[190] | 1 | #include "Plane3.h" |
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| 2 | #include "ViewCellBsp.h" |
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[194] | 3 | #include "Mesh.h" |
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[235] | 4 | #include "common.h" |
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[195] | 5 | #include "ViewCell.h" |
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[235] | 6 | #include "Environment.h" |
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| 7 | #include "Polygon3.h" |
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[241] | 8 | #include "Ray.h" |
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[242] | 9 | #include "AxisAlignedBox3.h" |
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[238] | 10 | #include <stack> |
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| 11 | #include <time.h> |
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| 12 | #include <iomanip> |
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[262] | 13 | #include "Exporter.h" |
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[238] | 14 | |
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[235] | 15 | int BspTree::sTermMaxPolygons = 10; |
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| 16 | int BspTree::sTermMaxDepth = 20; |
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[265] | 17 | int BspTree::sMaxCandidates = 10; |
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[236] | 18 | int BspTree::sSplitPlaneStrategy = NEXT_POLYGON; |
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[310] | 19 | int BspTree::sConstructionMethod = FROM_INPUT_VIEW_CELLS; |
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[297] | 20 | int BspTree::sTermMaxPolysForAxisAligned = 50; |
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[302] | 21 |
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| 22 | float BspTree::sCt_div_ci = 1.0f; |
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| 23 | float BspTree::sSplitBorder = 1.0f; |
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[303] | 24 | float BspTree::sMaxCostRatio = 0.9f; |
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[224] | 25 | |
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[297] | 26 | //-- factors for bsp tree split plane heuristics |
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| 27 | float BspTree::sLeastSplitsFactor = 1.0f; |
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| 28 | float BspTree::sBalancedPolysFactor = 2.0f; |
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| 29 | float BspTree::sBalancedViewCellsFactor = 2.0f; |
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| 30 | float BspTree::sVerticalSplitsFactor = 1.0f; // very important criterium for 2.5d scenes |
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[306] | 31 | float BspTree::sLargestPolyAreaFactor = 1.0f; |
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[296] | 32 | |
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[263] | 33 | /** Evaluates split plane classification with respect to the plane's |
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| 34 | contribution for a balanced tree. |
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| 35 | */ |
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[294] | 36 | float BspTree::sLeastSplitsTable[] = {0, 0, 1, 0}; |
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[263] | 37 | /** Evaluates split plane classification with respect to the plane's |
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| 38 | contribution for a minimum number splits in the tree. |
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| 39 | */ |
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[297] | 40 | float BspTree::sBalancedPolysTable[] = {-1, 1, 0, 0}; |
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[263] | 41 | |
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[289] | 42 | //int counter = 0; |
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[294] | 43 | |
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[195] | 44 | /****************************************************************/ |
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[221] | 45 | /* class BspNode implementation */ |
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[195] | 46 | /****************************************************************/ |
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[235] | 47 | |
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[286] | 48 | BspNode::BspNode(): mParent(NULL), mPolygons(NULL)//,mViewCellIdx(0) |
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[265] | 49 | {} |
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[235] | 50 | |
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[286] | 51 | BspNode::BspNode(BspInterior *parent): mParent(parent), mPolygons(NULL)//,mViewCellIdx(0) |
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[235] | 52 | {} |
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| 53 | |
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[264] | 54 | BspNode::~BspNode() |
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| 55 | { |
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| 56 | if (mPolygons) |
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| 57 | { |
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| 58 | CLEAR_CONTAINER(*mPolygons); |
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| 59 | DEL_PTR(mPolygons); |
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| 60 | } |
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| 61 | } |
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[265] | 62 | |
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[221] | 63 | bool BspNode::IsRoot() const |
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[190] | 64 | { |
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| 65 | return mParent == NULL; |
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| 66 | } |
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| 67 | |
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[224] | 68 | BspInterior *BspNode::GetParent() |
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| 69 | { |
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| 70 | return mParent; |
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| 71 | } |
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[235] | 72 | |
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| 73 | void BspNode::SetParent(BspInterior *parent) |
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| 74 | { |
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| 75 | mParent = parent; |
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| 76 | } |
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| 77 | |
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[260] | 78 | PolygonContainer *BspNode::GetPolygons() |
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| 79 | { |
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[264] | 80 | if (!mPolygons) |
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| 81 | mPolygons = new PolygonContainer(); |
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| 82 | |
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| 83 | return mPolygons; |
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[260] | 84 | } |
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| 85 | |
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[264] | 86 | void BspNode::ProcessPolygons(PolygonContainer *polys, bool storePolys) |
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[263] | 87 | { |
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[264] | 88 | if (storePolys) |
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[263] | 89 | { |
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[264] | 90 | while (!polys->empty()) |
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| 91 | { |
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| 92 | GetPolygons()->push_back(polys->back()); |
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| 93 | polys->pop_back(); |
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| 94 | } |
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[263] | 95 | } |
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[264] | 96 | else CLEAR_CONTAINER(*polys); |
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[263] | 97 | } |
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| 98 | |
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| 99 | |
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[195] | 100 | /****************************************************************/ |
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[221] | 101 | /* class BspInterior implementation */ |
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[195] | 102 | /****************************************************************/ |
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[194] | 103 | |
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[222] | 104 | |
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[263] | 105 | BspInterior::BspInterior(const Plane3 &plane): |
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| 106 | mPlane(plane), mFront(NULL), mBack(NULL) |
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[222] | 107 | {} |
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| 108 | |
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[221] | 109 | bool BspInterior::IsLeaf() const |
