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2 | // ================================================================
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3 | // $Id: lsds_kdtree.cpp,v 1.18 2005/04/16 09:34:21 bittner Exp $
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4 | // ****************************************************************
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5 | /**
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6 | The KD tree based LSDS
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7 | */
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8 | // Initial coding by
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9 | /**
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10 | @author Jiri Bittner
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11 | */
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12 |
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13 | // Standard headers
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14 | #include <stack>
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15 | #include <queue>
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16 | #include <algorithm>
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17 | #include <fstream>
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18 | #include <string>
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19 |
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20 | #include "RssTree.h"
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21 |
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22 | #include "Environment.h"
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23 | #include "VssRay.h"
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24 | #include "Intersectable.h"
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25 | #include "Ray.h"
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26 | #include "Containers.h"
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27 |
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28 | #define DEBUG_SPLIT_COST 0
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29 | #define DEBUG_SPLITS 0
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30 |
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31 | // Static variables
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32 | int
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33 | RssTreeLeaf::mailID = 0;
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34 |
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35 | inline void
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36 | AddObject2Pvs(Intersectable *object,
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37 | const int side,
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38 | int &pvsBack,
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39 | int &pvsFront)
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40 | {
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41 |
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42 | if (!object)
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43 | return;
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44 |
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45 | if (side <= 0) {
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46 | if (!object->Mailed() && !object->Mailed(2)) {
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47 | pvsBack++;
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48 | if (object->Mailed(1))
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49 | object->Mail(2);
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50 | else
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51 | object->Mail();
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52 | }
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53 | }
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54 |
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55 | if (side >= 0) {
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56 | if (!object->Mailed(1) && !object->Mailed(2)) {
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57 | pvsFront++;
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58 | if (object->Mailed())
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59 | object->Mail(2);
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60 | else
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61 | object->Mail(1);
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62 | }
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63 | }
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64 | }
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65 |
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66 | // Constructor
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67 | RssTree::RssTree()
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68 | {
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69 | environment->GetIntValue("RssTree.maxDepth", termMaxDepth);
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70 | environment->GetIntValue("RssTree.minPvs", termMinPvs);
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71 | environment->GetIntValue("RssTree.minRays", termMinRays);
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72 | environment->GetFloatValue("RssTree.maxRayContribution", termMaxRayContribution);
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73 | environment->GetFloatValue("RssTree.maxCostRatio", termMaxCostRatio);
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74 |
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75 | environment->GetFloatValue("RssTree.minSize", termMinSize);
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76 | termMinSize = sqr(termMinSize);
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77 |
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78 | environment->GetFloatValue("RssTree.refDirBoxMaxSize", refDirBoxMaxSize);
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79 | refDirBoxMaxSize = sqr(refDirBoxMaxSize);
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80 |
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81 | environment->GetFloatValue("RssTree.epsilon", epsilon);
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82 | environment->GetFloatValue("RssTree.ct_div_ci", ct_div_ci);
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83 |
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84 | environment->GetFloatValue("RssTree.maxTotalMemory", maxTotalMemory);
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85 | environment->GetFloatValue("RssTree.maxStaticMemory", maxStaticMemory);
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86 |
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87 |
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88 |
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89 |
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90 | float refDirAngle;
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91 | environment->GetFloatValue("RssTree.refDirAngle", refDirAngle);
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92 |
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93 | environment->GetIntValue("RssTree.accessTimeThreshold", accessTimeThreshold);
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94 | //= 1000;
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95 | environment->GetIntValue("RssTree.minCollapseDepth", minCollapseDepth);
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96 | // int minCollapseDepth = 4;
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97 |
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98 | // pRefDirThresh = cos(0.5*M_PI - M_PI*refDirAngle/180.0);
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99 | // cosRefDir = cos(M_PI*refDirAngle/180.0);
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100 | // sinRefDir = sin(M_PI*refDirAngle/180.0);
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101 |
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102 |
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103 | // split type
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104 | char sname[128];
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105 | environment->GetStringValue("RssTree.splitType", sname);
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106 | string name(sname);
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107 |
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108 | if (name.compare("regular") == 0)
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109 | splitType = ESplitRegular;
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110 | else
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111 | if (name.compare("heuristic") == 0)
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112 | splitType = ESplitHeuristic;
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113 | else
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114 | if (name.compare("hybrid") == 0)
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115 | splitType = ESplitHybrid;
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116 | else {
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117 | cerr<<"Invalid RssTree split type "<<name<<endl;
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118 | exit(1);
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119 | }
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120 |
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121 | environment->GetBoolValue("RssTree.randomize", randomize);
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122 | environment->GetBoolValue("RssTree.splitUseOnlyDrivingAxis", mSplitUseOnlyDrivingAxis);
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123 | environment->GetBoolValue("RssTree.useRss", mUseRss);
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124 |
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125 | environment->GetBoolValue("RssTree.interleaveDirSplits", mInterleaveDirSplits);
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126 | environment->GetIntValue("RssTree.dirSplitDepth", mDirSplitDepth);
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127 |
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128 | root = NULL;
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129 |
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130 | splitCandidates = new vector<SortableEntry>;
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131 | }
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132 |
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133 |
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134 | RssTree::~RssTree()
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135 | {
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136 | if (root)
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137 | delete root;
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138 | }
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139 |
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140 |
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141 |
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142 |
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143 | void
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144 | RssStatistics::Print(ostream &app) const
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145 | {
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146 | app << "===== RssTree statistics ===============\n";
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147 |
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148 | app << "#N_RAYS ( Number of rays )\n"
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149 | << rays <<endl;
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150 |
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151 | app << "#N_INITPVS ( Initial PVS size )\n"
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152 | << initialPvsSize <<endl;
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153 |
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154 | app << "#N_NODES ( Number of nodes )\n" << nodes << "\n";
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155 |
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156 | app << "#N_LEAVES ( Number of leaves )\n" << Leaves() << "\n";
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157 |
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158 | app << "#N_SPLITS ( Number of splits in axes x y z dx dy dz \n";
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159 | for (int i=0; i<7; i++)
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160 | app << splits[i] <<" ";
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161 | app <<endl;
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162 |
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163 | app << "#N_RAYREFS ( Number of rayRefs )\n" <<
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164 | rayRefs << "\n";
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165 |
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166 | app << "#N_RAYRAYREFS ( Number of rayRefs / ray )\n" <<
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167 | rayRefs/(double)rays << "\n";
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168 |
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169 | app << "#N_LEAFRAYREFS ( Number of rayRefs / leaf )\n" <<
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170 | rayRefs/(double)Leaves() << "\n";
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171 |
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172 | app << "#N_MAXRAYREFS ( Max number of rayRefs / leaf )\n" <<
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173 | maxRayRefs << "\n";
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174 |
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175 |
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176 | // app << setprecision(4);
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177 |
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178 | app << "#N_PMAXDEPTHLEAVES ( Percentage of leaves at maxdepth )\n"<<
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179 | maxDepthNodes*100/(double)Leaves()<<endl;
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180 |
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181 | app << "#N_PMINPVSLEAVES ( Percentage of leaves with minCost )\n"<<
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182 | minPvsNodes*100/(double)Leaves()<<endl;
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183 |
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184 | app << "#N_PMINRAYSLEAVES ( Percentage of leaves with minCost )\n"<<
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185 | minRaysNodes*100/(double)Leaves()<<endl;
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186 |
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187 | app << "#N_PMINSIZELEAVES ( Percentage of leaves with minSize )\n"<<
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188 | minSizeNodes*100/(double)Leaves()<<endl;
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189 |
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190 | app << "#N_PMAXRAYCONTRIBLEAVES ( Percentage of leaves with maximal ray contribution )\n"<<
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191 | maxRayContribNodes*100/(double)Leaves()<<endl;
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192 |
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193 | app << "#N_PMAXCOSTRATIOLEAVES ( Percentage of leaves with max cost ratio )\n"<<
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194 | maxCostRatioNodes*100/(double)Leaves()<<endl;
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195 |
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196 | app << "#N_ADDED_RAYREFS (Number of dynamically added ray references )\n"<<
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197 | addedRayRefs<<endl;
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198 |
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199 | app << "#N_REMOVED_RAYREFS (Number of dynamically removed ray references )\n"<<
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200 | removedRayRefs<<endl;
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201 |
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202 | // app << setprecision(4);
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203 |
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204 | app << "#N_CTIME ( Construction time [s] )\n"
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205 | << Time() << " \n";
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206 |
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207 | app << "===== END OF RssTree statistics ==========\n";
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208 |
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209 | }
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210 |
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211 |
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212 | void
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213 | RssTreeLeaf::UpdatePvsSize()
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214 | {
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215 | if (!mValidPvs) {
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216 | Intersectable::NewMail();
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217 | int pvsSize = 0;
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218 | for(RssTreeNode::RayInfoContainer::iterator ri = rays.begin();
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219 | ri != rays.end();
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220 | ri++)
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221 | if ((*ri).mRay->IsActive()) {
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222 | Intersectable *object;
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223 | #if BIDIRECTIONAL_RAY
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224 | object = (*ri).mRay->mOriginObject;
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225 | if (object && !object->Mailed()) {
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226 | pvsSize++;
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227 | object->Mail();
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228 | }
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229 | #endif
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230 | object = (*ri).mRay->mTerminationObject;
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231 | if (object && !object->Mailed()) {
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232 | pvsSize++;
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233 | object->Mail();
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234 | }
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235 | }
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236 | ComputeEntropyImportance();
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237 |
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238 | mPvsSize = pvsSize;
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239 | mValidPvs = true;
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240 | }
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241 | }
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242 |
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243 | bool
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244 | RssTree::ClipRay(
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245 | RssTreeNode::RayInfo &rayInfo,
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246 | const AxisAlignedBox3 &box
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247 | )
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248 | {
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249 | float tmin, tmax;
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250 | static Ray ray;
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251 | ray.Init(rayInfo.mRay->GetOrigin(), rayInfo.mRay->GetDir(), Ray::LINE_SEGMENT);
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252 | box.ComputeMinMaxT(ray, &tmin, &tmax);
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253 | if (tmin >= tmax)
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254 | return false;
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255 |
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256 | // now check if the ray origin lies inside the box
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257 | if ( tmax < rayInfo.mRay->GetSize() ) {
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258 | // this ray does not leave the box
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259 | rayInfo.mRay->SetupEndPoints(
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260 | ray.Extrap(tmax),
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261 | rayInfo.mRay->mTermination
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262 | );
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263 | return true;
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264 | }
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265 |
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266 | return false;
