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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 |
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124 | environment->GetBoolValue("RssTree.interleaveDirSplits", mInterleaveDirSplits);
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125 | environment->GetIntValue("RssTree.dirSplitDepth", mDirSplitDepth);
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126 |
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127 | root = NULL;
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128 |
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129 | splitCandidates = new vector<SortableEntry>;
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130 | }
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131 |
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132 |
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133 | RssTree::~RssTree()
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134 | {
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135 | if (root)
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136 | delete root;
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137 | }
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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 | void
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143 | RssStatistics::Print(ostream &app) const
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144 | {
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145 | app << "===== RssTree statistics ===============\n";
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146 |
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147 | app << "#N_RAYS ( Number of rays )\n"
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148 | << rays <<endl;
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149 |
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150 | app << "#N_INITPVS ( Initial PVS size )\n"
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151 | << initialPvsSize <<endl;
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152 |
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153 | app << "#N_NODES ( Number of nodes )\n" << nodes << "\n";
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154 |
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155 | app << "#N_LEAVES ( Number of leaves )\n" << Leaves() << "\n";
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156 |
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157 | app << "#N_SPLITS ( Number of splits in axes x y z dx dy dz \n";
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158 | for (int i=0; i<7; i++)
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159 | app << splits[i] <<" ";
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160 | app <<endl;
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161 |
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162 | app << "#N_RAYREFS ( Number of rayRefs )\n" <<
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163 | rayRefs << "\n";
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164 |
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165 | app << "#N_RAYRAYREFS ( Number of rayRefs / ray )\n" <<
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166 | rayRefs/(double)rays << "\n";
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167 |
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168 | app << "#N_LEAFRAYREFS ( Number of rayRefs / leaf )\n" <<
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169 | rayRefs/(double)Leaves() << "\n";
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170 |
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171 | app << "#N_MAXRAYREFS ( Max number of rayRefs / leaf )\n" <<
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172 | maxRayRefs << "\n";
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173 |
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174 |
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175 | // app << setprecision(4);
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176 |
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177 | app << "#N_PMAXDEPTHLEAVES ( Percentage of leaves at maxdepth )\n"<<
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178 | maxDepthNodes*100/(double)Leaves()<<endl;
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179 |
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180 | app << "#N_PMINPVSLEAVES ( Percentage of leaves with minCost )\n"<<
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181 | minPvsNodes*100/(double)Leaves()<<endl;
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182 |
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183 | app << "#N_PMINRAYSLEAVES ( Percentage of leaves with minCost )\n"<<
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184 | minRaysNodes*100/(double)Leaves()<<endl;
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185 |
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186 | app << "#N_PMINSIZELEAVES ( Percentage of leaves with minSize )\n"<<
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187 | minSizeNodes*100/(double)Leaves()<<endl;
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188 |
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189 | app << "#N_PMAXRAYCONTRIBLEAVES ( Percentage of leaves with maximal ray contribution )\n"<<
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190 | maxRayContribNodes*100/(double)Leaves()<<endl;
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191 |
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192 | app << "#N_PMAXCOSTRATIOLEAVES ( Percentage of leaves with max cost ratio )\n"<<
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193 | maxCostRatioNodes*100/(double)Leaves()<<endl;
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194 |
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195 | app << "#N_ADDED_RAYREFS (Number of dynamically added ray references )\n"<<
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196 | addedRayRefs<<endl;
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197 |
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198 | app << "#N_REMOVED_RAYREFS (Number of dynamically removed ray references )\n"<<
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199 | removedRayRefs<<endl;
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200 |
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201 | // app << setprecision(4);
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202 |
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203 | app << "#N_CTIME ( Construction time [s] )\n"
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204 | << Time() << " \n";
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205 |
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206 | app << "===== END OF RssTree statistics ==========\n";
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207 |
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208 | }
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209 |
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210 |
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211 | void
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212 | RssTreeLeaf::UpdatePvsSize()
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213 | {
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214 | if (!mValidPvs) {
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215 | Intersectable::NewMail();
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216 | int pvsSize = 0;
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217 | for(RssTreeNode::RayInfoContainer::iterator ri = rays.begin();
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218 | ri != rays.end();