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[190] | 110 | { |
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| 111 | return false; |
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| 112 | } |
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| 113 | |
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[222] | 114 | BspNode *BspInterior::GetBack() |
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| 115 | { |
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| 116 | return mBack; |
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| 117 | } |
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| 118 | |
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| 119 | BspNode *BspInterior::GetFront() |
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| 120 | { |
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| 121 | return mFront; |
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| 122 | } |
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| 123 | |
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| 124 | Plane3 *BspInterior::GetPlane() |
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| 125 | { |
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| 126 | return &mPlane; |
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| 127 | } |
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| 128 | |
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[221] | 129 | void BspInterior::ReplaceChildLink(BspNode *oldChild, BspNode *newChild) |
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[195] | 130 | { |
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| 131 | if (mBack == oldChild) |
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| 132 | mBack = newChild; |
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[264] | 133 | else |
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[195] | 134 | mFront = newChild; |
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[267] | 135 | } |
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[195] | 136 | |
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[267] | 137 | void BspInterior::SetupChildLinks(BspNode *b, BspNode *f) |
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| 138 | { |
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| 139 | mBack = b; |
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| 140 | mFront = f; |
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| 141 | } |
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| 142 | |
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[289] | 143 | void BspInterior::ProcessPolygon(Polygon3 **poly, const bool storePolys) |
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[263] | 144 | { |
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[267] | 145 | if (storePolys) |
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[289] | 146 | GetPolygons()->push_back(*poly); |
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[267] | 147 | else |
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[289] | 148 | DEL_PTR(*poly); |
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[263] | 149 | } |
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| 150 | |
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[289] | 151 | void BspInterior::SplitPolygons(PolygonContainer *polys, |
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| 152 | PolygonContainer *frontPolys, |
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| 153 | PolygonContainer *backPolys, |
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| 154 | PolygonContainer *coincident, |
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| 155 | int &splits, |
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| 156 | bool storePolys) |
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[267] | 157 | { |
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[286] | 158 | Polygon3 *splitPoly = NULL; |
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[275] | 159 | #ifdef _Debug |
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[294] | 160 | Debug << "splitting polygons of node " << this << " with plane " << mPlane << endl; |
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[275] | 161 | #endif |
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[267] | 162 | while (!polys->empty()) |
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| 163 | { |
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| 164 | Polygon3 *poly = polys->back(); |
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| 165 | polys->pop_back(); |
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| 166 | |
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[289] | 167 | //Debug << "New polygon with plane: " << poly->GetSupportingPlane() << "\n"; |
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[268] | 168 | |
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[293] | 169 | // get polygon classification |
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[267] | 170 | int classification = poly->ClassifyPlane(mPlane); |
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| 171 | |
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| 172 | Polygon3 *front_piece = NULL; |
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| 173 | Polygon3 *back_piece = NULL; |
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[268] | 174 | |
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[312] | 175 | VertexContainer splitVertices; |
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| 176 | |
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[267] | 177 | switch (classification) |
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| 178 | { |
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| 179 | case Polygon3::COINCIDENT: |
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[286] | 180 | //Debug << "coincident" << endl; |
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[289] | 181 | coincident->push_back(poly); |
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| 182 | break; |
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[275] | 183 | case Polygon3::FRONT_SIDE: |
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[286] | 184 | //Debug << "front" << endl; |
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[267] | 185 | frontPolys->push_back(poly); |
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| 186 | break; |
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| 187 | case Polygon3::BACK_SIDE: |
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[286] | 188 | //Debug << "back" << endl; |
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[267] | 189 | backPolys->push_back(poly); |
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| 190 | break; |
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| 191 | case Polygon3::SPLIT: |
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[286] | 192 | front_piece = new Polygon3(poly->mParent); |
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| 193 | back_piece = new Polygon3(poly->mParent); |
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[294] | 194 | |
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[290] | 195 | //-- split polygon into front and back part |
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[312] | 196 | poly->Split(mPlane, *front_piece, *back_piece, splitVertices); |
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[290] | 197 | |
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| 198 | ++ splits; // increase number of splits |
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[297] | 199 | |
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| 200 | // check if polygons still valid |
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[299] | 201 | if (front_piece->Valid()) |
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[289] | 202 | frontPolys->push_back(front_piece); |
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[294] | 203 | else |
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| 204 | DEL_PTR(front_piece); |
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[297] | 205 | |
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[299] | 206 | if (back_piece->Valid()) |
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[289] | 207 | backPolys->push_back(back_piece); |
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[294] | 208 | else |
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| 209 | DEL_PTR(back_piece); |
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[290] | 210 | |
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[275] | 211 | #ifdef _DEBUG |
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[286] | 212 | Debug << "split " << *poly << endl << *front_piece << endl << *back_piece << endl; |
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[275] | 213 | #endif |
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[289] | 214 | ProcessPolygon(&poly, storePolys); |
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[267] | 215 | |
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| 216 | break; |
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| 217 | default: |
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| 218 | Debug << "SHOULD NEVER COME HERE\n"; |
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| 219 | break; |
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| 220 | } |
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[233] | 221 | } |