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267 | }
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268 |
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269 |
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270 | void
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271 | RssTree::Construct(
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272 | VssRayContainer &rays,
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273 | // forced bounding box is only used when computing from-box
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274 | // visibility
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275 | AxisAlignedBox3 *forcedBoundingBox
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276 | )
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277 | {
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278 | stat.Start();
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279 |
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280 | maxMemory = maxStaticMemory;
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281 |
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282 | if (root)
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283 | delete root;
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284 |
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285 | root = new RssTreeLeaf(NULL, rays.size());
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286 | // first construct a leaf that will get subdivide
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287 | RssTreeLeaf *leaf = (RssTreeLeaf *) root;
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288 |
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289 | stat.nodes = 1;
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290 |
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291 | bbox.Initialize();
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292 | dirBBox.Initialize();
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293 |
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294 | if (mUseRss)
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295 | forcedBoundingBox = NULL;
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296 |
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297 | for(VssRayContainer::const_iterator ri = rays.begin();
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298 | ri != rays.end();
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299 | ri++) {
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300 |
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301 | RssTreeNode::RayInfo info(*ri);
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302 | if (forcedBoundingBox)
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303 | if (!ClipRay(info, *forcedBoundingBox))
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304 | continue;
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305 |
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306 | leaf->AddRay(info);
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307 |
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308 | bbox.Include((*ri)->GetOrigin());
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309 | bbox.Include((*ri)->GetTermination());
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310 |
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311 |
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312 | dirBBox.Include(Vector3(
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313 | (*ri)->GetDirParametrization(0),
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314 | (*ri)->GetDirParametrization(1),
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315 | 0
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316 | )
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317 | );
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318 | }
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319 |
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320 |
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321 | if ( forcedBoundingBox )
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322 | bbox = *forcedBoundingBox;
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323 |
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324 | cout<<"Bbox = "<<bbox<<endl;
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325 | cout<<"Dirr Bbox = "<<dirBBox<<endl;
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326 |
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327 | stat.rays = leaf->rays.size();
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328 | leaf->UpdatePvsSize();
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329 | leaf->ComputeEntropyImportance();
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330 |
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331 | stat.initialPvsSize = leaf->GetPvsSize();
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332 | // Subdivide();
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333 | root = Subdivide(TraversalData(leaf, bbox, 0));
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334 |
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335 | if (splitCandidates) {
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336 | // force realease of this vector
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337 | delete splitCandidates;
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338 | splitCandidates = new vector<SortableEntry>;
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339 | }
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340 |
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341 | stat.Stop();
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342 |
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343 | stat.Print(cout);
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344 | cout<<"#Total memory="<<GetMemUsage()<<endl;
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345 |
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346 | }
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347 |
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348 | int
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349 | RssTree::UpdateSubdivision()
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350 | {
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351 | priority_queue<TraversalData> tStack;
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352 | // stack<TraversalData> tStack;
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353 |
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354 | tStack.push(TraversalData(root, bbox, 0));
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355 |
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356 | AxisAlignedBox3 backBox;
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357 | AxisAlignedBox3 frontBox;
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358 |
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359 | maxMemory = maxTotalMemory;
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360 | int subdivided = 0;
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361 | int lastMem = 0;
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362 | while (!tStack.empty()) {
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363 |
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364 | float mem = GetMemUsage();
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365 |
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366 | if ( lastMem/10 != ((int)mem)/10) {
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367 | cout<<mem<<" MB"<<endl;
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368 | }
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369 | lastMem = (int)mem;
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370 |
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371 | if ( mem > maxMemory ) {
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372 | // count statistics on unprocessed leafs
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373 | while (!tStack.empty()) {
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374 | // EvaluateLeafStats(tStack.top());
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375 | tStack.pop();
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376 | }
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377 | break;
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378 | }
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379 |
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380 | TraversalData data = tStack.top();
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381 | tStack.pop();
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382 |
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383 | if (data.node->IsLeaf()) {
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384 | RssTreeNode *node = SubdivideNode((RssTreeLeaf *) data.node,
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385 | data.bbox,
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386 | backBox,
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387 | frontBox
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388 | );
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389 | if (!node->IsLeaf()) {
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390 | subdivided++;
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391 | RssTreeInterior *interior = (RssTreeInterior *) node;
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392 | // push the children on the stack
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393 | tStack.push(TraversalData(interior->back, backBox, data.depth+1));
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394 | tStack.push(TraversalData(interior->front, frontBox, data.depth+1));
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395 | } else {
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396 | // EvaluateLeafStats(data);
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397 | }
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398 | } else {
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399 | RssTreeInterior *interior = (RssTreeInterior *) data.node;
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400 | tStack.push(TraversalData(interior->back, GetBBox(interior->back), data.depth+1));
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401 | tStack.push(TraversalData(interior->front, GetBBox(interior->front), data.depth+1));
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402 | }
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403 | }
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404 | return subdivided;
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405 | }
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406 |
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407 |
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408 | RssTreeNode *
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409 | RssTree::Subdivide(const TraversalData &tdata)
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410 | {
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411 | RssTreeNode *result = NULL;
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412 |
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413 | priority_queue<TraversalData> tStack;
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414 | // stack<TraversalData> tStack;
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415 |
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416 | tStack.push(tdata);
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417 |
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418 | AxisAlignedBox3 backBox;
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419 | AxisAlignedBox3 frontBox;
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420 |
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421 |
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422 | int lastMem = 0;
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423 | while (!tStack.empty()) {
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424 |
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425 | float mem = GetMemUsage();
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426 |
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427 | if ( lastMem/10 != ((int)mem)/10) {
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428 | cout<<mem<<" MB"<<endl;
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429 | }
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430 | lastMem = (int)mem;
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431 |
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432 | if ( mem > maxMemory ) {
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433 | // count statistics on unprocessed leafs
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434 | while (!tStack.empty()) {
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435 | EvaluateLeafStats(tStack.top());
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436 | tStack.pop();
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437 | }
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438 | break;
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439 | }
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440 |
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441 | TraversalData data = tStack.top();
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442 | tStack.pop();
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443 |
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444 | #if DEBUG_SPLITS
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445 | Debug<<"#Splitting node"<<endl;
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446 | data.node->Print(Debug);
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447 | #endif
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448 | RssTreeNode *node = SubdivideNode((RssTreeLeaf *) data.node,
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449 | data.bbox,
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450 | backBox,
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451 | frontBox
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452 | );
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453 |
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454 |
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455 | if (result == NULL)
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456 | result = node;
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457 |
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458 | if (!node->IsLeaf()) {
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459 |
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460 | RssTreeInterior *interior = (RssTreeInterior *) node;
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461 | // push the children on the stack
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462 | tStack.push(TraversalData(interior->back, backBox, data.depth+1));
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463 | tStack.push(TraversalData(interior->front, frontBox, data.depth+1));
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464 |
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465 | #if DEBUG_SPLITS
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466 | Debug<<"#New nodes"<<endl;
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467 | interior->back->Print(Debug);
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468 | interior->front->Print(Debug);
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469 | Debug<<"#####################################"<<endl;
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470 | #endif
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471 |
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472 | } else {
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473 | EvaluateLeafStats(data);
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474 | }
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475 | }
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476 |
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477 | return result;
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478 | }
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479 |
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480 |
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481 | // returns selected plane for subdivision
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482 | int
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483 | RssTree::SelectPlane(
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484 | RssTreeLeaf *leaf,
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485 | const AxisAlignedBox3 &box,
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486 | float &position,
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487 | int &raysBack,
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488 | int &raysFront,
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489 | int &pvsBack,
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490 | int &pvsFront
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491 | )
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492 | {
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493 |
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494 | int minDirDepth = 6;
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495 | int axis;
|
---|
496 | float costRatio;
|
---|
497 |
|
---|
498 | costRatio = BestCostRatio(leaf,
|
---|
499 | axis,
|
---|
500 | position,
|
---|
501 | raysBack,
|
---|
502 | raysFront,
|
---|
503 | pvsBack,
|
---|
504 | pvsFront
|
---|
505 | );
|
---|
506 | #if DEBUG_SPLIT_COST
|
---|
507 | cout<<axis<<" r="<<costRatio<<endl;
|
---|
508 | #endif
|
---|
509 | if (costRatio > termMaxCostRatio) {
|
---|
510 | // cout<<"Too big cost ratio "<<costRatio<<endl;
|
---|
511 | stat.maxCostRatioNodes++;
|
---|
512 | return -1;
|
---|
513 | }
|
---|
514 |
|
---|
515 | #if 0
|
---|
516 | cout<<
|
---|
517 | "pvs="<<leaf->mPvsSize<<
|
---|
518 | " rays="<<leaf->rays.size()<<
|
---|
519 | " rc="<<leaf->GetAvgRayContribution()<<
|
---|
520 | " axis="<<axis<<endl;
|
---|
521 | #endif
|
---|
522 |
|
---|
523 | return axis;
|
---|
524 | }
|
---|
525 |
|
---|
526 |
|
---|
527 | float
|
---|
528 | RssTree::GetCostRatio(
|
---|
529 | RssTreeLeaf *leaf,
|
---|
530 | const int axis,
|
---|
531 | const float position,
|
---|
532 | const int raysBack,
|
---|
533 | const int raysFront,
|
---|
534 | const int pvsBack,
|
---|
535 | const int pvsFront
|
---|
536 | )
|
---|
537 | {
|
---|
538 | bool costImportance = true;
|
---|
539 |
|
---|
540 | float ratio;
|
---|
541 | AxisAlignedBox3 box;
|
---|
542 | float minBox, maxBox;
|
---|
543 |
|
---|
544 | if (axis < 3) {
|
---|
545 | box = GetBBox(leaf);
|
---|
546 | minBox = box.Min(axis);
|
---|
547 | maxBox = box.Max(axis);
|
---|
548 | } else {
|
---|
549 | box = GetDirBBox(leaf);
|
---|
550 | minBox = box.Min(axis-3);
|
---|
551 | maxBox = box.Max(axis-3);
|
---|
552 | }
|
---|
553 |
|
---|
554 | float sizeBox = maxBox - minBox;
|
---|
555 |
|
---|
556 | int pvsSize = leaf->GetPvsSize();
|
---|
557 |
|
---|
558 | if (!costImportance) {
|
---|
559 | // float sum = raysBack*(position - minBox) + raysFront*(maxBox - position);
|
---|
560 | float sum = pvsBack*(position - minBox) + pvsFront*(maxBox - position);
|
---|
561 | float newCost = ct_div_ci + sum/sizeBox;
|
---|
562 | float oldCost = pvsSize;
|
---|
563 | ratio = newCost/oldCost;
|
---|
564 | } else {
|
---|
565 | // importance based cost
|
---|
566 | #if 0
|
---|
567 | float newContrib =
|
---|
568 | ((position - minBox)*sqr(pvsBack/(raysBack + Limits::Small)) +
|
---|
569 | (maxBox - position)*sqr(pvsFront/(raysFront + Limits::Small)))/sizeBox;
|
---|
570 |
|
---|
571 | // float newContrib =
|
---|
572 | // sqr(pvsBack/(raysBack + Limits::Small)) +
|
---|
573 | // sqr(pvsFront/(raysFront + Limits::Small));
|
---|
574 | float oldContrib = sqr(leaf->GetAvgRayContribution());
|
---|
575 | ratio = oldContrib/newContrib;
|
---|
576 | #else
|
---|
577 | #if 1
|
---|
578 | float newCost = raysBack*pvsBack + raysFront*pvsFront;
|
---|
579 | float oldCost = leaf->rays.size()*pvsSize;
|
---|
580 | ratio = newCost/oldCost;
|
---|
581 | #else
|
---|
582 | #if 0
|
---|
583 | float newCost = (pvsBack + pvsFront)*0.5f;
|
---|
584 | float oldCost = pvsSize;
|
---|
585 | ratio = newCost/oldCost;
|
---|
586 | #else
|
---|
587 | float newCost = abs(raysBack - raysFront);
|
---|
588 | float oldCost = leaf->rays.size();
|
---|
589 | ratio = newCost/oldCost;
|
---|
590 | #endif
|
---|
591 | #endif
|
---|
592 | #endif
|
---|
593 | }
|
---|
594 |
|
---|
595 | return ratio;
|
---|
596 | }
|
---|
597 |
|
---|
598 |
|
---|
599 | float
|
---|
600 | RssTree::EvalCostRatio(
|
---|
601 | RssTreeLeaf *leaf,
|
---|
602 | const int axis,
|
---|
603 | const float position,
|
---|
604 | int &raysBack,
|
---|
605 | int &raysFront,
|
---|
606 | int &pvsBack,
|
---|
607 | int &pvsFront
|
---|
608 | )
|
---|
609 | {
|
---|
610 | raysBack = 0;
|
---|
611 | raysFront = 0;
|
---|
612 | pvsFront = 0;
|
---|
613 | pvsBack = 0;
|
---|
614 |
|
---|
615 |
|
---|
616 | Intersectable::NewMail(3);
|
---|
617 |
|
---|
618 | if (axis <= RssTreeNode::SPLIT_Z) {
|
---|
619 | // this is the main ray classification loop!