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219 | ri++)
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220 | if ((*ri).mRay->IsActive()) {
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221 | Intersectable *object;
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222 | #if BIDIRECTIONAL_RAY
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223 | object = (*ri).mRay->mOriginObject;
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224 | if (object && !object->Mailed()) {
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225 | pvsSize++;
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226 | object->Mail();
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227 | }
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228 | #endif
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229 | object = (*ri).mRay->mTerminationObject;
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230 | if (object && !object->Mailed()) {
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231 | pvsSize++;
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232 | object->Mail();
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233 | }
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234 | }
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235 | mPvsSize = pvsSize;
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236 | mValidPvs = true;
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237 |
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238 | ComputeEntropyImportance();
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239 | }
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240 | }
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241 |
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242 | bool
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243 | RssTree::ClipRay(
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244 | RssTreeNode::RayInfo &rayInfo,
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245 | const AxisAlignedBox3 &box
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246 | )
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247 | {
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248 | float tmin, tmax;
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249 | static Ray ray;
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250 | ray.Init(rayInfo.mRay->GetOrigin(), rayInfo.mRay->GetDir(), Ray::LINE_SEGMENT);
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251 | box.ComputeMinMaxT(ray, &tmin, &tmax);
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252 | if (tmin >= tmax)
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253 | return false;
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254 |
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255 | // now check if the ray origin lies inside the box
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256 | if ( tmax < rayInfo.mRay->GetSize() ) {
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257 | // this ray does not leave the box
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258 | rayInfo.mRay->SetupEndPoints(
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259 | ray.Extrap(tmax),
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260 | rayInfo.mRay->mTermination
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261 | );
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262 | return true;
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263 | }
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264 |
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265 | return false;
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266 | }
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267 |
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268 |
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269 | void
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270 | RssTree::Construct(
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271 | VssRayContainer &rays,
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272 | // forced bounding box is only used when computing from-box
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273 | // visibility
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274 | AxisAlignedBox3 *forcedBoundingBox
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275 | )
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276 | {
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277 | stat.Start();
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278 |
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279 | maxMemory = maxStaticMemory;
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280 |
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281 | if (root)
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282 | delete root;
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283 |
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284 | root = new RssTreeLeaf(NULL, rays.size());
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285 | // first construct a leaf that will get subdivide
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286 | RssTreeLeaf *leaf = (RssTreeLeaf *) root;
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287 |
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288 | stat.nodes = 1;
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289 |
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290 | bbox.Initialize();
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291 | dirBBox.Initialize();
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292 |
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293 |
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294 | mForcedBoundingBox = forcedBoundingBox;
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295 | for(VssRayContainer::const_iterator ri = rays.begin();
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296 | ri != rays.end();
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297 | ri++) {
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298 |
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299 | RssTreeNode::RayInfo info(*ri);
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300 | if (forcedBoundingBox)
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301 | if (!ClipRay(info, *forcedBoundingBox))
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302 | continue;
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303 |
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304 | leaf->AddRay(info);
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305 |
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306 | bbox.Include((*ri)->GetOrigin());
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307 | bbox.Include((*ri)->GetTermination());
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308 |
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309 |
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310 | dirBBox.Include(Vector3(
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311 | (*ri)->GetDirParametrization(0),
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312 | (*ri)->GetDirParametrization(1),
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313 | 0
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314 | )
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315 | );
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316 | }
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317 |
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318 |
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319 | if ( forcedBoundingBox )
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320 | bbox = *forcedBoundingBox;
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321 |
