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 | |
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15 | int BspTree::sTermMaxPolygons = 10; |
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16 | int BspTree::sTermMaxDepth = 20; |
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17 | int BspTree::sMaxCandidates = 10; |
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18 | int BspTree::sSplitPlaneStrategy = NEXT_POLYGON; |
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19 | int BspTree::sConstructionMethod = VIEW_CELLS; |
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20 | |
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21 | /** Evaluates split plane classification with respect to the plane's |
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22 | contribution for a balanced tree. |
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23 | */ |
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24 | float BspTree::sLeastSplitsTable[] = {0, 0, 1, 0}; |
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25 | /** Evaluates split plane classification with respect to the plane's |
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26 | contribution for a minimum number splits in the tree. |
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27 | */ |
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28 | float BspTree::sBalancedTreeTable[] = {-1, 1, 0, 0}; |
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29 | |
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30 | //int counter = 0; |
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31 | |
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32 | /****************************************************************/ |
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33 | /* class BspNode implementation */ |
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34 | /****************************************************************/ |
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35 | |
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36 | BspNode::BspNode(): mParent(NULL), mPolygons(NULL)//,mViewCellIdx(0) |
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37 | {} |
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38 | |
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39 | BspNode::BspNode(BspInterior *parent): mParent(parent), mPolygons(NULL)//,mViewCellIdx(0) |
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40 | {} |
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41 | |
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42 | BspNode::~BspNode() |
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43 | { |
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44 | if (mPolygons) |
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45 | { |
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46 | CLEAR_CONTAINER(*mPolygons); |
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47 | DEL_PTR(mPolygons); |
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48 | } |
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49 | } |
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50 | |
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51 | bool BspNode::IsRoot() const |
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52 | { |
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53 | return mParent == NULL; |
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54 | } |
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55 | |
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56 | BspInterior *BspNode::GetParent() |
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57 | { |
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58 | return mParent; |
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59 | } |
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60 | |
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61 | void BspNode::SetParent(BspInterior *parent) |
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62 | { |
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63 | mParent = parent; |
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64 | } |
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65 | |
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66 | PolygonContainer *BspNode::GetPolygons() |
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67 | { |
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68 | if (!mPolygons) |
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69 | mPolygons = new PolygonContainer(); |
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70 | |
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71 | return mPolygons; |
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72 | } |
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73 | |
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74 | void BspNode::ProcessPolygons(PolygonContainer *polys, bool storePolys) |
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75 | { |
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76 | if (storePolys) |
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77 | { |
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78 | while (!polys->empty()) |
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79 | { |
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80 | GetPolygons()->push_back(polys->back()); |
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81 | polys->pop_back(); |
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82 | } |
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83 | } |
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84 | else CLEAR_CONTAINER(*polys); |
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85 | } |
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86 | |
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87 | |
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88 | /****************************************************************/ |
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89 | /* class BspInterior implementation */ |
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90 | /****************************************************************/ |
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91 | |
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92 | |
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93 | BspInterior::BspInterior(const Plane3 &plane): |
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94 | mPlane(plane), mFront(NULL), mBack(NULL) |
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95 | {} |
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96 | |
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97 | bool BspInterior::IsLeaf() const |
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98 | { |
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99 | return false; |
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100 | } |
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101 | |
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102 | BspNode *BspInterior::GetBack() |
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103 | { |
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104 | return mBack; |
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105 | } |
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106 | |
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107 | BspNode *BspInterior::GetFront() |
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108 | { |
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109 | return mFront; |
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110 | } |
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111 | |