|
---|
620 | for(RssTreeNode::RayInfoContainer::iterator ri = leaf->rays.begin();
|
---|
621 | ri != leaf->rays.end();
|
---|
622 | ri++)
|
---|
623 | if ((*ri).mRay->IsActive()) {
|
---|
624 |
|
---|
625 | // determine the side of this ray with respect to the plane
|
---|
626 | int side = (*ri).ComputeRaySide(axis, position);
|
---|
627 | // (*ri).mRay->mSide = side;
|
---|
628 |
|
---|
629 | if (side <= 0)
|
---|
630 | raysBack++;
|
---|
631 |
|
---|
632 | if (side >= 0)
|
---|
633 | raysFront++;
|
---|
634 |
|
---|
635 | AddObject2Pvs((*ri).mRay->mTerminationObject, side, pvsBack, pvsFront);
|
---|
636 | }
|
---|
637 |
|
---|
638 | } else {
|
---|
639 |
|
---|
640 | // directional split
|
---|
641 | for(RssTreeNode::RayInfoContainer::iterator ri = leaf->rays.begin();
|
---|
642 | ri != leaf->rays.end();
|
---|
643 | ri++)
|
---|
644 | if ((*ri).mRay->IsActive()) {
|
---|
645 |
|
---|
646 | // determine the side of this ray with respect to the plane
|
---|
647 | int side;
|
---|
648 | if ((*ri).mRay->GetDirParametrization(axis - 3) <= position)
|
---|
649 | side = -1;
|
---|
650 | else
|
---|
651 | side = 1;
|
---|
652 |
|
---|
653 | if (side <= 0)
|
---|
654 | raysBack++;
|
---|
655 |
|
---|
656 | if (side >= 0)
|
---|
657 | raysFront++;
|
---|
658 |
|
---|
659 | // (*ri).mRay->mSide = side;
|
---|
660 | AddObject2Pvs((*ri).mRay->mTerminationObject, side, pvsBack, pvsFront);
|
---|
661 |
|
---|
662 | }
|
---|
663 | }
|
---|
664 |
|
---|
665 | float ratio = GetCostRatio(
|
---|
666 | leaf,
|
---|
667 | axis,
|
---|
668 | position,
|
---|
669 | raysBack,
|
---|
670 | raysFront,
|
---|
671 | pvsBack,
|
---|
672 | pvsFront);
|
---|
673 |
|
---|
674 | // cout<<axis<<" "<<pvsSize<<" "<<pvsBack<<" "<<pvsFront<<endl;
|
---|
675 | // float oldCost = leaf->rays.size();
|
---|
676 |
|
---|
677 | // cout<<"ratio="<<ratio<<endl;
|
---|
678 |
|
---|
679 | return ratio;
|
---|
680 | }
|
---|
681 |
|
---|
682 | float
|
---|
683 | RssTree::BestCostRatio(
|
---|
684 | RssTreeLeaf *leaf,
|
---|
685 | int &axis,
|
---|
686 | float &position,
|
---|
687 | int &raysBack,
|
---|
688 | int &raysFront,
|
---|
689 | int &pvsBack,
|
---|
690 | int &pvsFront
|
---|
691 | )
|
---|
692 | {
|
---|
693 | int nRaysBack[6], nRaysFront[6];
|
---|
694 | int nPvsBack[6], nPvsFront[6];
|
---|
695 | float nPosition[6];
|
---|
696 | float nCostRatio[6];
|
---|
697 | int bestAxis = -1;
|
---|
698 |
|
---|
699 | AxisAlignedBox3 sBox = GetBBox(leaf);
|
---|
700 | AxisAlignedBox3 dBox = GetDirBBox(leaf);
|
---|
701 | // int sAxis = box.Size().DrivingAxis();
|
---|
702 | int sAxis = sBox.Size().DrivingAxis();
|
---|
703 | int dAxis = dBox.Size().DrivingAxis() + 3;
|
---|
704 |
|
---|
705 |
|
---|
706 | float dirSplitBoxSize = 0.01f;
|
---|
707 | bool allowDirSplit = Magnitude(sBox.Size())*dirSplitBoxSize < Magnitude(bbox.Size());
|
---|
708 |
|
---|
709 |
|
---|
710 | for (axis = 0; axis < 5; axis++)
|
---|
711 | if (
|
---|
712 | (axis < 3 && (leaf->depth < mDirSplitDepth || mInterleaveDirSplits)) ||
|
---|
713 | (axis >= 3 && (leaf->depth >= mDirSplitDepth))
|
---|
714 | ) {
|
---|
715 | if (!mSplitUseOnlyDrivingAxis || axis == sAxis || axis == dAxis) {
|
---|
716 |
|
---|
717 | if (splitType == ESplitRegular) {
|
---|
718 | if (axis < 3)
|
---|
719 | nPosition[axis] = (sBox.Min()[axis] + sBox.Max()[axis])*0.5f;
|
---|
720 | else
|
---|
721 | nPosition[axis] = (dBox.Min()[axis-3] + dBox.Max()[axis-3])*0.5f;
|
---|
722 |
|
---|
723 | nCostRatio[axis] = EvalCostRatio(leaf,
|
---|
724 | axis,
|
---|
725 | nPosition[axis],
|
---|
726 | nRaysBack[axis],
|
---|
727 | nRaysFront[axis],
|
---|
728 | nPvsBack[axis],
|
---|
729 | nPvsFront[axis]
|
---|
730 | );
|
---|
731 | } else
|
---|
732 | if (splitType == ESplitHeuristic) {
|
---|
733 | nCostRatio[axis] = EvalCostRatioHeuristic(
|
---|
734 | leaf,
|
---|
735 | axis,
|
---|
736 | nPosition[axis],
|
---|
737 | nRaysBack[axis],
|
---|
738 | nRaysFront[axis],
|
---|
739 | nPvsBack[axis],
|
---|
740 | nPvsFront[axis]);
|
---|
741 | } else
|
---|
742 | if (splitType == ESplitHybrid) {
|
---|
743 | if (leaf->depth > 7)
|
---|
744 | nCostRatio[axis] = EvalCostRatioHeuristic(
|
---|
745 | leaf,
|
---|
746 | axis,
|
---|
747 | nPosition[axis],
|
---|
748 | nRaysBack[axis],
|
---|
749 | nRaysFront[axis],
|
---|
750 | nPvsBack[axis],
|
---|
751 | nPvsFront[axis]);
|
---|
752 | else {
|
---|
753 | if (axis < 3)
|
---|
754 | nPosition[axis] = (sBox.Min()[axis] + sBox.Max()[axis])*0.5f;
|
---|
755 | else
|
---|
756 | nPosition[axis] = (dBox.Min()[axis-3] + dBox.Max()[axis-3])*0.5f;
|
---|
757 |
|
---|
758 | nCostRatio[axis] = EvalCostRatio(leaf,
|
---|
759 | axis,
|
---|
760 | nPosition[axis],
|
---|
761 | nRaysBack[axis],
|
---|
762 | nRaysFront[axis],
|
---|
763 | nPvsBack[axis],
|
---|
764 | nPvsFront[axis]
|
---|
765 | );
|
---|
766 | }
|
---|
767 | } else {
|
---|
768 | cerr<<"RssTree: Unknown split heuristics\n";
|
---|
769 | exit(1);
|
---|
770 | }
|
---|
771 |
|
---|
772 |
|
---|
773 | if ( bestAxis == -1)
|
---|
774 | bestAxis = axis;
|
---|
775 | else
|
---|
776 | if ( nCostRatio[axis] < nCostRatio[bestAxis] )
|
---|
777 | bestAxis = axis;
|
---|
778 | }
|
---|
779 | }
|
---|
780 |
|
---|
781 | axis = bestAxis;
|
---|
782 | position = nPosition[bestAxis];
|
---|
783 |
|
---|
784 | raysBack = nRaysBack[bestAxis];
|
---|
785 | raysFront = nRaysFront[bestAxis];
|
---|
786 |
|
---|
787 | pvsBack = nPvsBack[bestAxis];
|
---|
788 | pvsFront = nPvsFront[bestAxis];
|
---|
789 |
|
---|
790 | return nCostRatio[bestAxis];
|
---|
791 | }
|
---|
792 |
|
---|
793 |
|
---|
794 | float
|
---|
795 | RssTree::EvalCostRatioHeuristic(
|
---|
796 | RssTreeLeaf *leaf,
|
---|
797 | const int axis,
|
---|
798 | float &bestPosition,
|
---|
799 | int &raysBack,
|
---|
800 | int &raysFront,
|
---|
801 | int &pvsBack,
|
---|
802 | int &pvsFront
|
---|
803 | )
|
---|
804 | {
|
---|
805 | AxisAlignedBox3 box;
|
---|
806 | float minBox, maxBox;
|
---|
807 |
|
---|
808 | if (axis < 3) {
|
---|
809 | box = GetBBox(leaf);
|
---|
810 | minBox = box.Min(axis);
|
---|
811 | maxBox = box.Max(axis);
|
---|
812 | } else {
|
---|
813 | box = GetDirBBox(leaf);
|
---|
814 | minBox = box.Min(axis-3);
|
---|
815 | maxBox = box.Max(axis-3);
|
---|
816 | }
|
---|
817 |
|
---|
818 | SortSplitCandidates(leaf, axis);
|
---|
819 |
|
---|
820 | // go through the lists, count the number of objects left and right
|
---|
821 | // and evaluate the following cost funcion:
|
---|
822 | // C = ct_div_ci + (ql*rl + qr*rr)/queries
|
---|
823 |
|
---|
824 | int rl=0, rr = leaf->rays.size();
|
---|
825 | int pl=0, pr = leaf->GetPvsSize();
|
---|
826 | float sizeBox = maxBox - minBox;
|
---|
827 |
|
---|
828 | float minBand = minBox + 0.1*(maxBox - minBox);
|
---|
829 | float maxBand = minBox + 0.9*(maxBox - minBox);
|
---|
830 |
|
---|
831 | float minRatio = 1e20;
|
---|
832 |
|
---|
833 | Intersectable::NewMail();
|
---|
834 | // set all object as belonging to the fron pvs
|
---|
835 | for(RssTreeNode::RayInfoContainer::iterator ri = leaf->rays.begin();
|
---|
836 | ri != leaf->rays.end();
|
---|
837 | ri++)
|
---|
838 | if ((*ri).mRay->IsActive()) {
|
---|
839 | Intersectable *object = (*ri).mRay->mTerminationObject;
|
---|
840 | if (object)
|
---|
841 | if (!object->Mailed()) {
|
---|
842 | object->Mail();
|
---|