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322 | cout<<"Bbox = "<<bbox<<endl;
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323 | cout<<"Dirr Bbox = "<<dirBBox<<endl;
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324 |
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325 | stat.rays = leaf->rays.size();
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326 | leaf->UpdatePvsSize();
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327 | leaf->ComputeEntropyImportance();
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328 |
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329 | stat.initialPvsSize = leaf->GetPvsSize();
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330 | // Subdivide();
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331 | root = Subdivide(TraversalData(leaf, bbox, 0));
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332 |
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333 | if (splitCandidates) {
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334 | // force realease of this vector
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335 | delete splitCandidates;
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336 | splitCandidates = new vector<SortableEntry>;
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337 | }
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338 |
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339 | stat.Stop();
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340 |
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341 | stat.Print(cout);
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342 | cout<<"#Total memory="<<GetMemUsage()<<endl;
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343 |
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344 | }
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345 |
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346 | int
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347 | RssTree::UpdateSubdivision()
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348 | {
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349 | priority_queue<TraversalData> tStack;
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350 | // stack<TraversalData> tStack;
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351 |
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352 | tStack.push(TraversalData(root, bbox, 0));
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353 |
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354 | AxisAlignedBox3 backBox;
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355 | AxisAlignedBox3 frontBox;
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356 |
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357 | maxMemory = maxTotalMemory;
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358 | int subdivided = 0;
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359 | int lastMem = 0;
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360 | while (!tStack.empty()) {
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361 |
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362 | float mem = GetMemUsage();
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363 |
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364 | if ( lastMem/10 != ((int)mem)/10) {
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365 | cout<<mem<<" MB"<<endl;
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366 | }
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367 | lastMem = (int)mem;
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368 |
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369 | if ( mem > maxMemory ) {
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370 | // count statistics on unprocessed leafs
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371 | while (!tStack.empty()) {
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372 | // EvaluateLeafStats(tStack.top());
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373 | tStack.pop();
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374 | }
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375 | break;
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376 | }
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377 |
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378 | TraversalData data = tStack.top();
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379 | tStack.pop();
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380 |
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381 | if (data.node->IsLeaf()) {
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382 | RssTreeNode *node = SubdivideNode((RssTreeLeaf *) data.node,
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383 | data.bbox,
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384 | backBox,
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385 | frontBox
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386 | );
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387 | if (!node->IsLeaf()) {
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388 | subdivided++;
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389 | RssTreeInterior *interior = (RssTreeInterior *) node;
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390 | // push the children on the stack
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391 | tStack.push(TraversalData(interior->back, backBox, data.depth+1));
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392 | tStack.push(TraversalData(interior->front, frontBox, data.depth+1));
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393 | } else {
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394 | // EvaluateLeafStats(data);
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395 | }
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396 | } else {
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397 | RssTreeInterior *interior = (RssTreeInterior *) data.node;
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398 | tStack.push(TraversalData(interior->back, GetBBox(interior->back), data.depth+1));
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399 | tStack.push(TraversalData(interior->front, GetBBox(interior->front), data.depth+1));
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400 | }
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401 | }
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402 | return subdivided;
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403 | }
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404 |
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405 |
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406 | RssTreeNode *
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407 | RssTree::Subdivide(const TraversalData &tdata)
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408 | {
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409 | RssTreeNode *result = NULL;
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410 |
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411 | priority_queue<TraversalData> tStack;
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412 | // stack<TraversalData> tStack;
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413 |
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414 | tStack.push(tdata);
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415 |
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416 | AxisAlignedBox3 backBox;
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417 | AxisAlignedBox3 frontBox;
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418 |
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419 |
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420 | int lastMem = 0;
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421 | while (!tStack.empty()) {