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112 | Plane3 *BspInterior::GetPlane() |
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113 | { |
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114 | return &mPlane; |
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115 | } |
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116 | |
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117 | void BspInterior::ReplaceChildLink(BspNode *oldChild, BspNode *newChild) |
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118 | { |
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119 | if (mBack == oldChild) |
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120 | mBack = newChild; |
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121 | else |
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122 | mFront = newChild; |
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123 | } |
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124 | |
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125 | void BspInterior::SetupChildLinks(BspNode *b, BspNode *f) |
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126 | { |
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127 | mBack = b; |
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128 | mFront = f; |
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129 | } |
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130 | |
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131 | void BspInterior::ProcessPolygon(Polygon3 **poly, const bool storePolys) |
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132 | { |
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133 | if (storePolys) |
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134 | GetPolygons()->push_back(*poly); |
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135 | else |
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136 | DEL_PTR(*poly); |
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137 | } |
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138 | |
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139 | void BspInterior::SplitPolygons(PolygonContainer *polys, |
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140 | PolygonContainer *frontPolys, |
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141 | PolygonContainer *backPolys, |
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142 | PolygonContainer *coincident, |
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143 | int &splits, |
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144 | bool storePolys) |
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145 | { |
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146 | Polygon3 *splitPoly = NULL; |
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147 | #ifdef _Debug |
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148 | Debug << "splitting polygons of node " << this << " with plane " << mPlane << endl; |
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149 | #endif |
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150 | while (!polys->empty()) |
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151 | { |
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152 | Polygon3 *poly = polys->back(); |
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153 | polys->pop_back(); |
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154 | |
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155 | //Debug << "New polygon with plane: " << poly->GetSupportingPlane() << "\n"; |
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156 | |
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157 | // get polygon classification |
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158 | int classification = poly->ClassifyPlane(mPlane); |
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159 | |
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160 | Polygon3 *front_piece = NULL; |
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161 | Polygon3 *back_piece = NULL; |
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162 | |
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163 | switch (classification) |
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164 | { |
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165 | case Polygon3::COINCIDENT: |
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166 | //Debug << "coincident" << endl; |
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167 | coincident->push_back(poly); |
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168 | break; |
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169 | case Polygon3::FRONT_SIDE: |
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170 | //Debug << "front" << endl; |
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171 | frontPolys->push_back(poly); |
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172 | break; |
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173 | case Polygon3::BACK_SIDE: |
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174 | //Debug << "back" << endl; |
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175 | backPolys->push_back(poly); |
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176 | break; |
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177 | case Polygon3::SPLIT: |
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178 | front_piece = new Polygon3(poly->mParent); |
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179 | back_piece = new Polygon3(poly->mParent); |
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180 | |
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181 | //-- split polygon into front and back part |
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182 | poly->Split(&mPlane, front_piece, back_piece); |
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183 | |
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184 | ++ splits; // increase number of splits |
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185 | // check if polygon still valid |
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186 | if (front_piece->mVertices.size() >= 3) |
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187 | frontPolys->push_back(front_piece); |
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188 | else |
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189 | DEL_PTR(front_piece); |
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190 | // check if polygon still valid |
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191 | if (back_piece->mVertices.size() >= 3) |
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192 | backPolys->push_back(back_piece); |
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193 | else |
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194 | DEL_PTR(back_piece); |
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195 | |
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196 | #ifdef _DEBUG |
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197 | Debug << "split " << *poly << endl << *front_piece << endl << *back_piece << endl; |
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198 | #endif |
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199 | ProcessPolygon(&poly, storePolys); |
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200 | |
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201 | break; |
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202 | default: |
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203 | Debug << "SHOULD NEVER COME HERE\n"; |
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204 | break; |
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205 | } |