843 | object->mCounter = 1;
|
---|
844 | } else
|
---|
845 | object->mCounter++;
|
---|
846 | }
|
---|
847 |
|
---|
848 | Intersectable::NewMail();
|
---|
849 |
|
---|
850 | for(vector<SortableEntry>::const_iterator ci = splitCandidates->begin();
|
---|
851 | ci < splitCandidates->end();
|
---|
852 | ci++) {
|
---|
853 | VssRay *ray;
|
---|
854 | switch ((*ci).type) {
|
---|
855 | case SortableEntry::ERayMin: {
|
---|
856 | rr--;
|
---|
857 | rl++;
|
---|
858 | ray = (VssRay *) (*ci).data;
|
---|
859 | Intersectable *object = ray->mTerminationObject;
|
---|
860 | if (object) {
|
---|
861 | if (!object->Mailed()) {
|
---|
862 | object->Mail();
|
---|
863 | pl++;
|
---|
864 | }
|
---|
865 | if (--object->mCounter == 0)
|
---|
866 | pr--;
|
---|
867 | }
|
---|
868 | break;
|
---|
869 | }
|
---|
870 | }
|
---|
871 |
|
---|
872 | float position = (*ci).value;
|
---|
873 |
|
---|
874 | if (position > minBand && position < maxBand) {
|
---|
875 |
|
---|
876 | float ratio = GetCostRatio(
|
---|
877 | leaf,
|
---|
878 | axis,
|
---|
879 | position,
|
---|
880 | rl,
|
---|
881 | rr,
|
---|
882 | pl,
|
---|
883 | pr);
|
---|
884 |
|
---|
885 |
|
---|
886 | // cout<<"pos="<<(*ci).value<<"\t q=("<<ql<<","<<qr<<")\t r=("<<rl<<","<<rr<<")"<<endl;
|
---|
887 | // cout<<"cost= "<<sum<<endl;
|
---|
888 |
|
---|
889 | if (ratio < minRatio) {
|
---|
890 | minRatio = ratio;
|
---|
891 | bestPosition = position;
|
---|
892 |
|
---|
893 | raysBack = rl;
|
---|
894 | raysFront = rr;
|
---|
895 |
|
---|
896 | pvsBack = pl;
|
---|
897 | pvsFront = pr;
|
---|
898 |
|
---|
899 | }
|
---|
900 | }
|
---|
901 | }
|
---|
902 |
|
---|
903 |
|
---|
904 | // cout<<"===================="<<endl;
|
---|
905 | // cout<<"costRatio="<<ratio<<" pos="<<position<<" t="<<(position - minBox)/(maxBox - minBox)
|
---|
906 | // <<"\t q=("<<queriesBack<<","<<queriesFront<<")\t r=("<<raysBack<<","<<raysFront<<")"<<endl;
|
---|
907 | return minRatio;
|
---|
908 | }
|
---|
909 |
|
---|
910 | void
|
---|
911 | RssTree::SortSplitCandidates(
|
---|
912 | RssTreeLeaf *node,
|
---|
913 | const int axis
|
---|
914 | )
|
---|
915 | {
|
---|
916 |
|
---|
917 | splitCandidates->clear();
|
---|
918 |
|
---|
919 | int requestedSize = 2*(node->rays.size());
|
---|
920 | // creates a sorted split candidates array
|
---|
921 | if (splitCandidates->capacity() > 500000 &&
|
---|
922 | requestedSize < (int)(splitCandidates->capacity()/10) ) {
|
---|
923 |
|
---|
924 | delete splitCandidates;
|
---|
925 | splitCandidates = new vector<SortableEntry>;
|
---|
926 | }
|
---|
927 |
|
---|
928 | splitCandidates->reserve(requestedSize);
|
---|
929 |
|
---|
930 | // insert all queries
|
---|
931 | for(RssTreeNode::RayInfoContainer::const_iterator ri = node->rays.begin();
|
---|
932 | ri < node->rays.end();
|
---|
933 | ri++) {
|
---|
934 | if ((*ri).mRay->IsActive()) {
|
---|
935 | if (axis < 3) {
|
---|
936 | splitCandidates->push_back(SortableEntry(SortableEntry::ERayMin,
|
---|
937 | (*ri).ExtrapOrigin(axis),
|
---|
938 | (void *)(*ri).mRay)
|
---|
939 | );
|
---|
940 | } else {
|
---|
941 | float pos = (*ri).mRay->GetDirParametrization(axis-3);
|
---|
942 | splitCandidates->push_back(SortableEntry(SortableEntry::ERayMin,
|
---|
943 | pos,
|
---|
944 | (void *)(*ri).mRay)
|
---|
945 | );
|
---|
946 | }
|
---|
947 | }
|
---|
948 | }
|
---|
949 |
|
---|
950 | stable_sort(splitCandidates->begin(), splitCandidates->end());
|
---|
951 | }
|
---|
952 |
|
---|
953 |
|
---|
954 | void
|
---|
955 | RssTree::EvaluateLeafStats(const TraversalData &data)
|
---|
956 | {
|
---|
957 |
|
---|
958 | // the node became a leaf -> evaluate stats for leafs
|
---|
959 | RssTreeLeaf *leaf = (RssTreeLeaf *)data.node;
|
---|
960 |
|
---|
961 | if (data.depth >= termMaxDepth)
|
---|
962 | stat.maxDepthNodes++;
|
---|
963 |
|
---|
964 | // if ( (int)(leaf->rays.size()) < termMinCost)
|
---|
965 | // stat.minCostNodes++;
|
---|
966 | if ( leaf->GetPvsSize() < termMinPvs)
|
---|
967 | stat.minPvsNodes++;
|
---|
968 |
|
---|
969 | if ( leaf->GetPvsSize() < termMinRays)
|
---|
970 | stat.minRaysNodes++;
|
---|
971 |
|
---|
972 | if (leaf->GetAvgRayContribution() > termMaxRayContribution )
|
---|
973 | stat.maxRayContribNodes++;
|
---|
974 |
|
---|
975 | if (SqrMagnitude(data.bbox.Size()) <= termMinSize) {
|
---|
976 | stat.minSizeNodes++;
|
---|
977 | }
|
---|
978 |
|
---|
979 | if ( (int)(leaf->rays.size()) > stat.maxRayRefs)
|
---|
980 | stat.maxRayRefs = leaf->rays.size();
|
---|
981 |
|
---|
982 | }
|
---|
983 |
|
---|
984 | bool
|
---|
985 | RssTree::TerminationCriteriaSatisfied(RssTreeLeaf *leaf)
|
---|
986 | {
|
---|
987 | return ( (leaf->GetPvsSize() < termMinPvs) ||
|
---|
988 | (leaf->rays.size() < termMinRays) ||
|
---|
989 | // (leaf->GetAvgRayContribution() > termMaxRayContribution ) ||
|
---|
990 | (leaf->depth >= termMaxDepth) ||
|
---|
991 | (SqrMagnitude(GetBBox(leaf).Size()) <= termMinSize) ||
|
---|
992 | (mUseRss && leaf->mPassingRays == leaf->rays.size())
|
---|
993 | );
|
---|
994 | }
|
---|
995 |
|
---|
996 |
|
---|
997 | RssTreeNode *
|
---|
998 | RssTree::SubdivideNode(
|
---|
999 | RssTreeLeaf *leaf,
|
---|
1000 | const AxisAlignedBox3 &box,
|
---|
1001 | AxisAlignedBox3 &backBBox,
|
---|
1002 | AxisAlignedBox3 &frontBBox
|
---|
1003 | )
|
---|
1004 | {
|
---|
1005 |
|
---|
1006 | if (TerminationCriteriaSatisfied(leaf)) {
|
---|
1007 | #if 0
|
---|
1008 | if (leaf->depth >= termMaxDepth) {
|
---|
1009 | cout<<"Warning: max depth reached depth="<<(int)leaf->depth<<" rays="<<leaf->rays.size()<<endl;
|
---|
1010 | cout<<"Bbox: "<<GetBBox(leaf)<<" dirbbox:"<<GetDirBBox(leaf)<<endl;
|
---|
1011 | }
|
---|
1012 | #endif
|
---|
1013 |
|
---|
1014 | return leaf;
|
---|
1015 | }
|
---|
1016 |
|
---|
1017 | float position;
|
---|
1018 |
|
---|
1019 | // first count ray sides
|
---|
1020 | int raysBack;
|
---|
1021 | int raysFront;
|
---|
1022 | int pvsBack;
|
---|
1023 | int pvsFront;
|
---|
1024 |
|
---|
1025 | // select subdivision axis
|
---|
1026 | int axis = SelectPlane( leaf, box, position, raysBack, raysFront, pvsBack, pvsFront);
|
---|
1027 | Debug<<"axis="<<axis<<" depth="<<(int)leaf->depth<<" rb="<<raysBack<<" rf="<<raysFront<<" pvsb="<<pvsBack<<" pvsf="<<pvsFront<<endl;
|
---|
1028 |
|
---|
1029 | if (axis == -1) {
|
---|
1030 | return leaf;
|
---|
1031 | }
|
---|
1032 |
|
---|
1033 | stat.nodes+=2;
|
---|
1034 | stat.splits[axis]++;
|
---|
1035 |
|
---|
1036 | // add the new nodes to the tree
|
---|
1037 | RssTreeInterior *node = new RssTreeInterior(leaf->parent);
|
---|
1038 |
|
---|
1039 | node->axis = axis;
|
---|
1040 | node->position = position;
|
---|
1041 | node->bbox = box;
|
---|
1042 | node->dirBBox = GetDirBBox(leaf);
|
---|
1043 |
|
---|
1044 | backBBox = box;
|
---|
1045 | frontBBox = box;
|
---|
1046 |
|
---|
1047 | RssTreeLeaf *back = new RssTreeLeaf(node, raysBack);
|
---|
1048 | RssTreeLeaf *front = new RssTreeLeaf(node, raysFront);
|
---|
1049 |
|
---|
1050 | // replace a link from node's parent
|
---|
1051 | if ( leaf->parent )
|
---|
1052 | leaf->parent->ReplaceChildLink(leaf, node);
|
---|
1053 | // and setup child links
|
---|
1054 | node->SetupChildLinks(back, front);
|
---|
1055 |
|
---|
1056 | if (axis <= RssTreeNode::SPLIT_Z) {
|
---|
1057 | backBBox.SetMax(axis, position);
|
---|
1058 | frontBBox.SetMin(axis, position);