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422 |
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423 | float mem = GetMemUsage();
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424 |
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425 | if ( lastMem/10 != ((int)mem)/10) {
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426 | cout<<mem<<" MB"<<endl;
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427 | }
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428 | lastMem = (int)mem;
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429 |
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430 | if ( mem > maxMemory ) {
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431 | // count statistics on unprocessed leafs
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432 | while (!tStack.empty()) {
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433 | EvaluateLeafStats(tStack.top());
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434 | tStack.pop();
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435 | }
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436 | break;
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437 | }
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438 |
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439 | TraversalData data = tStack.top();
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440 | tStack.pop();
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441 |
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442 | #if DEBUG_SPLITS
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443 | Debug<<"#Splitting node"<<endl;
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444 | data.node->Print(Debug);
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445 | #endif
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446 | RssTreeNode *node = SubdivideNode((RssTreeLeaf *) data.node,
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447 | data.bbox,
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448 | backBox,
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449 | frontBox
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450 | );
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451 |
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452 |
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453 | if (result == NULL)
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454 | result = node;
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455 |
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456 | if (!node->IsLeaf()) {
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457 |
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458 | RssTreeInterior *interior = (RssTreeInterior *) node;
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459 | // push the children on the stack
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460 | tStack.push(TraversalData(interior->back, backBox, data.depth+1));
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461 | tStack.push(TraversalData(interior->front, frontBox, data.depth+1));
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462 |
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463 | #if DEBUG_SPLITS
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464 | Debug<<"#New nodes"<<endl;
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465 | interior->back->Print(Debug);
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466 | interior->front->Print(Debug);
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467 | Debug<<"#####################################"<<endl;
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468 | #endif
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469 |
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470 | } else {
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471 | EvaluateLeafStats(data);
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472 | }
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473 | }
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474 |
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475 | return result;
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476 | }
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477 |
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478 |
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479 | // returns selected plane for subdivision
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480 | int
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481 | RssTree::SelectPlane(
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482 | RssTreeLeaf *leaf,
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483 | const AxisAlignedBox3 &box,
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484 | float &position,
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485 | int &raysBack,
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486 | int &raysFront,
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487 | int &pvsBack,
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488 | int &pvsFront
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489 | )
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490 | {
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491 |
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492 | int minDirDepth = 6;
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493 | int axis;
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494 | float costRatio;
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495 |
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---|
496 | costRatio = BestCostRatio(leaf,
|
---|
497 | axis,
|
---|
498 | position,
|
---|
499 | raysBack,
|
---|
500 | raysFront,
|
---|
501 | pvsBack,
|
---|
502 | pvsFront
|
---|
503 | );
|
---|
504 | #if DEBUG_SPLIT_COST
|
---|
505 | cout<<axis<<" r="<<costRatio<<endl;
|
---|
506 | #endif
|
---|
507 | if (costRatio > termMaxCostRatio) {
|
---|
508 | // cout<<"Too big cost ratio "<<costRatio<<endl;
|
---|
509 | stat.maxCostRatioNodes++;
|
---|
510 | return -1;
|
---|
511 | }
|
---|
512 |
|
---|
513 | #if 0
|
---|
514 | cout<<
|
---|
515 | "pvs="<<leaf->mPvsSize<<
|
---|
516 | " rays="<<leaf->rays.size()<<
|
---|
517 | " rc="<<leaf->GetAvgRayContribution()<<
|
---|
518 | " axis="<<axis<<endl;
|
---|
519 | #endif
|
---|
520 |
|
---|
521 | return axis;
|
---|
522 | }
|
---|
523 |
|
---|
524 |
|
---|
525 | float
|
---|
526 | RssTree::GetCostRatio(
|
---|
527 | RssTreeLeaf *leaf,
|
---|
528 | const int axis,
|
---|
529 | const float position,
|
---|
530 | const int raysBack,
|
---|
531 | const int raysFront,
|
---|
532 | const int pvsBack,
|
---|
533 | const int pvsFront
|
---|
534 | )
|
---|
535 | {
|
---|
536 | bool costImportance = true;
|
---|
537 |
|
---|
538 | float ratio;
|
---|
539 | AxisAlignedBox3 box;
|
---|
540 | float minBox, maxBox;
|
---|
541 |
|
---|
542 | if (axis < 3) {
|
---|
543 | box = GetBBox(leaf);
|
---|
544 | minBox = box.Min(axis);
|
---|
545 | maxBox = box.Max(axis);
|
---|
546 | } else {
|
---|
547 | box = GetDirBBox(leaf);
|
---|
548 | minBox = box.Min(axis-3);
|
---|
549 | maxBox = box.Max(axis-3);
|
---|
550 | }
|
---|
551 |
|
---|
552 | float sizeBox = maxBox - minBox;
|
---|
553 |
|
---|
554 | int pvsSize = leaf->GetPvsSize();
|
---|
555 |
|
---|
556 | if (!costImportance) {
|
---|
557 | // float sum = raysBack*(position - minBox) + raysFront*(maxBox - position);
|
---|
558 | float sum = pvsBack*(position - minBox) + pvsFront*(maxBox - position);
|
---|
559 | float newCost = ct_div_ci + sum/sizeBox;
|
---|
560 | float oldCost = pvsSize;
|
---|
561 | ratio = newCost/oldCost;
|
---|
562 | } else {
|
---|
563 | // importance based cost
|
---|
564 | #if 0
|
---|
565 | float newContrib =
|
---|