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206 | } |
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207 | } |
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208 | |
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209 | /****************************************************************/ |
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210 | /* class BspLeaf implementation */ |
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211 | /****************************************************************/ |
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212 | BspLeaf::BspLeaf(): mViewCell(NULL) |
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213 | { |
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214 | } |
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215 | |
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216 | BspLeaf::BspLeaf(ViewCell *viewCell): mViewCell(viewCell) |
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217 | { |
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218 | } |
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219 | |
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220 | BspLeaf::BspLeaf(BspInterior *parent): BspNode(parent), mViewCell(NULL) |
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221 | {} |
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222 | |
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223 | BspLeaf::BspLeaf(BspInterior *parent, ViewCell *viewCell): |
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224 | BspNode(parent), mViewCell(viewCell) |
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225 | { |
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226 | } |
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227 | ViewCell *BspLeaf::GetViewCell() |
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228 | { |
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229 | return mViewCell; |
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230 | } |
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231 | |
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232 | void BspLeaf::SetViewCell(ViewCell *viewCell) |
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233 | { |
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234 | mViewCell = viewCell; |
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235 | } |
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236 | |
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237 | bool BspLeaf::IsLeaf() const |
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238 | { |
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239 | return true; |
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240 | } |
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241 | |
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242 | /****************************************************************/ |
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243 | /* class BspTree implementation */ |
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244 | /****************************************************************/ |
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245 | |
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246 | BspTree::BspTree(): |
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247 | mRoot(NULL), |
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248 | mVerticalAxis(Vector3(0, 0, 1)), |
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249 | //mStorePolys(true) |
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250 | mStorePolys(false) |
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251 | { |
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252 | Randomize(); // initialise random generator for heuristics |
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253 | } |
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254 | |
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255 | const BspTreeStatistics &BspTree::GetStatistics() const |
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256 | { |
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257 | return mStat; |
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258 | } |
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259 | |
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260 | void BspTreeStatistics::Print(ostream &app) const |
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261 | { |
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262 | app << "===== BspTree statistics ===============\n"; |
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263 | |
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264 | app << setprecision(4); |
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265 | |
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266 | app << "#N_RAYS Number of rays )\n" |
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267 | << rays << endl; |
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268 | app << "#N_DOMAINS ( Number of query domains )\n" |
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269 | << queryDomains <<endl; |
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270 | |
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271 | app << "#N_NODES ( Number of nodes )\n" << nodes << "\n"; |
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272 | |
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273 | app << "#N_INTERIORS ( Number of interior nodes )\n" << Interior() << "\n"; |
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274 | |
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275 | app << "#N_LEAVES ( Number of leaves )\n" << Leaves() << "\n"; |
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276 | |
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277 | app << "#N_SPLITS ( Number of splits )\n" << splits << "\n"; |
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278 | |
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279 | app << "#N_RAYREFS ( Number of rayRefs )\n" << |
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280 | rayRefs << "\n"; |
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281 | |
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282 | app << "#N_RAYRAYREFS ( Number of rayRefs / ray )\n" << |
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283 | rayRefs/(double)rays << "\n"; |
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284 | |
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285 | app << "#N_LEAFRAYREFS ( Number of rayRefs / leaf )\n" << |
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286 | rayRefs/(double)Leaves() << "\n"; |
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287 | |
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288 | app << "#N_MAXOBJECTREFS ( Max number of rayRefs / leaf )\n" << |
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289 | maxObjectRefs << "\n"; |
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290 | |
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291 | app << "#N_NONEMPTYRAYREFS ( Number of rayRefs in nonEmpty leaves / non empty leaf )\n" << |
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292 | rayRefsNonZeroQuery/(double)(Leaves() - zeroQueryNodes) << "\n"; |
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293 | |
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294 | app << "#N_LEAFDOMAINREFS ( Number of query domain Refs / leaf )\n" << |
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295 | objectRefs/(double)Leaves() << "\n"; |
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296 | |
