | 835 | |
---|
| 836 | DEL_PTR(tData.mPolygons); |
---|
[375] | 837 | DEL_PTR(tData.mRays); |
---|
[400] | 838 | DEL_PTR(tData.mGeometry); |
---|
[390] | 839 | |
---|
[375] | 840 | return leaf; |
---|
| 841 | } |
---|
| 842 | |
---|
| 843 | //-- continue subdivision |
---|
| 844 | PolygonContainer coincident; |
---|
| 845 | |
---|
| 846 | PolygonContainer *frontPolys = new PolygonContainer(); |
---|
| 847 | PolygonContainer *backPolys = new PolygonContainer(); |
---|
| 848 | |
---|
| 849 | BoundedRayContainer *frontRays = new BoundedRayContainer(); |
---|
| 850 | BoundedRayContainer *backRays = new BoundedRayContainer(); |
---|
| 851 | |
---|
[390] | 852 | BspTraversalData tFrontData(NULL, new PolygonContainer(), tData.mDepth + 1, mRootCell, |
---|
[400] | 853 | new BoundedRayContainer(), 0, 0, new BspNodeGeometry()); |
---|
[390] | 854 | BspTraversalData tBackData(NULL, new PolygonContainer(), tData.mDepth + 1, mRootCell, |
---|
[400] | 855 | new BoundedRayContainer(), 0, 0, new BspNodeGeometry()); |
---|
[390] | 856 | |
---|
[375] | 857 | // create new interior node and two leaf nodes |
---|
[390] | 858 | BspInterior *interior = SubdivideNode(tData, |
---|
| 859 | tFrontData, |
---|
| 860 | tBackData, |
---|
| 861 | coincident); |
---|
[375] | 862 | |
---|
| 863 | #ifdef _DEBUG |
---|
| 864 | if (frontPolys->empty() && backPolys->empty() && (coincident.size() > 2)) |
---|
| 865 | { for (PolygonContainer::iterator it = coincident.begin(); it != coincident.end(); ++it) |
---|
| 866 | Debug << (*it) << " " << (*it)->GetArea() << " " << (*it)->mParent << endl ; |
---|
| 867 | Debug << endl;} |
---|
| 868 | #endif |
---|
| 869 | |
---|
| 870 | // extract view cells from coincident polygons according to plane normal |
---|
| 871 | // only if front or back polygons are empty |
---|
| 872 | if (!mGenerateViewCells) |
---|
| 873 | { |
---|
[390] | 874 | ExtractViewCells(tFrontData, |
---|
| 875 | tBackData, |
---|
[375] | 876 | coincident, |
---|
[422] | 877 | interior->mPlane); |
---|
[375] | 878 | } |
---|
| 879 | |
---|
[390] | 880 | // don't need coincident polygons anymory |
---|
| 881 | CLEAR_CONTAINER(coincident); |
---|
| 882 | |
---|
[375] | 883 | // push the children on the stack |
---|
[390] | 884 | tStack.push(tFrontData); |
---|
| 885 | tStack.push(tBackData); |
---|
[375] | 886 | |
---|
| 887 | // cleanup |
---|
| 888 | DEL_PTR(tData.mNode); |
---|
| 889 | DEL_PTR(tData.mPolygons); |
---|
| 890 | DEL_PTR(tData.mRays); |
---|
[400] | 891 | DEL_PTR(tData.mGeometry); |
---|
[375] | 892 | |
---|
| 893 | return interior; |
---|
| 894 | } |
---|
| 895 | |
---|
[390] | 896 | void BspTree::ExtractViewCells(BspTraversalData &frontData, |
---|
| 897 | BspTraversalData &backData, |
---|
[375] | 898 | const PolygonContainer &coincident, |
---|
[390] | 899 | const Plane3 splitPlane) const |
---|
[375] | 900 | { |
---|
[390] | 901 | // if not empty, tree is further subdivided => don't have to find view cell |
---|
| 902 | bool foundFront = !frontData.mPolygons->empty(); |
---|
| 903 | bool foundBack = !frontData.mPolygons->empty(); |
---|
[375] | 904 | |
---|
| 905 | PolygonContainer::const_iterator it = |
---|
| 906 | coincident.begin(), it_end = coincident.end(); |
---|
| 907 | |
---|
| 908 | //-- find first view cells in front and back leafs |
---|
| 909 | for (; !(foundFront && foundBack) && (it != it_end); ++ it) |
---|
| 910 | { |
---|
| 911 | if (DotProd((*it)->GetNormal(), splitPlane.mNormal) > 0) |
---|
| 912 | { |
---|
[390] | 913 | backData.mViewCell = dynamic_cast<ViewCell *>((*it)->mParent); |
---|
[375] | 914 | foundBack = true; |
---|
| 915 | } |
---|
| 916 | else |
---|
| 917 | { |
---|
[390] | 918 | frontData.mViewCell = dynamic_cast<ViewCell *>((*it)->mParent); |
---|
[375] | 919 | foundFront = true; |
---|
| 920 | } |
---|
| 921 | } |
---|
| 922 | } |
---|
| 923 | |
---|
[390] | 924 | BspInterior *BspTree::SubdivideNode(BspTraversalData &tData, |
---|
| 925 | BspTraversalData &frontData, |
---|
| 926 | BspTraversalData &backData, |
---|
| 927 | PolygonContainer &coincident) |
---|
[375] | 928 | { |
---|
| 929 | mStat.nodes += 2; |
---|
| 930 | |
---|
[390] | 931 | BspLeaf *leaf = dynamic_cast<BspLeaf *>(tData.mNode); |
---|
[375] | 932 | // select subdivision plane |
---|
| 933 | BspInterior *interior = |
---|
[400] | 934 | new BspInterior(SelectPlane(leaf, tData)); |
---|
[375] | 935 | |
---|
| 936 | #ifdef _DEBUG |
---|
| 937 | Debug << interior << endl; |
---|
| 938 | #endif |
---|
| 939 | |
---|
| 940 | // subdivide rays into front and back rays |
---|
[390] | 941 | SplitRays(interior->mPlane, *tData.mRays, *frontData.mRays, *backData.mRays); |
---|
[375] | 942 | |
---|
| 943 | // subdivide polygons with plane |
---|
[390] | 944 | mStat.splits += interior->SplitPolygons(*tData.mPolygons, |
---|
| 945 | *frontData.mPolygons, |
---|
| 946 | *backData.mPolygons, |
---|
| 947 | coincident); |
---|
[375] | 948 | |
---|
[409] | 949 | // compute pvs |
---|
[400] | 950 | frontData.mPvs = ComputePvsSize(*frontData.mRays); |
---|
| 951 | backData.mPvs = ComputePvsSize(*backData.mRays); |
---|
| 952 | |
---|
[409] | 953 | // split geometry and compute area |
---|
| 954 | if (1) |
---|
| 955 | { |
---|
| 956 | tData.mGeometry->SplitGeometry(*frontData.mGeometry, |
---|
| 957 | *backData.mGeometry, |
---|
| 958 | *this, |
---|
| 959 | interior->mPlane); |
---|
| 960 | |
---|
| 961 | |
---|
| 962 | frontData.mArea = frontData.mGeometry->GetArea(); |
---|
| 963 | backData.mArea = backData.mGeometry->GetArea(); |
---|
| 964 | } |
---|
[400] | 965 | |
---|
[409] | 966 | // compute accumulated ray length |
---|
| 967 | //frontData.mAccRayLength = AccumulatedRayLength(*frontData.mRays); |
---|
| 968 | //backData.mAccRayLength = AccumulatedRayLength(*backData.mRays); |
---|
| 969 | |
---|
[404] | 970 | //-- create front and back leaf |
---|
[400] | 971 | |
---|
[375] | 972 | BspInterior *parent = leaf->GetParent(); |
---|
| 973 | |
---|
| 974 | // replace a link from node's parent |
---|
| 975 | if (!leaf->IsRoot()) |
---|
| 976 | { |
---|
| 977 | parent->ReplaceChildLink(leaf, interior); |
---|
| 978 | interior->SetParent(parent); |
---|
| 979 | } |
---|
| 980 | else // new root |
---|
| 981 | { |
---|
| 982 | mRoot = interior; |
---|
| 983 | } |
---|
| 984 | |
---|
| 985 | // and setup child links |
---|
| 986 | interior->SetupChildLinks(new BspLeaf(interior), new BspLeaf(interior)); |
---|
| 987 | |
---|
[390] | 988 | frontData.mNode = interior->mFront; |
---|
| 989 | backData.mNode = interior->mBack; |
---|
| 990 | |
---|
[414] | 991 | //DEL_PTR(leaf); |
---|
[375] | 992 | return interior; |
---|
| 993 | } |
---|
| 994 | |
---|
| 995 | void BspTree::SortSplitCandidates(const PolygonContainer &polys, |
---|
| 996 | const int axis, |
---|
| 997 | vector<SortableEntry> &splitCandidates) const |
---|
| 998 | { |
---|
| 999 | splitCandidates.clear(); |
---|
| 1000 | |
---|
| 1001 | int requestedSize = 2 * (int)polys.size(); |
---|
| 1002 | // creates a sorted split candidates array |
---|
| 1003 | splitCandidates.reserve(requestedSize); |
---|
| 1004 | |
---|
| 1005 | PolygonContainer::const_iterator it, it_end = polys.end(); |
---|
| 1006 | |
---|
| 1007 | AxisAlignedBox3 box; |
---|
| 1008 | |
---|
| 1009 | // insert all queries |
---|
| 1010 | for(it = polys.begin(); it != it_end; ++ it) |
---|
| 1011 | { |
---|
| 1012 | box.Initialize(); |
---|
| 1013 | box.Include(*(*it)); |
---|
| 1014 | |
---|
| 1015 | splitCandidates.push_back(SortableEntry(SortableEntry::POLY_MIN, box.Min(axis), *it)); |
---|
| 1016 | splitCandidates.push_back(SortableEntry(SortableEntry::POLY_MAX, box.Max(axis), *it)); |
---|
| 1017 | } |
---|
| 1018 | |
---|
| 1019 | stable_sort(splitCandidates.begin(), splitCandidates.end()); |
---|
| 1020 | } |
---|
| 1021 | |
---|
| 1022 | |
---|
| 1023 | float BspTree::BestCostRatio(const PolygonContainer &polys, |
---|
| 1024 | const AxisAlignedBox3 &box, |
---|
| 1025 | const int axis, |
---|
| 1026 | float &position, |
---|
| 1027 | int &objectsBack, |
---|
| 1028 | int &objectsFront) const |
---|
| 1029 | { |
---|
| 1030 | vector<SortableEntry> splitCandidates; |
---|
| 1031 | |
---|
| 1032 | SortSplitCandidates(polys, axis, splitCandidates); |
---|
| 1033 | |
---|
| 1034 | // go through the lists, count the number of objects left and right |
---|
| 1035 | // and evaluate the following cost funcion: |
---|
| 1036 | // C = ct_div_ci + (ol + or)/queries |
---|
| 1037 | |
---|
| 1038 | int objectsLeft = 0, objectsRight = (int)polys.size(); |