566 | ((position - minBox)*sqr(pvsBack/(raysBack + Limits::Small)) +
|
---|
567 | (maxBox - position)*sqr(pvsFront/(raysFront + Limits::Small)))/sizeBox;
|
---|
568 |
|
---|
569 | // float newContrib =
|
---|
570 | // sqr(pvsBack/(raysBack + Limits::Small)) +
|
---|
571 | // sqr(pvsFront/(raysFront + Limits::Small));
|
---|
572 | float oldContrib = sqr(leaf->GetAvgRayContribution());
|
---|
573 | ratio = oldContrib/newContrib;
|
---|
574 | #else
|
---|
575 | #if 1
|
---|
576 | float newCost = raysBack*pvsBack + raysFront*pvsFront;
|
---|
577 | float oldCost = leaf->rays.size()*pvsSize;
|
---|
578 | ratio = newCost/oldCost;
|
---|
579 | #else
|
---|
580 | #if 0
|
---|
581 | float newCost = (pvsBack + pvsFront)*0.5f;
|
---|
582 | float oldCost = pvsSize;
|
---|
583 | ratio = newCost/oldCost;
|
---|
584 | #else
|
---|
585 | float newCost = abs(raysBack - raysFront);
|
---|
586 | float oldCost = leaf->rays.size();
|
---|
587 | ratio = newCost/oldCost;
|
---|
588 | #endif
|
---|
589 | #endif
|
---|
590 | #endif
|
---|
591 | }
|
---|
592 |
|
---|
593 | return ratio;
|
---|
594 | }
|
---|
595 |
|
---|
596 |
|
---|
597 | float
|
---|
598 | RssTree::EvalCostRatio(
|
---|
599 | RssTreeLeaf *leaf,
|
---|
600 | const int axis,
|
---|
601 | const float position,
|
---|
602 | int &raysBack,
|
---|
603 | int &raysFront,
|
---|
604 | int &pvsBack,
|
---|
605 | int &pvsFront
|
---|
606 | )
|
---|
607 | {
|
---|
608 | raysBack = 0;
|
---|
609 | raysFront = 0;
|
---|
610 | pvsFront = 0;
|
---|
611 | pvsBack = 0;
|
---|
612 |
|
---|
613 |
|
---|
614 | Intersectable::NewMail(3);
|
---|
615 |
|
---|
616 | if (axis <= RssTreeNode::SPLIT_Z) {
|
---|
617 | // this is the main ray classification loop!
|
---|
618 | for(RssTreeNode::RayInfoContainer::iterator ri = leaf->rays.begin();
|
---|
619 | ri != leaf->rays.end();
|
---|
620 | ri++)
|
---|
621 | if ((*ri).mRay->IsActive()) {
|
---|
622 |
|
---|
623 | // determine the side of this ray with respect to the plane
|
---|
624 | int side = (*ri).ComputeRaySide(axis, position);
|
---|
625 | // (*ri).mRay->mSide = side;
|
---|
626 |
|
---|
627 | if (side <= 0)
|
---|
628 | raysBack++;
|
---|
629 |
|
---|
630 | if (side >= 0)
|
---|
631 | raysFront++;
|
---|
632 |
|
---|
633 | AddObject2Pvs((*ri).mRay->mTerminationObject, side, pvsBack, pvsFront);
|
---|
634 | }
|
---|
635 |
|
---|
636 | } else {
|
---|
637 |
|
---|
638 | // directional split
|
---|
639 | for(RssTreeNode::RayInfoContainer::iterator ri = leaf->rays.begin();
|
---|
640 | ri != leaf->rays.end();
|
---|
641 | ri++)
|
---|
642 | if ((*ri).mRay->IsActive()) {
|
---|
643 |
|
---|
644 | // determine the side of this ray with respect to the plane
|
---|
645 | int side;
|
---|
646 | if ((*ri).mRay->GetDirParametrization(axis - 3) <= position)
|
---|
647 | side = -1;
|
---|
648 | else
|
---|
649 | side = 1;
|
---|
650 |
|
---|
651 | if (side <= 0)
|
---|
652 | raysBack++;
|
---|
653 |
|
---|
654 | if (side >= 0)
|
---|
655 | raysFront++;
|
---|
656 |
|
---|
657 | // (*ri).mRay->mSide = side;
|
---|
658 | AddObject2Pvs((*ri).mRay->mTerminationObject, side, pvsBack, pvsFront);
|
---|
659 |
|
---|
660 | }
|
---|
661 | }
|
---|
662 |
|
---|
663 | float ratio = GetCostRatio(
|
---|
664 | leaf,
|
---|
665 | axis,
|
---|
666 | position,
|
---|
667 | raysBack,
|
---|
668 | raysFront,
|
---|
669 | pvsBack,
|
---|
670 | pvsFront);
|
---|
671 |
|
---|
672 | // cout<<axis<<" "<<pvsSize<<" "<<pvsBack<<" "<<pvsFront<<endl;
|
---|
673 | // float oldCost = leaf->rays.size();
|
---|
674 |
|
---|
675 | // cout<<"ratio="<<ratio<<endl;
|
---|
676 |
|
---|
677 | return ratio;
|
---|
678 | }
|
---|
679 |
|
---|
680 | float
|
---|
681 | RssTree::BestCostRatio(
|
---|
682 | RssTreeLeaf *leaf,
|
---|
683 | int &axis,
|
---|
684 | float &position,
|
---|
685 | int &raysBack,
|
---|
686 | int &raysFront,
|
---|
687 | int &pvsBack,
|
---|
688 | int &pvsFront
|
---|
689 | )
|
---|
690 | {
|
---|
691 | int nRaysBack[6], nRaysFront[6];
|
---|
692 | int nPvsBack[6], nPvsFront[6];
|
---|
693 | float nPosition[6];
|
---|
694 | float nCostRatio[6];
|
---|
695 | int bestAxis = -1;
|
---|
696 |
|
---|
697 | AxisAlignedBox3 sBox = GetBBox(leaf);
|
---|
698 | AxisAlignedBox3 dBox = GetDirBBox(leaf);
|
---|
699 | // int sAxis = box.Size().DrivingAxis();
|
---|
700 | int sAxis = sBox.Size().DrivingAxis();
|
---|
701 | int dAxis = dBox.Size().DrivingAxis() + 3;
|
---|
702 |
|
---|
703 |
|
---|
704 | float dirSplitBoxSize = 0.01f;
|
---|
705 | bool allowDirSplit = Magnitude(sBox.Size())*dirSplitBoxSize < Magnitude(bbox.Size());
|
---|
706 |
|
---|
707 |
|
---|
708 | for (axis = 0; axis < 5; axis++)
|
---|
709 | if (
|
---|
710 | (axis < 3 && (leaf->depth < mDirSplitDepth || mInterleaveDirSplits)) ||
|
---|
711 | (axis >= 3 && (leaf->depth >= mDirSplitDepth))
|
---|
712 | ) {
|
---|
713 | if (!mSplitUseOnlyDrivingAxis || axis == sAxis || axis == dAxis) {
|
---|
714 |
|
---|
715 | if (splitType == ESplitRegular) {
|
---|
716 | if (axis < 3)
|
---|
717 | nPosition[axis] = (sBox.Min()[axis] + sBox.Max()[axis])*0.5f;
|
---|
718 | else
|
---|
719 | nPosition[axis] = (dBox.Min()[axis-3] + dBox.Max()[axis-3])*0.5f;
|
---|
720 |
|
---|
721 | nCostRatio[axis] = EvalCostRatio(leaf,
|
---|
722 | axis,
|
---|
723 | nPosition[axis],
|
---|
724 | nRaysBack[axis],
|
---|
725 | nRaysFront[axis],
|
---|
726 | nPvsBack[axis],
|
---|
727 | nPvsFront[axis]
|
---|
728 | );
|
---|
729 | } else
|
---|
730 | if (splitType == ESplitHeuristic) {
|
---|
731 | nCostRatio[axis] = EvalCostRatioHeuristic(
|
---|
732 | leaf,
|
---|
733 | axis,
|
---|
734 | nPosition[axis],
|
---|
735 | nRaysBack[axis],
|
---|
736 | nRaysFront[axis],
|
---|
737 | nPvsBack[axis],
|
---|
738 | nPvsFront[axis]);
|
---|
739 | } else
|
---|
740 | if (splitType == ESplitHybrid) {
|
---|
741 | if (leaf->depth > 7)
|
---|
742 | nCostRatio[axis] = EvalCostRatioHeuristic(
|
---|
743 | leaf,
|
---|
744 | axis,
|
---|
745 | nPosition[axis],
|
---|
746 | nRaysBack[axis],
|
---|
747 | nRaysFront[axis],
|
---|
748 | nPvsBack[axis],
|
---|
749 | nPvsFront[axis]);
|
---|
750 | else {
|
---|
751 | if (axis < 3)
|
---|
752 | nPosition[axis] = (sBox.Min()[axis] + sBox.Max()[axis])*0.5f;
|
---|
753 | else
|
---|
754 | nPosition[axis] = (dBox.Min()[axis-3] + dBox.Max()[axis-3])*0.5f;
|
---|
755 |
|
---|
756 | nCostRatio[axis] = EvalCostRatio(leaf,
|
---|
757 | axis,
|
---|
758 | nPosition[axis],
|
---|
759 | nRaysBack[axis],
|
---|
760 | nRaysFront[axis],
|
---|
761 | nPvsBack[axis],
|
---|
762 | nPvsFront[axis]
|
---|
763 | );
|
---|
764 | }
|
---|
765 | } else {
|
---|
766 | cerr<<"RssTree: Unknown split heuristics\n";
|
---|
767 | exit(1);
|
---|
768 | }
|
---|
769 |
|
---|
770 |
|
---|
771 | if ( bestAxis == -1)
|
---|
772 | bestAxis = axis;
|
---|
773 | else
|
---|
774 | if ( nCostRatio[axis] < nCostRatio[bestAxis] )
|
---|
775 | bestAxis = axis;
|
---|
776 | }
|
---|
777 | }
|
---|
778 |
|
---|
779 | axis = bestAxis;
|
---|
780 | position = nPosition[bestAxis];
|
---|
781 |
|
---|
782 | raysBack = nRaysBack[bestAxis];
|
---|
783 | raysFront = nRaysFront[bestAxis];
|
---|
784 |
|
---|
785 | pvsBack = nPvsBack[bestAxis];
|
---|
786 | pvsFront = nPvsFront[bestAxis];
|
---|
787 |
|
---|
788 | return nCostRatio[bestAxis];
|
---|
789 | }
|
---|
790 |
|
---|
791 |
|
---|
792 | float
|
---|
793 | RssTree::EvalCostRatioHeuristic(
|
---|
794 | RssTreeLeaf *leaf,
|
---|
795 | const int axis,
|
---|
796 | float &bestPosition,
|
---|
797 | int &raysBack,
|
---|
798 | int &raysFront,
|
---|
799 | int &pvsBack,
|
---|
800 | int &pvsFront
|
---|
801 | )
|
---|
802 | {
|
---|
803 | AxisAlignedBox3 box;
|
---|
804 | float minBox, maxBox;
|
---|
805 |
|
---|
806 | if (axis < 3) {
|
---|
807 | box = GetBBox(leaf);
|
---|
808 | minBox = box.Min(axis);
|
---|
809 | maxBox = box.Max(axis);
|
---|
810 | } else {
|
---|
811 | box = GetDirBBox(leaf);
|
---|