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297 | app << "#N_PEMPTYLEAVES ( Percentage of leaves with zero query domains )\n"<< |
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298 | zeroQueryNodes*100/(double)Leaves() << endl; |
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299 | |
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300 | app << "#N_PMAXDEPTHLEAVES ( Percentage of leaves at maxdepth )\n"<< |
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301 | maxDepthNodes * 100 / (double)Leaves() << endl; |
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302 | |
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303 | app << "#N_PMAXDEPTH ( Maximal reached depth )\n" << maxDepth << endl; |
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304 | |
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305 | app << "#N_PMINDEPTH ( Minimal reached depth )\n" << minDepth << endl; |
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306 | |
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307 | app << "#AVGDEPTH ( average depth )\n" << AvgDepth() << endl; |
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308 | |
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309 | app << "#N_ADDED_RAYREFS ( Number of dynamically added ray references )\n"<< |
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310 | addedRayRefs << endl; |
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311 | |
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312 | app << "#N_REMOVED_RAYREFS ( Number of dynamically removed ray references )\n" << |
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313 | removedRayRefs << endl; |
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314 | |
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315 | app << "#N_INPUT_POLYGONS (number of input polygons )\n" << |
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316 | polys << endl; |
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317 | |
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318 | app << "#N_ROUTPUT_INPUT_POLYGONS ( ratio polygons after subdivision / input polygons )\n" << |
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319 | (polys + splits) / (double)polys << endl; |
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320 | |
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321 | app << "===== END OF BspTree statistics ==========\n"; |
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322 | } |
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323 | |
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324 | BspTree::~BspTree() |
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325 | { |
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326 | std::stack<BspNode *> tStack; |
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327 | |
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328 | tStack.push(mRoot); |
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329 | |
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330 | while (!tStack.empty()) |
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331 | { |
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332 | BspNode *node = tStack.top(); |
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333 | |
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334 | tStack.pop(); |
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335 | |
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336 | if (!node->IsLeaf()) |
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337 | { |
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338 | BspInterior *interior = dynamic_cast<BspInterior *>(node); |
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339 | |
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340 | // push the children on the stack (there are always two children) |
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341 | tStack.push(interior->GetBack()); |
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342 | tStack.push(interior->GetFront()); |
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343 | } |
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344 | |
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345 | DEL_PTR(node); |
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346 | } |
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347 | } |
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348 | |
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349 | void BspTree::InsertViewCell(ViewCell *viewCell) |
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350 | { |
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351 | PolygonContainer *polys = new PolygonContainer(); |
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352 | |
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353 | // extract polygons that guide the split process |
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354 | mStat.polys += AddMesh2Polygons(viewCell->GetMesh(), *polys); |
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355 | mBox.Include(viewCell->GetBox()); // add to BSP aabb |
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356 | |
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357 | InsertPolygons(polys); |
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358 | } |
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359 | |
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360 | void BspTree::InsertPolygons(PolygonContainer *polys, ViewCellContainer *viewCells) |
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361 | { |
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362 | std::stack<BspTraversalData> tStack; |
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363 | |
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364 | // traverse tree or create new one |
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365 | BspNode *firstNode = mRoot ? mRoot : new BspLeaf(); |
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366 | |
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367 | tStack.push(BspTraversalData(firstNode, polys, 0, NULL)); |
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368 | |
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369 | while (!tStack.empty()) |
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370 | { |
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371 | // filter polygons donw the tree |
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372 | BspTraversalData tData = tStack.top(); |
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373 | tStack.pop(); |
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374 | |
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375 | if (!tData.mNode->IsLeaf()) |
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376 | { |
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377 | BspInterior *interior = dynamic_cast<BspInterior *>(tData.mNode); |
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378 | |
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379 | //-- filter view cell polygons down the tree until a leaf is reached |
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380 | if ((int)tData.mPolygons->size() > 0) |
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381 | { |
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382 | PolygonContainer *frontPolys = new PolygonContainer(); |
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383 | PolygonContainer *backPolys = new PolygonContainer(); |
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384 | PolygonContainer coincident; |
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385 | |
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386 | int splits = 0; |