---|
| 1039 | |
---|
| 1040 | float minBox = box.Min(axis); |
---|
| 1041 | float maxBox = box.Max(axis); |
---|
| 1042 | float boxArea = box.SurfaceArea(); |
---|
| 1043 | |
---|
[420] | 1044 | float minBand = minBox + mSplitBorder * (maxBox - minBox); |
---|
| 1045 | float maxBand = minBox + (1.0f - mSplitBorder) * (maxBox - minBox); |
---|
[375] | 1046 | |
---|
| 1047 | float minSum = 1e20f; |
---|
| 1048 | vector<SortableEntry>::const_iterator ci, ci_end = splitCandidates.end(); |
---|
| 1049 | |
---|
| 1050 | for(ci = splitCandidates.begin(); ci != ci_end; ++ ci) |
---|
| 1051 | { |
---|
| 1052 | switch ((*ci).type) |
---|
| 1053 | { |
---|
| 1054 | case SortableEntry::POLY_MIN: |
---|
| 1055 | ++ objectsLeft; |
---|
| 1056 | break; |
---|
| 1057 | case SortableEntry::POLY_MAX: |
---|
| 1058 | -- objectsRight; |
---|
| 1059 | break; |
---|
| 1060 | default: |
---|
| 1061 | break; |
---|
| 1062 | } |
---|
| 1063 | |
---|
| 1064 | if ((*ci).value > minBand && (*ci).value < maxBand) |
---|
| 1065 | { |
---|
| 1066 | AxisAlignedBox3 lbox = box; |
---|
| 1067 | AxisAlignedBox3 rbox = box; |
---|
| 1068 | lbox.SetMax(axis, (*ci).value); |
---|
| 1069 | rbox.SetMin(axis, (*ci).value); |
---|
| 1070 | |
---|
| 1071 | float sum = objectsLeft * lbox.SurfaceArea() + |
---|
| 1072 | objectsRight * rbox.SurfaceArea(); |
---|
| 1073 | |
---|
| 1074 | if (sum < minSum) |
---|
| 1075 | { |
---|
| 1076 | minSum = sum; |
---|
| 1077 | position = (*ci).value; |
---|
| 1078 | |
---|
| 1079 | objectsBack = objectsLeft; |
---|
| 1080 | objectsFront = objectsRight; |
---|
| 1081 | } |
---|
| 1082 | } |
---|
| 1083 | } |
---|
| 1084 | |
---|
| 1085 | float oldCost = (float)polys.size(); |
---|
[424] | 1086 | float newCost = mAaCtDivCi + minSum / boxArea; |
---|
[375] | 1087 | float ratio = newCost / oldCost; |
---|
| 1088 | |
---|
| 1089 | |
---|
| 1090 | #if 0 |
---|
| 1091 | Debug << "====================" << endl; |
---|
| 1092 | Debug << "costRatio=" << ratio << " pos=" << position<<" t=" << (position - minBox)/(maxBox - minBox) |
---|
| 1093 | << "\t o=(" << objectsBack << "," << objectsFront << ")" << endl; |
---|
| 1094 | #endif |
---|
| 1095 | return ratio; |
---|
| 1096 | } |
---|
| 1097 | |
---|
| 1098 | bool BspTree::SelectAxisAlignedPlane(Plane3 &plane, |
---|
| 1099 | const PolygonContainer &polys) const |
---|
| 1100 | { |
---|
| 1101 | AxisAlignedBox3 box; |
---|
| 1102 | box.Initialize(); |
---|
| 1103 | |
---|
| 1104 | // create bounding box of region |
---|
| 1105 | Polygon3::IncludeInBox(polys, box); |
---|
| 1106 | |
---|
| 1107 | int objectsBack = 0, objectsFront = 0; |
---|
| 1108 | int axis = 0; |
---|
| 1109 | float costRatio = MAX_FLOAT; |
---|
| 1110 | Vector3 position; |
---|
| 1111 | |
---|
| 1112 | //-- area subdivision |
---|
| 1113 | for (int i = 0; i < 3; ++ i) |
---|
| 1114 | { |
---|
| 1115 | float p = 0; |
---|
| 1116 | float r = BestCostRatio(polys, box, i, p, objectsBack, objectsFront); |
---|
| 1117 | |
---|
| 1118 | if (r < costRatio) |
---|
| 1119 | { |
---|
| 1120 | costRatio = r; |
---|
| 1121 | axis = i; |
---|
| 1122 | position = p; |
---|
| 1123 | } |
---|
| 1124 | } |
---|
| 1125 | |
---|
[420] | 1126 | if (costRatio >= mMaxCostRatio) |
---|
[375] | 1127 | return false; |
---|
| 1128 | |
---|
| 1129 | Vector3 norm(0,0,0); norm[axis] = 1.0f; |
---|
| 1130 | plane = Plane3(norm, position); |
---|
| 1131 | |
---|
| 1132 | return true; |
---|
| 1133 | } |
---|
| 1134 | |
---|
[406] | 1135 | Plane3 BspTree::SelectPlane(BspLeaf *leaf, BspTraversalData &data) |
---|
[375] | 1136 | { |
---|
[390] | 1137 | if (data.mPolygons->empty() && data.mRays->empty()) |
---|
[375] | 1138 | { |
---|
| 1139 | Debug << "Warning: No autopartition polygon candidate available\n"; |
---|
| 1140 | |
---|
| 1141 | // return axis aligned split |
---|
| 1142 | AxisAlignedBox3 box; |
---|
| 1143 | box.Initialize(); |
---|
| 1144 | |
---|
| 1145 | // create bounding box of region |
---|
[390] | 1146 | Polygon3::IncludeInBox(*data.mPolygons, box); |
---|
[375] | 1147 | |
---|
| 1148 | const int axis = box.Size().DrivingAxis(); |
---|
| 1149 | const Vector3 position = (box.Min()[axis] + box.Max()[axis])*0.5f; |
---|
| 1150 | |
---|
| 1151 | Vector3 norm(0,0,0); norm[axis] = 1.0f; |
---|
| 1152 | return Plane3(norm, position); |
---|
| 1153 | } |
---|
| 1154 | |
---|
[420] | 1155 | if ((mSplitPlaneStrategy & AXIS_ALIGNED) && |
---|
[426] | 1156 | ((int)data.mPolygons->size() > mTermMinPolysForAxisAligned) && |
---|
| 1157 | ((int)data.mRays->size() > mTermMinRaysForAxisAligned) && |
---|
| 1158 | ((mTermMinObjectsForAxisAligned < 0) || |
---|
| 1159 | (Polygon3::ParentObjectsSize(*data.mPolygons) > mTermMinObjectsForAxisAligned))) |
---|
[375] | 1160 | { |
---|
| 1161 | Plane3 plane; |
---|
[390] | 1162 | if (SelectAxisAlignedPlane(plane, *data.mPolygons)) |
---|
[375] | 1163 | return plane; |
---|
| 1164 | } |
---|
| 1165 | |
---|
| 1166 | // simplest strategy: just take next polygon |
---|
[420] | 1167 | if (mSplitPlaneStrategy & RANDOM_POLYGON) |
---|
[375] | 1168 | { |
---|
[406] | 1169 | if (!data.mPolygons->empty()) |
---|
[397] | 1170 | { |
---|
| 1171 | Polygon3 *nextPoly = (*data.mPolygons)[Random((int)data.mPolygons->size())]; |
---|
| 1172 | return nextPoly->GetSupportingPlane(); |
---|
| 1173 | } |
---|
[406] | 1174 | else |
---|
| 1175 | { |
---|
| 1176 | const int candidateIdx = Random((int)data.mRays->size()); |
---|
| 1177 | BoundedRay *bRay = (*data.mRays)[candidateIdx]; |
---|
| 1178 | |
---|
| 1179 | Ray *ray = bRay->mRay; |
---|
| 1180 | |
---|
| 1181 | const Vector3 minPt = ray->Extrap(bRay->mMinT); |
---|
| 1182 | const Vector3 maxPt = ray->Extrap(bRay->mMaxT); |
---|
| 1183 | |
---|
| 1184 | const Vector3 pt = (maxPt + minPt) * 0.5; |
---|
| 1185 | |
---|
| 1186 | const Vector3 normal = ray->GetDir(); |
---|
| 1187 | |
---|
| 1188 | return Plane3(normal, pt); |
---|
| 1189 | } |
---|
| 1190 | |
---|
[397] | 1191 | return Plane3(); |
---|
[375] | 1192 | } |
---|
| 1193 | |
---|
| 1194 | // use heuristics to find appropriate plane |
---|
[400] | 1195 | return SelectPlaneHeuristics(leaf, data); |
---|
[375] | 1196 | } |
---|
| 1197 | |
---|
[406] | 1198 | Plane3 BspTree::SelectPlaneHeuristics(BspLeaf *leaf, BspTraversalData &data) |
---|
[375] | 1199 | { |
---|
| 1200 | float lowestCost = MAX_FLOAT; |
---|
[390] | 1201 | Plane3 bestPlane; |
---|
[406] | 1202 | Plane3 plane; |
---|
| 1203 | |
---|
[420] | 1204 | int limit = Min((int)data.mPolygons->size(), mMaxPolyCandidates); |
---|
[375] | 1205 | |
---|
| 1206 | int candidateIdx = limit; |
---|
[379] | 1207 | |
---|
[383] | 1208 | for (int i = 0; i < limit; ++ i) |
---|
[375] | 1209 | { |
---|
[390] | 1210 | candidateIdx = GetNextCandidateIdx(candidateIdx, *data.mPolygons); |
---|
[383] | 1211 | |
---|
[390] | 1212 | Polygon3 *poly = (*data.mPolygons)[candidateIdx]; |
---|
[383] | 1213 | // evaluate current candidate |
---|
| 1214 | const float candidateCost = |
---|
[400] | 1215 | SplitPlaneCost(poly->GetSupportingPlane(), data); |
---|
[375] | 1216 | |
---|
| 1217 | if (candidateCost < lowestCost) |
---|
| 1218 | { |
---|
[390] | 1219 | bestPlane = poly->GetSupportingPlane(); |
---|
[375] | 1220 | lowestCost = candidateCost; |
---|
| 1221 | } |
---|
[383] | 1222 | } |
---|
[379] | 1223 | |
---|
[410] | 1224 | //Debug << "lowest: " << lowestCost << endl; |
---|
[397] | 1225 | |
---|
[410] | 1226 | //-- choose candidate planes extracted from rays |
---|
| 1227 | // we currently use two methods |
---|
| 1228 | // 1) take 3 ray endpoints, where two are minimum and one a maximum |
---|
| 1229 | // point or the other way round |
---|
| 1230 | // 2) take plane normal as plane normal and the midpoint of the ray. |
---|
| 1231 | // PROBLEM: does not resemble any point where visibility is likely to change |
---|
[390] | 1232 | const BoundedRayContainer *rays = data.mRays; |
---|
[379] | 1233 | |
---|
[420] | 1234 | for (int i = 0; i < mMaxRayCandidates / 2; ++ i) |
---|
[379] | 1235 | { |
---|
[406] | 1236 | candidateIdx = Random((int)rays->size()); |
---|
| 1237 | BoundedRay *bRay = (*rays)[candidateIdx]; |
---|
[379] | 1238 | |
---|
[406] | 1239 | Ray *ray = bRay->mRay; |
---|
| 1240 | |
---|
| 1241 | const Vector3 minPt = ray->Extrap(bRay->mMinT); |
---|
| 1242 | const Vector3 maxPt = ray->Extrap(bRay->mMaxT); |
---|
[404] | 1243 | |
---|
[406] | 1244 | const Vector3 pt = (maxPt + minPt) * 0.5; |
---|
[404] | 1245 | |
---|
[406] | 1246 | const Vector3 normal = ray->GetDir(); |
---|
[397] | 1247 | |