812 | minBox = box.Min(axis-3);
|
---|
813 | maxBox = box.Max(axis-3);
|
---|
814 | }
|
---|
815 |
|
---|
816 | SortSplitCandidates(leaf, axis);
|
---|
817 |
|
---|
818 | // go through the lists, count the number of objects left and right
|
---|
819 | // and evaluate the following cost funcion:
|
---|
820 | // C = ct_div_ci + (ql*rl + qr*rr)/queries
|
---|
821 |
|
---|
822 | int rl=0, rr = leaf->rays.size();
|
---|
823 | int pl=0, pr = leaf->GetPvsSize();
|
---|
824 | float sizeBox = maxBox - minBox;
|
---|
825 |
|
---|
826 | float minBand = minBox + 0.1*(maxBox - minBox);
|
---|
827 | float maxBand = minBox + 0.9*(maxBox - minBox);
|
---|
828 |
|
---|
829 | float minRatio = 1e20;
|
---|
830 |
|
---|
831 | Intersectable::NewMail();
|
---|
832 | // set all object as belonging to the fron pvs
|
---|
833 | for(RssTreeNode::RayInfoContainer::iterator ri = leaf->rays.begin();
|
---|
834 | ri != leaf->rays.end();
|
---|
835 | ri++)
|
---|
836 | if ((*ri).mRay->IsActive()) {
|
---|
837 | Intersectable *object = (*ri).mRay->mTerminationObject;
|
---|
838 | if (object)
|
---|
839 | if (!object->Mailed()) {
|
---|
840 | object->Mail();
|
---|
841 | object->mCounter = 1;
|
---|
842 | } else
|
---|
843 | object->mCounter++;
|
---|
844 | }
|
---|
845 |
|
---|
846 | Intersectable::NewMail();
|
---|
847 |
|
---|
848 | for(vector<SortableEntry>::const_iterator ci = splitCandidates->begin();
|
---|
849 | ci < splitCandidates->end();
|
---|
850 | ci++) {
|
---|
851 | VssRay *ray;
|
---|
852 | switch ((*ci).type) {
|
---|
853 | case SortableEntry::ERayMin: {
|
---|
854 | rr--;
|
---|
855 | rl++;
|
---|
856 | ray = (VssRay *) (*ci).data;
|
---|
857 | Intersectable *object = ray->mTerminationObject;
|
---|
858 | if (object) {
|
---|
859 | if (!object->Mailed()) {
|
---|
860 | object->Mail();
|
---|
861 | pl++;
|
---|
862 | }
|
---|
863 | if (--object->mCounter == 0)
|
---|
864 | pr--;
|
---|
865 | }
|
---|
866 | break;
|
---|
867 | }
|
---|
868 | }
|
---|
869 |
|
---|
870 | float position = (*ci).value;
|
---|
871 |
|
---|
872 | if (position > minBand && position < maxBand) {
|
---|
873 |
|
---|
874 | float ratio = GetCostRatio(
|
---|
875 | leaf,
|
---|
876 | axis,
|
---|
877 | position,
|
---|
878 | rl,
|
---|
879 | rr,
|
---|
880 | pl,
|
---|
881 | pr);
|
---|
882 |
|
---|
883 |
|
---|
884 | // cout<<"pos="<<(*ci).value<<"\t q=("<<ql<<","<<qr<<")\t r=("<<rl<<","<<rr<<")"<<endl;
|
---|
885 | // cout<<"cost= "<<sum<<endl;
|
---|
886 |
|
---|
887 | if (ratio < minRatio) {
|
---|
888 | minRatio = ratio;
|
---|
889 | bestPosition = position;
|
---|
890 |
|
---|
891 | raysBack = rl;
|
---|
892 | raysFront = rr;
|
---|
893 |
|
---|
894 | pvsBack = pl;
|
---|
895 | pvsFront = pr;
|
---|
896 |
|
---|
897 | }
|
---|
898 | }
|
---|
899 | }
|
---|
900 |
|
---|
901 |
|
---|
902 | // cout<<"===================="<<endl;
|
---|
903 | // cout<<"costRatio="<<ratio<<" pos="<<position<<" t="<<(position - minBox)/(maxBox - minBox)
|
---|
904 | // <<"\t q=("<<queriesBack<<","<<queriesFront<<")\t r=("<<raysBack<<","<<raysFront<<")"<<endl;
|
---|
905 | return minRatio;
|
---|
906 | }
|
---|
907 |
|
---|
908 | void
|
---|
909 | RssTree::SortSplitCandidates(
|
---|
910 | RssTreeLeaf *node,
|
---|
911 | const int axis
|
---|
912 | )
|
---|
913 | {
|
---|
914 |
|
---|
915 | splitCandidates->clear();
|
---|
916 |
|
---|
917 | int requestedSize = 2*(node->rays.size());
|
---|
918 | // creates a sorted split candidates array
|
---|
919 | if (splitCandidates->capacity() > 500000 &&
|
---|
920 | requestedSize < (int)(splitCandidates->capacity()/10) ) {
|
---|
921 |
|
---|
922 | delete splitCandidates;
|
---|
923 | splitCandidates = new vector<SortableEntry>;
|
---|
924 | }
|
---|
925 |
|
---|
926 | splitCandidates->reserve(requestedSize);
|
---|
927 |
|
---|
928 | // insert all queries
|
---|
929 | for(RssTreeNode::RayInfoContainer::const_iterator ri = node->rays.begin();
|
---|
930 | ri < node->rays.end();
|
---|
931 | ri++) {
|
---|
932 | if ((*ri).mRay->IsActive()) {
|
---|
933 | if (axis < 3) {
|
---|
934 | splitCandidates->push_back(SortableEntry(SortableEntry::ERayMin,
|
---|
935 | (*ri).ExtrapOrigin(axis),
|
---|
936 | (void *)(*ri).mRay)
|
---|
937 | );
|
---|
938 | } else {
|
---|
939 | float pos = (*ri).mRay->GetDirParametrization(axis-3);
|
---|
940 | splitCandidates->push_back(SortableEntry(SortableEntry::ERayMin,
|
---|
941 | pos,
|
---|
942 | (void *)(*ri).mRay)
|
---|
943 | );
|
---|
944 | }
|
---|
945 | }
|
---|
946 | }
|
---|
947 |
|
---|
948 | stable_sort(splitCandidates->begin(), splitCandidates->end());
|
---|
949 | }
|
---|
950 |
|
---|
951 |
|
---|
952 | void
|
---|
953 | RssTree::EvaluateLeafStats(const TraversalData &data)
|
---|
954 | {
|
---|
955 |
|
---|
956 | // the node became a leaf -> evaluate stats for leafs
|
---|
957 | RssTreeLeaf *leaf = (RssTreeLeaf *)data.node;
|
---|
958 |
|
---|
959 | if (data.depth >= termMaxDepth)
|
---|
960 | stat.maxDepthNodes++;
|
---|
961 |
|
---|
962 | // if ( (int)(leaf->rays.size()) < termMinCost)
|
---|
963 | // stat.minCostNodes++;
|
---|
964 | if ( leaf->GetPvsSize() < termMinPvs)
|
---|
965 | stat.minPvsNodes++;
|
---|
966 |
|
---|
967 | if ( leaf->GetPvsSize() < termMinRays)
|
---|
968 | stat.minRaysNodes++;
|
---|
969 |
|
---|
970 | if (leaf->GetAvgRayContribution() > termMaxRayContribution )
|
---|
971 | stat.maxRayContribNodes++;
|
---|
972 |
|
---|
973 | if (SqrMagnitude(data.bbox.Size()) <= termMinSize) {
|
---|
974 | stat.minSizeNodes++;
|
---|
975 | }
|
---|
976 |
|
---|
977 | if ( (int)(leaf->rays.size()) > stat.maxRayRefs)
|
---|
978 | stat.maxRayRefs = leaf->rays.size();
|
---|
979 |
|
---|
980 | }
|
---|
981 |
|
---|
982 | bool
|
---|
983 | RssTree::TerminationCriteriaSatisfied(RssTreeLeaf *leaf)
|
---|
984 | {
|
---|
985 | return ( (leaf->GetPvsSize() < termMinPvs) ||
|
---|
986 | (leaf->rays.size() < termMinRays) ||
|
---|
987 | // (leaf->GetAvgRayContribution() > termMaxRayContribution ) ||
|
---|
988 | (leaf->depth >= termMaxDepth) ||
|
---|
989 | (SqrMagnitude(GetBBox(leaf).Size()) <= termMinSize)
|
---|
990 | );
|
---|
991 | }
|
---|
992 |
|
---|
993 |
|
---|
994 | RssTreeNode *
|
---|
995 | RssTree::SubdivideNode(
|
---|
996 | RssTreeLeaf *leaf,
|
---|
997 | const AxisAlignedBox3 &box,
|
---|
998 | AxisAlignedBox3 &backBBox,
|
---|
999 | AxisAlignedBox3 &frontBBox
|
---|
1000 | )
|
---|
1001 | {
|
---|
1002 |
|
---|
1003 | if (TerminationCriteriaSatisfied(leaf)) {
|
---|
1004 | #if 0
|
---|
1005 | if (leaf->depth >= termMaxDepth) {
|
---|
1006 | cout<<"Warning: max depth reached depth="<<(int)leaf->depth<<" rays="<<leaf->rays.size()<<endl;
|
---|
1007 | cout<<"Bbox: "<<GetBBox(leaf)<<" dirbbox:"<<GetDirBBox(leaf)<<endl;
|
---|
1008 | }
|
---|
1009 | #endif
|
---|
1010 |
|
---|
1011 | return leaf;
|
---|
1012 | }
|
---|
1013 |
|
---|
1014 | float position;
|
---|
1015 |
|
---|
1016 | // first count ray sides
|
---|
1017 | int raysBack;
|
---|
1018 | int raysFront;
|
---|
1019 | int pvsBack;
|
---|
1020 | int pvsFront;
|
---|
1021 |
|
---|
1022 | // select subdivision axis
|
---|
1023 | int axis = SelectPlane( leaf, box, position, raysBack, raysFront, pvsBack, pvsFront);
|
---|
1024 | Debug<<"axis="<<axis<<" depth="<<(int)leaf->depth<<" rb="<<raysBack<<" rf="<<raysFront<<" pvsb="<<pvsBack<<" pvsf="<<pvsFront<<endl;
|
---|
1025 |
|
---|
1026 | if (axis == -1) {
|
---|
1027 | return leaf;
|
---|
1028 | }
|
---|
1029 |
|
---|
1030 | stat.nodes+=2;
|
---|
1031 | stat.splits[axis]++;
|
---|
1032 |
|
---|
1033 | // add the new nodes to the tree
|
---|
1034 | RssTreeInterior *node = new RssTreeInterior(leaf->parent);
|
---|
1035 |
|
---|
1036 | node->axis = axis;
|
---|
1037 | node->position = position;
|
---|
1038 | node->bbox = box;
|
---|
1039 | node->dirBBox = GetDirBBox(leaf);
|
---|
1040 |
|
---|
1041 | backBBox = box;
|
---|
1042 | frontBBox = box;
|
---|
1043 |
|
---|