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387 | |
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388 | // split viecell polygons with respect to split plane |
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389 | interior->SplitPolygons(tData.mPolygons, |
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390 | frontPolys, |
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391 | backPolys, |
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392 | &coincident, |
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393 | splits, |
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394 | mStorePolys); |
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395 | |
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396 | // get view cell associated with the split polygon |
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397 | ViewCell *viewCell = (coincident.size() > 0) ? |
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398 | dynamic_cast<ViewCell *>(coincident.front()->mParent) : NULL; |
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399 | interior->ProcessPolygons(&coincident, mStorePolys); |
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400 | |
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401 | //Debug << "split node on level " << tData.mDepth << " bk: " << backPolys->size() << " frnt: " << frontPolys->size() << endl; |
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402 | mStat.splits += splits; |
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403 | |
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404 | // push the children on the stack |
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405 | tStack.push(BspTraversalData(interior->GetFront(), frontPolys, tData.mDepth + 1, NULL)); |
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406 | tStack.push(BspTraversalData(interior->GetBack(), backPolys, tData.mDepth + 1, viewCell)); |
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407 | } |
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408 | |
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409 | // cleanup |
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410 | DEL_PTR(tData.mPolygons); |
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411 | } |
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412 | else // reached leaf => subdivide current viewcell |
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413 | { |
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414 | if (tData.mPolygons->size() > 0) |
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415 | Debug << "Subdividing further: polygon size: " << (int)tData.mPolygons->size() << ", view cell: " << tData.mViewCell << endl; |
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416 | |
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417 | BspNode *root = Subdivide(tStack, tData, viewCells); |
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418 | |
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419 | if (!mRoot) // tree empty => new root |
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420 | mRoot = root; |
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421 | } |
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422 | } |
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423 | } |
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424 | |
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425 | int BspTree::AddMesh2Polygons(Mesh *mesh, PolygonContainer &polys, Intersectable *parent) |
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426 | { |
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427 | FaceContainer::const_iterator fi; |
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428 | int polysNum = 0; |
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429 | |
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430 | // copy the face data to polygons |
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431 | for (fi = mesh->mFaces.begin(); fi != mesh->mFaces.end(); ++ fi) |
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432 | { |
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433 | Polygon3 *poly = new Polygon3((*fi), mesh); |
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434 | poly->mParent = parent; // set parent intersectable |
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435 | polys.push_back(poly); |
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436 | |
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437 | if (!poly->CheckValid()) |
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438 | Debug << "Input polygon not valid: " << *poly << endl; |
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439 | |
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440 | ++ polysNum; |
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441 | } |
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442 | return polysNum; |
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443 | } |
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444 | |
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445 | int BspTree::Copy2PolygonSoup(const ViewCellContainer &viewCells, PolygonContainer &polys, int maxObjects) |
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446 | { |
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447 | int limit = (maxObjects > 0) ? Min((int)viewCells.size(), maxObjects) : (int)viewCells.size(); |
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448 | |
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449 | for (int i = 0; i < limit; ++i) |
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450 | {//if ((i == 12) ||(i==14)) |
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451 | if (viewCells[i]->GetMesh()) // copy the mesh data to polygons |
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452 | { |
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453 | mBox.Include(viewCells[i]->GetBox()); // add to BSP tree aabb |
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454 | AddMesh2Polygons(viewCells[i]->GetMesh(), polys, viewCells[i]); |
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455 | } |
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456 | } |
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457 | |
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458 | return (int)polys.size(); |
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459 | } |
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460 | |
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461 | int BspTree::Copy2PolygonSoup(const ObjectContainer &objects, PolygonContainer &polys, int maxObjects) |
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462 | { |
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463 | int limit = (maxObjects > 0) ? Min((int)objects.size(), maxObjects) : (int)objects.size(); |
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464 | |
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465 | for (int i = 0; i < limit; ++i) |
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466 | { |
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467 | Intersectable *object = objects[i];//*it; |
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468 | Mesh *mesh = NULL; |
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469 | |
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470 | switch (object->Type()) // extract the meshes |
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471 | { |
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472 | case Intersectable::MESH_INSTANCE: |
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473 | mesh = dynamic_cast<MeshInstance *>(object)->GetMesh(); |