---|
[406] | 1248 | plane = Plane3(normal, pt); |
---|
| 1249 | |
---|
| 1250 | const float candidateCost = SplitPlaneCost(plane, data); |
---|
| 1251 | |
---|
| 1252 | if (candidateCost < lowestCost) |
---|
| 1253 | { |
---|
| 1254 | bestPlane = plane; |
---|
| 1255 | |
---|
| 1256 | lowestCost = candidateCost; |
---|
[379] | 1257 | } |
---|
[406] | 1258 | } |
---|
[379] | 1259 | |
---|
[410] | 1260 | //Debug << "lowest: " << lowestCost << endl; |
---|
[420] | 1261 | for (int i = 0; i < mMaxRayCandidates / 2; ++ i) |
---|
[406] | 1262 | { |
---|
| 1263 | Vector3 pt[3]; |
---|
| 1264 | int idx[3]; |
---|
| 1265 | int cmaxT = 0; |
---|
| 1266 | int cminT = 0; |
---|
| 1267 | bool chooseMin = false; |
---|
[379] | 1268 | |
---|
[406] | 1269 | for (int j = 0; j < 3; j ++) |
---|
| 1270 | { |
---|
| 1271 | idx[j] = Random((int)rays->size() * 2); |
---|
| 1272 | |
---|
| 1273 | if (idx[j] >= (int)rays->size()) |
---|
| 1274 | { |
---|
| 1275 | idx[j] -= (int)rays->size(); |
---|
| 1276 | |
---|
| 1277 | chooseMin = (cminT < 2); |
---|
| 1278 | } |
---|
| 1279 | else |
---|
| 1280 | chooseMin = (cmaxT < 2); |
---|
[390] | 1281 | |
---|
[406] | 1282 | BoundedRay *bRay = (*rays)[idx[j]]; |
---|
| 1283 | pt[j] = chooseMin ? bRay->mRay->Extrap(bRay->mMinT) : bRay->mRay->Extrap(bRay->mMaxT); |
---|
| 1284 | } |
---|
[390] | 1285 | |
---|
[406] | 1286 | plane = Plane3(pt[0], pt[1], pt[2]); |
---|
| 1287 | |
---|
[400] | 1288 | const float candidateCost = SplitPlaneCost(plane, data); |
---|
[390] | 1289 | |
---|
[379] | 1290 | if (candidateCost < lowestCost) |
---|
| 1291 | { |
---|
[410] | 1292 | //Debug << "choose ray plane 2: " << candidateCost << endl; |
---|
[390] | 1293 | bestPlane = plane; |
---|
[379] | 1294 | |
---|
| 1295 | lowestCost = candidateCost; |
---|
| 1296 | } |
---|
[406] | 1297 | } |
---|
[379] | 1298 | |
---|
[410] | 1299 | #ifdef _DEBUG |
---|
[406] | 1300 | Debug << "plane lowest cost: " << lowestCost << endl; |
---|
[410] | 1301 | #endif |
---|
[390] | 1302 | return bestPlane; |
---|
[375] | 1303 | } |
---|
| 1304 | |
---|
| 1305 | int BspTree::GetNextCandidateIdx(int currentIdx, PolygonContainer &polys) |
---|
| 1306 | { |
---|
| 1307 | const int candidateIdx = Random(currentIdx --); |
---|
| 1308 | |
---|
| 1309 | // swap candidates to avoid testing same plane 2 times |
---|
| 1310 | std::swap(polys[currentIdx], polys[candidateIdx]); |
---|
| 1311 | |
---|
| 1312 | return currentIdx; |
---|
| 1313 | //return Random((int)polys.size()); |
---|
| 1314 | } |
---|
| 1315 | |
---|
[384] | 1316 | float BspTree::SplitPlaneCost(const Plane3 &candidatePlane, |
---|
[375] | 1317 | const PolygonContainer &polys) const |
---|
| 1318 | { |
---|
| 1319 | float val = 0; |
---|
| 1320 | |
---|
| 1321 | float sumBalancedPolys = 0; |
---|
| 1322 | float sumSplits = 0; |
---|
| 1323 | float sumPolyArea = 0; |
---|
| 1324 | float sumBalancedViewCells = 0; |
---|
| 1325 | float sumBlockedRays = 0; |
---|
| 1326 | float totalBlockedRays = 0; |
---|
| 1327 | //float totalArea = 0; |
---|
| 1328 | int totalViewCells = 0; |
---|
| 1329 | |
---|
| 1330 | // need three unique ids for each type of view cell |
---|
| 1331 | // for balanced view cells criterium |
---|
| 1332 | ViewCell::NewMail(); |
---|
| 1333 | const int backId = ViewCell::sMailId; |
---|
| 1334 | ViewCell::NewMail(); |
---|
| 1335 | const int frontId = ViewCell::sMailId; |
---|
| 1336 | ViewCell::NewMail(); |
---|
| 1337 | const int frontAndBackId = ViewCell::sMailId; |
---|
| 1338 | |
---|
| 1339 | PolygonContainer::const_iterator it, it_end = polys.end(); |
---|
| 1340 | |
---|
| 1341 | for (it = polys.begin(); it != it_end; ++ it) |
---|
| 1342 | { |
---|
| 1343 | const int classification = (*it)->ClassifyPlane(candidatePlane); |
---|
| 1344 | |
---|
[420] | 1345 | if (mSplitPlaneStrategy & BALANCED_POLYS) |
---|
[375] | 1346 | sumBalancedPolys += sBalancedPolysTable[classification]; |
---|
| 1347 | |
---|
[420] | 1348 | if (mSplitPlaneStrategy & LEAST_SPLITS) |
---|
[375] | 1349 | sumSplits += sLeastPolySplitsTable[classification]; |
---|
| 1350 | |
---|
[420] | 1351 | if (mSplitPlaneStrategy & LARGEST_POLY_AREA) |
---|
[375] | 1352 | { |
---|
| 1353 | if (classification == Polygon3::COINCIDENT) |
---|
| 1354 | sumPolyArea += (*it)->GetArea(); |
---|
| 1355 | //totalArea += area; |
---|
| 1356 | } |
---|
| 1357 | |
---|
[420] | 1358 | if (mSplitPlaneStrategy & BLOCKED_RAYS) |
---|
[375] | 1359 | { |
---|
| 1360 | const float blockedRays = (float)(*it)->mPiercingRays.size(); |
---|
| 1361 | |
---|
| 1362 | if (classification == Polygon3::COINCIDENT) |
---|
| 1363 | sumBlockedRays += blockedRays; |
---|
| 1364 | |
---|
| 1365 | totalBlockedRays += blockedRays; |
---|
| 1366 | } |
---|
| 1367 | |
---|
| 1368 | // assign view cells to back or front according to classificaion |
---|
[420] | 1369 | if (mSplitPlaneStrategy & BALANCED_VIEW_CELLS) |
---|
[375] | 1370 | { |
---|
| 1371 | MeshInstance *viewCell = (*it)->mParent; |
---|
| 1372 | |
---|
| 1373 | // assure that we only count a view cell |
---|
| 1374 | // once for the front and once for the back side of the plane |
---|
| 1375 | if (classification == Polygon3::FRONT_SIDE) |
---|
| 1376 | { |
---|
| 1377 | if ((viewCell->mMailbox != frontId) && |
---|
| 1378 | (viewCell->mMailbox != frontAndBackId)) |
---|
| 1379 | { |
---|
| 1380 | sumBalancedViewCells += 1.0; |
---|
| 1381 | |
---|
| 1382 | if (viewCell->mMailbox != backId) |
---|
| 1383 | viewCell->mMailbox = frontId; |
---|
| 1384 | else |
---|
| 1385 | viewCell->mMailbox = frontAndBackId; |
---|
| 1386 | |
---|
| 1387 | ++ totalViewCells; |
---|
| 1388 | } |
---|
| 1389 | } |
---|
| 1390 | else if (classification == Polygon3::BACK_SIDE) |
---|
| 1391 | { |
---|
| 1392 | if ((viewCell->mMailbox != backId) && |
---|
| 1393 | (viewCell->mMailbox != frontAndBackId)) |
---|
| 1394 | { |
---|
| 1395 | sumBalancedViewCells -= 1.0; |
---|
| 1396 | |
---|
| 1397 | if (viewCell->mMailbox != frontId) |
---|
| 1398 | viewCell->mMailbox = backId; |
---|
| 1399 | else |
---|
| 1400 | viewCell->mMailbox = frontAndBackId; |
---|
| 1401 | |
---|
| 1402 | ++ totalViewCells; |
---|
| 1403 | } |
---|
| 1404 | } |
---|
| 1405 | } |
---|
| 1406 | } |
---|
| 1407 | |
---|
[420] | 1408 | const float polysSize = (float)polys.size() + Limits::Small; |
---|
| 1409 | |
---|
[375] | 1410 | // all values should be approx. between 0 and 1 so they can be combined |
---|
| 1411 | // and scaled with the factors according to their importance |
---|
[420] | 1412 | if (mSplitPlaneStrategy & BALANCED_POLYS) |
---|
[421] | 1413 | val += mBalancedPolysFactor * fabs(sumBalancedPolys) / polysSize; |
---|
[384] | 1414 | |
---|
[420] | 1415 | if (mSplitPlaneStrategy & LEAST_SPLITS) |
---|
[421] | 1416 | val += mLeastSplitsFactor * sumSplits / polysSize; |
---|
[375] | 1417 | |
---|
[420] | 1418 | if (mSplitPlaneStrategy & LARGEST_POLY_AREA) |
---|
[375] | 1419 | // HACK: polys.size should be total area so scaling is between 0 and 1 |
---|
[421] | 1420 | val += mLargestPolyAreaFactor * (float)polys.size() / sumPolyArea; |
---|
[375] | 1421 | |
---|
[420] | 1422 | if (mSplitPlaneStrategy & BLOCKED_RAYS) |
---|
[375] | 1423 | if (totalBlockedRays != 0) |
---|
[421] | 1424 | val += mBlockedRaysFactor * (totalBlockedRays - sumBlockedRays) / totalBlockedRays; |
---|
[375] | 1425 | |
---|
[420] | 1426 | if (mSplitPlaneStrategy & BALANCED_VIEW_CELLS) |
---|
[421] | 1427 | val += mBalancedViewCellsFactor * fabs(sumBalancedViewCells) / |
---|
[420] | 1428 | ((float)totalViewCells + Limits::Small); |
---|
[375] | 1429 | |
---|
| 1430 | return val; |
---|
| 1431 | } |
---|
| 1432 | |
---|
| 1433 | bool BspTree::BoundRay(const Ray &ray, float &minT, float &maxT) const |
---|
| 1434 | { |
---|
| 1435 | maxT = 1e6; |
---|
| 1436 | minT = 0; |
---|
| 1437 | |
---|
| 1438 | // test with tree bounding box |
---|
| 1439 | if (!mBox.GetMinMaxT(ray, &minT, &maxT)) |
---|
| 1440 | return false; |
---|
| 1441 | |
---|
| 1442 | if (minT < 0) // start ray from origin |
---|
| 1443 | minT = 0; |
---|
| 1444 | |
---|
| 1445 | // bound ray or line segment |
---|
| 1446 | if ((ray.GetType() == Ray::LOCAL_RAY) && |
---|
| 1447 | !ray.intersections.empty() && |
---|
| 1448 | (ray.intersections[0].mT <= maxT)) |
---|
| 1449 | { |
---|
| 1450 | maxT = ray.intersections[0].mT; |
---|
| 1451 | } |
---|
| 1452 | |
---|
| 1453 | return true; |
---|
| 1454 | } |
---|
| 1455 | |
---|
[428] | 1456 | inline void BspTree::GenerateUniqueIdsForPvs() |
---|
| 1457 | { |
---|