|
---|
1059 |
|
---|
1060 | for(RssTreeNode::RayInfoContainer::iterator ri = leaf->rays.begin();
|
---|
1061 | ri != leaf->rays.end();
|
---|
1062 | ri++) {
|
---|
1063 | if ((*ri).mRay->IsActive()) {
|
---|
1064 |
|
---|
1065 | // first unref ray from the former leaf
|
---|
1066 | (*ri).mRay->Unref();
|
---|
1067 |
|
---|
1068 | // Debug << "computed t: " << (*ri).mRay->mT << endl;
|
---|
1069 | // determine the side of this ray with respect to the plane
|
---|
1070 | int side = node->ComputeRaySide(*ri);
|
---|
1071 |
|
---|
1072 | if (side == 0) {
|
---|
1073 | if ((*ri).mRay->HasPosDir(axis)) {
|
---|
1074 | back->AddRay(*ri);
|
---|
1075 | front->AddRay(*ri);
|
---|
1076 | } else {
|
---|
1077 | back->AddRay(*ri);
|
---|
1078 | front->AddRay(*ri);
|
---|
1079 | }
|
---|
1080 | } else
|
---|
1081 | if (side == 1)
|
---|
1082 | front->AddRay(*ri);
|
---|
1083 | else
|
---|
1084 | back->AddRay(*ri);
|
---|
1085 | } else
|
---|
1086 | (*ri).mRay->Unref();
|
---|
1087 | }
|
---|
1088 | } else {
|
---|
1089 | // rays front/back
|
---|
1090 |
|
---|
1091 |
|
---|
1092 | for(RssTreeNode::RayInfoContainer::iterator ri = leaf->rays.begin();
|
---|
1093 | ri != leaf->rays.end();
|
---|
1094 | ri++) {
|
---|
1095 | if ((*ri).mRay->IsActive()) {
|
---|
1096 | // first unref ray from the former leaf
|
---|
1097 | (*ri).mRay->Unref();
|
---|
1098 |
|
---|
1099 | int side;
|
---|
1100 | if ((*ri).mRay->GetDirParametrization(axis - 3) <= position)
|
---|
1101 | side = -1;
|
---|
1102 | else
|
---|
1103 | side = 1;
|
---|
1104 |
|
---|
1105 | if (side == 1)
|
---|
1106 | front->AddRay(*ri);
|
---|
1107 | else
|
---|
1108 | back->AddRay(*ri);
|
---|
1109 |
|
---|
1110 | } else
|
---|
1111 | (*ri).mRay->Unref();
|
---|
1112 | }
|
---|
1113 | }
|
---|
1114 |
|
---|
1115 | #if 0
|
---|
1116 | front->SetPvsSize(pvsFront);
|
---|
1117 | back->SetPvsSize(pvsBack);
|
---|
1118 | // compute entropy as well
|
---|
1119 | front->ComputeEntropyImportance();
|
---|
1120 | back->ComputeEntropyImportance();
|
---|
1121 | #else
|
---|
1122 | front->UpdatePvsSize();
|
---|
1123 | back->UpdatePvsSize();
|
---|
1124 | #endif
|
---|
1125 |
|
---|
1126 |
|
---|
1127 | // update stats
|
---|
1128 | stat.rayRefs -= leaf->rays.size();
|
---|
1129 | stat.rayRefs += raysBack + raysFront;
|
---|
1130 |
|
---|
1131 |
|
---|
1132 | delete leaf;
|
---|
1133 | return node;
|
---|
1134 | }
|
---|
1135 |
|
---|
1136 |
|
---|
1137 |
|
---|
1138 |
|
---|
1139 |
|
---|
1140 |
|
---|
1141 | int
|
---|
1142 | RssTree::ReleaseMemory(const int time)
|
---|
1143 | {
|
---|
1144 | stack<RssTreeNode *> tstack;
|
---|
1145 |
|
---|
1146 | // find a node in the tree which subtree will be collapsed
|
---|
1147 | int maxAccessTime = time - accessTimeThreshold;
|
---|
1148 | int released;
|
---|
1149 |
|
---|
1150 | tstack.push(root);
|
---|
1151 |
|
---|
1152 | while (!tstack.empty()) {
|
---|
1153 | RssTreeNode *node = tstack.top();
|
---|
1154 | tstack.pop();
|
---|
1155 |
|
---|
1156 |
|
---|
1157 | if (!node->IsLeaf()) {
|
---|
1158 | RssTreeInterior *in = (RssTreeInterior *)node;
|
---|
1159 | // cout<<"depth="<<(int)in->depth<<" time="<<in->lastAccessTime<<endl;
|
---|
1160 | if (in->depth >= minCollapseDepth &&
|
---|
1161 | in->lastAccessTime <= maxAccessTime) {
|
---|
1162 | released = CollapseSubtree(node, time);
|
---|
1163 | break;
|
---|
1164 | }
|
---|
1165 |
|
---|
1166 | if (in->back->GetAccessTime() <
|
---|
1167 | in->front->GetAccessTime()) {
|
---|
1168 | tstack.push(in->front);
|
---|
1169 | tstack.push(in->back);
|
---|
1170 | } else {
|
---|
1171 | tstack.push(in->back);
|
---|
1172 | tstack.push(in->front);
|
---|
1173 | }
|
---|
1174 | }
|
---|
1175 | }
|
---|
1176 |
|
---|
1177 | while (tstack.empty()) {
|
---|
1178 | // could find node to collaps...
|
---|
1179 | // cout<<"Could not find a node to release "<<endl;
|
---|
1180 | break;
|
---|
1181 | }
|
---|
1182 |
|
---|
1183 | return released;
|
---|
1184 | }
|
---|
1185 |
|
---|
1186 |
|
---|
1187 |
|
---|
1188 |
|
---|
1189 | RssTreeNode *
|
---|
1190 | RssTree::SubdivideLeaf(
|
---|
1191 | RssTreeLeaf *leaf
|
---|
1192 | )
|
---|
1193 | {
|
---|
1194 | RssTreeNode *node = leaf;
|
---|
1195 |
|
---|
1196 | AxisAlignedBox3 leafBBox = GetBBox(leaf);
|
---|
1197 |
|
---|
1198 | static int pass = 0;
|
---|
1199 | pass ++;
|
---|
1200 |
|
---|
1201 | // check if we should perform a dynamic subdivision of the leaf
|
---|
1202 | if (!TerminationCriteriaSatisfied(leaf)) {
|
---|
1203 |
|
---|
1204 | // memory check and realese...
|
---|
1205 | if (GetMemUsage() > maxTotalMemory) {
|
---|
1206 | ReleaseMemory( pass );
|
---|
1207 | }
|
---|
1208 |
|
---|
1209 | AxisAlignedBox3 backBBox, frontBBox;
|
---|
1210 |
|
---|
1211 | // subdivide the node
|
---|
1212 | node =
|
---|
1213 | SubdivideNode(leaf,
|
---|
1214 | leafBBox,
|
---|
1215 | backBBox,
|
---|
1216 | frontBBox
|
---|
1217 | );
|
---|
1218 | }
|
---|
1219 |
|
---|
1220 | return node;
|
---|
1221 | }
|
---|
1222 |
|
---|
1223 |
|
---|
1224 |
|
---|
1225 | void
|
---|
1226 | RssTree::UpdateRays(VssRayContainer &remove,
|
---|
1227 | VssRayContainer &add
|
---|
1228 | )
|
---|
1229 | {
|
---|
1230 | RssTreeLeaf::NewMail();
|
---|
1231 |
|
---|
1232 | // schedule rays for removal
|
---|
1233 | for(VssRayContainer::const_iterator ri = remove.begin();
|
---|
1234 | ri != remove.end();
|
---|
1235 | ri++) {
|
---|
1236 | (*ri)->ScheduleForRemoval();
|
---|
1237 | }
|
---|
1238 |
|
---|
1239 | int inactive=0;
|
---|
1240 |
|
---|
1241 | for(VssRayContainer::const_iterator ri = remove.begin();
|
---|
1242 | ri != remove.end();
|
---|
1243 | ri++) {
|
---|
1244 | if ((*ri)->ScheduledForRemoval())
|
---|
1245 | // RemoveRay(*ri, NULL, false);
|
---|
1246 | // !!! BUG - with true it does not work correctly - aggreated delete
|
---|
1247 | RemoveRay(*ri, NULL, true);
|
---|
1248 | else
|
---|
1249 | inactive++;
|
---|
1250 | }
|
---|
1251 |
|
---|
1252 |
|
---|
1253 | // cout<<"all/inactive"<<remove.size()<<"/"<<inactive<<endl;
|
---|
1254 |
|
---|
1255 | for(VssRayContainer::const_iterator ri = add.begin();
|
---|
1256 | ri != add.end();
|
---|
1257 | ri++) {
|
---|
1258 | RssTreeNode::RayInfo info(*ri);
|
---|
1259 | if (ClipRay(info, bbox))
|
---|
1260 | AddRay(info);
|
---|
1261 | }
|
---|
1262 | }
|
---|
1263 |
|
---|
1264 |
|
---|
1265 | void
|
---|
1266 | RssTree::RemoveRay(VssRay *ray,
|
---|
1267 | vector<RssTreeLeaf *> *affectedLeaves,
|
---|
1268 | const bool removeAllScheduledRays
|
---|
1269 | )
|
---|
1270 | {
|
---|
1271 |
|
---|
1272 | stack<RayTraversalData> tstack;
|
---|
1273 |
|
---|
1274 | tstack.push(RayTraversalData(root, RssTreeNode::RayInfo(ray)));
|
---|
1275 |
|
---|
1276 | RayTraversalData data;
|
---|
1277 |
|
---|
1278 | // cout<<"Number of ray refs = "<<ray->RefCount()<<endl;
|
---|
1279 |
|
---|
1280 | while (!tstack.empty()) {
|
---|
1281 | data = tstack.top();
|
---|
1282 | tstack.pop();
|
---|
1283 |
|
---|
1284 | if (!data.node->IsLeaf()) {
|
---|
1285 | // split the set of rays in two groups intersecting the
|
---|
1286 | // two subtrees
|
---|
1287 |
|
---|
1288 | TraverseInternalNode(data, tstack);
|
---|
1289 |
|
---|
1290 | } else {
|
---|
1291 | // remove the ray from the leaf
|
---|
1292 | // find the ray in the leaf and swap it with the last ray...