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474 | break; |
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475 | case Intersectable::VIEWCELL: |
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476 | mesh = dynamic_cast<ViewCell *>(object)->GetMesh(); |
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477 | break; |
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478 | // TODO: handle transformed mesh instances |
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479 | default: |
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480 | break; |
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481 | } |
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482 | |
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483 | if (mesh) // copy the mesh data to polygons |
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484 | { |
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485 | mBox.Include(object->GetBox()); // add to BSP tree aabb |
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486 | AddMesh2Polygons(mesh, polys); |
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487 | } |
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488 | } |
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489 | |
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490 | return (int)polys.size(); |
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491 | } |
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492 | |
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493 | void BspTree::Construct(const ViewCellContainer &viewCells) |
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494 | { |
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495 | mStat.nodes = 1; |
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496 | mBox.Initialize(); // initialise bsp tree bounding box |
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497 | |
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498 | // copy view cell meshes into one big polygon soup |
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499 | PolygonContainer *polys = new PolygonContainer(); |
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500 | mStat.polys = Copy2PolygonSoup(viewCells, *polys); |
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501 | |
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502 | // construct tree from viewcell polygons |
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503 | Construct(polys); |
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504 | //Export("bsp.x3d"); |
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505 | } |
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506 | |
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507 | |
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508 | void BspTree::Construct(const ObjectContainer &objects, ViewCellContainer *viewCells) |
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509 | { |
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510 | mStat.nodes = 1; |
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511 | mBox.Initialize(); // initialise bsp tree bounding box |
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512 | |
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513 | PolygonContainer *polys = new PolygonContainer(); |
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514 | |
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515 | // copy mesh instance polygons into one big polygon soup |
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516 | mStat.polys = Copy2PolygonSoup(objects, *polys); |
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517 | |
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518 | // construct tree from polygon soup |
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519 | Construct(polys, viewCells); |
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520 | } |
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521 | |
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522 | void BspTree::Construct(const RayContainer &rays, ViewCellContainer *viewCells) |
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523 | { |
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524 | // TODO |
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525 | } |
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526 | |
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527 | void BspTree::Construct(PolygonContainer *polys, ViewCellContainer *viewCells) |
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528 | { |
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529 | std::stack<BspTraversalData> tStack; |
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530 | |
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531 | BspTraversalData tData(new BspLeaf(), polys, 0, NULL); |
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532 | |
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533 | tStack.push(tData); |
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534 | |
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535 | long startTime = GetTime(); |
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536 | Debug << "**** Contructing tree using objects ****\n"; |
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537 | while (!tStack.empty()) |
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538 | { |
---|
539 | tData = tStack.top(); |
---|
540 | tStack.pop(); |
---|
541 | |
---|
542 | // subdivide leaf node |
---|
543 | BspNode *root = Subdivide(tStack, tData, viewCells); |
---|
544 | |
---|
545 | // empty tree => new root corresponding to unbounded space |
---|
546 | if (!mRoot) |
---|
547 | mRoot = root; |
---|
548 | } |
---|
549 | |
---|
550 | Debug << "**** Finished tree construction ****\n"; |
---|
551 | Debug << "BSP tree contruction time: " << TimeDiff(startTime, GetTime())*1e-3 << "s" << endl; |
---|
552 | } |
---|
553 | |
---|
554 | |
---|
555 | BspNode *BspTree::Subdivide(BspTraversalStack &tStack, BspTraversalData &tData, |
---|
556 | ViewCellContainer *viewCells) |
---|
557 | { |
---|
558 | //-- terminate traversal |
---|
559 | if ((tData.mPolygons->size() <= sTermMaxPolygons) || (tData.mDepth >= sTermMaxDepth)) |
---|
560 | { |
---|
561 | #ifdef _DEBUG |
---|
562 | Debug << "subdivision terminated at depth " << tData.mDepth << ", #polys: " << (int)tData.mPolygons->size() << endl; |
---|
563 | #endif |
---|
564 | |
---|
565 | EvaluateLeafStats(tData); |
---|
566 | |
---|
567 | BspLeaf *leaf = dynamic_cast<BspLeaf *>(tData.mNode); |
---|
568 | |
---|
569 | //-- new viewcells are generated and added to each leaf |
---|
570 | if (viewCells) |
---|
571 | { |
---|
572 | ViewCell *viewCell = new ViewCell(); |
---|
573 | leaf->SetViewCell(viewCell); |
---|
574 | viewCells->push_back(viewCell); |
---|
575 | // Debug << "creating new viewcell" << endl; |
---|
576 | } |
---|
577 | //-- add viewcell stored in split polygon |
---|
578 | else if (tData.mViewCell) |
---|
579 | { |
---|
580 | if (leaf->GetViewCell()) |
---|
581 | Debug << "ERROR: leaf already has view cell " << endl;//leaf->mViewCellIdx << endl; |
---|
582 | |
---|
583 | //leaf->mViewCellIdx = counter; Debug << "insert view cell " << tData.mViewCell << endl; |
---|
584 | leaf->SetViewCell(dynamic_cast<ViewCell *>(tData.mViewCell)); |
---|
585 | } |
---|
586 | |
---|
587 | // remaining polygons are discarded or added to node |
---|
588 | tData.mNode->ProcessPolygons(tData.mPolygons, mStorePolys); |
---|
589 | DEL_PTR(tData.mPolygons); |
---|
590 | |
---|
591 | return tData.mNode; |
---|
592 | } |
---|
593 | |
---|
594 | //-- continue subdivision |
---|
595 | PolygonContainer *backPolys = new PolygonContainer(); |
---|