| 1458 | Intersectable::NewMail(); sBackId = ViewCell::sMailId; |
---|
| 1459 | Intersectable::NewMail(); sFrontId = ViewCell::sMailId; |
---|
| 1460 | Intersectable::NewMail(); sFrontAndBackId = ViewCell::sMailId; |
---|
| 1461 | } |
---|
| 1462 | |
---|
[384] | 1463 | float BspTree::SplitPlaneCost(const Plane3 &candidatePlane, |
---|
| 1464 | const BoundedRayContainer &rays, |
---|
[390] | 1465 | const int pvs, |
---|
| 1466 | const float area, |
---|
[400] | 1467 | const BspNodeGeometry &cell) const |
---|
[375] | 1468 | { |
---|
| 1469 | float val = 0; |
---|
| 1470 | |
---|
| 1471 | float sumBalancedRays = 0; |
---|
| 1472 | float sumRaySplits = 0; |
---|
[379] | 1473 | |
---|
[390] | 1474 | int backId = 0; |
---|
| 1475 | int frontId = 0; |
---|
| 1476 | int frontAndBackId = 0; |
---|
[375] | 1477 | |
---|
[400] | 1478 | int frontPvs = 0; |
---|
| 1479 | int backPvs = 0; |
---|
[390] | 1480 | |
---|
| 1481 | // probability that view point lies in child |
---|
| 1482 | float pOverall = 0; |
---|
| 1483 | float pFront = 0; |
---|
| 1484 | float pBack = 0; |
---|
[436] | 1485 | |
---|
[420] | 1486 | if (mSplitPlaneStrategy & PVS) |
---|
[390] | 1487 | { |
---|
[428] | 1488 | // create unique ids for pvs heuristics |
---|
| 1489 | GenerateUniqueIdsForPvs(); |
---|
[390] | 1490 | |
---|
[420] | 1491 | if (mPvsUseArea) // use front and back cell areas to approximate volume |
---|
[392] | 1492 | { |
---|
[390] | 1493 | // construct child geometry with regard to the candidate split plane |
---|
[400] | 1494 | BspNodeGeometry frontCell; |
---|
| 1495 | BspNodeGeometry backCell; |
---|
[390] | 1496 | |
---|
[400] | 1497 | cell.SplitGeometry(frontCell, backCell, *this, candidatePlane); |
---|
[396] | 1498 | |
---|
[400] | 1499 | pFront = frontCell.GetArea(); |
---|
| 1500 | pBack = backCell.GetArea(); |
---|
[390] | 1501 | |
---|
| 1502 | pOverall = area; |
---|
| 1503 | } |
---|
| 1504 | } |
---|
| 1505 | |
---|
[375] | 1506 | BoundedRayContainer::const_iterator rit, rit_end = rays.end(); |
---|
| 1507 | |
---|
| 1508 | for (rit = rays.begin(); rit != rays.end(); ++ rit) |
---|
| 1509 | { |
---|
| 1510 | Ray *ray = (*rit)->mRay; |
---|
| 1511 | const float minT = (*rit)->mMinT; |
---|
| 1512 | const float maxT = (*rit)->mMaxT; |
---|
| 1513 | |
---|
[406] | 1514 | Vector3 entP, extP; |
---|
| 1515 | |
---|
[375] | 1516 | const int cf = |
---|
[406] | 1517 | ray->ClassifyPlane(candidatePlane, minT, maxT, entP, extP); |
---|
[375] | 1518 | |
---|
[420] | 1519 | if (mSplitPlaneStrategy & LEAST_RAY_SPLITS) |
---|
[375] | 1520 | { |
---|
| 1521 | sumBalancedRays += sBalancedRaysTable[cf]; |
---|
| 1522 | } |
---|
| 1523 | |
---|
[420] | 1524 | if (mSplitPlaneStrategy & BALANCED_RAYS) |
---|
[375] | 1525 | { |
---|
| 1526 | sumRaySplits += sLeastRaySplitsTable[cf]; |
---|
| 1527 | } |
---|
| 1528 | |
---|
[420] | 1529 | if (mSplitPlaneStrategy & PVS) |
---|
[375] | 1530 | { |
---|
[428] | 1531 | // in case the ray intersects an object |
---|
| 1532 | // assure that we only count the object |
---|
| 1533 | // once for the front and once for the back side of the plane |
---|
| 1534 | |
---|
| 1535 | // add the termination object |
---|
| 1536 | AddObjToPvs(ray->intersections[0].mObject, cf, frontPvs, backPvs); |
---|
| 1537 | |
---|
| 1538 | // add the source object |
---|
| 1539 | AddObjToPvs(ray->sourceObject.mObject, cf, frontPvs, backPvs); |
---|
| 1540 | |
---|
[420] | 1541 | if (!mPvsUseArea) // use front and back cell areas to approximate volume |
---|
[424] | 1542 | { |
---|
[406] | 1543 | float len = Distance(entP, extP); |
---|
| 1544 | pOverall += len; |
---|
| 1545 | |
---|
| 1546 | // use length of rays to approximate volume |
---|
| 1547 | switch (cf) |
---|
| 1548 | { |
---|
| 1549 | case Ray::COINCIDENT: |
---|
| 1550 | pBack += len; |
---|
| 1551 | pFront += len; |
---|
| 1552 | break; |
---|
| 1553 | case Ray::BACK: |
---|
| 1554 | pBack += len; |
---|
| 1555 | break; |
---|
| 1556 | case Ray::FRONT: |
---|
| 1557 | pFront += len; |
---|
| 1558 | break; |
---|
| 1559 | case Ray::FRONT_BACK: |
---|
| 1560 | { |
---|
| 1561 | // find intersection of ray segment with plane |
---|
| 1562 | const Vector3 extp = ray->Extrap(maxT); |
---|
| 1563 | const float t = candidatePlane.FindT(ray->GetLoc(), extp); |
---|
| 1564 | |
---|
| 1565 | const float newT = t * maxT; |
---|
| 1566 | float newLen = Distance(ray->Extrap(newT), extp); |
---|
| 1567 | |
---|
| 1568 | pFront += len - newLen; |
---|
| 1569 | pBack += newLen; |
---|
| 1570 | } |
---|
| 1571 | break; |
---|
| 1572 | case Ray::BACK_FRONT: |
---|
| 1573 | { |
---|
| 1574 | // find intersection of ray segment with plane |
---|
| 1575 | const Vector3 extp = ray->Extrap(maxT); |
---|
| 1576 | const float t = candidatePlane.FindT(ray->GetLoc(), extp); |
---|
| 1577 | |
---|
| 1578 | const float newT = t * maxT; |
---|
| 1579 | float newLen = Distance(ray->Extrap(newT), extp); |
---|
| 1580 | |
---|
| 1581 | pFront += len; |
---|
| 1582 | pBack += len - newLen; |
---|
| 1583 | } |
---|
| 1584 | break; |
---|
| 1585 | default: |
---|
[430] | 1586 | Debug << "Should not come here 2" << endl; |
---|
[406] | 1587 | break; |
---|
| 1588 | } |
---|
[384] | 1589 | } |
---|
[375] | 1590 | } |
---|
| 1591 | } |
---|
| 1592 | |
---|
[420] | 1593 | const float raysSize = (float)rays.size() + Limits::Small; |
---|
| 1594 | if (mSplitPlaneStrategy & LEAST_RAY_SPLITS) |
---|
[421] | 1595 | val += mLeastRaySplitsFactor * sumRaySplits / raysSize; |
---|
[375] | 1596 | |
---|
[420] | 1597 | if (mSplitPlaneStrategy & BALANCED_RAYS) |
---|
[421] | 1598 | val += mBalancedRaysFactor * fabs(sumBalancedRays) / raysSize; |
---|
[400] | 1599 | |
---|
[420] | 1600 | float denom = pOverall * (float)pvs * 2.0f + Limits::Small; |
---|
| 1601 | if ((mSplitPlaneStrategy & PVS) && area && pvs) |
---|
[402] | 1602 | { |
---|
[421] | 1603 | val += mPvsFactor * (frontPvs * pFront + (backPvs * pBack)) / denom; |
---|
[375] | 1604 | |
---|
[409] | 1605 | // give penalty to unbalanced split |
---|
[436] | 1606 | if (1) |
---|
[409] | 1607 | if (((pFront * 0.2 + Limits::Small) > pBack) || (pFront < (pBack * 0.2 + Limits::Small))) |
---|
[402] | 1608 | val += 0.5; |
---|
| 1609 | } |
---|
[404] | 1610 | |
---|
[418] | 1611 | #ifdef _DEBUG |
---|
[404] | 1612 | Debug << "totalpvs: " << pvs << " ptotal: " << pOverall |
---|
[400] | 1613 | << " frontpvs: " << frontPvs << " pFront: " << pFront |
---|
[418] | 1614 | << " backpvs: " << backPvs << " pBack: " << pBack << endl << endl; |
---|
| 1615 | #endif |
---|
[375] | 1616 | return val; |
---|
| 1617 | } |
---|
| 1618 | |
---|
[428] | 1619 | void BspTree::AddObjToPvs(Intersectable *obj, |
---|
| 1620 | const int cf, |
---|
| 1621 | int &frontPvs, |
---|
| 1622 | int &backPvs) const |
---|
[375] | 1623 | { |
---|
[428] | 1624 | if (!obj) |
---|
| 1625 | return; |
---|
[404] | 1626 | // TODO: does this really belong to no pvs? |
---|
| 1627 | //if (cf == Ray::COINCIDENT) return; |
---|
[375] | 1628 | |
---|
[428] | 1629 | // object belongs to both PVS |
---|
| 1630 | const bool bothSides = (cf == Ray::FRONT_BACK) || |
---|
| 1631 | (cf == Ray::BACK_FRONT) || |
---|
| 1632 | (cf == Ray::COINCIDENT); |
---|
| 1633 | |
---|
| 1634 | if ((cf == Ray::FRONT) || bothSides) |
---|
[375] | 1635 | { |
---|
[428] | 1636 | if ((obj->mMailbox != sFrontId) && |
---|
| 1637 | (obj->mMailbox != sFrontAndBackId)) |
---|
[384] | 1638 | { |
---|
[390] | 1639 | ++ frontPvs; |
---|
[375] | 1640 | |
---|
[428] | 1641 | if (obj->mMailbox == sBackId) |
---|
| 1642 | obj->mMailbox = sFrontAndBackId; |
---|
[384] | 1643 | else |
---|
[428] | 1644 | obj->mMailbox = sFrontId; |
---|
[384] | 1645 | } |
---|
[375] | 1646 | } |
---|
[428] | 1647 | |
---|
| 1648 | if ((cf == Ray::BACK) || bothSides) |
---|
[375] | 1649 | { |
---|
[428] | 1650 | if ((obj->mMailbox != sBackId) && |
---|
| 1651 | (obj->mMailbox != sFrontAndBackId)) |
---|
[375] | 1652 | { |
---|
[390] | 1653 | ++ backPvs; |
---|
[375] | 1654 | |
---|
[428] | 1655 | if (obj->mMailbox == sFrontId) |
---|
| 1656 | obj->mMailbox = sFrontAndBackId; |
---|
[375] | 1657 | else |
---|
[428] | 1658 | obj->mMailbox = sBackId; |
---|
[375] | 1659 | } |
---|
| 1660 | } |
---|
| 1661 | } |
---|
| 1662 | |
---|
[390] | 1663 | float BspTree::SplitPlaneCost(const Plane3 &candidatePlane, |
---|
[400] | 1664 | BspTraversalData &data) const |
---|
[375] | 1665 | { |
---|
| 1666 | float val = 0; |
---|
| 1667 | |
---|
[420] | 1668 | if (mSplitPlaneStrategy & VERTICAL_AXIS) |
---|