|
---|
1293 | RssTreeLeaf *leaf = (RssTreeLeaf *)data.node;
|
---|
1294 |
|
---|
1295 | if (!leaf->Mailed()) {
|
---|
1296 | leaf->Mail();
|
---|
1297 | if (affectedLeaves)
|
---|
1298 | affectedLeaves->push_back(leaf);
|
---|
1299 |
|
---|
1300 | if (removeAllScheduledRays) {
|
---|
1301 | int tail = leaf->rays.size()-1;
|
---|
1302 |
|
---|
1303 | for (int i=0; i < (int)(leaf->rays.size()); i++) {
|
---|
1304 | if (leaf->rays[i].mRay->ScheduledForRemoval()) {
|
---|
1305 | // find a ray to replace it with
|
---|
1306 | while (tail >= i && leaf->rays[tail].mRay->ScheduledForRemoval()) {
|
---|
1307 | stat.removedRayRefs++;
|
---|
1308 | leaf->rays[tail].mRay->Unref();
|
---|
1309 | leaf->rays.pop_back();
|
---|
1310 | tail--;
|
---|
1311 | }
|
---|
1312 |
|
---|
1313 | if (tail < i)
|
---|
1314 | break;
|
---|
1315 |
|
---|
1316 | stat.removedRayRefs++;
|
---|
1317 | leaf->rays[i].mRay->Unref();
|
---|
1318 | leaf->rays[i] = leaf->rays[tail];
|
---|
1319 | leaf->rays.pop_back();
|
---|
1320 | tail--;
|
---|
1321 | }
|
---|
1322 | }
|
---|
1323 | }
|
---|
1324 | }
|
---|
1325 |
|
---|
1326 | if (!removeAllScheduledRays)
|
---|
1327 | for (int i=0; i < (int)leaf->rays.size(); i++) {
|
---|
1328 | if (leaf->rays[i].mRay == ray) {
|
---|
1329 | stat.removedRayRefs++;
|
---|
1330 | ray->Unref();
|
---|
1331 | leaf->rays[i] = leaf->rays[leaf->rays.size()-1];
|
---|
1332 | leaf->rays.pop_back();
|
---|
1333 | // check this ray again
|
---|
1334 | break;
|
---|
1335 | }
|
---|
1336 | }
|
---|
1337 |
|
---|
1338 | }
|
---|
1339 | }
|
---|
1340 |
|
---|
1341 | if (ray->RefCount() != 0) {
|
---|
1342 | cerr<<"Error: Number of remaining refs = "<<ray->RefCount()<<endl;
|
---|
1343 | exit(1);
|
---|
1344 | }
|
---|
1345 |
|
---|
1346 | }
|
---|
1347 |
|
---|
1348 |
|
---|
1349 | void
|
---|
1350 | RssTree::AddRay(RssTreeNode::RayInfo &info)
|
---|
1351 | {
|
---|
1352 |
|
---|
1353 | stack<RayTraversalData> tstack;
|
---|
1354 |
|
---|
1355 | tstack.push(RayTraversalData(root, info));
|
---|
1356 |
|
---|
1357 | RayTraversalData data;
|
---|
1358 |
|
---|
1359 | while (!tstack.empty()) {
|
---|
1360 | data = tstack.top();
|
---|
1361 | tstack.pop();
|
---|
1362 |
|
---|
1363 | if (!data.node->IsLeaf()) {
|
---|
1364 | TraverseInternalNode(data, tstack);
|
---|
1365 | } else {
|
---|
1366 | // remove the ray from the leaf
|
---|
1367 | // find the ray in the leaf and swap it with the last ray...
|
---|
1368 | RssTreeLeaf *leaf = (RssTreeLeaf *)data.node;
|
---|
1369 | leaf->AddRay(data.rayData);
|
---|
1370 | stat.addedRayRefs++;
|
---|
1371 | }
|
---|
1372 | }
|
---|
1373 | }
|
---|
1374 |
|
---|
1375 | void
|
---|
1376 | RssTree::TraverseInternalNode(
|
---|
1377 | RayTraversalData &data,
|
---|
1378 | stack<RayTraversalData> &tstack)
|
---|
1379 | {
|
---|
1380 | RssTreeInterior *in = (RssTreeInterior *) data.node;
|
---|
1381 |
|
---|
1382 | if (in->axis <= RssTreeNode::SPLIT_Z) {
|
---|
1383 |
|
---|
1384 | // determine the side of this ray with respect to the plane
|
---|
1385 | int side = in->ComputeRaySide(data.rayData
|
---|
1386 | );
|
---|
1387 |
|
---|
1388 |
|
---|
1389 | if (side == 0) {
|
---|
1390 | if (data.rayData.mRay->HasPosDir(in->axis)) {
|
---|
1391 | tstack.push(RayTraversalData(in->back,
|
---|
1392 | data.rayData)
|
---|
1393 | );
|
---|
1394 |
|
---|
1395 | tstack.push(RayTraversalData(in->front,
|
---|
1396 | data.rayData)
|
---|
1397 | );
|
---|
1398 |
|
---|
1399 | } else {
|
---|
1400 | tstack.push(RayTraversalData(in->back,
|
---|
1401 | data.rayData
|
---|
1402 | )
|
---|
1403 | );
|
---|
1404 |
|
---|
1405 | tstack.push(RayTraversalData(in->front,
|
---|
1406 | data.rayData)
|
---|
1407 | );
|
---|
1408 |
|
---|
1409 |
|
---|
1410 | }
|
---|
1411 | } else
|
---|
1412 | if (side == 1)
|
---|
1413 | tstack.push(RayTraversalData(in->front, data.rayData));
|
---|
1414 | else
|
---|
1415 | tstack.push(RayTraversalData(in->back, data.rayData));
|
---|
1416 | }
|
---|
1417 | else {
|
---|
1418 | // directional split
|
---|
1419 | if (data.rayData.mRay->GetDirParametrization(in->axis - 3) <= in->position)
|
---|
1420 | tstack.push(RayTraversalData(in->back, data.rayData));
|
---|
1421 | else
|
---|
1422 | tstack.push(RayTraversalData(in->front, data.rayData));
|
---|
1423 | }
|
---|
1424 | }
|
---|
1425 |
|
---|
1426 |
|
---|
1427 | int
|
---|
1428 | RssTree::CollapseSubtree(RssTreeNode *sroot, const int time)
|
---|
1429 | {
|
---|
1430 | // first count all rays in the subtree
|
---|
1431 | // use mail 1 for this purpose
|
---|
1432 | stack<RssTreeNode *> tstack;
|
---|
1433 | int rayCount = 0;
|
---|
1434 | int totalRayCount = 0;
|
---|
1435 | int collapsedNodes = 0;
|
---|
1436 |
|
---|
1437 | #if DEBUG_COLLAPSE
|
---|
1438 | cout<<"Collapsing subtree"<<endl;
|
---|
1439 | cout<<"acessTime="<<sroot->GetAccessTime()<<endl;
|
---|
1440 | cout<<"depth="<<(int)sroot->depth<<endl;
|
---|
1441 | #endif
|
---|
1442 |
|
---|
1443 | // tstat.collapsedSubtrees++;
|
---|
1444 | // tstat.collapseDepths += (int)sroot->depth;
|
---|
1445 | // tstat.collapseAccessTimes += time - sroot->GetAccessTime();
|
---|
1446 |
|
---|
1447 | tstack.push(sroot);
|
---|
1448 | VssRay::NewMail();
|
---|
1449 |
|
---|
1450 | while (!tstack.empty()) {
|
---|
1451 | collapsedNodes++;
|
---|
1452 | RssTreeNode *node = tstack.top();
|
---|
1453 | tstack.pop();
|
---|
1454 |
|
---|
1455 | if (node->IsLeaf()) {
|
---|
1456 | RssTreeLeaf *leaf = (RssTreeLeaf *) node;
|
---|
1457 | for(RssTreeNode::RayInfoContainer::iterator ri = leaf->rays.begin();
|
---|
1458 | ri != leaf->rays.end();
|
---|
1459 | ri++) {
|
---|
1460 |
|
---|
1461 | totalRayCount++;
|
---|
1462 | if ((*ri).mRay->IsActive() && !(*ri).mRay->Mailed()) {
|
---|
1463 | (*ri).mRay->Mail();
|
---|
1464 | rayCount++;
|
---|
1465 | }
|
---|
1466 | }
|
---|
1467 | } else {
|
---|
1468 | tstack.push(((RssTreeInterior *)node)->back);
|
---|
1469 | tstack.push(((RssTreeInterior *)node)->front);
|
---|
1470 | }
|
---|
1471 | }
|
---|
1472 |
|
---|
1473 | VssRay::NewMail();
|
---|
1474 |
|
---|
1475 | // create a new node that will hold the rays
|
---|
1476 | RssTreeLeaf *newLeaf = new RssTreeLeaf( sroot->parent, rayCount );
|
---|
1477 | if ( newLeaf->parent )
|
---|
1478 | newLeaf->parent->ReplaceChildLink(sroot, newLeaf);
|
---|
1479 |
|
---|
1480 |
|
---|
1481 | tstack.push( sroot );
|
---|
1482 |
|
---|
1483 | while (!tstack.empty()) {
|
---|
1484 |
|
---|
1485 | RssTreeNode *node = tstack.top();
|
---|
1486 | tstack.pop();
|
---|
1487 |
|
---|
1488 | if (node->IsLeaf()) {
|
---|
1489 | RssTreeLeaf *leaf = (RssTreeLeaf *) node;
|
---|
1490 |
|
---|
1491 | for(RssTreeNode::RayInfoContainer::iterator ri = leaf->rays.begin();
|
---|
1492 | ri != leaf->rays.end();
|
---|
1493 | ri++) {
|
---|
1494 |
|
---|
1495 | // unref this ray from the old node
|
---|
1496 |
|
---|
1497 | if ((*ri).mRay->IsActive()) {
|
---|
1498 | (*ri).mRay->Unref();
|
---|
1499 | if (!(*ri).mRay->Mailed()) {
|
---|
1500 | (*ri).mRay->Mail();
|
---|
1501 | newLeaf->AddRay(*ri);
|
---|
1502 | }
|
---|
1503 | } else
|
---|
1504 | (*ri).mRay->Unref();
|
---|
1505 |
|
---|
1506 | }
|
---|
1507 | } else {
|
---|
1508 | tstack.push(((RssTreeInterior *)node)->back);
|
---|
1509 | tstack.push(((RssTreeInterior *)node)->front);
|
---|
1510 | }
|
---|
1511 | }
|
---|
1512 |
|
---|
1513 | // delete the node and all its children
|
---|
1514 | delete sroot;
|
---|
1515 |
|
---|
1516 | // for(RssTreeNode::SRayContainer::iterator ri = newLeaf->rays.begin();
|
---|
1517 | // ri != newLeaf->rays.end();
|
---|
1518 | // ri++)
|
---|
1519 | // (*ri).ray->UnMail(2);
|
---|
1520 |
|
---|
1521 |
|
---|
1522 | #if DEBUG_COLLAPSE
|
---|
1523 | cout<<"Total memory before="<<GetMemUsage()<<endl;
|
---|
1524 | #endif
|
---|
1525 |
|
---|
1526 | stat.nodes -= collapsedNodes - 1;
|
---|
1527 | stat.rayRefs -= totalRayCount - rayCount;
|
---|
1528 |
|
---|
1529 | #if DEBUG_COLLAPSE
|
---|
1530 | cout<<"collapsed nodes"<<collapsedNodes<<endl;
|
---|
1531 | cout<<"collapsed rays"<<totalRayCount - rayCount<<endl;
|
---|
1532 | cout<<"Total memory after="<<GetMemUsage()<<endl;
|
---|
1533 | cout<<"================================"<<endl;
|
---|
1534 | #endif
|
---|
1535 |
|
---|
1536 | // tstat.collapsedNodes += collapsedNodes;