1044 | RssTreeLeaf *back = new RssTreeLeaf(node, raysBack);
|
---|
1045 | RssTreeLeaf *front = new RssTreeLeaf(node, raysFront);
|
---|
1046 |
|
---|
1047 | // replace a link from node's parent
|
---|
1048 | if ( leaf->parent )
|
---|
1049 | leaf->parent->ReplaceChildLink(leaf, node);
|
---|
1050 | // and setup child links
|
---|
1051 | node->SetupChildLinks(back, front);
|
---|
1052 |
|
---|
1053 | if (axis <= RssTreeNode::SPLIT_Z) {
|
---|
1054 | backBBox.SetMax(axis, position);
|
---|
1055 | frontBBox.SetMin(axis, position);
|
---|
1056 |
|
---|
1057 | for(RssTreeNode::RayInfoContainer::iterator ri = leaf->rays.begin();
|
---|
1058 | ri != leaf->rays.end();
|
---|
1059 | ri++) {
|
---|
1060 | if ((*ri).mRay->IsActive()) {
|
---|
1061 |
|
---|
1062 | // first unref ray from the former leaf
|
---|
1063 | (*ri).mRay->Unref();
|
---|
1064 |
|
---|
1065 | // Debug << "computed t: " << (*ri).mRay->mT << endl;
|
---|
1066 | // determine the side of this ray with respect to the plane
|
---|
1067 | int side = node->ComputeRaySide(*ri);
|
---|
1068 |
|
---|
1069 | if (side == 0) {
|
---|
1070 | if ((*ri).mRay->HasPosDir(axis)) {
|
---|
1071 | back->AddRay(*ri);
|
---|
1072 | front->AddRay(*ri);
|
---|
1073 | } else {
|
---|
1074 | back->AddRay(*ri);
|
---|
1075 | front->AddRay(*ri);
|
---|
1076 | }
|
---|
1077 | } else
|
---|
1078 | if (side == 1)
|
---|
1079 | front->AddRay(*ri);
|
---|
1080 | else
|
---|
1081 | back->AddRay(*ri);
|
---|
1082 | } else
|
---|
1083 | (*ri).mRay->Unref();
|
---|
1084 | }
|
---|
1085 | } else {
|
---|
1086 | // rays front/back
|
---|
1087 |
|
---|
1088 |
|
---|
1089 | for(RssTreeNode::RayInfoContainer::iterator ri = leaf->rays.begin();
|
---|
1090 | ri != leaf->rays.end();
|
---|
1091 | ri++) {
|
---|
1092 | if ((*ri).mRay->IsActive()) {
|
---|
1093 | // first unref ray from the former leaf
|
---|
1094 | (*ri).mRay->Unref();
|
---|
1095 |
|
---|
1096 | int side;
|
---|
1097 | if ((*ri).mRay->GetDirParametrization(axis - 3) <= position)
|
---|
1098 | side = -1;
|
---|
1099 | else
|
---|
1100 | side = 1;
|
---|
1101 |
|
---|
1102 | if (side == 1)
|
---|
1103 | front->AddRay(*ri);
|
---|
1104 | else
|
---|
1105 | back->AddRay(*ri);
|
---|
1106 |
|
---|
1107 | } else
|
---|
1108 | (*ri).mRay->Unref();
|
---|
1109 | }
|
---|
1110 | }
|
---|
1111 |
|
---|
1112 | #if 0
|
---|
1113 | front->SetPvsSize(pvsFront);
|
---|
1114 | back->SetPvsSize(pvsBack);
|
---|
1115 | // compute entropy as well
|
---|
1116 | front->ComputeEntropyImportance();
|
---|
1117 | back->ComputeEntropyImportance();
|
---|
1118 | #else
|
---|
1119 | front->UpdatePvsSize();
|
---|
1120 | back->UpdatePvsSize();
|
---|
1121 | #endif
|
---|
1122 |
|
---|
1123 |
|
---|
1124 | // update stats
|
---|
1125 | stat.rayRefs -= leaf->rays.size();
|
---|
1126 | stat.rayRefs += raysBack + raysFront;
|
---|
1127 |
|
---|
1128 |
|
---|
1129 | delete leaf;
|
---|
1130 | return node;
|
---|
1131 | }
|
---|
1132 |
|
---|
1133 |
|
---|
1134 |
|
---|
1135 |
|
---|
1136 |
|
---|
1137 |
|
---|
1138 | int
|
---|
1139 | RssTree::ReleaseMemory(const int time)
|
---|
1140 | {
|
---|
1141 | stack<RssTreeNode *> tstack;
|
---|
1142 |
|
---|
1143 | // find a node in the tree which subtree will be collapsed
|
---|
1144 | int maxAccessTime = time - accessTimeThreshold;
|
---|
1145 | int released;
|
---|
1146 |
|
---|
1147 | tstack.push(root);
|
---|
1148 |
|
---|
1149 | while (!tstack.empty()) {
|
---|
1150 | RssTreeNode *node = tstack.top();
|
---|
1151 | tstack.pop();
|
---|
1152 |
|
---|
1153 |
|
---|
1154 | if (!node->IsLeaf()) {
|
---|
1155 | RssTreeInterior *in = (RssTreeInterior *)node;
|
---|
1156 | // cout<<"depth="<<(int)in->depth<<" time="<<in->lastAccessTime<<endl;
|
---|
1157 | if (in->depth >= minCollapseDepth &&
|
---|
1158 | in->lastAccessTime <= maxAccessTime) {
|
---|
1159 | released = CollapseSubtree(node, time);
|
---|
1160 | break;
|
---|
1161 | }
|
---|
1162 |
|
---|
1163 | if (in->back->GetAccessTime() <
|
---|
1164 | in->front->GetAccessTime()) {
|
---|
1165 | tstack.push(in->front);
|
---|
1166 | tstack.push(in->back);
|
---|
1167 | } else {
|
---|
1168 | tstack.push(in->back);
|
---|
1169 | tstack.push(in->front);
|
---|
1170 | }
|
---|
1171 | }
|
---|
1172 | }
|
---|
1173 |
|
---|
1174 | while (tstack.empty()) {
|
---|
1175 | // could find node to collaps...
|
---|
1176 | // cout<<"Could not find a node to release "<<endl;
|
---|
1177 | break;
|
---|
1178 | }
|
---|
1179 |
|
---|
1180 | return released;
|
---|
1181 | }
|
---|
1182 |
|
---|
1183 |
|
---|
1184 |
|
---|
1185 |
|
---|
1186 | RssTreeNode *
|
---|
1187 | RssTree::SubdivideLeaf(
|
---|
1188 | RssTreeLeaf *leaf
|
---|
1189 | )
|
---|
1190 | {
|
---|
1191 | RssTreeNode *node = leaf;
|
---|
1192 |
|
---|
1193 | AxisAlignedBox3 leafBBox = GetBBox(leaf);
|
---|
1194 |
|
---|
1195 | static int pass = 0;
|
---|
1196 | pass ++;
|
---|
1197 |
|
---|
1198 | // check if we should perform a dynamic subdivision of the leaf
|
---|
1199 | if (!TerminationCriteriaSatisfied(leaf)) {
|
---|
1200 |
|
---|
1201 | // memory check and realese...
|
---|
1202 | if (GetMemUsage() > maxTotalMemory) {
|
---|
1203 | ReleaseMemory( pass );
|
---|
1204 | }
|
---|
1205 |
|
---|
1206 | AxisAlignedBox3 backBBox, frontBBox;
|
---|
1207 |
|
---|
1208 | // subdivide the node
|
---|
1209 | node =
|
---|
1210 | SubdivideNode(leaf,
|
---|
1211 | leafBBox,
|
---|
1212 | backBBox,
|
---|
1213 | frontBBox
|
---|
1214 | );
|
---|
1215 | }
|
---|
1216 |
|
---|
1217 | return node;
|
---|
1218 | }
|
---|
1219 |
|
---|
1220 |
|
---|
1221 |
|
---|
1222 | void
|
---|
1223 | RssTree::UpdateRays(VssRayContainer &remove,
|
---|
1224 | VssRayContainer &add
|
---|
1225 | )
|
---|
1226 | {
|
---|
1227 | RssTreeLeaf::NewMail();
|
---|
1228 |
|
---|
1229 | // schedule rays for removal
|
---|
1230 | for(VssRayContainer::const_iterator ri = remove.begin();
|
---|
1231 | ri != remove.end();
|
---|
1232 | ri++) {
|
---|
1233 | (*ri)->ScheduleForRemoval();
|
---|
1234 | }
|
---|
1235 |
|
---|
1236 | int inactive=0;
|
---|
1237 |
|
---|
1238 | for(VssRayContainer::const_iterator ri = remove.begin();
|
---|
1239 | ri != remove.end();
|
---|
1240 | ri++) {
|
---|
1241 | if ((*ri)->ScheduledForRemoval())
|
---|
1242 | // RemoveRay(*ri, NULL, false);
|
---|
1243 | // !!! BUG - with true it does not work correctly - aggreated delete
|
---|
1244 | RemoveRay(*ri, NULL, true);
|
---|
1245 | else
|
---|
1246 | inactive++;
|
---|
1247 | }
|
---|
1248 |
|
---|
1249 |
|
---|
1250 | // cout<<"all/inactive"<<remove.size()<<"/"<<inactive<<endl;
|
---|
1251 |
|
---|
1252 | for(VssRayContainer::const_iterator ri = add.begin();
|
---|
1253 | ri != add.end();
|
---|
1254 | ri++) {
|
---|
1255 | RssTreeNode::RayInfo info(*ri);
|
---|
1256 | if (mForcedBoundingBox==NULL || ClipRay(info, bbox))
|
---|
1257 | AddRay(info);
|
---|
1258 | }
|
---|
1259 | }
|
---|
1260 |
|
---|
1261 |
|
---|
1262 | void
|
---|
1263 | RssTree::RemoveRay(VssRay *ray,
|
---|
1264 | vector<RssTreeLeaf *> *affectedLeaves,
|
---|
1265 | const bool removeAllScheduledRays
|
---|
1266 | )
|
---|
1267 | {
|
---|
1268 |
|
---|
1269 | stack<RayTraversalData> tstack;
|
---|
1270 |
|
---|
1271 | tstack.push(RayTraversalData(root, RssTreeNode::RayInfo(ray)));
|
---|
1272 |
|
---|
1273 | RayTraversalData data;
|
---|
1274 |
|
---|
1275 | // cout<<"Number of ray refs = "<<ray->RefCount()<<endl;
|
---|
1276 |
|
---|
1277 | while (!tstack.empty()) {
|
---|
1278 | data = tstack.top();
|
---|
1279 | tstack.pop();
|
---|
1280 |
|
---|
1281 | if (!data.node->IsLeaf()) {
|
---|
1282 | // split the set of rays in two groups intersecting the
|
---|
1283 | // two subtrees
|
---|
1284 |
|
---|
1285 | TraverseInternalNode(data, tstack);
|
---|
1286 |
|
---|
1287 | } else {
|
---|
1288 | // remove the ray from the leaf
|
---|
1289 | // find the ray in the leaf and swap it with the last ray...