[375] | 1669 | { |
---|
| 1670 | Vector3 tinyAxis(0,0,0); tinyAxis[mBox.Size().TinyAxis()] = 1.0f; |
---|
| 1671 | // we put a penalty on the dot product between the "tiny" vertical axis |
---|
| 1672 | // and the split plane axis |
---|
[421] | 1673 | val += mVerticalSplitsFactor * |
---|
[375] | 1674 | fabs(DotProd(candidatePlane.mNormal, tinyAxis)); |
---|
| 1675 | } |
---|
| 1676 | |
---|
| 1677 | // the following criteria loop over all polygons to find the cost value |
---|
[420] | 1678 | if ((mSplitPlaneStrategy & BALANCED_POLYS) || |
---|
| 1679 | (mSplitPlaneStrategy & LEAST_SPLITS) || |
---|
| 1680 | (mSplitPlaneStrategy & LARGEST_POLY_AREA) || |
---|
| 1681 | (mSplitPlaneStrategy & BALANCED_VIEW_CELLS) || |
---|
| 1682 | (mSplitPlaneStrategy & BLOCKED_RAYS)) |
---|
[375] | 1683 | { |
---|
[390] | 1684 | val += SplitPlaneCost(candidatePlane, *data.mPolygons); |
---|
[375] | 1685 | } |
---|
| 1686 | |
---|
| 1687 | // the following criteria loop over all rays to find the cost value |
---|
[420] | 1688 | if ((mSplitPlaneStrategy & BALANCED_RAYS) || |
---|
| 1689 | (mSplitPlaneStrategy & LEAST_RAY_SPLITS) || |
---|
| 1690 | (mSplitPlaneStrategy & PVS)) |
---|
[375] | 1691 | { |
---|
[390] | 1692 | val += SplitPlaneCost(candidatePlane, *data.mRays, data.mPvs, |
---|
[400] | 1693 | data.mArea, *data.mGeometry); |
---|
[375] | 1694 | } |
---|
| 1695 | |
---|
| 1696 | // return linear combination of the sums |
---|
| 1697 | return val; |
---|
| 1698 | } |
---|
| 1699 | |
---|
| 1700 | void BspTree::CollectLeaves(vector<BspLeaf *> &leaves) const |
---|
| 1701 | { |
---|
| 1702 | stack<BspNode *> nodeStack; |
---|
| 1703 | nodeStack.push(mRoot); |
---|
| 1704 | |
---|
| 1705 | while (!nodeStack.empty()) |
---|
| 1706 | { |
---|
| 1707 | BspNode *node = nodeStack.top(); |
---|
| 1708 | |
---|
| 1709 | nodeStack.pop(); |
---|
| 1710 | |
---|
| 1711 | if (node->IsLeaf()) |
---|
| 1712 | { |
---|
| 1713 | BspLeaf *leaf = (BspLeaf *)node; |
---|
| 1714 | leaves.push_back(leaf); |
---|
| 1715 | } |
---|
| 1716 | else |
---|
| 1717 | { |
---|
| 1718 | BspInterior *interior = dynamic_cast<BspInterior *>(node); |
---|
| 1719 | |
---|
| 1720 | nodeStack.push(interior->GetBack()); |
---|
| 1721 | nodeStack.push(interior->GetFront()); |
---|
| 1722 | } |
---|
| 1723 | } |
---|
| 1724 | } |
---|
| 1725 | |
---|
| 1726 | AxisAlignedBox3 BspTree::GetBoundingBox() const |
---|
| 1727 | { |
---|
| 1728 | return mBox; |
---|
| 1729 | } |
---|
| 1730 | |
---|
| 1731 | BspNode *BspTree::GetRoot() const |
---|
| 1732 | { |
---|
| 1733 | return mRoot; |
---|
| 1734 | } |
---|
| 1735 | |
---|
| 1736 | void BspTree::EvaluateLeafStats(const BspTraversalData &data) |
---|
| 1737 | { |
---|
| 1738 | // the node became a leaf -> evaluate stats for leafs |
---|
| 1739 | BspLeaf *leaf = dynamic_cast<BspLeaf *>(data.mNode); |
---|
| 1740 | |
---|
| 1741 | // store maximal and minimal depth |
---|
| 1742 | if (data.mDepth > mStat.maxDepth) |
---|
| 1743 | mStat.maxDepth = data.mDepth; |
---|
| 1744 | |
---|
| 1745 | if (data.mDepth < mStat.minDepth) |
---|
| 1746 | mStat.minDepth = data.mDepth; |
---|
| 1747 | |
---|
[409] | 1748 | // accumulate depth to compute average depth |
---|
[375] | 1749 | mStat.accumDepth += data.mDepth; |
---|
| 1750 | |
---|
[426] | 1751 | |
---|
| 1752 | if (data.mDepth >= mTermMaxDepth) |
---|
| 1753 | ++ mStat.maxDepthNodes; |
---|
| 1754 | |
---|
| 1755 | if (data.mPvs < mTermMinPvs)
|
---|
| 1756 | ++ mStat.minPvsNodes;
|
---|
| 1757 |
|
---|
| 1758 | if ((int)data.mRays->size() < mTermMinRays)
|
---|
| 1759 | ++ mStat.minRaysNodes;
|
---|
| 1760 |
|
---|
| 1761 | if (data.GetAvgRayContribution() > mTermMaxRayContribution)
|
---|
| 1762 | ++ mStat.maxRayContribNodes;
|
---|
| 1763 |
|
---|
| 1764 | if (data.mGeometry->GetArea() <= mTermMinArea)
|
---|
| 1765 | ++ mStat.minAreaNodes; |
---|
| 1766 | |
---|
[410] | 1767 | #ifdef _DEBUG |
---|
[375] | 1768 | Debug << "BSP stats: " |
---|
[420] | 1769 | << "Depth: " << data.mDepth << " (max: " << mTermMaxDepth << "), " |
---|
| 1770 | << "PVS: " << data.mPvs << " (min: " << mTermMinPvs << "), " |
---|
| 1771 | << "Area: " << data.mArea << " (min: " << mTermMinArea << "), " |
---|
[426] | 1772 | << "#polygons: " << (int)data.mPolygons->size() << " (max: " << mTermMinPolys << "), " |
---|
| 1773 | << "#rays: " << (int)data.mRays->size() << " (max: " << mTermMinRays << "), " |
---|
[409] | 1774 | << "#pvs: " << leaf->GetViewCell()->GetPvs().GetSize() << "=, " |
---|
| 1775 | << "#avg ray contrib (pvs): " << (float)data.mPvs / (float)data.mRays->size() << endl; |
---|
[410] | 1776 | #endif |
---|
[375] | 1777 | } |
---|
| 1778 | |
---|
| 1779 | int BspTree::CastRay(Ray &ray) |
---|
| 1780 | { |
---|
| 1781 | int hits = 0; |
---|
| 1782 | |
---|
| 1783 | stack<BspRayTraversalData> tStack; |
---|
| 1784 | |
---|
| 1785 | float maxt, mint; |
---|
| 1786 | |
---|
| 1787 | if (!BoundRay(ray, mint, maxt)) |
---|
| 1788 | return 0; |
---|
| 1789 | |
---|
| 1790 | Intersectable::NewMail(); |
---|
| 1791 | |
---|
| 1792 | Vector3 entp = ray.Extrap(mint); |
---|
| 1793 | Vector3 extp = ray.Extrap(maxt); |
---|
| 1794 | |
---|
| 1795 | BspNode *node = mRoot; |
---|
| 1796 | BspNode *farChild = NULL; |
---|
| 1797 | |
---|
| 1798 | while (1) |
---|
| 1799 | { |
---|
| 1800 | if (!node->IsLeaf()) |
---|
| 1801 | { |
---|
| 1802 | BspInterior *in = (BspInterior *) node; |
---|
| 1803 | |
---|
| 1804 | Plane3 *splitPlane = in->GetPlane(); |
---|
| 1805 | |
---|
| 1806 | int entSide = splitPlane->Side(entp); |
---|
| 1807 | int extSide = splitPlane->Side(extp); |
---|
| 1808 | |
---|
| 1809 | Vector3 intersection; |
---|
| 1810 | |
---|
| 1811 | if (entSide < 0) |
---|
| 1812 | { |
---|
| 1813 | node = in->GetBack(); |
---|
| 1814 | |
---|
| 1815 | if(extSide <= 0) // plane does not split ray => no far child |
---|
| 1816 | continue; |
---|
| 1817 | |
---|
| 1818 | farChild = in->GetFront(); // plane splits ray |
---|
| 1819 | |
---|
| 1820 | } else if (entSide > 0) |
---|
| 1821 | { |
---|
| 1822 | node = in->GetFront(); |
---|
| 1823 | |
---|
| 1824 | if (extSide >= 0) // plane does not split ray => no far child |
---|
| 1825 | continue; |
---|
| 1826 | |
---|
| 1827 | farChild = in->GetBack(); // plane splits ray |
---|
| 1828 | } |
---|
[389] | 1829 | else // ray and plane are coincident |
---|
[375] | 1830 | { |
---|
[420] | 1831 | // WHAT TO DO IN THIS CASE ? |
---|
| 1832 | //break; |
---|
| 1833 | node = in->GetFront(); |
---|
| 1834 | continue; |
---|
[375] | 1835 | } |
---|
| 1836 | |
---|
| 1837 | // push data for far child |
---|
| 1838 | tStack.push(BspRayTraversalData(farChild, extp, maxt)); |
---|
| 1839 | |
---|
| 1840 | // find intersection of ray segment with plane |
---|
| 1841 | float t; |
---|
| 1842 | extp = splitPlane->FindIntersection(ray.GetLoc(), extp, &t); |
---|
| 1843 | maxt *= t; |
---|
| 1844 | |
---|
| 1845 | } else // reached leaf => intersection with view cell |
---|
| 1846 | { |
---|
| 1847 | BspLeaf *leaf = dynamic_cast<BspLeaf *>(node); |
---|
| 1848 | |
---|
| 1849 | if (!leaf->mViewCell->Mailed()) |
---|
| 1850 | { |
---|
| 1851 | ray.bspIntersections.push_back(Ray::BspIntersection(maxt, leaf)); |
---|
| 1852 | leaf->mViewCell->Mail(); |
---|
| 1853 | ++ hits; |
---|
| 1854 | } |
---|
| 1855 | |
---|
| 1856 | //-- fetch the next far child from the stack |
---|
| 1857 | if (tStack.empty()) |
---|
| 1858 | break; |
---|
| 1859 | |
---|
| 1860 | entp = extp; |
---|
| 1861 | mint = maxt; // NOTE: need this? |
---|
| 1862 | |
---|
| 1863 | if (ray.GetType() == Ray::LINE_SEGMENT && mint > 1.0f) |
---|
| 1864 | break; |
---|
| 1865 | |
---|
| 1866 | BspRayTraversalData &s = tStack.top(); |
---|
| 1867 | |
---|
| 1868 | node = s.mNode; |
---|
| 1869 | extp = s.mExitPoint; |
---|
| 1870 | maxt = s.mMaxT; |
---|
| 1871 | |
---|
| 1872 | tStack.pop(); |
---|
| 1873 | } |
---|
| 1874 | } |
---|
| 1875 | |
---|
| 1876 | return hits; |
---|
| 1877 | } |
---|
| 1878 | |
---|
| 1879 | bool BspTree::Export(const string filename) |
---|
| 1880 | { |
---|
| 1881 | Exporter *exporter = Exporter::GetExporter(filename); |
---|
| 1882 | |
---|
| 1883 | if (exporter) |
---|
| 1884 | { |
---|
| 1885 | exporter->ExportBspTree(*this); |
---|
| 1886 | return true; |
---|
| 1887 | } |
---|
| 1888 | |
---|
| 1889 | return false; |
---|
| 1890 | } |
---|
| 1891 | |
---|
| 1892 | void BspTree::CollectViewCells(ViewCellContainer &viewCells) const |
---|
| 1893 | { |
---|
| 1894 | stack<BspNode *> nodeStack; |
---|