|
---|
1537 | // tstat.collapsedRays += totalRayCount - rayCount;
|
---|
1538 |
|
---|
1539 | return totalRayCount - rayCount;
|
---|
1540 | }
|
---|
1541 |
|
---|
1542 |
|
---|
1543 | int
|
---|
1544 | RssTree::GetPvsSize(const AxisAlignedBox3 &box) const
|
---|
1545 | {
|
---|
1546 | stack<RssTreeNode *> tstack;
|
---|
1547 | tstack.push(root);
|
---|
1548 |
|
---|
1549 | Intersectable::NewMail();
|
---|
1550 | int pvsSize = 0;
|
---|
1551 |
|
---|
1552 | while (!tstack.empty()) {
|
---|
1553 | RssTreeNode *node = tstack.top();
|
---|
1554 | tstack.pop();
|
---|
1555 |
|
---|
1556 |
|
---|
1557 | if (node->IsLeaf()) {
|
---|
1558 | RssTreeLeaf *leaf = (RssTreeLeaf *)node;
|
---|
1559 | for(RssTreeNode::RayInfoContainer::iterator ri = leaf->rays.begin();
|
---|
1560 | ri != leaf->rays.end();
|
---|
1561 | ri++)
|
---|
1562 | if ((*ri).mRay->IsActive()) {
|
---|
1563 | Intersectable *object;
|
---|
1564 | #if BIDIRECTIONAL_RAY
|
---|
1565 | object = (*ri).mRay->mOriginObject;
|
---|
1566 | if (object && !object->Mailed()) {
|
---|
1567 | pvsSize++;
|
---|
1568 | object->Mail();
|
---|
1569 | }
|
---|
1570 | #endif
|
---|
1571 | object = (*ri).mRay->mTerminationObject;
|
---|
1572 | if (object && !object->Mailed()) {
|
---|
1573 | pvsSize++;
|
---|
1574 | object->Mail();
|
---|
1575 | }
|
---|
1576 | }
|
---|
1577 | } else {
|
---|
1578 | RssTreeInterior *in = (RssTreeInterior *)node;
|
---|
1579 | if (in->axis < 3) {
|
---|
1580 | if (box.Max(in->axis) >= in->position )
|
---|
1581 | tstack.push(in->front);
|
---|
1582 |
|
---|
1583 | if (box.Min(in->axis) <= in->position )
|
---|
1584 | tstack.push(in->back);
|
---|
1585 | } else {
|
---|
1586 | // both nodes for directional splits
|
---|
1587 | tstack.push(in->front);
|
---|
1588 | tstack.push(in->back);
|
---|
1589 | }
|
---|
1590 | }
|
---|
1591 | }
|
---|
1592 | return pvsSize;
|
---|
1593 | }
|
---|
1594 |
|
---|
1595 | int
|
---|
1596 | RssTree::CollectPvs(const AxisAlignedBox3 &box,
|
---|
1597 | ObjectContainer &pvs
|
---|
1598 | ) const
|
---|
1599 | {
|
---|
1600 | stack<RssTreeNode *> tstack;
|
---|
1601 | tstack.push(root);
|
---|
1602 |
|
---|
1603 | Intersectable::NewMail();
|
---|
1604 |
|
---|
1605 | while (!tstack.empty()) {
|
---|
1606 | RssTreeNode *node = tstack.top();
|
---|
1607 | tstack.pop();
|
---|
1608 |
|
---|
1609 |
|
---|
1610 | if (node->IsLeaf()) {
|
---|
1611 | RssTreeLeaf *leaf = (RssTreeLeaf *)node;
|
---|
1612 | for(RssTreeNode::RayInfoContainer::iterator ri = leaf->rays.begin();
|
---|
1613 | ri != leaf->rays.end();
|
---|
1614 | ri++)
|
---|
1615 | if ((*ri).mRay->IsActive()) {
|
---|
1616 | Intersectable *object;
|
---|
1617 | object = (*ri).mRay->mTerminationObject;
|
---|
1618 | if (object && !object->Mailed()) {
|
---|
1619 | pvs.push_back(object);
|
---|
1620 | object->Mail();
|
---|
1621 | }
|
---|
1622 | }
|
---|
1623 | } else {
|
---|
1624 | RssTreeInterior *in = (RssTreeInterior *)node;
|
---|
1625 | if (in->axis < 3) {
|
---|
1626 | if (box.Max(in->axis) >= in->position )
|
---|
1627 | tstack.push(in->front);
|
---|
1628 |
|
---|
1629 | if (box.Min(in->axis) <= in->position )
|
---|
1630 | tstack.push(in->back);
|
---|
1631 | } else {
|
---|
1632 | // both nodes for directional splits
|
---|
1633 | tstack.push(in->front);
|
---|
1634 | tstack.push(in->back);
|
---|
1635 | }
|
---|
1636 | }
|
---|
1637 | }
|
---|
1638 | return pvs.size();
|
---|
1639 | }
|
---|
1640 |
|
---|
1641 | void
|
---|
1642 | RssTree::GetTreeStatistics(
|
---|
1643 | float &avgPvsSize,
|
---|
1644 | float &avgRayContribution,
|
---|
1645 | float &avgPvsEntropy,
|
---|
1646 | float &avgRayLengthEntropy,
|
---|
1647 | float &avgImportance
|
---|
1648 | )
|
---|
1649 | {
|
---|
1650 | stack<RssTreeNode *> tstack;
|
---|
1651 | tstack.push(root);
|
---|
1652 |
|
---|
1653 | float sumPvsSize = 0.0f;
|
---|
1654 | float sumRayContribution = 0.0f;
|
---|
1655 | float sumImportance = 0.0f;
|
---|
1656 | float sumPvsEntropy = 0.0f;
|
---|
1657 | float sumRayLengthEntropy = 0.0f;
|
---|
1658 |
|
---|
1659 | int leaves = 0;
|
---|
1660 |
|
---|
1661 | while (!tstack.empty()) {
|
---|
1662 | RssTreeNode *node = tstack.top();
|
---|
1663 | tstack.pop();
|
---|
1664 |
|
---|
1665 | if (node->IsLeaf()) {
|
---|
1666 | leaves++;
|
---|
1667 | RssTreeLeaf *leaf = (RssTreeLeaf *)node;
|
---|
1668 |
|
---|
1669 | sumPvsSize += leaf->GetPvsSize();
|
---|
1670 | sumRayContribution += leaf->GetAvgRayContribution();
|
---|
1671 | sumPvsEntropy += leaf->mPvsEntropy;
|
---|
1672 | sumRayLengthEntropy += leaf->mRayLengthEntropy;
|
---|
1673 |
|
---|
1674 | float imp = leaf->GetImportance();
|
---|
1675 |
|
---|
1676 | if (imp > 1.0f)
|
---|
1677 | cout<<"warning imp > 1.0f:"<<imp<<endl;
|
---|
1678 |
|
---|
1679 | sumImportance += imp;
|
---|
1680 |
|
---|
1681 |
|
---|
1682 | } else {
|
---|
1683 | RssTreeInterior *in = (RssTreeInterior *)node;
|
---|
1684 | // both nodes for directional splits
|
---|
1685 | tstack.push(in->front);
|
---|
1686 | tstack.push(in->back);
|
---|
1687 | }
|
---|
1688 | }
|
---|
1689 |
|
---|
1690 | avgPvsSize = sumPvsSize/(float)leaves;
|
---|
1691 | avgRayContribution = sumRayContribution/(float)leaves;
|
---|
1692 | avgPvsEntropy = sumPvsEntropy/(float)leaves;
|
---|
1693 | avgRayLengthEntropy = sumRayLengthEntropy/(float)leaves;
|
---|
1694 | avgImportance = sumImportance/(float)leaves;
|
---|
1695 | }
|
---|
1696 |
|
---|
1697 |
|
---|
1698 | int
|
---|
1699 | RssTree::GenerateRays(const float ratioPerLeaf,
|
---|
1700 | SimpleRayContainer &rays)
|
---|
1701 | {
|
---|
1702 | stack<RssTreeNode *> tstack;
|
---|
1703 | tstack.push(root);
|
---|
1704 |
|
---|
1705 | while (!tstack.empty()) {
|
---|
1706 | RssTreeNode *node = tstack.top();
|
---|
1707 | tstack.pop();
|
---|
1708 |
|
---|
1709 | if (node->IsLeaf()) {
|
---|
1710 | RssTreeLeaf *leaf = (RssTreeLeaf *)node;
|
---|
1711 | float c = leaf->GetImportance();
|
---|
1712 | int num = (c*ratioPerLeaf + 0.5);
|
---|
1713 | // cout<<num<<" ";
|
---|
1714 |
|
---|
1715 | for (int i=0; i < num; i++) {
|
---|
1716 | Vector3 origin = GetBBox(leaf).GetRandomPoint();
|
---|
1717 | Vector3 dirVector = GetDirBBox(leaf).GetRandomPoint();
|
---|
1718 | Vector3 direction = VssRay::GetDirection(dirVector.x, dirVector.y);
|
---|
1719 | //cout<<"dir vector.x="<<dirVector.x<<"direction'.x="<<atan2(direction.x, direction.y)<<endl;
|
---|
1720 | rays.push_back(SimpleRay(origin, direction));
|
---|
1721 | }
|
---|
1722 |
|
---|
1723 | } else {
|
---|
1724 | RssTreeInterior *in = (RssTreeInterior *)node;
|
---|
1725 | // both nodes for directional splits
|
---|
1726 | tstack.push(in->front);
|
---|
1727 | tstack.push(in->back);
|
---|
1728 | }
|
---|
1729 | }
|
---|
1730 |
|
---|
1731 | return rays.size();
|
---|
1732 | }
|
---|
1733 |
|
---|
1734 | void
|
---|
1735 | RssTree::CollectLeaves(vector<RssTreeLeaf *> &leaves)
|
---|
1736 | {
|
---|
1737 | stack<RssTreeNode *> tstack;
|
---|
1738 | tstack.push(root);
|
---|
1739 |
|
---|
1740 | while (!tstack.empty()) {
|
---|
1741 | RssTreeNode *node = tstack.top();
|
---|
1742 | tstack.pop();
|
---|
1743 |
|
---|
1744 | if (node->IsLeaf()) {
|
---|
1745 | RssTreeLeaf *leaf = (RssTreeLeaf *)node;
|
---|
1746 | leaves.push_back(leaf);
|
---|
1747 | } else {
|
---|
1748 | RssTreeInterior *in = (RssTreeInterior *)node;
|
---|
1749 | // both nodes for directional splits
|
---|
1750 | tstack.push(in->front);
|
---|
1751 | tstack.push(in->back);
|
---|
1752 | }
|
---|
1753 | }
|
---|
1754 | }
|
---|
1755 |
|
---|
1756 | bool
|
---|
1757 | RssTree::ValidLeaf(RssTreeLeaf *leaf) const
|
---|
1758 | {
|
---|
1759 | return leaf->rays.size() > termMinRays/4;
|
---|
1760 | }
|
---|
1761 |
|
---|
1762 |
|
---|
1763 | void
|
---|
1764 | RssTree::GenerateLeafRays(RssTreeLeaf *leaf,
|
---|
1765 | const int numberOfRays,
|
---|
1766 | SimpleRayContainer &rays)
|
---|
1767 | {
|
---|
1768 | int nrays = leaf->rays.size();
|
---|
1769 | for (int i=0; i < numberOfRays; i++) {
|
---|
1770 | // pickup 3 random rays
|
---|
1771 | int r1 = Random(nrays-1);
|
---|
1772 | int r2 = Random(nrays-1);
|
---|
1773 | int r3 = Random(nrays-1);
|
---|
1774 |
|
---|
1775 | Vector3 o1 = leaf->rays[r1].GetOrigin();
|
---|
1776 |
|
---|
1777 | Vector3 o2 = leaf->rays[r2].GetOrigin();
|