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| 222 | } |
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| 223 | |
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[195] | 224 | /****************************************************************/ |
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[221] | 225 | /* class BspLeaf implementation */ |
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[195] | 226 | /****************************************************************/ |
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[263] | 227 | BspLeaf::BspLeaf(): mViewCell(NULL) |
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| 228 | { |
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| 229 | } |
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[195] | 230 | |
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[264] | 231 | BspLeaf::BspLeaf(ViewCell *viewCell): mViewCell(viewCell) |
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[190] | 232 | { |
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| 233 | } |
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| 234 | |
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[263] | 235 | BspLeaf::BspLeaf(BspInterior *parent): BspNode(parent), mViewCell(NULL) |
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| 236 | {} |
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| 237 | |
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[264] | 238 | BspLeaf::BspLeaf(BspInterior *parent, ViewCell *viewCell): |
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| 239 | BspNode(parent), mViewCell(viewCell) |
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| 240 | { |
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| 241 | } |
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[222] | 242 | ViewCell *BspLeaf::GetViewCell() |
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| 243 | { |
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| 244 | return mViewCell; |
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| 245 | } |
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| 246 | |
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[260] | 247 | void BspLeaf::SetViewCell(ViewCell *viewCell) |
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| 248 | { |
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| 249 | mViewCell = viewCell; |
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| 250 | } |
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| 251 | |
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[221] | 252 | bool BspLeaf::IsLeaf() const |
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[190] | 253 | { |
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| 254 | return true; |
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| 255 | } |
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| 256 | |
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[195] | 257 | /****************************************************************/ |
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[235] | 258 | /* class BspTree implementation */ |
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[225] | 259 | /****************************************************************/ |
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| 260 | |
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[297] | 261 | BspTree::BspTree(ViewCell *viewCell): |
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[260] | 262 | mRoot(NULL), |
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[297] | 263 | mViewCell(viewCell), |
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[305] | 264 | //mStoreSplitPolys(true) |
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| 265 | mStoreSplitPolys(false) |
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[235] | 266 | { |
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[238] | 267 | Randomize(); // initialise random generator for heuristics |
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[267] | 268 | } |
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| 269 | |
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[235] | 270 | const BspTreeStatistics &BspTree::GetStatistics() const |
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| 271 | { |
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[267] | 272 | return mStat; |
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| 273 | } |
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| 274 | |
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[235] | 275 | void BspTreeStatistics::Print(ostream &app) const |
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| 276 | { |
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| 277 | app << "===== BspTree statistics ===============\n"; |
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[225] | 278 | |
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[238] | 279 | app << setprecision(4); |
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| 280 | |
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[235] | 281 | app << "#N_RAYS Number of rays )\n" |
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[263] | 282 | << rays << endl; |
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[235] | 283 | app << "#N_DOMAINS ( Number of query domains )\n" |
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| 284 | << queryDomains <<endl; |
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[225] | 285 | |
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[235] | 286 | app << "#N_NODES ( Number of nodes )\n" << nodes << "\n"; |
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[225] | 287 | |
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[267] | 288 | app << "#N_INTERIORS ( Number of interior nodes )\n" << Interior() << "\n"; |
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[265] | 289 | |
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[235] | 290 | app << "#N_LEAVES ( Number of leaves )\n" << Leaves() << "\n"; |
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[225] | 291 | |
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[265] | 292 | app << "#N_SPLITS ( Number of splits )\n" << splits << "\n"; |
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[225] | 293 | |
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[235] | 294 | app << "#N_RAYREFS ( Number of rayRefs )\n" << |
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| 295 | rayRefs << "\n"; |
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[225] | 296 | |
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[235] | 297 | app << "#N_RAYRAYREFS ( Number of rayRefs / ray )\n" << |
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| 298 | rayRefs/(double)rays << "\n"; |
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[225] | 299 | |
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[235] | 300 | app << "#N_LEAFRAYREFS ( Number of rayRefs / leaf )\n" << |
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| 301 | rayRefs/(double)Leaves() << "\n"; |
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[225] | 302 | |
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[235] | 303 | app << "#N_MAXOBJECTREFS ( Max number of rayRefs / leaf )\n" << |
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| 304 | maxObjectRefs << "\n"; |
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[225] | 305 | |
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[235] | 306 | app << "#N_NONEMPTYRAYREFS ( Number of rayRefs in nonEmpty leaves / non empty leaf )\n" << |
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| 307 | rayRefsNonZeroQuery/(double)(Leaves() - zeroQueryNodes) << "\n"; |
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[225] | 308 | |
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[235] | 309 | app << "#N_LEAFDOMAINREFS ( Number of query domain Refs / leaf )\n" << |
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| 310 | objectRefs/(double)Leaves() << "\n"; |
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[225] | 311 | |
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[235] | 312 | app << "#N_PEMPTYLEAVES ( Percentage of leaves with zero query domains )\n"<< |
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[263] | 313 | zeroQueryNodes*100/(double)Leaves() << endl; |
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[225] | 314 | |
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[235] | 315 | app << "#N_PMAXDEPTHLEAVES ( Percentage of leaves at maxdepth )\n"<< |
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[237] | 316 | maxDepthNodes * 100 / (double)Leaves() << endl; |
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[225] | 317 | |
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[265] | 318 | app << "#N_PMAXDEPTH ( Maximal reached depth )\n" << maxDepth << endl; |
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[225] | 319 | |
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[265] | 320 | app << "#N_PMINDEPTH ( Minimal reached depth )\n" << minDepth << endl; |
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[225] | 321 | |
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[267] | 322 | app << "#AVGDEPTH ( average depth )\n" << AvgDepth() << endl; |
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[195] | 323 | |
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[265] | 324 | app << "#N_ADDED_RAYREFS ( Number of dynamically added ray references )\n"<< |