596 | PolygonContainer *frontPolys = new PolygonContainer(); |
---|
597 | PolygonContainer coincident; |
---|
598 | |
---|
599 | // create new interior node and two leaf nodes |
---|
600 | BspInterior *interior = SubdivideNode(dynamic_cast<BspLeaf *>(tData.mNode), |
---|
601 | tData.mPolygons, |
---|
602 | frontPolys, |
---|
603 | backPolys, |
---|
604 | &coincident); |
---|
605 | |
---|
606 | // view cell associated with the first split polygon |
---|
607 | ViewCell *viewCell = (coincident.size() > 0) ? |
---|
608 | dynamic_cast<ViewCell *>(coincident.front()->mParent) : NULL; |
---|
609 | interior->ProcessPolygons(&coincident, mStorePolys); |
---|
610 | |
---|
611 | // push the children on the stack |
---|
612 | // split polygon is only needed in the back leaf |
---|
613 | tStack.push(BspTraversalData(interior->GetFront(), frontPolys, tData.mDepth + 1, NULL)); |
---|
614 | tStack.push(BspTraversalData(interior->GetBack(), backPolys, tData.mDepth + 1, viewCell)); |
---|
615 | |
---|
616 | // cleanup |
---|
617 | DEL_PTR(tData.mNode); |
---|
618 | DEL_PTR(tData.mPolygons); |
---|
619 | |
---|
620 | return interior; |
---|
621 | } |
---|
622 | |
---|
623 | |
---|
624 | BspInterior *BspTree::SubdivideNode(BspLeaf *leaf, |
---|
625 | PolygonContainer *polys, |
---|
626 | PolygonContainer *frontPolys, |
---|
627 | PolygonContainer *backPolys, |
---|
628 | PolygonContainer *coincident) |
---|
629 | { |
---|
630 | mStat.nodes += 2; |
---|
631 | |
---|
632 | // add the new nodes to the tree + select subdivision plane |
---|
633 | BspInterior *interior = new BspInterior(SelectPlane(*polys)); |
---|
634 | |
---|
635 | #ifdef _DEBUG |
---|
636 | Debug << interior << endl; |
---|
637 | #endif |
---|
638 | |
---|
639 | // split polygon according to current plane |
---|
640 | int splits = 0; |
---|
641 | |
---|
642 | interior->SplitPolygons(polys, frontPolys, backPolys, coincident, splits, mStorePolys); |
---|
643 | |
---|
644 | mStat.splits += splits; |
---|
645 | |
---|
646 | BspInterior *parent = leaf->GetParent(); |
---|
647 | |
---|
648 | // replace a link from node's parent |
---|
649 | if (parent) |
---|
650 | { |
---|
651 | parent->ReplaceChildLink(leaf, interior); |
---|
652 | interior->SetParent(parent); |
---|
653 | } |
---|
654 | |
---|
655 | // and setup child links |
---|
656 | interior->SetupChildLinks(new BspLeaf(interior), new BspLeaf(interior)); |
---|
657 | |
---|
658 | return interior; |
---|
659 | } |
---|
660 | |
---|
661 | Plane3 BspTree::SelectPlane(const PolygonContainer &polys) const |
---|
662 | { |
---|
663 | if (polys.size() == 0) |
---|
664 | { |
---|
665 | Debug << "Warning: No split candidate available\n"; |
---|
666 | return Plane3(); |
---|
667 | } |
---|
668 | |
---|
669 | // simple strategy: just take next polygon |
---|
670 | if (sSplitPlaneStrategy & NEXT_POLYGON) |
---|
671 | { |
---|
672 | return polys.front()->GetSupportingPlane(); |
---|
673 | } |
---|
674 | |
---|
675 | if (sSplitPlaneStrategy & AXIS_ALIGNED) |
---|
676 | { |
---|
677 | AxisAlignedBox3 box; |
---|
678 | box.Initialize(); |
---|
679 | |
---|
680 | Polygon3::IncludeInBox(polys, box); |
---|
681 | |
---|
682 | int axis = box.Size().DrivingAxis();
|
---|
683 | Vector3 norm(0,0,0); norm[axis] = 1;
|
---|
684 |
|
---|
685 | Vector3 pt = (box.Min()[axis] + box.Max()[axis]) * 0.5f;
|
---|
686 |
|
---|
687 | return Plane3(norm, pt); |
---|
688 | } |
---|
689 | |
---|
690 | /*if (sSplitPlaneStrategy & DRIVING_AXIS) |
---|
691 | { |
---|
692 | const float dot_thres = 0.999; |
---|
693 | PolygonContainer::const_iterator it, it_end = polys->end(); |
---|
694 | |
---|
695 | for (it = polys->begin(); it != it_end; ++ it) |
---|
696 | { |
---|
697 | if (DotProd((*it)->GetSupportingPlane().mNormal, mVerticalAxis) > dot_thres) |
---|
698 | return (*it)->GetSupportingPlane(); |
---|
699 | } |
---|
700 | }*/ |
---|
701 | |
---|
702 | // use heuristics to find appropriate plane |
---|
703 | return SelectPlaneHeuristics(polys, sMaxCandidates); |
---|
704 | } |
---|
705 | |
---|
706 | Plane3 BspTree::SelectPlaneHeuristics(const PolygonContainer &polys, int maxTests) const |
---|
707 | { |
---|
708 | float lowestCost = MAX_FLOAT; |
---|
709 | int bestPlaneIdx = 0; |
---|
710 | |
---|
711 | int limit = Min((int)polys.size(), maxTests); |
---|
712 | |
---|
713 | for (int i = 0; i < limit; ++ i) |
---|
714 | { |
---|
715 | int candidateIdx = GetNextCandidateIdx((int)polys.size()); |
---|
716 | Plane3 candidatePlane = polys[candidateIdx]->GetSupportingPlane(); |
---|
717 | |
---|
718 | // evaluate current candidate |
---|
719 | float candidateCost = EvalSplitPlane(polys, candidatePlane); |
---|
720 | |
---|
721 | if (candidateCost < lowestCost) |
---|
722 | { |
---|
723 | bestPlaneIdx = candidateIdx; |
---|
724 | lowestCost = candidateCost; |
---|
725 | } |
---|
726 | } |
---|
727 | //Debug << "Plane lowest cost: " << lowestCost << endl; |
---|
728 | |
---|
729 | return polys[bestPlaneIdx]->GetSupportingPlane(); |
---|
730 | } |
---|
731 | |
---|
732 | int BspTree::GetNextCandidateIdx(const int max) const |
---|
733 | { |
---|
734 | return Random(max); // TODO: avoid testing same plane 2 times |
---|
735 | } |
---|
736 | |
---|
737 | float BspTree::EvalSplitPlane(const PolygonContainer &polys, const Plane3 &candidatePlane) const |
---|
738 | { |
---|
739 | float sumBalanced = 0, sumLeastSplits, drivingAxis = 0; |
---|
740 | |
---|
741 | if (sSplitPlaneStrategy & DRIVING_AXIS) |
---|
742 | { |
---|
743 | drivingAxis = (candidatePlane.mNormal.DrivingAxis() == mBox.Size().DrivingAxis()) ? |
---|
744 | 99.0f : 0.0f; // always prefer driving axis => very high value |
---|
745 | } |
---|
746 | if ((sSplitPlaneStrategy & BALANCED_TREE) || (sSplitPlaneStrategy & LEAST_SPLITS)) |
---|
747 | { |
---|
748 | PolygonContainer::const_iterator it, it_end = polys.end(); |
---|
749 | |
---|
750 | for (it = polys.begin(); it != it_end; ++ it) |
---|
751 | { |
---|
752 | int classification = (*it)->ClassifyPlane(candidatePlane); |
---|
753 | |
---|
754 | if (sSplitPlaneStrategy & BALANCED_TREE) |
---|
755 | sumBalanced += sBalancedTreeTable[classification]; |
---|
756 | |
---|
757 | if (sSplitPlaneStrategy & LEAST_SPLITS) |
---|
758 | sumLeastSplits += sLeastSplitsTable[classification]; |
---|
759 | } |
---|
760 | } |
---|
761 | |
---|
762 | // return linear combination of the sums |
---|
763 | return fabs(sumBalanced) + sumLeastSplits + drivingAxis; |
---|
764 | } |
---|
765 | |
---|
766 | void BspTree::ParseEnvironment() |
---|
767 | { |
---|
768 | environment->GetIntValue("BspTree.Termination.maxDepth", sTermMaxDepth); |
---|
769 | environment->GetIntValue("BspTree.Termination.maxPolygons", sTermMaxPolygons); |
---|
770 | environment->GetIntValue("BspTree.maxCandidates", sMaxCandidates); |
---|
771 | environment->GetIntValue("BspTree.splitPlaneStrategy", sSplitPlaneStrategy); |
---|
772 | |
---|
773 | Debug << "BSP max depth: " << sTermMaxDepth << endl; |
---|
774 | Debug << "BSP max polys: " << sTermMaxPolygons << endl; |
---|
775 | Debug << "BSP max candidates: " << sMaxCandidates << endl; |
---|
776 | |
---|
777 | //-- parse BSP tree construction method |
---|
778 | char constructionMethodStr[60]; |
---|
779 | |
---|
780 | environment->GetStringValue("BspTree.constructionMethod", constructionMethodStr); |
---|
781 | |
---|
782 | sConstructionMethod = BspTree::VIEW_CELLS; |
---|
783 | |
---|
784 | if (strcmp(constructionMethodStr, "viewCells") == 0) |
---|
785 | sConstructionMethod = BspTree::VIEW_CELLS; |
---|
786 | else if (strcmp(constructionMethodStr, "sceneGeometry") == 0) |
---|
787 | sConstructionMethod = BspTree::SCENE_GEOMETRY; |
---|
788 | else if (strcmp(constructionMethodStr, "rays") == 0) |
---|
789 | sConstructionMethod = BspTree::RAYS; |
---|
790 | else |
---|