| 1895 | nodeStack.push(mRoot); |
---|
| 1896 | |
---|
| 1897 | ViewCell::NewMail(); |
---|
| 1898 | |
---|
| 1899 | while (!nodeStack.empty()) |
---|
| 1900 | { |
---|
| 1901 | BspNode *node = nodeStack.top(); |
---|
| 1902 | nodeStack.pop(); |
---|
| 1903 | |
---|
| 1904 | if (node->IsLeaf()) |
---|
| 1905 | { |
---|
| 1906 | ViewCell *viewCell = dynamic_cast<BspLeaf *>(node)->mViewCell; |
---|
| 1907 | |
---|
| 1908 | if (!viewCell->Mailed()) |
---|
| 1909 | { |
---|
| 1910 | viewCell->Mail(); |
---|
| 1911 | viewCells.push_back(viewCell); |
---|
| 1912 | } |
---|
| 1913 | } |
---|
| 1914 | else |
---|
| 1915 | { |
---|
| 1916 | BspInterior *interior = dynamic_cast<BspInterior *>(node); |
---|
| 1917 | |
---|
| 1918 | nodeStack.push(interior->mFront); |
---|
| 1919 | nodeStack.push(interior->mBack); |
---|
| 1920 | } |
---|
| 1921 | } |
---|
| 1922 | } |
---|
| 1923 | |
---|
| 1924 | void BspTree::EvaluateViewCellsStats(BspViewCellsStatistics &stat) const |
---|
| 1925 | { |
---|
| 1926 | stat.Reset(); |
---|
| 1927 | |
---|
| 1928 | stack<BspNode *> nodeStack; |
---|
| 1929 | nodeStack.push(mRoot); |
---|
| 1930 | |
---|
| 1931 | ViewCell::NewMail(); |
---|
| 1932 | |
---|
| 1933 | // exclude root cell |
---|
| 1934 | mRootCell->Mail(); |
---|
| 1935 | |
---|
| 1936 | while (!nodeStack.empty()) |
---|
| 1937 | { |
---|
| 1938 | BspNode *node = nodeStack.top(); |
---|
| 1939 | nodeStack.pop(); |
---|
| 1940 | |
---|
| 1941 | if (node->IsLeaf()) |
---|
| 1942 | { |
---|
| 1943 | ++ stat.bspLeaves; |
---|
| 1944 | |
---|
| 1945 | BspViewCell *viewCell = dynamic_cast<BspLeaf *>(node)->mViewCell; |
---|
| 1946 | |
---|
| 1947 | if (!viewCell->Mailed()) |
---|
| 1948 | { |
---|
| 1949 | viewCell->Mail(); |
---|
| 1950 | |
---|
| 1951 | ++ stat.viewCells; |
---|
[414] | 1952 | const int pvsSize = viewCell->GetPvs().GetSize(); |
---|
[375] | 1953 | |
---|
| 1954 | stat.pvs += pvsSize; |
---|
| 1955 | |
---|
[414] | 1956 | if (pvsSize < 1) |
---|
[375] | 1957 | ++ stat.emptyPvs; |
---|
| 1958 | |
---|
| 1959 | if (pvsSize > stat.maxPvs) |
---|
| 1960 | stat.maxPvs = pvsSize; |
---|
| 1961 | |
---|
| 1962 | if (pvsSize < stat.minPvs) |
---|
| 1963 | stat.minPvs = pvsSize; |
---|
| 1964 | |
---|
| 1965 | if ((int)viewCell->mBspLeaves.size() > stat.maxBspLeaves) |
---|
| 1966 | stat.maxBspLeaves = (int)viewCell->mBspLeaves.size(); |
---|
| 1967 | } |
---|
| 1968 | } |
---|
| 1969 | else |
---|
| 1970 | { |
---|
| 1971 | BspInterior *interior = dynamic_cast<BspInterior *>(node); |
---|
| 1972 | |
---|
| 1973 | nodeStack.push(interior->mFront); |
---|
| 1974 | nodeStack.push(interior->mBack); |
---|
| 1975 | } |
---|
| 1976 | } |
---|
| 1977 | } |
---|
| 1978 | |
---|
| 1979 | bool BspTree::MergeViewCells(BspLeaf *front, BspLeaf *back) const |
---|
| 1980 | { |
---|
| 1981 | BspViewCell *viewCell = |
---|
| 1982 | dynamic_cast<BspViewCell *>(ViewCell::Merge(*front->mViewCell, *back->mViewCell)); |
---|
| 1983 | |
---|
| 1984 | if (!viewCell) |
---|
| 1985 | return false; |
---|
| 1986 | |
---|
| 1987 | // change view cells of all leaves associated with the |
---|
| 1988 | // previous view cells |
---|
| 1989 | |
---|
| 1990 | BspViewCell *fVc = front->mViewCell; |
---|
| 1991 | BspViewCell *bVc = back->mViewCell; |
---|
| 1992 | |
---|
| 1993 | vector<BspLeaf *> fLeaves = fVc->mBspLeaves; |
---|
| 1994 | vector<BspLeaf *> bLeaves = bVc->mBspLeaves; |
---|
| 1995 | |
---|
| 1996 | vector<BspLeaf *>::const_iterator it; |
---|
| 1997 | |
---|
| 1998 | for (it = fLeaves.begin(); it != fLeaves.end(); ++ it) |
---|
| 1999 | { |
---|
| 2000 | (*it)->SetViewCell(viewCell); |
---|
| 2001 | viewCell->mBspLeaves.push_back(*it); |
---|
| 2002 | } |
---|
| 2003 | for (it = bLeaves.begin(); it != bLeaves.end(); ++ it) |
---|
| 2004 | { |
---|
| 2005 | (*it)->SetViewCell(viewCell); |
---|
| 2006 | viewCell->mBspLeaves.push_back(*it); |
---|
| 2007 | } |
---|
| 2008 | |
---|
| 2009 | DEL_PTR(fVc); |
---|
| 2010 | DEL_PTR(bVc); |
---|
| 2011 | |
---|
| 2012 | return true; |
---|
| 2013 | } |
---|
| 2014 | |
---|
| 2015 | bool BspTree::ShouldMerge(BspLeaf *front, BspLeaf *back) const |
---|
| 2016 | { |
---|
| 2017 | ViewCell *fvc = front->mViewCell; |
---|
| 2018 | ViewCell *bvc = back->mViewCell; |
---|
| 2019 | |
---|
| 2020 | if ((fvc == mRootCell) || (bvc == mRootCell) || (fvc == bvc)) |
---|
| 2021 | return false; |
---|
| 2022 | |
---|
[378] | 2023 | int fdiff = fvc->GetPvs().Diff(bvc->GetPvs()); |
---|
| 2024 | |
---|
[420] | 2025 | if (fvc->GetPvs().GetSize() + fdiff < mMaxPvs) |
---|
[378] | 2026 | { |
---|
[420] | 2027 | if ((fvc->GetPvs().GetSize() < mMinPvs) || |
---|
| 2028 | (bvc->GetPvs().GetSize() < mMinPvs) || |
---|
| 2029 | ((fdiff < mMinPvsDif) && (bvc->GetPvs().Diff(fvc->GetPvs()) < mMinPvsDif))) |
---|
[378] | 2030 | { |
---|
| 2031 | return true; |
---|
| 2032 | } |
---|
| 2033 | } |
---|
[375] | 2034 | |
---|
| 2035 | return false; |
---|
| 2036 | } |
---|
| 2037 | |
---|
| 2038 | void BspTree::SetGenerateViewCells(int generateViewCells) |
---|
| 2039 | { |
---|
| 2040 | mGenerateViewCells = generateViewCells; |
---|
| 2041 | } |
---|
| 2042 | |
---|
| 2043 | BspTreeStatistics &BspTree::GetStat() |
---|
| 2044 | { |
---|
| 2045 | return mStat; |
---|
| 2046 | } |
---|
| 2047 | |
---|
[409] | 2048 | float BspTree::AccumulatedRayLength(BoundedRayContainer &rays) const |
---|
| 2049 | { |
---|
| 2050 | float len = 0; |
---|
| 2051 | |
---|
| 2052 | BoundedRayContainer::const_iterator it, it_end = rays.end(); |
---|
| 2053 | |
---|
| 2054 | for (it = rays.begin(); it != it_end; ++ it) |
---|
| 2055 | { |
---|
| 2056 | len += SqrDistance((*it)->mRay->Extrap((*it)->mMinT), |
---|
| 2057 | (*it)->mRay->Extrap((*it)->mMaxT)); |
---|
| 2058 | } |
---|
| 2059 | |
---|
| 2060 | return len; |
---|
| 2061 | } |
---|
| 2062 | |
---|
[375] | 2063 | int BspTree::SplitRays(const Plane3 &plane, |
---|
| 2064 | BoundedRayContainer &rays, |
---|
| 2065 | BoundedRayContainer &frontRays, |
---|
| 2066 | BoundedRayContainer &backRays) |
---|
| 2067 | { |
---|
| 2068 | int splits = 0; |
---|
| 2069 | |
---|
| 2070 | while (!rays.empty()) |
---|
| 2071 | { |
---|
| 2072 | BoundedRay *bRay = rays.back(); |
---|
| 2073 | Ray *ray = bRay->mRay; |
---|
[406] | 2074 | float minT = bRay->mMinT; |
---|
| 2075 | float maxT = bRay->mMaxT; |
---|
| 2076 | |
---|
[375] | 2077 | rays.pop_back(); |
---|
[406] | 2078 | |
---|
| 2079 | Vector3 entP, extP; |
---|
| 2080 | |
---|
[375] | 2081 | const int cf = |
---|
[406] | 2082 | ray->ClassifyPlane(plane, minT, maxT, entP, extP); |
---|
[375] | 2083 | |
---|
[406] | 2084 | // set id to ray classification |
---|
[375] | 2085 | ray->SetId(cf); |
---|
| 2086 | |
---|
| 2087 | switch (cf) |
---|
| 2088 | { |
---|
[406] | 2089 | case Ray::COINCIDENT: // TODO: should really discard ray? |
---|
[420] | 2090 | frontRays.push_back(bRay); |
---|
| 2091 | //DEL_PTR(bRay); |
---|
[375] | 2092 | break; |
---|
| 2093 | case Ray::BACK: |
---|
| 2094 | backRays.push_back(bRay); |
---|
| 2095 | break; |
---|
| 2096 | case Ray::FRONT: |
---|
| 2097 | frontRays.push_back(bRay); |
---|
| 2098 | break; |
---|
| 2099 | case Ray::FRONT_BACK: |
---|
| 2100 | { |
---|
| 2101 | // find intersection of ray segment with plane |
---|
[406] | 2102 | const float t = plane.FindT(ray->GetLoc(), extP); |
---|
[375] | 2103 | |
---|
[406] | 2104 | const float newT = t * maxT; |
---|
[375] | 2105 | |
---|
[406] | 2106 | frontRays.push_back(new BoundedRay(ray, minT, newT)); |
---|
| 2107 | backRays.push_back(new BoundedRay(ray, newT, maxT)); |
---|
[375] | 2108 | |
---|
| 2109 | DEL_PTR(bRay); |
---|
| 2110 | } |
---|
| 2111 | break; |
---|
| 2112 | case Ray::BACK_FRONT: |
---|
| 2113 | { |
---|
| 2114 | // find intersection of ray segment with plane |
---|
[406] | 2115 | const float t = plane.FindT(ray->GetLoc(), extP); |
---|
[375] | 2116 | const float newT = t * bRay->mMaxT; |
---|
| 2117 | |
---|
| 2118 | backRays.push_back(new BoundedRay(ray, bRay->mMinT, newT)); |
---|
| 2119 | frontRays.push_back(new BoundedRay(ray, newT, bRay->mMaxT)); |
---|
| 2120 | DEL_PTR(bRay); |
---|
| 2121 | |
---|
| 2122 | ++ splits; |
---|
| 2123 | } |
---|
| 2124 | break; |
---|
| 2125 | default: |
---|
[430] | 2126 | Debug << "Should not come here 4" << endl; |
---|
[375] | 2127 | break; |
---|
| 2128 | } |
---|
| 2129 | } |
---|
| 2130 | |
---|
| 2131 | return splits; |
---|
| 2132 | } |
---|
| 2133 | |
---|
[396] | 2134 | void BspTree::ExtractHalfSpaces(BspNode *n, vector<Plane3> &halfSpaces) const |
---|