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| 325 | addedRayRefs << endl; |
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[235] | 326 | |
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[265] | 327 | app << "#N_REMOVED_RAYREFS ( Number of dynamically removed ray references )\n" << |
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| 328 | removedRayRefs << endl; |
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[235] | 329 | |
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[265] | 330 | app << "#N_INPUT_POLYGONS (number of input polygons )\n" << |
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| 331 | polys << endl; |
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| 332 | |
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| 333 | app << "#N_ROUTPUT_INPUT_POLYGONS ( ratio polygons after subdivision / input polygons )\n" << |
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| 334 | (polys + splits) / (double)polys << endl; |
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| 335 | |
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[235] | 336 | app << "===== END OF BspTree statistics ==========\n"; |
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[267] | 337 | } |
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| 338 | |
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| 339 | BspTree::~BspTree() |
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| 340 | { |
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| 341 | std::stack<BspNode *> tStack; |
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| 342 | |
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| 343 | tStack.push(mRoot); |
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| 344 | |
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| 345 | while (!tStack.empty()) |
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| 346 | { |
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| 347 | BspNode *node = tStack.top(); |
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| 348 | |
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| 349 | tStack.pop(); |
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| 350 | |
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| 351 | if (!node->IsLeaf()) |
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| 352 | { |
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| 353 | BspInterior *interior = dynamic_cast<BspInterior *>(node); |
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| 354 | |
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| 355 | // push the children on the stack (there are always two children) |
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| 356 | tStack.push(interior->GetBack()); |
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| 357 | tStack.push(interior->GetFront()); |
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| 358 | } |
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| 359 | |
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| 360 | DEL_PTR(node); |
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| 361 | } |
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| 362 | } |
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| 363 | |
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[289] | 364 | void BspTree::InsertViewCell(ViewCell *viewCell) |
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| 365 | { |
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[267] | 366 | PolygonContainer *polys = new PolygonContainer(); |
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| 367 | |
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| 368 | // extract polygons that guide the split process |
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[312] | 369 | mStat.polys += AddMeshToPolygons(viewCell->GetMesh(), *polys, viewCell); |
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[267] | 370 | mBox.Include(viewCell->GetBox()); // add to BSP aabb |
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| 371 | |
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[289] | 372 | InsertPolygons(polys); |
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| 373 | } |
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| 374 | |
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| 375 | void BspTree::InsertPolygons(PolygonContainer *polys, ViewCellContainer *viewCells) |
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| 376 | { |
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| 377 | std::stack<BspTraversalData> tStack; |
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| 378 | |
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| 379 | // traverse tree or create new one |
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[267] | 380 | BspNode *firstNode = mRoot ? mRoot : new BspLeaf(); |
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| 381 | |
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[297] | 382 | tStack.push(BspTraversalData(firstNode, polys, 0, mViewCell)); |
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[267] | 383 | |
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| 384 | while (!tStack.empty()) |
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| 385 | { |
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| 386 | // filter polygons donw the tree |
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| 387 | BspTraversalData tData = tStack.top(); |
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| 388 | tStack.pop(); |
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| 389 | |
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| 390 | if (!tData.mNode->IsLeaf()) |
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| 391 | { |
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| 392 | BspInterior *interior = dynamic_cast<BspInterior *>(tData.mNode); |
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| 393 | |
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| 394 | //-- filter view cell polygons down the tree until a leaf is reached |
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| 395 | if ((int)tData.mPolygons->size() > 0) |
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| 396 | { |
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| 397 | PolygonContainer *frontPolys = new PolygonContainer(); |
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| 398 | PolygonContainer *backPolys = new PolygonContainer(); |
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[289] | 399 | PolygonContainer coincident; |
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[267] | 400 | |
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| 401 | int splits = 0; |
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| 402 | |
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[312] | 403 | // split viewcell polygons with respect to split plane |
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[289] | 404 | interior->SplitPolygons(tData.mPolygons, |
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| 405 | frontPolys, |
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| 406 | backPolys, |
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| 407 | &coincident, |
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| 408 | splits, |
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[304] | 409 | mStoreSplitPolys); |
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[276] | 410 | |
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[297] | 411 | // extract view cells associated with the split polygons |
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| 412 | ViewCell *frontViewCell = mViewCell; |
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| 413 | ViewCell *backViewCell = mViewCell; |
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| 414 | |
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| 415 | if (!viewCells) |
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| 416 | { |
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| 417 | ExtractViewCells(&backViewCell, |
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| 418 | &frontViewCell, |
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| 419 | coincident, |
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| 420 | interior->mPlane, |
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| 421 | frontPolys->empty(), |
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| 422 | backPolys->empty()); |
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| 423 | } |
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| 424 | |
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| 425 | // don't need coincident polygons anymore |
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[304] | 426 | interior->ProcessPolygons(&coincident, mStoreSplitPolys); |
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[289] | 427 | |
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[267] | 428 | mStat.splits += splits; |
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| 429 | |
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| 430 | // push the children on the stack |
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[297] | 431 | tStack.push(BspTraversalData(interior->GetFront(), frontPolys, tData.mDepth + 1, frontViewCell)); |
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| 432 | tStack.push(BspTraversalData(interior->GetBack(), backPolys, tData.mDepth + 1, backViewCell)); |