791 | { |
---|
792 | cerr << "Wrong bsp construction method " << constructionMethodStr << endl; |
---|
793 | exit(1); |
---|
794 | } |
---|
795 | |
---|
796 | Debug << "Construction method: " << constructionMethodStr << endl; |
---|
797 | } |
---|
798 | |
---|
799 | void BspTree::CollectLeaves(vector<BspLeaf *> &leaves) |
---|
800 | { |
---|
801 | stack<BspNode *> nodeStack; |
---|
802 | nodeStack.push(mRoot); |
---|
803 | |
---|
804 | while (!nodeStack.empty()) |
---|
805 | { |
---|
806 | BspNode *node = nodeStack.top(); |
---|
807 | |
---|
808 | nodeStack.pop(); |
---|
809 | |
---|
810 | if (node->IsLeaf()) |
---|
811 | { |
---|
812 | BspLeaf *leaf = (BspLeaf *)node; |
---|
813 | |
---|
814 | leaves.push_back(leaf); |
---|
815 | } else |
---|
816 | { |
---|
817 | BspInterior *interior = dynamic_cast<BspInterior *>(node); |
---|
818 | nodeStack.push(interior->GetBack()); |
---|
819 | nodeStack.push(interior->GetFront()); |
---|
820 | } |
---|
821 | } |
---|
822 | } |
---|
823 | |
---|
824 | int BspTree::CollectLeafPvs() |
---|
825 | { |
---|
826 | int totalPvsSize = 0; |
---|
827 | |
---|
828 | stack<BspNode *> nodeStack; |
---|
829 | |
---|
830 | nodeStack.push(mRoot); |
---|
831 | |
---|
832 | while (!nodeStack.empty()) |
---|
833 | { |
---|
834 | BspNode *node = nodeStack.top(); |
---|
835 | |
---|
836 | nodeStack.pop(); |
---|
837 | |
---|
838 | if (node->IsLeaf()) |
---|
839 | { |
---|
840 | BspLeaf *leaf = dynamic_cast<BspLeaf *>(node); |
---|
841 | |
---|
842 | ViewCell *viewcell = leaf->GetViewCell(); |
---|
843 | |
---|
844 | if (!viewcell->Mailed()) |
---|
845 | { |
---|
846 | viewcell->Mail(); // what does mail mean? |
---|
847 | |
---|
848 | // add this node to pvs of all nodes it can see |
---|
849 | BspPvsMap::iterator ni; |
---|
850 | |
---|
851 | /* for (ni = object->mBspPvs.mEntries.begin(); ni != object->mKdPvs.mEntries.end(); ni++) |
---|
852 | { |
---|
853 | BspNode *node = (*ni).first; |
---|
854 | |
---|
855 | // $$ JB TEMPORARY solution -> should add object PVS or explictly computed |
---|
856 | // BSP tree PVS |
---|
857 | if (leaf->mBspPvs.AddNodeSample(node)) |
---|
858 | totalPvsSize++; |
---|
859 | }*/ |
---|
860 | } |
---|
861 | } else |
---|
862 | { |
---|
863 | // traverse tree |
---|
864 | BspInterior *interior = (BspInterior *)node; |
---|
865 | |
---|
866 | nodeStack.push(interior->GetFront()); |
---|
867 | nodeStack.push(interior->GetBack()); |
---|
868 | } |
---|
869 | } |
---|
870 | |
---|
871 | return totalPvsSize; |
---|
872 | } |
---|
873 | |
---|
874 | AxisAlignedBox3 BspTree::GetBoundingBox() const |
---|
875 | { |
---|
876 | return mBox; |
---|
877 | } |
---|
878 | |
---|
879 | BspNode *BspTree::GetRoot() const |
---|
880 | { |
---|
881 | return mRoot; |
---|
882 | } |
---|
883 | |
---|
884 | bool BspTree::StorePolys() const |
---|
885 | { |
---|
886 | return mStorePolys; |
---|
887 | } |
---|
888 | |
---|
889 | void BspTree::EvaluateLeafStats(const BspTraversalData &data) |
---|
890 | { |
---|
891 | // the node became a leaf -> evaluate stats for leafs |
---|
892 | BspLeaf *leaf = dynamic_cast<BspLeaf *>(data.mNode); |
---|
893 | |
---|
894 | if (data.mDepth >= sTermMaxDepth) |
---|
895 | { |
---|
896 | ++ mStat.maxDepthNodes; |
---|
897 | } |
---|
898 | |
---|
899 | // store maximal and minimal depth |
---|
900 | if (data.mDepth > mStat.maxDepth) |
---|
901 | mStat.maxDepth = data.mDepth; |
---|
902 | if (data.mDepth < mStat.minDepth) |
---|
903 | mStat.minDepth = data.mDepth; |
---|
904 | |
---|
905 | // accumulate depth to compute average |
---|
906 | mStat.accumDepth += data.mDepth; |
---|
907 | |
---|
908 | if (leaf->mViewCell) |
---|
909 | ++ mStat.viewCellLeaves; |
---|
910 | |
---|
911 | #ifdef _DEBUG |
---|
912 | Debug << "BSP Traversal data. Depth: " << data.mDepth << " (max: " << mTermMaxDepth << "), #polygons: " << |
---|
913 | data.mPolygons->size() << " (max: " << sTermMaxPolygons << ")" << endl; |
---|
914 | #endif |
---|
915 | } |
---|
916 | |
---|
917 | int BspTree::CastRay(Ray &ray) |
---|
918 | { |
---|
919 | int hits = 0; |
---|
920 | |
---|
921 | stack<BspRayTraversalData> tStack; |
---|
922 | |
---|
923 | float maxt = 1e6; |
---|
924 | float mint = 0; |
---|
925 | |
---|
926 | Intersectable::NewMail(); |
---|
927 | |
---|
928 | // test with tree bounding box |
---|
929 | if (!mBox.GetMinMaxT(ray, &mint, &maxt)) |
---|
930 | return 0; |
---|
931 | |
---|
932 | if (mint < 0) |
---|
933 | mint = 0; |
---|
934 | |
---|
935 | maxt += Limits::Threshold; |
---|
936 | |
---|
937 | Vector3 entp = ray.Extrap(mint); |
---|
938 | Vector3 extp = ray.Extrap(maxt); |
---|
939 | |
---|
940 | BspNode *node = mRoot; |
---|
941 | BspNode *farChild; |
---|
942 | |
---|
943 | while (1) |
---|
944 | { |
---|
945 | if (!node->IsLeaf()) |
---|
946 | { |
---|
947 | BspInterior *in = (BspInterior *) node; |
---|
948 | |
---|
949 | Plane3 *splitPlane = in->GetPlane(); |
---|
950 | |
---|
951 | float t = 0; |
---|
952 | bool coplanar = false; |
---|
953 | |
---|
954 | int entSide = splitPlane->Side(entp); |
---|
955 | int extSide = splitPlane->Side(extp); |
---|
956 | |
---|
957 | Vector3 intersection; |
---|
958 | |
---|
959 | if (entSide < 0) |
---|
960 | { |
---|
961 | node = in->GetBack(); |
---|
962 | |
---|
963 | if(extSide <= 0) |
---|
964 | continue; |
---|
965 | |
---|
966 | farChild = in->GetFront(); // plane splits ray |
---|
967 | |
---|
968 | } else if (entSide > 0) |
---|
969 | { |
---|
970 | node = in->GetFront(); |
---|
971 | |
---|
972 | if (extSide >= 0) |
---|
973 | continue; |
---|
974 | |
---|
975 | farChild = in->GetBack(); // plane splits ray |
---|
976 | } |
---|
977 | else // ray and plane are coincident // WHAT TO DO IN THIS CASE ? |
---|
978 | { |
---|
979 | node = in->GetFront(); |
---|
980 | continue; |
---|
981 | } |
---|
982 | |
---|
983 | //-- split |
---|
984 | |
---|
985 | // push data for far child |
---|
986 | tStack.push(BspRayTraversalData(farChild, extp, maxt)); |
---|
987 | |
---|
988 | // find intersection with plane between ray origin and exit point |
---|
989 | extp = splitPlane->FindIntersection(ray.GetLoc(), extp, &maxt); |
---|
990 | |
---|
991 | } else // compute intersections with objects in leaf |
---|
992 | { |
---|
993 | BspLeaf *leaf = dynamic_cast<BspLeaf *>(node); |
---|
994 | //ray.leaves.push_back(leaf); |
---|
995 | // TODO |
---|
996 | /*ObjectContainer::const_iterator mi; |
---|
997 | for (mi = leaf->mObjects.begin(); mi != leaf->mObjects.end(); ++mi) |
---|
998 | { |
---|
999 | Intersectable *object = *mi; |
---|
1000 | if (!object->Mailed()) |
---|
1001 | { |
---|
1002 | object->Mail(); |
---|
1003 | //ray.meshes.push_back(mesh); |
---|
1004 | hits += object->CastRay(ray); |
---|
1005 | } |
---|
1006 | }*/ |
---|
1007 | |
---|
1008 | if (hits && ray.GetType() == Ray::LOCAL_RAY) |
---|
1009 | if (ray.intersections[0].mT <= maxt) |
---|
1010 | break; |
---|
1011 | |
---|
1012 | // get the next node from the stack |
---|
1013 | if (tStack.empty()) |
---|
1014 | break; |
---|
1015 | |
---|
1016 | entp = extp; |
---|
1017 | mint = maxt; |
---|
1018 | BspRayTraversalData &s = tStack.top(); |
---|
1019 | |
---|
1020 | node = s.mNode; |
---|
1021 | extp = s.mExitPoint; |
---|
1022 | maxt = s.mMaxT; |
---|
1023 | |
---|
1024 | tStack.pop(); |
---|
1025 | } |
---|
1026 | } |
---|
1027 | |
---|
1028 | return hits; |
---|
1029 | } |
---|
1030 | |
---|
1031 | bool BspTree::Export(const string filename) |
---|
1032 | { |
---|
1033 | Exporter *exporter = Exporter::GetExporter(filename); |
---|
1034 | |
---|
1035 | if (exporter) |
---|
1036 | { |
---|
1037 | exporter->ExportBspTree(*this); |
---|
1038 | return true; |
---|
1039 | } |
---|
1040 | |
---|
1041 | return false; |
---|
1042 | } |
---|
1043 | //} // GtpVisibilityPreprocessor |
---|