[375] | 2135 | { |
---|
| 2136 | BspNode *lastNode; |
---|
| 2137 | do |
---|
| 2138 | { |
---|
| 2139 | lastNode = n; |
---|
| 2140 | |
---|
| 2141 | // want to get planes defining geometry of this node => don't take |
---|
| 2142 | // split plane of node itself |
---|
| 2143 | n = n->GetParent(); |
---|
| 2144 | |
---|
| 2145 | if (n) |
---|
| 2146 | { |
---|
| 2147 | BspInterior *interior = dynamic_cast<BspInterior *>(n); |
---|
[396] | 2148 | Plane3 halfSpace = *dynamic_cast<BspInterior *>(interior)->GetPlane(); |
---|
[375] | 2149 | |
---|
[396] | 2150 | if (interior->mFront != lastNode) |
---|
| 2151 | halfSpace.ReverseOrientation(); |
---|
| 2152 | |
---|
| 2153 | halfSpaces.push_back(halfSpace); |
---|
[375] | 2154 | } |
---|
| 2155 | } |
---|
| 2156 | while (n); |
---|
| 2157 | } |
---|
| 2158 | |
---|
[390] | 2159 | void BspTree::ConstructGeometry(BspNode *n, BspNodeGeometry &cell) const |
---|
[375] | 2160 | { |
---|
[396] | 2161 | PolygonContainer polys; |
---|
| 2162 | ConstructGeometry(n, polys); |
---|
| 2163 | cell.mPolys = polys; |
---|
[375] | 2164 | } |
---|
| 2165 | |
---|
| 2166 | void BspTree::ConstructGeometry(BspViewCell *vc, PolygonContainer &cell) const |
---|
| 2167 | { |
---|
| 2168 | vector<BspLeaf *> leaves = vc->mBspLeaves; |
---|
| 2169 | |
---|
| 2170 | vector<BspLeaf *>::const_iterator it, it_end = leaves.end(); |
---|
| 2171 | |
---|
| 2172 | for (it = leaves.begin(); it != it_end; ++ it) |
---|
| 2173 | ConstructGeometry(*it, cell); |
---|
| 2174 | } |
---|
| 2175 | |
---|
[396] | 2176 | |
---|
| 2177 | void BspTree::ConstructGeometry(BspNode *n, PolygonContainer &cell) const
|
---|
| 2178 | {
|
---|
| 2179 | vector<Plane3> halfSpaces;
|
---|
| 2180 | ExtractHalfSpaces(n, halfSpaces);
|
---|
| 2181 |
|
---|
| 2182 | PolygonContainer candidatePolys;
|
---|
| 2183 |
|
---|
| 2184 | // bounded planes are added to the polygons (reverse polygons
|
---|
| 2185 | // as they have to be outfacing
|
---|
| 2186 | for (int i = 0; i < (int)halfSpaces.size(); ++ i)
|
---|
| 2187 | {
|
---|
| 2188 | Polygon3 *p = GetBoundingBox().CrossSection(halfSpaces[i]);
|
---|
| 2189 |
|
---|
| 2190 | if (p->Valid())
|
---|
| 2191 | {
|
---|
| 2192 | candidatePolys.push_back(p->CreateReversePolygon());
|
---|
| 2193 | DEL_PTR(p);
|
---|
| 2194 | }
|
---|
| 2195 | }
|
---|
| 2196 |
|
---|
| 2197 | // add faces of bounding box (also could be faces of the cell)
|
---|
| 2198 | for (int i = 0; i < 6; ++ i)
|
---|
| 2199 | {
|
---|
| 2200 | VertexContainer vertices;
|
---|
| 2201 |
|
---|
| 2202 | for (int j = 0; j < 4; ++ j)
|
---|
| 2203 | vertices.push_back(mBox.GetFace(i).mVertices[j]);
|
---|
| 2204 |
|
---|
| 2205 | candidatePolys.push_back(new Polygon3(vertices));
|
---|
| 2206 | }
|
---|
| 2207 |
|
---|
| 2208 | for (int i = 0; i < (int)candidatePolys.size(); ++ i)
|
---|
| 2209 | {
|
---|
| 2210 | // polygon is split by all other planes
|
---|
| 2211 | for (int j = 0; (j < (int)halfSpaces.size()) && candidatePolys[i]; ++ j)
|
---|
| 2212 | {
|
---|
| 2213 | if (i == j) // polygon and plane are coincident
|
---|
| 2214 | continue;
|
---|
| 2215 |
|
---|
| 2216 | VertexContainer splitPts;
|
---|
| 2217 | Polygon3 *frontPoly, *backPoly;
|
---|
| 2218 |
|
---|
| 2219 | const int cf = candidatePolys[i]->ClassifyPlane(halfSpaces[j]);
|
---|
| 2220 |
|
---|
| 2221 | switch (cf)
|
---|
| 2222 | {
|
---|
| 2223 | case Polygon3::SPLIT:
|
---|
| 2224 | frontPoly = new Polygon3();
|
---|
| 2225 | backPoly = new Polygon3();
|
---|
| 2226 |
|
---|
[436] | 2227 | candidatePolys[i]->Split(halfSpaces[j],
|
---|
| 2228 | *frontPoly,
|
---|
| 2229 | *backPoly);
|
---|
[396] | 2230 |
|
---|
| 2231 | DEL_PTR(candidatePolys[i]);
|
---|
| 2232 |
|
---|
| 2233 | if (frontPoly->Valid())
|
---|
| 2234 | candidatePolys[i] = frontPoly;
|
---|
| 2235 | else
|
---|
| 2236 | DEL_PTR(frontPoly);
|
---|
| 2237 |
|
---|
| 2238 | DEL_PTR(backPoly);
|
---|
| 2239 | break;
|
---|
| 2240 | case Polygon3::BACK_SIDE:
|
---|
| 2241 | DEL_PTR(candidatePolys[i]);
|
---|
| 2242 | break;
|
---|
| 2243 | // just take polygon as it is
|
---|
| 2244 | case Polygon3::FRONT_SIDE:
|
---|
| 2245 | case Polygon3::COINCIDENT:
|
---|
| 2246 | default:
|
---|
| 2247 | break;
|
---|
| 2248 | }
|
---|
| 2249 | }
|
---|
| 2250 |
|
---|
| 2251 | if (candidatePolys[i])
|
---|
| 2252 | cell.push_back(candidatePolys[i]);
|
---|
| 2253 | }
|
---|
| 2254 | } |
---|
| 2255 | |
---|
| 2256 | |
---|
[375] | 2257 | int BspTree::FindNeighbors(BspNode *n, vector<BspLeaf *> &neighbors, |
---|
| 2258 | const bool onlyUnmailed) const |
---|
| 2259 | { |
---|
| 2260 | PolygonContainer cell; |
---|
| 2261 | |
---|
| 2262 | ConstructGeometry(n, cell); |
---|
| 2263 | |
---|
| 2264 | stack<BspNode *> nodeStack; |
---|
| 2265 | nodeStack.push(mRoot); |
---|
| 2266 | |
---|
| 2267 | // planes needed to verify that we found neighbor leaf. |
---|
[396] | 2268 | vector<Plane3> halfSpaces; |
---|
| 2269 | ExtractHalfSpaces(n, halfSpaces); |
---|
[375] | 2270 | |
---|
| 2271 | while (!nodeStack.empty()) |
---|
| 2272 | { |
---|
| 2273 | BspNode *node = nodeStack.top(); |
---|
| 2274 | nodeStack.pop(); |
---|
| 2275 | |
---|
| 2276 | if (node->IsLeaf()) |
---|
| 2277 | { |
---|
| 2278 | if (node != n && (!onlyUnmailed || !node->Mailed())) |
---|
| 2279 | { |
---|
[396] | 2280 | // test all planes of current node if candidate really |
---|
| 2281 | // is neighbour |
---|
[375] | 2282 | PolygonContainer neighborCandidate; |
---|
| 2283 | ConstructGeometry(node, neighborCandidate); |
---|
| 2284 | |
---|
| 2285 | bool isAdjacent = true; |
---|
[396] | 2286 | for (int i = 0; (i < halfSpaces.size()) && isAdjacent; ++ i) |
---|
[375] | 2287 | { |
---|
| 2288 | const int cf = |
---|
[396] | 2289 | Polygon3::ClassifyPlane(neighborCandidate, halfSpaces[i]); |
---|
[375] | 2290 | |
---|
[396] | 2291 | if (cf == Polygon3::BACK_SIDE) |
---|
[375] | 2292 | isAdjacent = false; |
---|
| 2293 | } |
---|
| 2294 | |
---|
| 2295 | if (isAdjacent) |
---|
| 2296 | neighbors.push_back(dynamic_cast<BspLeaf *>(node)); |
---|
| 2297 | |
---|
| 2298 | CLEAR_CONTAINER(neighborCandidate); |
---|
| 2299 | } |
---|
| 2300 | } |
---|
| 2301 | else |
---|
| 2302 | { |
---|
| 2303 | BspInterior *interior = dynamic_cast<BspInterior *>(node); |
---|
| 2304 | |
---|
| 2305 | const int cf = Polygon3::ClassifyPlane(cell, interior->mPlane); |
---|
| 2306 | |
---|
| 2307 | if (cf == Polygon3::FRONT_SIDE) |
---|
| 2308 | nodeStack.push(interior->mFront); |
---|
| 2309 | else |
---|
| 2310 | if (cf == Polygon3::BACK_SIDE) |
---|
| 2311 | nodeStack.push(interior->mBack); |
---|
| 2312 | else |
---|
| 2313 | { |
---|
| 2314 | // random decision |
---|
| 2315 | nodeStack.push(interior->mBack); |
---|
| 2316 | nodeStack.push(interior->mFront); |
---|
| 2317 | } |
---|
| 2318 | } |
---|
| 2319 | } |
---|
| 2320 | |
---|
| 2321 | CLEAR_CONTAINER(cell); |
---|
| 2322 | return (int)neighbors.size(); |
---|
| 2323 | } |
---|
| 2324 | |
---|
| 2325 | BspLeaf *BspTree::GetRandomLeaf(const Plane3 &halfspace) |
---|
| 2326 | { |
---|
| 2327 | stack<BspNode *> nodeStack; |
---|
| 2328 | nodeStack.push(mRoot); |
---|
| 2329 | |
---|
| 2330 | int mask = rand(); |
---|
| 2331 | |
---|
| 2332 | while (!nodeStack.empty()) |
---|
| 2333 | { |
---|
| 2334 | BspNode *node = nodeStack.top(); |
---|
| 2335 | nodeStack.pop(); |
---|
| 2336 | |
---|
| 2337 | if (node->IsLeaf()) |
---|
| 2338 | { |
---|
| 2339 | return dynamic_cast<BspLeaf *>(node); |
---|
| 2340 | } |
---|
| 2341 | else |
---|
| 2342 | { |
---|
| 2343 | BspInterior *interior = dynamic_cast<BspInterior *>(node); |
---|
| 2344 | |
---|
| 2345 | BspNode *next; |
---|
| 2346 | |
---|
| 2347 | PolygonContainer cell; |
---|
| 2348 | |
---|
| 2349 | // todo: not very efficient: constructs full cell everytime |
---|
| 2350 | ConstructGeometry(interior, cell); |
---|
| 2351 | |
---|
| 2352 | const int cf = Polygon3::ClassifyPlane(cell, halfspace); |
---|
| 2353 | |
---|
| 2354 | if (cf == Polygon3::BACK_SIDE) |
---|
| 2355 | next = interior->mFront; |
---|
| 2356 | else |
---|
| 2357 | if (cf == Polygon3::FRONT_SIDE) |
---|
| 2358 | next = interior->mFront; |
---|
| 2359 | else |
---|
| 2360 | { |
---|
| 2361 | // random decision |
---|
| 2362 | if (mask & 1) |
---|
| 2363 | next = interior->mBack; |
---|
| 2364 | else |
---|
| 2365 | next = interior->mFront; |
---|
| 2366 | mask = mask >> 1; |
---|
| 2367 | } |
---|
| 2368 | |
---|
| 2369 | nodeStack.push(next); |
---|
| 2370 | } |
---|
| 2371 | } |
---|
| 2372 | |
---|