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[267] | 433 | } |
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[289] | 434 | |
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| 435 | // cleanup |
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| 436 | DEL_PTR(tData.mPolygons); |
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[267] | 437 | } |
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| 438 | else // reached leaf => subdivide current viewcell |
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| 439 | { |
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[308] | 440 | //if (tData.mPolygons->size() > 0) Debug << "Subdividing further: polygon size: " << (int)tData.mPolygons->size() << ", view cell: " << tData.mViewCell << endl; |
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| 441 | BspNode *root = Subdivide(tStack, tData); |
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[267] | 442 | |
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[308] | 443 | if (viewCells && root->IsLeaf()) |
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| 444 | { // generate new view cell for each leaf |
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| 445 | ViewCell *viewCell = new ViewCell(); |
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| 446 | viewCells->push_back(viewCell); |
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| 447 | |
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| 448 | dynamic_cast<BspLeaf *>(root)->SetViewCell(viewCell); |
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[312] | 449 | } |
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| 450 | |
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[267] | 451 | if (!mRoot) // tree empty => new root |
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| 452 | mRoot = root; |
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| 453 | } |
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| 454 | } |
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[289] | 455 | } |
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[267] | 456 | |
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[312] | 457 | int BspTree::AddMeshToPolygons(Mesh *mesh, PolygonContainer &polys, MeshInstance *parent) |
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[267] | 458 | { |
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| 459 | FaceContainer::const_iterator fi; |
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| 460 | int polysNum = 0; |
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| 461 | |
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| 462 | // copy the face data to polygons |
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| 463 | for (fi = mesh->mFaces.begin(); fi != mesh->mFaces.end(); ++ fi) |
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| 464 | { |
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| 465 | Polygon3 *poly = new Polygon3((*fi), mesh); |
---|
[286] | 466 | poly->mParent = parent; // set parent intersectable |
---|
[267] | 467 | polys.push_back(poly); |
---|
[289] | 468 | |
---|
[306] | 469 | //if (!poly->Valid()) |
---|
| 470 | // Debug << "Input polygon not valid: " << *poly << endl << "Area: " << poly->GetArea() << endl; |
---|
[301] | 471 | |
---|
[286] | 472 | ++ polysNum; |
---|
[267] | 473 | } |
---|
| 474 | return polysNum; |
---|
| 475 | } |
---|
| 476 | |
---|
| 477 | int BspTree::Copy2PolygonSoup(const ViewCellContainer &viewCells, PolygonContainer &polys, int maxObjects) |
---|
| 478 | { |
---|
[260] | 479 | int limit = (maxObjects > 0) ? Min((int)viewCells.size(), maxObjects) : (int)viewCells.size(); |
---|
| 480 | |
---|
[267] | 481 | for (int i = 0; i < limit; ++i) |
---|
[275] | 482 | {//if ((i == 12) ||(i==14)) |
---|
[267] | 483 | if (viewCells[i]->GetMesh()) // copy the mesh data to polygons |
---|
| 484 | { |
---|
| 485 | mBox.Include(viewCells[i]->GetBox()); // add to BSP tree aabb |
---|
[312] | 486 | AddMeshToPolygons(viewCells[i]->GetMesh(), polys, viewCells[i]); |
---|
[267] | 487 | } |
---|
| 488 | } |
---|
| 489 | |
---|
| 490 | return (int)polys.size(); |
---|
| 491 | } |
---|
| 492 | |
---|
| 493 | int BspTree::Copy2PolygonSoup(const ObjectContainer &objects, PolygonContainer &polys, int maxObjects) |
---|
| 494 | { |
---|
[245] | 495 | int limit = (maxObjects > 0) ? Min((int)objects.size(), maxObjects) : (int)objects.size(); |
---|
[241] | 496 | |
---|
[267] | 497 | for (int i = 0; i < limit; ++i) |
---|
| 498 | { |
---|
| 499 | Intersectable *object = objects[i];//*it; |
---|
| 500 | Mesh *mesh = NULL; |
---|
[260] | 501 | |
---|
[267] | 502 | switch (object->Type()) // extract the meshes |
---|
| 503 | { |
---|
| 504 | case Intersectable::MESH_INSTANCE: |
---|
| 505 | mesh = dynamic_cast<MeshInstance *>(object)->GetMesh(); |
---|
| 506 | break; |
---|
[308] | 507 | case Intersectable::VIEW_CELL: |
---|
[267] | 508 | mesh = dynamic_cast<ViewCell *>(object)->GetMesh(); |
---|
| 509 | break; |
---|
| 510 | // TODO: handle transformed mesh instances |
---|
| 511 | default: |
---|
[303] | 512 | Debug << "intersectable type not supported" << endl; |
---|
[267] | 513 | break; |
---|
| 514 | } |
---|
| 515 | |
---|
| 516 | if (mesh) // copy the mesh data to polygons |
---|
| 517 | { |
---|
| 518 | mBox.Include(object->GetBox()); // add to BSP tree aabb |
---|
[312] | 519 | AddMeshToPolygons(mesh, polys, mViewCell); |
---|
[267] | 520 | } |
---|
| 521 | } |
---|
[260] | 522 | |
---|
[267] | 523 | return (int)polys.size(); |
---|
[260] | 524 | } |
---|
| 525 | |
---|
[267] | 526 | void BspTree::Construct(const ViewCellContainer &viewCells) |
---|
| 527 | { |
---|
[295] | 528 | mStat.nodes = 1; |
---|
| 529 | mBox.Initialize(); // initialise bsp tree bounding box |
---|
[267] | 530 | |
---|
[286] | 531 | // copy view cell meshes into one big polygon soup |
---|
| 532 | PolygonContainer *polys = new PolygonContainer(); |
---|
[290] | 533 | mStat.polys = Copy2PolygonSoup(viewCells, *polys); |
---|
[267] | 534 | |
---|
[286] | 535 | // construct tree from viewcell polygons |
---|
| 536 | Construct(polys); |
---|
[267] | 537 | } |
---|
| 538 | |
---|
| 539 | |
---|
| 540 | void BspTree::Construct(const ObjectContainer &objects, ViewCellContainer *viewCells) |
---|
| 541 | { |
---|
[295] | 542 | mStat.nodes = 1; |
---|
| 543 | mBox.Initialize(); // initialise bsp tree bounding box |
---|
[267] | 544 | |
---|
| 545 | PolygonContainer *polys = new PolygonContainer(); |
---|
| 546 | |
---|
| 547 | // copy mesh instance polygons into one big polygon soup |
---|
| 548 | mStat.polys = Copy2PolygonSoup(objects, *polys); |
---|
| 549 | |
---|
| 550 | // construct tree from polygon soup |
---|
| 551 | Construct(polys, viewCells); |
---|
| 552 | } |
---|
| 553 | |
---|
[261] | 554 | void BspTree::Construct(const RayContainer &rays, ViewCellContainer *viewCells) |
---|
[260] | 555 | { |
---|
| 556 | // TODO |
---|
| 557 | } |
---|
| 558 | |
---|
[267] | 559 | void BspTree::Construct(PolygonContainer *polys, ViewCellContainer *viewCells) |
---|
| 560 | { |
---|
| 561 | std::stack<BspTraversalData> tStack; |
---|
| 562 | |
---|
[297] | 563 | BspTraversalData tData(new BspLeaf(), polys, 0, mViewCell); |
---|
[267] | 564 | tStack.push(tData); |
---|
| 565 | |
---|
| 566 | long startTime = GetTime(); |
---|
| 567 | Debug << "**** Contructing tree using objects ****\n"; |
---|
| 568 | while (!tStack.empty()) |
---|
| 569 | { |
---|
| 570 | tData = tStack.top(); |
---|
| 571 | tStack.pop(); |
---|
| 572 | |
---|
| 573 | // subdivide leaf node |
---|
[308] | 574 | BspNode *root = Subdivide(tStack, tData); |
---|
[239] | 575 | |
---|
[308] | 576 | if (viewCells && root->IsLeaf()) |
---|
| 577 | { // generate new view cell for each leaf |
---|
| 578 | ViewCell *viewCell = new ViewCell(); |
---|
| 579 | viewCells->push_back(viewCell); |
---|
| 580 | |
---|
| 581 | dynamic_cast<BspLeaf *>(root)->SetViewCell(viewCell); |
---|
| 582 | } |
---|
| 583 | |
---|
[263] | 584 | // empty tree => new root corresponding to unbounded space |
---|
[262] | 585 | if (!mRoot) |
---|
[239] | 586 | mRoot = root; |
---|
[267] | 587 | } |
---|
[233] | 588 | |
---|
[267] | 589 | Debug << "**** Finished tree construction ****\n"; |
---|
[294] | 590 | Debug << "BSP tree contruction time: " << TimeDiff(startTime, GetTime())*1e-3 << "s" << endl; |
---|
[267] | 591 | } |
---|
[260] | 592 | |
---|
[267] | 593 | |
---|
[308] | 594 | BspNode *BspTree::Subdivide(BspTraversalStack &tStack, BspTraversalData &tData) |
---|
[267] | 595 | { |
---|
| 596 | //-- terminate traversal |
---|
[295] | 597 | if ((tData.mPolygons->size() <= sTermMaxPolygons) || (tData.mDepth >= sTermMaxDepth)) |
---|
[267] | 598 | { |
---|
[303] | 599 | #ifdef _DEBUG |
---|
[308] | 600 | Debug << "subdivision terminated at depth " << tData.mDepth << ", #polys: " |
---|
| 601 | << (int)tData.mPolygons->size() << endl; |
---|
[303] | 602 | #endif |
---|
[267] | 603 | |
---|
| 604 | EvaluateLeafStats(tData); |
---|
| 605 | |
---|
[286] | 606 | BspLeaf *leaf = dynamic_cast<BspLeaf *>(tData.mNode); |
---|
[308] | 607 | |
---|
| 608 | // add view cell to leaf |
---|
| 609 | if (!leaf->GetViewCell()) |
---|
[303] | 610 | leaf->SetViewCell(tData.mViewCell); |
---|
[267] | 611 | |
---|
[289] | 612 | // remaining polygons are discarded or added to node |
---|
[308] | 613 | leaf->ProcessPolygons(tData.mPolygons, mStoreSplitPolys); |
---|
[289] | 614 | DEL_PTR(tData.mPolygons); |
---|
| 615 | |
---|
[308] | 616 | return leaf; |
---|
[267] | 617 | } |
---|
| 618 | |
---|