---|
1778 |
|
---|
1779 | Vector3 o3 = leaf->rays[r3].GetOrigin();
|
---|
1780 |
|
---|
1781 | const float overlap = 0.1;
|
---|
1782 |
|
---|
1783 | Vector3 origin, direction;
|
---|
1784 | // generate half of convex combination and half of random rays
|
---|
1785 | bool useExtendedConvexCombination = (i > numberOfRays/2);
|
---|
1786 | if (useExtendedConvexCombination) {
|
---|
1787 | float w1, w2, w3;
|
---|
1788 | GenerateExtendedConvexCombinationWeights(w1, w2, w3, overlap);
|
---|
1789 | origin = w1*o1 + w2*o2 + w3*o3;
|
---|
1790 | direction =
|
---|
1791 | w1*leaf->rays[r1].mRay->GetDir() +
|
---|
1792 | w2*leaf->rays[r2].mRay->GetDir() +
|
---|
1793 | w3*leaf->rays[r3].mRay->GetDir();
|
---|
1794 | // shift the origin a little bit
|
---|
1795 | origin += direction*0.1f;
|
---|
1796 | } else {
|
---|
1797 | origin = GetBBox(leaf).GetRandomPoint();
|
---|
1798 | Vector3 dirVector = GetDirBBox(leaf).GetRandomPoint();
|
---|
1799 | direction = Vector3(sin(dirVector.x), sin(dirVector.y), cos(dirVector.x));
|
---|
1800 | }
|
---|
1801 | //cout<<"dir vector.x="<<dirVector.x<<"direction'.x="<<atan2(direction.x, direction.y)<<endl;
|
---|
1802 | rays.push_back(SimpleRay(origin, direction));
|
---|
1803 | }
|
---|
1804 | }
|
---|
1805 |
|
---|
1806 | int
|
---|
1807 | RssTree::GenerateRays(const int numberOfRays,
|
---|
1808 | const int numberOfLeaves,
|
---|
1809 | SimpleRayContainer &rays)
|
---|
1810 | {
|
---|
1811 |
|
---|
1812 | vector<RssTreeLeaf *> leaves;
|
---|
1813 |
|
---|
1814 | CollectLeaves(leaves);
|
---|
1815 |
|
---|
1816 | sort(leaves.begin(),
|
---|
1817 | leaves.end(),
|
---|
1818 | GreaterContribution);
|
---|
1819 |
|
---|
1820 |
|
---|
1821 | float sumContrib = 0.0;
|
---|
1822 | int i;
|
---|
1823 | int k = 0;
|
---|
1824 | for (i=0; i < leaves.size() && k < numberOfLeaves; i++)
|
---|
1825 | if (ValidLeaf(leaves[i])) {
|
---|
1826 | float c = leaves[i]->GetImportance();
|
---|
1827 | sumContrib += c;
|
---|
1828 | // cout<<"ray contrib "<<i<<" : "<<c<<endl;
|
---|
1829 | k++;
|
---|
1830 | }
|
---|
1831 |
|
---|
1832 | float avgContrib = sumContrib/numberOfLeaves;
|
---|
1833 | float ratioPerLeaf = numberOfRays/(avgContrib*numberOfLeaves);
|
---|
1834 | k = 0;
|
---|
1835 | for (i=0; i < leaves.size() && k < numberOfLeaves; i++)
|
---|
1836 | if (ValidLeaf(leaves[i])) {
|
---|
1837 | k++;
|
---|
1838 | RssTreeLeaf *leaf = leaves[i];
|
---|
1839 | float c = leaf->GetImportance();
|
---|
1840 | int num = (c*ratioPerLeaf + 0.5);
|
---|
1841 | GenerateLeafRays(leaf, num, rays);
|
---|
1842 | }
|
---|
1843 |
|
---|
1844 | return rays.size();
|
---|
1845 | }
|
---|
1846 |
|
---|
1847 |
|
---|
1848 | float
|
---|
1849 | RssTree::GetAvgPvsSize()
|
---|
1850 | {
|
---|
1851 | stack<RssTreeNode *> tstack;
|
---|
1852 | tstack.push(root);
|
---|
1853 |
|
---|
1854 | int sumPvs = 0;
|
---|
1855 | int leaves = 0;
|
---|
1856 | while (!tstack.empty()) {
|
---|
1857 | RssTreeNode *node = tstack.top();
|
---|
1858 | tstack.pop();
|
---|
1859 |
|
---|
1860 | if (node->IsLeaf()) {
|
---|
1861 | RssTreeLeaf *leaf = (RssTreeLeaf *)node;
|
---|
1862 | // update pvs size
|
---|
1863 | leaf->UpdatePvsSize();
|
---|
1864 | sumPvs += leaf->GetPvsSize();
|
---|
1865 | leaves++;
|
---|
1866 | } else {
|
---|
1867 | RssTreeInterior *in = (RssTreeInterior *)node;
|
---|
1868 | // both nodes for directional splits
|
---|
1869 | tstack.push(in->front);
|
---|
1870 | tstack.push(in->back);
|
---|
1871 | }
|
---|
1872 | }
|
---|
1873 |
|
---|
1874 |
|
---|
1875 | return sumPvs/(float)leaves;
|
---|
1876 | }
|
---|
1877 |
|
---|
1878 |
|
---|
1879 | float
|
---|
1880 | RssTreeLeaf::GetImportance() const
|
---|
1881 | {
|
---|
1882 |
|
---|
1883 | if (1) {
|
---|
1884 | return GetAvgRayContribution();
|
---|
1885 | // return GetPvsSize();
|
---|
1886 | } else {
|
---|
1887 | // return GetAvgRayContribution()*mEntropyImportance;
|
---|
1888 | //return GetAvgRayContribution();
|
---|
1889 | return mEntropyImportance;
|
---|
1890 | }
|
---|
1891 | }
|
---|
1892 |
|
---|
1893 |
|
---|
1894 | float
|
---|
1895 | RssTreeLeaf::ComputePvsEntropy()
|
---|
1896 | {
|
---|
1897 | int samples = 0;
|
---|
1898 | Intersectable::NewMail();
|
---|
1899 | // set all object as belonging to the fron pvs
|
---|
1900 | for(RssTreeNode::RayInfoContainer::iterator ri = rays.begin();
|
---|
1901 | ri != rays.end();
|
---|
1902 | ri++)
|
---|
1903 | if ((*ri).mRay->IsActive()) {
|
---|
1904 | Intersectable *object = (*ri).mRay->mTerminationObject;
|
---|
1905 | if (object) {
|
---|
1906 | if (!object->Mailed()) {
|
---|
1907 | object->Mail();
|
---|
1908 | object->mCounter = 1;
|
---|
1909 | } else
|
---|
1910 | object->mCounter++;
|
---|
1911 | samples++;
|
---|
1912 | }
|
---|
1913 | }
|
---|
1914 |
|
---|
1915 | float entropy = 0.0f;
|
---|
1916 |
|
---|
1917 | if (samples > 1) {
|
---|
1918 | Intersectable::NewMail();
|
---|
1919 | for(RayInfoContainer::const_iterator ri = rays.begin();
|
---|
1920 | ri != rays.end();
|
---|
1921 | ri++)
|
---|
1922 | if ((*ri).mRay->IsActive()) {
|
---|
1923 | Intersectable *object = (*ri).mRay->mTerminationObject;
|
---|
1924 | if (object) {
|
---|
1925 | if (!object->Mailed()) {
|
---|
1926 | object->Mail();
|
---|
1927 | float p = object->mCounter/(float)samples;
|
---|
1928 | entropy -= p*log(p);
|
---|
1929 | }
|
---|
1930 | }
|
---|
1931 | }
|
---|
1932 | entropy = entropy/log((float)samples);
|
---|
1933 | }
|
---|
1934 | else
|
---|
1935 | entropy = 1.0f;
|
---|
1936 |
|
---|
1937 | return entropy;
|
---|
1938 | }
|
---|
1939 |
|
---|
1940 | float
|
---|
1941 | RssTreeLeaf::ComputeRayLengthEntropy()
|
---|
1942 | {
|
---|
1943 | // get sum of all ray lengths
|
---|
1944 | // consider only passing rays or originating rays
|
---|
1945 | float sum = 0.0f;
|
---|
1946 | int samples = 0;
|
---|
1947 | int i=0;
|
---|
1948 | for(RayInfoContainer::const_iterator ri = rays.begin();
|
---|
1949 | ri != rays.end();
|
---|
1950 | ri++)
|
---|
1951 | if ((*ri).mRay->IsActive()) {
|
---|
1952 | // float s;
|
---|
1953 | // if (i == 0)
|
---|
1954 | // s = 200;
|
---|
1955 | // else
|
---|
1956 | // s = 100;
|
---|
1957 | // i++;
|
---|
1958 |
|
---|
1959 | sum += (*ri).mRay->GetSize();
|
---|
1960 | samples++;
|
---|
1961 | }
|
---|
1962 |
|
---|
1963 |
|
---|
1964 | float entropy = 0.0f;
|
---|
1965 |
|
---|
1966 | if (samples > 1) {
|
---|
1967 | i = 0;
|
---|
1968 | for(RayInfoContainer::const_iterator ri = rays.begin();
|
---|
1969 | ri != rays.end();
|
---|
1970 | ri++)
|
---|
1971 | if ((*ri).mRay->IsActive()) {
|
---|
1972 | // float s;
|
---|
1973 | // if (i==0)
|
---|
1974 | // s = 200;
|
---|
1975 | // else
|
---|
1976 | // s = 100;
|
---|
1977 | // i++;
|
---|
1978 | // float p = s/sum;
|
---|
1979 | float p = (*ri).mRay->GetSize()/sum;
|
---|
1980 | entropy -= p*log(p);
|
---|
1981 | }
|
---|
1982 | entropy = entropy/log((float)samples);
|
---|
1983 | } else
|
---|
1984 | entropy = 1.0f;
|
---|
1985 |
|
---|
1986 | return entropy;
|
---|
1987 | }
|
---|
1988 |
|
---|
1989 |
|
---|
1990 |
|
---|
1991 | void
|
---|
1992 | RssTreeLeaf::ComputeEntropyImportance()
|
---|
1993 | {
|
---|
1994 | mPvsEntropy = ComputePvsEntropy();
|
---|
1995 | mRayLengthEntropy = ComputeRayLengthEntropy();
|
---|
1996 |
|
---|
1997 | // mEntropy = 1.0f - ComputeRayLengthEntropy();
|
---|
1998 | mEntropyImportance = 1.0f - ComputePvsEntropy();
|
---|
1999 |
|
---|
2000 | // cout<<"ei="<<mEntropyImportance<<" ";
|
---|
2001 | }
|
---|
2002 |
|
---|
2003 |
|
---|
2004 | AxisAlignedBox3
|
---|
2005 | RssTree::GetShrankedBBox(const RssTreeNode *node) const
|
---|
2006 | {
|
---|
2007 | if (node->parent == NULL)
|
---|
2008 | return bbox;
|
---|
2009 |
|
---|
2010 | if (!node->IsLeaf())
|
---|
2011 | return ((RssTreeInterior *)node)->bbox;
|
---|
2012 |
|
---|
2013 | // evaluate bounding box from the ray origins
|
---|
2014 | AxisAlignedBox3 box;
|
---|
2015 | box.Initialize();
|
---|
2016 | RssTreeLeaf *leaf = (RssTreeLeaf *)node;
|
---|
2017 | for(RssTreeNode::RayInfoContainer::iterator ri = leaf->rays.begin();
|
---|
2018 | ri != leaf->rays.end();
|
---|
2019 | ri++)
|
---|
2020 | if ((*ri).mRay->IsActive()) {
|
---|
2021 | box.Include((*ri).GetOrigin());
|
---|
2022 | }
|
---|
2023 | return box;
|
---|
2024 | }
|
---|