| 2373 | return NULL; |
---|
| 2374 | } |
---|
| 2375 | |
---|
| 2376 | BspLeaf *BspTree::GetRandomLeaf(const bool onlyUnmailed) |
---|
| 2377 | { |
---|
| 2378 | stack<BspNode *> nodeStack; |
---|
| 2379 | |
---|
| 2380 | nodeStack.push(mRoot); |
---|
| 2381 | |
---|
| 2382 | int mask = rand(); |
---|
| 2383 | |
---|
| 2384 | while (!nodeStack.empty()) |
---|
| 2385 | { |
---|
| 2386 | BspNode *node = nodeStack.top(); |
---|
| 2387 | nodeStack.pop(); |
---|
| 2388 | |
---|
| 2389 | if (node->IsLeaf()) |
---|
| 2390 | { |
---|
| 2391 | if ( (!onlyUnmailed || !node->Mailed()) ) |
---|
| 2392 | return dynamic_cast<BspLeaf *>(node); |
---|
| 2393 | } |
---|
| 2394 | else |
---|
| 2395 | { |
---|
| 2396 | BspInterior *interior = dynamic_cast<BspInterior *>(node); |
---|
| 2397 | |
---|
| 2398 | // random decision |
---|
| 2399 | if (mask & 1) |
---|
| 2400 | nodeStack.push(interior->mBack); |
---|
| 2401 | else |
---|
| 2402 | nodeStack.push(interior->mFront); |
---|
| 2403 | |
---|
| 2404 | mask = mask >> 1; |
---|
| 2405 | } |
---|
| 2406 | } |
---|
| 2407 | |
---|
| 2408 | return NULL; |
---|
| 2409 | } |
---|
[384] | 2410 | |
---|
| 2411 | int BspTree::ComputePvsSize(const BoundedRayContainer &rays) const |
---|
| 2412 | { |
---|
| 2413 | int pvsSize = 0; |
---|
| 2414 | |
---|
| 2415 | BoundedRayContainer::const_iterator rit, rit_end = rays.end(); |
---|
| 2416 | |
---|
| 2417 | Intersectable::NewMail(); |
---|
| 2418 | |
---|
| 2419 | for (rit = rays.begin(); rit != rays.end(); ++ rit) |
---|
| 2420 | { |
---|
| 2421 | Ray *ray = (*rit)->mRay; |
---|
| 2422 | |
---|
| 2423 | if (!ray->intersections.empty()) |
---|
| 2424 | { |
---|
| 2425 | if (!ray->intersections[0].mObject->Mailed()) |
---|
| 2426 | { |
---|
| 2427 | ray->intersections[0].mObject->Mail(); |
---|
| 2428 | ++ pvsSize; |
---|
| 2429 | } |
---|
| 2430 | } |
---|
[399] | 2431 | if (ray->sourceObject.mObject) |
---|
[384] | 2432 | { |
---|
[399] | 2433 | if (!ray->sourceObject.mObject->Mailed()) |
---|
| 2434 | { |
---|
| 2435 | ray->sourceObject.mObject->Mail(); |
---|
| 2436 | ++ pvsSize; |
---|
| 2437 | } |
---|
[384] | 2438 | } |
---|
| 2439 | } |
---|
| 2440 | |
---|
| 2441 | return pvsSize; |
---|
[390] | 2442 | } |
---|
| 2443 | |
---|
| 2444 | /************************************************************* |
---|
| 2445 | * BspNodeGeometry Implementation * |
---|
| 2446 | *************************************************************/ |
---|
| 2447 | |
---|
| 2448 | BspNodeGeometry::~BspNodeGeometry() |
---|
| 2449 | { |
---|
| 2450 | CLEAR_CONTAINER(mPolys); |
---|
| 2451 | } |
---|
| 2452 | |
---|
| 2453 | float BspNodeGeometry::GetArea() const |
---|
| 2454 | { |
---|
| 2455 | return Polygon3::GetArea(mPolys); |
---|
| 2456 | } |
---|
| 2457 | |
---|
[396] | 2458 | void BspNodeGeometry::SplitGeometry(BspNodeGeometry &front, |
---|
| 2459 | BspNodeGeometry &back, |
---|
[394] | 2460 | const BspTree &tree, |
---|
[396] | 2461 | const Plane3 &splitPlane) const |
---|
| 2462 | { |
---|
[390] | 2463 | // get cross section of new polygon |
---|
| 2464 | Polygon3 *planePoly = tree.GetBoundingBox().CrossSection(splitPlane); |
---|
| 2465 | |
---|
[396] | 2466 | planePoly = SplitPolygon(planePoly, tree); |
---|
[394] | 2467 | |
---|
[396] | 2468 | //-- plane poly splits all other cell polygons |
---|
| 2469 | for (int i = 0; i < (int)mPolys.size(); ++ i) |
---|
[390] | 2470 | { |
---|
[406] | 2471 | const int cf = mPolys[i]->ClassifyPlane(splitPlane, 0.00001f); |
---|
[390] | 2472 | |
---|
| 2473 | // split new polygon with all previous planes |
---|
| 2474 | switch (cf) |
---|
| 2475 | { |
---|
| 2476 | case Polygon3::SPLIT: |
---|
| 2477 | { |
---|
[396] | 2478 | Polygon3 *poly = new Polygon3(mPolys[i]->mVertices); |
---|
| 2479 | |
---|
| 2480 | Polygon3 *frontPoly = new Polygon3(); |
---|
| 2481 | Polygon3 *backPoly = new Polygon3(); |
---|
[390] | 2482 | |
---|
[436] | 2483 | poly->Split(splitPlane, *frontPoly, *backPoly); |
---|
[390] | 2484 | |
---|
[396] | 2485 | DEL_PTR(poly); |
---|
[390] | 2486 | |
---|
[396] | 2487 | if (frontPoly->Valid()) |
---|
| 2488 | front.mPolys.push_back(frontPoly); |
---|
| 2489 | if (backPoly->Valid()) |
---|
| 2490 | back.mPolys.push_back(backPoly); |
---|
[390] | 2491 | } |
---|
[396] | 2492 | |
---|
[390] | 2493 | break; |
---|
| 2494 | case Polygon3::BACK_SIDE: |
---|
[396] | 2495 | back.mPolys.push_back(new Polygon3(mPolys[i]->mVertices)); |
---|
[390] | 2496 | break; |
---|
| 2497 | case Polygon3::FRONT_SIDE: |
---|
[396] | 2498 | front.mPolys.push_back(new Polygon3(mPolys[i]->mVertices)); |
---|
[390] | 2499 | break; |
---|
| 2500 | case Polygon3::COINCIDENT: |
---|
[396] | 2501 | //front.mPolys.push_back(CreateReversePolygon(mPolys[i])); |
---|
[404] | 2502 | back.mPolys.push_back(new Polygon3(mPolys[i]->mVertices)); |
---|
[390] | 2503 | break; |
---|
| 2504 | default: |
---|
| 2505 | break; |
---|
| 2506 | } |
---|
| 2507 | } |
---|
[396] | 2508 | |
---|
| 2509 | //-- finally add the new polygon to the child cells |
---|
| 2510 | if (planePoly) |
---|
[390] | 2511 | { |
---|
[396] | 2512 | // add polygon with normal pointing into positive half space to back cell |
---|
| 2513 | back.mPolys.push_back(planePoly); |
---|
| 2514 | // add polygon with reverse orientation to front cell |
---|
| 2515 | front.mPolys.push_back(planePoly->CreateReversePolygon()); |
---|
| 2516 | } |
---|
| 2517 | |
---|
[400] | 2518 | //Debug << "returning new geometry " << mPolys.size() << " f: " << front.mPolys.size() << " b: " << back.mPolys.size() << endl; |
---|
| 2519 | //Debug << "old area " << GetArea() << " f: " << front.GetArea() << " b: " << back.GetArea() << endl; |
---|
[396] | 2520 | } |
---|
| 2521 | |
---|
| 2522 | Polygon3 *BspNodeGeometry::SplitPolygon(Polygon3 *planePoly, |
---|
| 2523 | const BspTree &tree) const |
---|
| 2524 | { |
---|
| 2525 | // polygon is split by all other planes |
---|
| 2526 | for (int i = 0; (i < (int)mPolys.size()) && planePoly; ++ i) |
---|
| 2527 | { |
---|
| 2528 | Plane3 plane = mPolys[i]->GetSupportingPlane(); |
---|
| 2529 | |
---|
| 2530 | const int cf = |
---|
[406] | 2531 | planePoly->ClassifyPlane(plane, 0.00001f); |
---|
[390] | 2532 | |
---|
| 2533 | // split new polygon with all previous planes |
---|
| 2534 | switch (cf) |
---|
| 2535 | { |
---|
| 2536 | case Polygon3::SPLIT: |
---|
| 2537 | { |
---|
| 2538 | Polygon3 *frontPoly = new Polygon3(); |
---|
| 2539 | Polygon3 *backPoly = new Polygon3(); |
---|
[392] | 2540 | |
---|
[436] | 2541 | planePoly->Split(plane, *frontPoly, *backPoly); |
---|
[396] | 2542 | DEL_PTR(planePoly); |
---|
[390] | 2543 | |
---|
[396] | 2544 | if (backPoly->Valid()) |
---|
| 2545 | planePoly = backPoly; |
---|
[390] | 2546 | else |
---|
[396] | 2547 | DEL_PTR(backPoly); |
---|
[390] | 2548 | } |
---|
| 2549 | break; |
---|
| 2550 | case Polygon3::FRONT_SIDE: |
---|
[396] | 2551 | DEL_PTR(planePoly); |
---|
| 2552 | break; |
---|
| 2553 | // polygon is taken as it is |
---|
| 2554 | case Polygon3::BACK_SIDE: |
---|
[390] | 2555 | case Polygon3::COINCIDENT: |
---|
| 2556 | default: |
---|
| 2557 | break; |
---|
| 2558 | } |
---|
| 2559 | } |
---|
| 2560 | |
---|
[396] | 2561 | return planePoly; |
---|
[414] | 2562 | } |
---|
| 2563 | |
---|
| 2564 | void BspViewCellsStatistics::Print(ostream &app) const |
---|
| 2565 | { |
---|
| 2566 | app << "===== BspViewCells statistics ===============\n"; |
---|
| 2567 | |
---|
| 2568 | app << setprecision(4); |
---|
| 2569 | |
---|
| 2570 | //app << "#N_CTIME ( Construction time [s] )\n" << Time() << " \n"; |
---|
| 2571 | |
---|
| 2572 | app << "#N_OVERALLPVS ( objects in PVS )\n" << pvs << endl; |
---|
| 2573 | |
---|
| 2574 | app << "#N_PMAXPVS ( largest PVS )\n" << maxPvs << endl; |
---|
| 2575 | |
---|
| 2576 | app << "#N_PMINPVS ( smallest PVS )\n" << minPvs << endl; |
---|
| 2577 | |
---|
| 2578 | app << "#N_PAVGPVS ( average PVS )\n" << AvgPvs() << endl; |
---|
| 2579 | |
---|
| 2580 | app << "#N_PEMPTYPVS ( view cells with PVS smaller 2 )\n" << emptyPvs << endl; |
---|
| 2581 | |
---|
| 2582 | app << "#N_VIEWCELLS ( number of view cells)\n" << viewCells << endl; |
---|
| 2583 | |
---|
| 2584 | app << "#N_AVGBSPLEAVES (average number of BSP leaves per view cell )\n" << AvgBspLeaves() << endl; |
---|
| 2585 | |
---|
| 2586 | app << "#N_MAXBSPLEAVES ( maximal number of BSP leaves per view cell )\n" << maxBspLeaves << endl; |
---|
| 2587 | |
---|
| 2588 | app << "===== END OF BspViewCells statistics ==========\n"; |
---|
[396] | 2589 | } |
---|