[289] | 619 | //-- continue subdivision |
---|
[267] | 620 | PolygonContainer *backPolys = new PolygonContainer(); |
---|
| 621 | PolygonContainer *frontPolys = new PolygonContainer(); |
---|
[289] | 622 | PolygonContainer coincident; |
---|
[276] | 623 | |
---|
[289] | 624 | // create new interior node and two leaf nodes |
---|
[267] | 625 | BspInterior *interior = SubdivideNode(dynamic_cast<BspLeaf *>(tData.mNode), |
---|
| 626 | tData.mPolygons, |
---|
| 627 | frontPolys, |
---|
[276] | 628 | backPolys, |
---|
[289] | 629 | &coincident); |
---|
[267] | 630 | |
---|
[297] | 631 | ViewCell *frontViewCell = mViewCell; |
---|
| 632 | ViewCell *backViewCell = mViewCell; |
---|
[308] | 633 | |
---|
| 634 | #ifdef _DEBUG |
---|
| 635 | if (frontPolys->empty() && backPolys->empty() && (coincident.size() > 2)) |
---|
| 636 | { for (PolygonContainer::iterator it = coincident.begin(); it != coincident.end(); ++it) |
---|
| 637 | Debug << (*it) << " " << (*it)->GetArea() << " " << (*it)->mParent << endl ; |
---|
| 638 | Debug << endl;} |
---|
| 639 | #endif |
---|
| 640 | |
---|
| 641 | //-- extract view cells from coincident polygons according to plane normal |
---|
| 642 | ExtractViewCells(&backViewCell, &frontViewCell, coincident, interior->mPlane, |
---|
| 643 | frontPolys->empty(), backPolys->empty()); |
---|
[297] | 644 | |
---|
| 645 | // don't need coincident polygons anymore |
---|
[304] | 646 | interior->ProcessPolygons(&coincident, mStoreSplitPolys); |
---|
[289] | 647 | |
---|
[267] | 648 | // push the children on the stack |
---|
[289] | 649 | // split polygon is only needed in the back leaf |
---|
[297] | 650 | tStack.push(BspTraversalData(interior->GetFront(), frontPolys, tData.mDepth + 1, frontViewCell)); |
---|
| 651 | tStack.push(BspTraversalData(interior->GetBack(), backPolys, tData.mDepth + 1, backViewCell)); |
---|
[267] | 652 | |
---|
[289] | 653 | // cleanup |
---|
| 654 | DEL_PTR(tData.mNode); |
---|
| 655 | DEL_PTR(tData.mPolygons); |
---|
| 656 | |
---|
[267] | 657 | return interior; |
---|
[195] | 658 | } |
---|
[190] | 659 | |
---|
[297] | 660 | void BspTree::ExtractViewCells(ViewCell **backViewCell, |
---|
| 661 | ViewCell **frontViewCell, |
---|
| 662 | const PolygonContainer &coincident, |
---|
| 663 | const Plane3 splitPlane, |
---|
| 664 | const bool extractFront, |
---|
| 665 | const bool extractBack) const |
---|
| 666 | { |
---|
| 667 | bool foundFront = !extractFront, foundBack = !extractBack; |
---|
[262] | 668 | |
---|
[297] | 669 | PolygonContainer::const_iterator it, it_end = coincident.end(); |
---|
| 670 | |
---|
[308] | 671 | //-- find first view cells in front and back leafs |
---|
[297] | 672 | for (it = coincident.begin(); !(foundFront && foundBack) && |
---|
[308] | 673 | (it != it_end); ++ it) |
---|
[297] | 674 | { |
---|
| 675 | if (DotProd((*it)->GetSupportingPlane().mNormal, splitPlane.mNormal > 0)) |
---|
| 676 | { |
---|
| 677 | *backViewCell = dynamic_cast<ViewCell *>((*it)->mParent); |
---|
| 678 | foundBack = true; |
---|
| 679 | } |
---|
| 680 | else |
---|
| 681 | { |
---|
| 682 | *frontViewCell = dynamic_cast<ViewCell *>((*it)->mParent); |
---|
| 683 | foundFront = true; |
---|
| 684 | } |
---|
[303] | 685 | //if (foundFront) Debug << "front viewCell: " << *frontViewCell << endl; |
---|
| 686 | //if (foundBack) Debug << "back viewCell: " << *backViewCell << endl; |
---|
[297] | 687 | } |
---|
| 688 | } |
---|
| 689 | |
---|
[267] | 690 | BspInterior *BspTree::SubdivideNode(BspLeaf *leaf, |
---|
| 691 | PolygonContainer *polys, |
---|
[276] | 692 | PolygonContainer *frontPolys, |
---|
[289] | 693 | PolygonContainer *backPolys, |
---|
| 694 | PolygonContainer *coincident) |
---|
[267] | 695 | { |
---|
| 696 | mStat.nodes += 2; |
---|
| 697 | |
---|
| 698 | // add the new nodes to the tree + select subdivision plane |
---|
[302] | 699 | BspInterior *interior = new BspInterior(SelectPlane(leaf, *polys)); |
---|
[267] | 700 | |
---|
| 701 | #ifdef _DEBUG |
---|
| 702 | Debug << interior << endl; |
---|
| 703 | #endif |
---|
| 704 | |
---|
| 705 | // split polygon according to current plane |
---|
| 706 | int splits = 0; |
---|
| 707 | |
---|
[304] | 708 | interior->SplitPolygons(polys, frontPolys, backPolys, coincident, splits, mStoreSplitPolys); |
---|
[289] | 709 | |
---|
[267] | 710 | mStat.splits += splits; |
---|
| 711 | |
---|
| 712 | BspInterior *parent = leaf->GetParent(); |
---|
| 713 | |
---|
| 714 | // replace a link from node's parent |
---|
| 715 | if (parent) |
---|
| 716 | { |
---|
| 717 | parent->ReplaceChildLink(leaf, interior); |
---|
| 718 | interior->SetParent(parent); |
---|
| 719 | } |
---|
| 720 | |
---|
| 721 | // and setup child links |
---|
| 722 | interior->SetupChildLinks(new BspLeaf(interior), new BspLeaf(interior)); |
---|
| 723 | |
---|
| 724 | return interior; |
---|
[260] | 725 | } |
---|
| 726 | |
---|
[302] | 727 | void BspTree::SortSplitCandidates(const PolygonContainer &polys, |
---|
| 728 | const int axis, |
---|
| 729 | vector<SortableEntry> &splitCandidates) const |
---|
[195] | 730 | { |
---|
[302] | 731 | splitCandidates.clear(); |
---|
| 732 | |
---|
| 733 | int requestedSize = 2 * (int)polys.size(); |
---|
| 734 | // creates a sorted split candidates array |
---|
| 735 | splitCandidates.reserve(requestedSize); |
---|
| 736 | |
---|
| 737 | PolygonContainer::const_iterator it, it_end = polys.end(); |
---|
| 738 | |
---|
| 739 | AxisAlignedBox3 box; |
---|
| 740 | |
---|
| 741 | // insert all queries |
---|
| 742 | for(it = polys.begin(); it != it_end; ++ it) |
---|
| 743 | { |
---|
| 744 | box.Initialize(); |
---|
| 745 | box.Include(*(*it)); |
---|
| 746 | |
---|
| 747 | splitCandidates.push_back(SortableEntry(SortableEntry::POLY_MIN, box.Min(axis), *it)); |
---|
| 748 | splitCandidates.push_back(SortableEntry(SortableEntry::POLY_MAX, box.Max(axis), *it)); |
---|
| 749 | } |
---|
| 750 | |
---|
| 751 | stable_sort(splitCandidates.begin(), splitCandidates.end()); |
---|
| 752 | } |
---|
| 753 | |
---|
| 754 | |
---|
| 755 | float BspTree::BestCostRatio(const PolygonContainer &polys, |
---|
| 756 | const AxisAlignedBox3 &box, |
---|
| 757 | const int axis, |
---|
| 758 | float &position, |
---|
| 759 | int &objectsBack, |
---|
| 760 | int &objectsFront) const |
---|
| 761 | { |
---|
| 762 | vector<SortableEntry> splitCandidates; |
---|
| 763 | |
---|
| 764 | SortSplitCandidates(polys, axis, splitCandidates);
|
---|
| 765 |
|
---|
| 766 | // go through the lists, count the number of objects left and right
|
---|
| 767 | // and evaluate the following cost funcion:
|
---|
| 768 | // C = ct_div_ci + (ol + or)/queries
|
---|
| 769 |
|
---|
| 770 | int objectsLeft = 0, objectsRight = (int)polys.size();
|
---|
| 771 |
|
---|
| 772 | float minBox = box.Min(axis);
|
---|
| 773 | float maxBox = box.Max(axis);
|
---|
| 774 | float boxArea = box.SurfaceArea();
|
---|
| 775 |
|
---|
| 776 | float minBand = minBox + sSplitBorder * (maxBox - minBox);
|
---|
| 777 | float maxBand = minBox + (1.0f - sSplitBorder) * (maxBox - minBox);
|
---|
| 778 |
|
---|
| 779 | float minSum = 1e20f;
|
---|
| 780 | vector<SortableEntry>::const_iterator ci, ci_end = splitCandidates.end();
|
---|
| 781 |
|
---|
| 782 | for(ci = splitCandidates.begin(); ci != ci_end; ++ ci)
|
---|
| 783 | {
|
---|
| 784 | switch ((*ci).type)
|
---|
| 785 | {
|
---|
| 786 | case SortableEntry::POLY_MIN:
|
---|
| 787 | ++ objectsLeft;
|
---|
| 788 | break;
|
---|
| 789 | case SortableEntry::POLY_MAX:
|
---|
| 790 | -- objectsRight;
|
---|
| 791 | break;
|
---|
| 792 | default:
|
---|
| 793 | break;
|
---|
| 794 | }
|
---|
| 795 |
|
---|
| 796 | if ((*ci).value > minBand && (*ci).value < maxBand)
|
---|
| 797 | {
|
---|
| 798 | AxisAlignedBox3 lbox = box;
|
---|
| 799 | AxisAlignedBox3 rbox = box;
|
---|
| 800 | lbox.SetMax(axis, (*ci).value);
|
---|
| 801 | rbox.SetMin(axis, (*ci).value);
|
---|
| 802 |
|
---|
| 803 | float sum = objectsLeft * lbox.SurfaceArea() +
|
---|
| 804 | objectsRight * rbox.SurfaceArea();
|
---|
| 805 |
|
---|
| 806 | if (sum < minSum)
|
---|
| 807 | {
|
---|
| 808 | minSum = sum;
|
---|
| 809 | position = (*ci).value;
|
---|
| 810 |
|
---|
| 811 | objectsBack = objectsLeft;
|
---|
| 812 | objectsFront = objectsRight;
|
---|
| 813 | }
|
---|
| 814 | }
|
---|
| 815 | }
|
---|
| 816 |
|
---|
| 817 | float oldCost = (float)polys.size();
|
---|
| 818 | float newCost = sCt_div_ci + minSum / boxArea;
|
---|
| 819 | float ratio = newCost / oldCost;
|
---|
| 820 |
|
---|
| 821 |
|
---|
| 822 | #if 0
|
---|
| 823 | Debug << "====================" << endl;
|
---|
| 824 | Debug << "costRatio=" << ratio << " pos=" << position<<" t=" << (position - minBox)/(maxBox - minBox)
|
---|
| 825 | << "\t o=(" << objectsBack << "," << objectsFront << ")" << endl;
|
---|
| 826 | #endif
|
---|
| 827 | return ratio; |
---|
| 828 | } |
---|
| 829 | |
---|
[305] | 830 | Plane3 BspTree::SelectPlane(BspLeaf *leaf, PolygonContainer &polys) |
---|
[302] | 831 | { |
---|
[295] | 832 | if (polys.size() == 0) |
---|
[263] | 833 | { |
---|
| 834 | Debug << "Warning: No split candidate available\n"; |
---|
| 835 | return Plane3(); |
---|
| 836 | } |
---|
| 837 | |
---|
[297] | 838 | if ((sSplitPlaneStrategy & AXIS_ALIGNED) && |
---|
| 839 | ((int)polys.size() > sTermMaxPolysForAxisAligned)) |
---|
[236] | 840 | { |
---|
[295] | 841 | AxisAlignedBox3 box; |
---|
| 842 | box.Initialize(); |
---|
| 843 | |
---|
[297] | 844 | // todo: area subdivision |
---|
[295] | 845 | Polygon3::IncludeInBox(polys, box); |
---|
| 846 | |
---|
[301] | 847 | int objectsBack = 0, objectsFront = 0; |
---|
| 848 | int axis = 0; |
---|
| 849 | float costRatio = MAX_FLOAT; |
---|
| 850 | Vector3 position; |
---|
| 851 | |
---|
[302] | 852 | for (int i = 0; i < 3; ++ i) |
---|
[301] | 853 | { |
---|
| 854 | float p = 0; |
---|
[302] | 855 | float r = BestCostRatio(polys, box, i, p, objectsBack, objectsFront); |
---|
| 856 | |
---|
[301] | 857 | if (r < costRatio) |
---|
| 858 | { |
---|
| 859 | costRatio = r; |
---|
| 860 | axis = i; |
---|
| 861 | position = p; |
---|
| 862 | } |
---|
| 863 | } |
---|
| 864 | |
---|
[302] | 865 | if (costRatio < sMaxCostRatio) |
---|
| 866 | { |
---|
| 867 | Vector3 norm(0,0,0); norm[axis] = 1.0f;
|
---|
| 868 | return Plane3(norm, position);
|
---|
| 869 | }
|
---|
[301] | 870 | /*int axis = box.Size().DrivingAxis();
|
---|
[295] | 871 | Vector3 norm(0,0,0); norm[axis] = 1;
|
---|
[304] | 872 | Vector3 position = (box.Min()[axis] + box.Max()[axis]) * 0.5f; |
---|
| 873 | return Plane3(norm, position);*/ |
---|
[295] | 874 | } |
---|
| 875 | |
---|
[297] | 876 | // simplest strategy: just take next polygon |
---|
| 877 | if (sSplitPlaneStrategy & NEXT_POLYGON) |
---|
| 878 | { |
---|
| 879 | return polys.front()->GetSupportingPlane(); |
---|
| 880 | } |
---|
| 881 | |
---|
[260] | 882 | // use heuristics to find appropriate plane |
---|
[263] | 883 | return SelectPlaneHeuristics(polys, sMaxCandidates); |
---|
[195] | 884 | } |
---|
| 885 | |
---|
[305] | 886 | Plane3 BspTree::SelectPlaneHeuristics(PolygonContainer &polys, int maxTests) |
---|
[238] | 887 | { |
---|
[294] | 888 | float lowestCost = MAX_FLOAT; |
---|
[265] | 889 | int bestPlaneIdx = 0; |
---|
[238] | 890 | |
---|
[304] | 891 | int limit = maxTests > 0 ? Min((int)polys.size(), maxTests) : (int)polys.size(); |
---|
| 892 | |
---|
| 893 | int candidateIdx = limit; |
---|
[306] | 894 | |
---|
[265] | 895 | for (int i = 0; i < limit; ++ i) |
---|
[238] | 896 | { |
---|
[305] | 897 | candidateIdx = GetNextCandidateIdx(candidateIdx, polys); |
---|
[304] | 898 | |
---|
[295] | 899 | Plane3 candidatePlane = polys[candidateIdx]->GetSupportingPlane(); |
---|
[239] | 900 | |
---|
[238] | 901 | // evaluate current candidate |
---|
[295] | 902 | float candidateCost = EvalSplitPlane(polys, candidatePlane); |
---|
[238] | 903 | |
---|
[240] | 904 | if (candidateCost < lowestCost) |
---|
[238] | 905 | { |
---|
[265] | 906 | bestPlaneIdx = candidateIdx; |
---|
[240] | 907 | lowestCost = candidateCost; |
---|
[238] | 908 | } |
---|
| 909 | } |
---|
[305] | 910 | |
---|
[301] | 911 | //Debug << "Plane lowest cost: " << lowestCost << endl; |
---|
[295] | 912 | return polys[bestPlaneIdx]->GetSupportingPlane(); |
---|
[238] | 913 | } |
---|
| 914 | |
---|
[305] | 915 | int BspTree::GetNextCandidateIdx(int currentIdx, PolygonContainer &polys) |
---|
[238] | 916 | { |
---|
[305] | 917 | int candidateIdx = Random(currentIdx--); |
---|
| 918 | |
---|
[306] | 919 | //Debug << "new candidate " << candidateIdx << endl; |
---|
| 920 | |
---|
[305] | 921 | // swap candidates to avoid testing same plane 2 times |
---|
| 922 | Polygon3 *p = polys[candidateIdx]; |
---|
| 923 | polys[candidateIdx] = polys[currentIdx]; |
---|
| 924 | polys[currentIdx] = p; |
---|
| 925 | |
---|
| 926 | return currentIdx; |
---|
[295] | 927 | } |
---|
[238] | 928 | |
---|
[305] | 929 | float BspTree::EvalSplitPlane(PolygonContainer &polys, const Plane3 &candidatePlane) |
---|
[295] | 930 | { |
---|
[301] | 931 | float val = 0; |
---|
[295] | 932 | |
---|
[296] | 933 | if (sSplitPlaneStrategy & VERTICAL_AXIS) |
---|
[238] | 934 | { |
---|
[297] | 935 | Vector3 tinyAxis(0,0,0); tinyAxis[mBox.Size().TinyAxis()] = 1.0f; |
---|
[303] | 936 | // we put a penalty on the dot product between the "tiny" vertical axis |
---|
[297] | 937 | // and the split plane axis |
---|
[301] | 938 | val += sVerticalSplitsFactor * |
---|
[306] | 939 | fabs(DotProd(candidatePlane.mNormal, tinyAxis)); |
---|
[295] | 940 | } |
---|
[306] | 941 | |
---|
[297] | 942 | //-- strategies where the effect of the split plane on the polygons is tested |
---|
[306] | 943 | if (!((sSplitPlaneStrategy & BALANCED_POLYS) || |
---|
| 944 | (sSplitPlaneStrategy & LEAST_SPLITS) || |
---|
| 945 | (sSplitPlaneStrategy & LARGEST_POLY_AREA) || |
---|
| 946 | (sSplitPlaneStrategy & BALANCED_VIEW_CELLS))) |
---|
| 947 | return val; |
---|
| 948 | |
---|
| 949 | PolygonContainer::const_iterator it, it_end = polys.end(); |
---|
| 950 | float sumBalancedPolys = 0; |
---|
| 951 | float sumSplits = 0; |
---|
| 952 | float sumPolyArea = 0; |
---|
| 953 | float sumBalancedViewCells = 0; |
---|
| 954 | //float totalArea = 0; |
---|
| 955 | |
---|
| 956 | // container for view cells |
---|
| 957 | ObjectContainer frontViewCells; |
---|
| 958 | ObjectContainer backViewCells; |
---|
| 959 | |
---|
| 960 | for (it = polys.begin(); it != it_end; ++ it) |
---|
[295] | 961 | { |
---|
[306] | 962 | int classification = (*it)->ClassifyPlane(candidatePlane); |
---|
[301] | 963 | |
---|
[306] | 964 | if (sSplitPlaneStrategy & BALANCED_POLYS) |
---|
| 965 | sumBalancedPolys += sBalancedPolysTable[classification]; |
---|
| 966 | |
---|
| 967 | if (sSplitPlaneStrategy & LEAST_SPLITS) |
---|
| 968 | sumSplits += sLeastSplitsTable[classification]; |
---|
| 969 | |
---|
| 970 | if (sSplitPlaneStrategy & LARGEST_POLY_AREA) |
---|
[238] | 971 | { |
---|
[306] | 972 | if (classification == Polygon3::COINCIDENT) |
---|
| 973 | { |
---|
| 974 | float area = (*it)->GetArea(); |
---|
| 975 | //Debug << "polygon area: " << area << " "; |
---|
| 976 | sumPolyArea += area; |
---|
[299] | 977 | } |
---|
[306] | 978 | //totalArea += area; |
---|
[301] | 979 | } |
---|
[238] | 980 | |
---|
[307] | 981 | // assign view cells to back or front according to classificaion |
---|
[306] | 982 | if (sSplitPlaneStrategy & BALANCED_VIEW_CELLS) |
---|
[297] | 983 | { |
---|
[308] | 984 | MeshInstance *viewCell = (*it)->mParent; |
---|
[306] | 985 | |
---|
| 986 | if (classification == Polygon3::FRONT_SIDE) |
---|
[297] | 987 | frontViewCells.push_back(viewCell); |
---|
| 988 | else if (viewCell && (classification == Polygon3::BACK_SIDE)) |
---|
| 989 | backViewCells.push_back(viewCell); |
---|
| 990 | } |
---|
[306] | 991 | } |
---|
[297] | 992 | |
---|
[306] | 993 | if (sSplitPlaneStrategy & BALANCED_POLYS) |
---|
| 994 | val += sBalancedPolysFactor * fabs(sumBalancedPolys) / (float)polys.size(); |
---|
| 995 | |
---|
| 996 | if (sSplitPlaneStrategy & LEAST_SPLITS) |
---|
| 997 | val += sLeastSplitsFactor * sumSplits / (float)polys.size(); |
---|
| 998 | |
---|
[308] | 999 | if (sSplitPlaneStrategy & LARGEST_POLY_AREA) |
---|
[306] | 1000 | val += sLargestPolyAreaFactor * (float)polys.size() / sumPolyArea; // HACK |
---|
| 1001 | |
---|
| 1002 | if (sSplitPlaneStrategy & BALANCED_VIEW_CELLS) |
---|
| 1003 | { |
---|
[297] | 1004 | // count number of unique view cells |
---|
| 1005 | sort(frontViewCells.begin(), frontViewCells.end());
|
---|
| 1006 | sort(backViewCells.begin(), backViewCells.end());
|
---|
| 1007 |
|
---|
| 1008 | ObjectContainer::const_iterator frontIt, frontIt_end = frontViewCells.end();
|
---|
[306] | 1009 |
|
---|
[308] | 1010 | Intersectable *vc = NULL;
|
---|
[297] | 1011 | // increase counter for view cells in front of plane
|
---|
[306] | 1012 | for (frontIt = frontViewCells.begin(); frontIt != frontIt_end; ++frontIt)
|
---|
[297] | 1013 | {
|
---|
[308] | 1014 | if (*frontIt != vc)
|
---|
[297] | 1015 | {
|
---|
[308] | 1016 | vc = *frontIt;
|
---|
[301] | 1017 | sumBalancedViewCells += 1.0f;
|
---|
[297] | 1018 | }
|
---|
| 1019 | }
|
---|
| 1020 |
|
---|
| 1021 | ObjectContainer::const_iterator backIt, backIt_end = backViewCells.end();
|
---|
[308] | 1022 | vc = NULL;
|
---|
[297] | 1023 | // decrease counter for view cells on back side of plane
|
---|
[306] | 1024 | for (backIt = backViewCells.begin(); backIt != backIt_end; ++backIt)
|
---|
[297] | 1025 | {
|
---|
[308] | 1026 | if (*backIt != vc)
|
---|
[297] | 1027 | {
|
---|
[308] | 1028 | vc = *backIt;
|
---|
[306] | 1029 | sumBalancedViewCells -= 1.0f;
|
---|
[297] | 1030 | }
|
---|
| 1031 | } |
---|
[301] | 1032 | |
---|
[306] | 1033 | val += sBalancedViewCellsFactor * fabs(sumBalancedViewCells) / |
---|
| 1034 | (float)(frontViewCells.size() + backViewCells.size()); |
---|
[297] | 1035 | } |
---|
| 1036 | |
---|
[295] | 1037 | // return linear combination of the sums |
---|
[301] | 1038 | return val; |
---|
[238] | 1039 | } |
---|
| 1040 | |
---|
[267] | 1041 | void BspTree::ParseEnvironment() |
---|
| 1042 | { |
---|
[310] | 1043 | //-- parse bsp cell tree construction method |
---|
| 1044 | char constructionMethodStr[60]; |
---|
| 1045 | |
---|
| 1046 | environment->GetStringValue("BspTree.constructionMethod", constructionMethodStr); |
---|
| 1047 | |
---|
| 1048 | sConstructionMethod = FROM_INPUT_VIEW_CELLS; |
---|
| 1049 | |
---|
| 1050 | if (strcmp(constructionMethodStr, "fromViewCells") == 0) |
---|
| 1051 | sConstructionMethod = FROM_INPUT_VIEW_CELLS; |
---|
| 1052 | else if (strcmp(constructionMethodStr, "fromSceneGeometry") == 0) |
---|
| 1053 | sConstructionMethod = FROM_SCENE_GEOMETRY; |
---|
| 1054 | else if (strcmp(constructionMethodStr, "fromRays") == 0) |
---|
| 1055 | sConstructionMethod = FROM_RAYS; |
---|
| 1056 | else |
---|
| 1057 | { |
---|
| 1058 | cerr << "Wrong construction method " << constructionMethodStr << endl; |
---|
| 1059 | exit(1); |
---|
| 1060 | } |
---|
| 1061 | |
---|
| 1062 | Debug << "Construction method: " << constructionMethodStr << endl; |
---|
| 1063 | |
---|
[267] | 1064 | environment->GetIntValue("BspTree.Termination.maxDepth", sTermMaxDepth); |
---|
| 1065 | environment->GetIntValue("BspTree.Termination.maxPolygons", sTermMaxPolygons); |
---|
[297] | 1066 | environment->GetIntValue("BspTree.Termination.maxPolysForAxisAligned", |
---|
| 1067 | sTermMaxPolysForAxisAligned); |
---|
[267] | 1068 | environment->GetIntValue("BspTree.maxCandidates", sMaxCandidates); |
---|
[294] | 1069 | environment->GetIntValue("BspTree.splitPlaneStrategy", sSplitPlaneStrategy); |
---|
[267] | 1070 | |
---|
[302] | 1071 | // need kdtree criteria for axis aligned split |
---|
| 1072 | environment->GetFloatValue("MeshKdTree.Termination.ct_div_ci", sCt_div_ci);
|
---|
| 1073 | environment->GetFloatValue("MeshKdTree.splitBorder", sSplitBorder); |
---|
| 1074 | environment->GetFloatValue("MeshKdTree.Termination.maxCostRatio", sMaxCostRatio); |
---|
| 1075 | |
---|
[297] | 1076 | Debug << "BSP max depth: " << sTermMaxDepth << endl; |
---|
[267] | 1077 | Debug << "BSP max polys: " << sTermMaxPolygons << endl; |
---|
| 1078 | Debug << "BSP max candidates: " << sMaxCandidates << endl; |
---|
[297] | 1079 | |
---|
| 1080 | Debug << "Split plane strategy: "; |
---|
| 1081 | if (sSplitPlaneStrategy & NEXT_POLYGON) |
---|
| 1082 | Debug << "next polygon "; |
---|
| 1083 | if (sSplitPlaneStrategy & AXIS_ALIGNED) |
---|
| 1084 | Debug << "axis aligned "; |
---|
| 1085 | if (sSplitPlaneStrategy & LEAST_SPLITS) |
---|
| 1086 | Debug << "least splits "; |
---|
| 1087 | if (sSplitPlaneStrategy & BALANCED_POLYS) |
---|
| 1088 | Debug << "balanced polygons "; |
---|
| 1089 | if (sSplitPlaneStrategy & BALANCED_VIEW_CELLS) |
---|
| 1090 | Debug << "balanced view cells "; |
---|
| 1091 | if (sSplitPlaneStrategy & LARGEST_POLY_AREA) |
---|
| 1092 | Debug << "largest polygon area "; |
---|
| 1093 | if (sSplitPlaneStrategy & VERTICAL_AXIS) |
---|
| 1094 | Debug << "vertical axis "; |
---|
[267] | 1095 | |
---|
[297] | 1096 | Debug << endl; |
---|
[267] | 1097 | } |
---|
| 1098 | |
---|
[240] | 1099 | void BspTree::CollectLeaves(vector<BspLeaf *> &leaves) |
---|
| 1100 | { |
---|
| 1101 | stack<BspNode *> nodeStack; |
---|
| 1102 | nodeStack.push(mRoot); |
---|
| 1103 | |
---|
| 1104 | while (!nodeStack.empty()) |
---|
| 1105 | { |
---|
| 1106 | BspNode *node = nodeStack.top(); |
---|
| 1107 | |
---|
| 1108 | nodeStack.pop(); |
---|
| 1109 | |
---|
| 1110 | if (node->IsLeaf()) |
---|
| 1111 | { |
---|
| 1112 | BspLeaf *leaf = (BspLeaf *)node; |
---|
| 1113 | |
---|
| 1114 | leaves.push_back(leaf); |
---|
| 1115 | } else |
---|
| 1116 | { |
---|
| 1117 | BspInterior *interior = dynamic_cast<BspInterior *>(node); |
---|
| 1118 | nodeStack.push(interior->GetBack()); |
---|
| 1119 | nodeStack.push(interior->GetFront()); |
---|
| 1120 | } |
---|
| 1121 | } |
---|
[267] | 1122 | } |
---|
| 1123 | |
---|
| 1124 | AxisAlignedBox3 BspTree::GetBoundingBox() const |
---|
| 1125 | { |
---|
| 1126 | return mBox; |
---|
| 1127 | } |
---|
| 1128 | |
---|
| 1129 | BspNode *BspTree::GetRoot() const |
---|
| 1130 | { |
---|
| 1131 | return mRoot; |
---|
| 1132 | } |
---|
| 1133 | |
---|
| 1134 | bool BspTree::StorePolys() const |
---|
| 1135 | { |
---|
[304] | 1136 | return mStoreSplitPolys; |
---|
[267] | 1137 | } |
---|
| 1138 | |
---|
[235] | 1139 | void BspTree::EvaluateLeafStats(const BspTraversalData &data) |
---|
| 1140 | { |
---|
[239] | 1141 | // the node became a leaf -> evaluate stats for leafs |
---|
| 1142 | BspLeaf *leaf = dynamic_cast<BspLeaf *>(data.mNode); |
---|
[235] | 1143 | |
---|
[295] | 1144 | if (data.mDepth >= sTermMaxDepth) |
---|
[239] | 1145 | { |
---|
| 1146 | ++ mStat.maxDepthNodes; |
---|
| 1147 | } |
---|
[238] | 1148 | |
---|
[265] | 1149 | // store maximal and minimal depth |
---|
[239] | 1150 | if (data.mDepth > mStat.maxDepth) |
---|
| 1151 | mStat.maxDepth = data.mDepth; |
---|
[265] | 1152 | if (data.mDepth < mStat.minDepth) |
---|
| 1153 | mStat.minDepth = data.mDepth; |
---|
[235] | 1154 | |
---|
[267] | 1155 | // accumulate depth to compute average |
---|
[265] | 1156 | mStat.accumDepth += data.mDepth; |
---|
| 1157 | |
---|
| 1158 | if (leaf->mViewCell) |
---|
| 1159 | ++ mStat.viewCellLeaves; |
---|
| 1160 | |
---|
[239] | 1161 | #ifdef _DEBUG |
---|
[265] | 1162 | Debug << "BSP Traversal data. Depth: " << data.mDepth << " (max: " << mTermMaxDepth << "), #polygons: " << |
---|
[295] | 1163 | data.mPolygons->size() << " (max: " << sTermMaxPolygons << ")" << endl; |
---|
[239] | 1164 | #endif |
---|
[235] | 1165 | } |
---|
[241] | 1166 | |
---|
| 1167 | int BspTree::CastRay(Ray &ray) |
---|
| 1168 | { |
---|
| 1169 | int hits = 0; |
---|
| 1170 | |
---|
| 1171 | stack<BspRayTraversalData> tStack; |
---|
| 1172 | |
---|
| 1173 | float maxt = 1e6; |
---|
| 1174 | float mint = 0; |
---|
[311] | 1175 | |
---|
[241] | 1176 | Intersectable::NewMail(); |
---|
| 1177 | |
---|
| 1178 | // test with tree bounding box |
---|
| 1179 | if (!mBox.GetMinMaxT(ray, &mint, &maxt)) |
---|
[311] | 1180 | { |
---|
[241] | 1181 | return 0; |
---|
[311] | 1182 | } |
---|
[241] | 1183 | |
---|
| 1184 | if (mint < 0) |
---|
| 1185 | mint = 0; |
---|
| 1186 | |
---|
| 1187 | maxt += Limits::Threshold; |
---|
| 1188 | |
---|
| 1189 | Vector3 entp = ray.Extrap(mint); |
---|
| 1190 | Vector3 extp = ray.Extrap(maxt); |
---|
| 1191 | |
---|
| 1192 | BspNode *node = mRoot; |
---|
| 1193 | BspNode *farChild; |
---|
| 1194 | |
---|
[260] | 1195 | while (1) |
---|
[241] | 1196 | { |
---|
| 1197 | if (!node->IsLeaf()) |
---|
| 1198 | { |
---|
| 1199 | BspInterior *in = (BspInterior *) node; |
---|
| 1200 | |
---|
| 1201 | Plane3 *splitPlane = in->GetPlane(); |
---|
| 1202 | |
---|
| 1203 | float t = 0; |
---|
| 1204 | bool coplanar = false; |
---|
| 1205 | |
---|
| 1206 | int entSide = splitPlane->Side(entp); |
---|
| 1207 | int extSide = splitPlane->Side(extp); |
---|
| 1208 | |
---|
| 1209 | Vector3 intersection; |
---|
| 1210 | |
---|
| 1211 | if (entSide < 0) |
---|
| 1212 | { |
---|
[242] | 1213 | node = in->GetBack(); |
---|
| 1214 | |
---|
| 1215 | if(extSide <= 0) |
---|
[241] | 1216 | continue; |
---|
[242] | 1217 | |
---|
| 1218 | farChild = in->GetFront(); // plane splits ray |
---|
| 1219 | |
---|
[241] | 1220 | } else if (entSide > 0) |
---|
| 1221 | { |
---|
[242] | 1222 | node = in->GetFront(); |
---|
| 1223 | |
---|
| 1224 | if (extSide >= 0) |
---|
[241] | 1225 | continue; |
---|
[242] | 1226 | |
---|
| 1227 | farChild = in->GetBack(); // plane splits ray |
---|
[241] | 1228 | } |
---|
[242] | 1229 | else // ray and plane are coincident // WHAT TO DO IN THIS CASE ? |
---|
[241] | 1230 | { |
---|
[242] | 1231 | node = in->GetFront(); |
---|
[241] | 1232 | continue; |
---|
| 1233 | } |
---|
| 1234 | |
---|
[242] | 1235 | // push data for far child |
---|
[241] | 1236 | tStack.push(BspRayTraversalData(farChild, extp, maxt)); |
---|
| 1237 | |
---|
[242] | 1238 | // find intersection with plane between ray origin and exit point |
---|
| 1239 | extp = splitPlane->FindIntersection(ray.GetLoc(), extp, &maxt); |
---|
[308] | 1240 | } else // reached leaf => intersection with view cell |
---|
[241] | 1241 | { |
---|
| 1242 | BspLeaf *leaf = dynamic_cast<BspLeaf *>(node); |
---|
[308] | 1243 | |
---|
| 1244 | //ray.mBspLeaves.push_back(leaf); |
---|
[311] | 1245 | //Debug << "adding view cell" << leaf->mViewCell; |
---|
[308] | 1246 | if (!leaf->mViewCell->Mailed()) |
---|
[241] | 1247 | { |
---|
[308] | 1248 | ray.viewCells.push_back(leaf->mViewCell); |
---|
| 1249 | mViewCell->Mail(); |
---|
| 1250 | ++ hits; |
---|
| 1251 | } |
---|
[311] | 1252 | //Debug << "view cell added" << endl; |
---|
[309] | 1253 | // get the next node from the stack |
---|
[241] | 1254 | if (tStack.empty()) |
---|
| 1255 | break; |
---|
| 1256 | |
---|
| 1257 | entp = extp; |
---|
| 1258 | mint = maxt; |
---|
| 1259 | BspRayTraversalData &s = tStack.top(); |
---|
[242] | 1260 | |
---|
[241] | 1261 | node = s.mNode; |
---|
| 1262 | extp = s.mExitPoint; |
---|
| 1263 | maxt = s.mMaxT; |
---|
| 1264 | |
---|
| 1265 | tStack.pop(); |
---|
| 1266 | } |
---|
[260] | 1267 | } |
---|
[241] | 1268 | |
---|
[260] | 1269 | return hits; |
---|
[241] | 1270 | } |
---|
| 1271 | |
---|
[262] | 1272 | bool BspTree::Export(const string filename) |
---|
| 1273 | { |
---|
| 1274 | Exporter *exporter = Exporter::GetExporter(filename); |
---|
| 1275 | |
---|
| 1276 | if (exporter) |
---|
| 1277 | { |
---|
| 1278 | exporter->ExportBspTree(*this); |
---|
| 1279 | return true; |
---|
| 1280 | } |
---|
| 1281 | |
---|
| 1282 | return false; |
---|
| 1283 | } |
---|
[308] | 1284 | |
---|
| 1285 | void BspTree::CollectViewCells(BspNode *n, ViewCellContainer &viewCells) |
---|
| 1286 | { |
---|
| 1287 | stack<BspNode *> nodeStack; |
---|
| 1288 | |
---|
| 1289 | nodeStack.push(n); |
---|
| 1290 | |
---|
| 1291 | while (!nodeStack.empty()) |
---|
| 1292 | { |
---|
| 1293 | BspNode *node = nodeStack.top(); |
---|
| 1294 | nodeStack.pop(); |
---|
| 1295 | |
---|
| 1296 | if (node->IsLeaf()) |
---|
| 1297 | { |
---|
| 1298 | ViewCell *viewCell = dynamic_cast<BspLeaf *>(node)->mViewCell; |
---|
| 1299 | |
---|
| 1300 | if (!viewCell->Mailed()) |
---|
| 1301 | { |
---|
| 1302 | viewCell->Mail(); |
---|
| 1303 | viewCells.push_back(viewCell); |
---|
| 1304 | } |
---|
| 1305 | } |
---|
| 1306 | else |
---|
| 1307 | { |
---|
| 1308 | BspInterior *interior = dynamic_cast<BspInterior *>(node); |
---|
| 1309 | nodeStack.push(interior->mFront); |
---|
| 1310 | nodeStack.push(interior->mBack); |
---|
| 1311 | } |
---|
| 1312 | } |
---|
| 1313 | } |
---|
[245] | 1314 | //} // GtpVisibilityPreprocessor |
---|