|
---|
1290 | RssTreeLeaf *leaf = (RssTreeLeaf *)data.node;
|
---|
1291 |
|
---|
1292 | if (!leaf->Mailed()) {
|
---|
1293 | leaf->Mail();
|
---|
1294 | if (affectedLeaves)
|
---|
1295 | affectedLeaves->push_back(leaf);
|
---|
1296 |
|
---|
1297 | if (removeAllScheduledRays) {
|
---|
1298 | int tail = leaf->rays.size()-1;
|
---|
1299 |
|
---|
1300 | for (int i=0; i < (int)(leaf->rays.size()); i++) {
|
---|
1301 | if (leaf->rays[i].mRay->ScheduledForRemoval()) {
|
---|
1302 | // find a ray to replace it with
|
---|
1303 | while (tail >= i && leaf->rays[tail].mRay->ScheduledForRemoval()) {
|
---|
1304 | stat.removedRayRefs++;
|
---|
1305 | leaf->rays[tail].mRay->Unref();
|
---|
1306 | leaf->rays.pop_back();
|
---|
1307 | tail--;
|
---|
1308 | }
|
---|
1309 |
|
---|
1310 | if (tail < i)
|
---|
1311 | break;
|
---|
1312 |
|
---|
1313 | stat.removedRayRefs++;
|
---|
1314 | leaf->rays[i].mRay->Unref();
|
---|
1315 | leaf->rays[i] = leaf->rays[tail];
|
---|
1316 | leaf->rays.pop_back();
|
---|
1317 | tail--;
|
---|
1318 | }
|
---|
1319 | }
|
---|
1320 | }
|
---|
1321 | }
|
---|
1322 |
|
---|
1323 | if (!removeAllScheduledRays)
|
---|
1324 | for (int i=0; i < (int)leaf->rays.size(); i++) {
|
---|
1325 | if (leaf->rays[i].mRay == ray) {
|
---|
1326 | stat.removedRayRefs++;
|
---|
1327 | ray->Unref();
|
---|
1328 | leaf->rays[i] = leaf->rays[leaf->rays.size()-1];
|
---|
1329 | leaf->rays.pop_back();
|
---|
1330 | // check this ray again
|
---|
1331 | break;
|
---|
1332 | }
|
---|
1333 | }
|
---|
1334 |
|
---|
1335 | }
|
---|
1336 | }
|
---|
1337 |
|
---|
1338 | if (ray->RefCount() != 0) {
|
---|
1339 | cerr<<"Error: Number of remaining refs = "<<ray->RefCount()<<endl;
|
---|
1340 | exit(1);
|
---|
1341 | }
|
---|
1342 |
|
---|
1343 | }
|
---|
1344 |
|
---|
1345 |
|
---|
1346 | void
|
---|
1347 | RssTree::AddRay(RssTreeNode::RayInfo &info)
|
---|
1348 | {
|
---|
1349 |
|
---|
1350 | stack<RayTraversalData> tstack;
|
---|
1351 |
|
---|
1352 | tstack.push(RayTraversalData(root, info));
|
---|
1353 |
|
---|
1354 | RayTraversalData data;
|
---|
1355 |
|
---|
1356 | while (!tstack.empty()) {
|
---|
1357 | data = tstack.top();
|
---|
1358 | tstack.pop();
|
---|
1359 |
|
---|
1360 | if (!data.node->IsLeaf()) {
|
---|
1361 | TraverseInternalNode(data, tstack);
|
---|
1362 | } else {
|
---|
1363 | // remove the ray from the leaf
|
---|
1364 | // find the ray in the leaf and swap it with the last ray...
|
---|
1365 | RssTreeLeaf *leaf = (RssTreeLeaf *)data.node;
|
---|
1366 | leaf->AddRay(data.rayData);
|
---|
1367 | stat.addedRayRefs++;
|
---|
1368 | }
|
---|
1369 | }
|
---|
1370 | }
|
---|
1371 |
|
---|
1372 | void
|
---|
1373 | RssTree::TraverseInternalNode(
|
---|
1374 | RayTraversalData &data,
|
---|
1375 | stack<RayTraversalData> &tstack)
|
---|
1376 | {
|
---|
1377 | RssTreeInterior *in = (RssTreeInterior *) data.node;
|
---|
1378 |
|
---|
1379 | if (in->axis <= RssTreeNode::SPLIT_Z) {
|
---|
1380 |
|
---|
1381 | // determine the side of this ray with respect to the plane
|
---|
1382 | int side = in->ComputeRaySide(data.rayData
|
---|
1383 | );
|
---|
1384 |
|
---|
1385 |
|
---|
1386 | if (side == 0) {
|
---|
1387 | if (data.rayData.mRay->HasPosDir(in->axis)) {
|
---|
1388 | tstack.push(RayTraversalData(in->back,
|
---|
1389 | data.rayData)
|
---|
1390 | );
|
---|
1391 |
|
---|
1392 | tstack.push(RayTraversalData(in->front,
|
---|
1393 | data.rayData)
|
---|
1394 | );
|
---|
1395 |
|
---|
1396 | } else {
|
---|
1397 | tstack.push(RayTraversalData(in->back,
|
---|
1398 | data.rayData
|
---|
1399 | )
|
---|
1400 | );
|
---|
1401 |
|
---|
1402 | tstack.push(RayTraversalData(in->front,
|
---|
1403 | data.rayData)
|
---|
1404 | );
|
---|
1405 |
|
---|
1406 |
|
---|
1407 | }
|
---|
1408 | } else
|
---|
1409 | if (side == 1)
|
---|
1410 | tstack.push(RayTraversalData(in->front, data.rayData));
|
---|
1411 | else
|
---|
1412 | tstack.push(RayTraversalData(in->back, data.rayData));
|
---|
1413 | }
|
---|
1414 | else {
|
---|
1415 | // directional split
|
---|
1416 | if (data.rayData.mRay->GetDirParametrization(in->axis - 3) <= in->position)
|
---|
1417 | tstack.push(RayTraversalData(in->back, data.rayData));
|
---|
1418 | else
|
---|
1419 | tstack.push(RayTraversalData(in->front, data.rayData));
|
---|
1420 | }
|
---|
1421 | }
|
---|
1422 |
|
---|
1423 |
|
---|
1424 | int
|
---|
1425 | RssTree::CollapseSubtree(RssTreeNode *sroot, const int time)
|
---|
1426 | {
|
---|
1427 | // first count all rays in the subtree
|
---|
1428 | // use mail 1 for this purpose
|
---|
1429 | stack<RssTreeNode *> tstack;
|
---|
1430 | int rayCount = 0;
|
---|
1431 | int totalRayCount = 0;
|
---|
1432 | int collapsedNodes = 0;
|
---|
1433 |
|
---|
1434 | #if DEBUG_COLLAPSE
|
---|
1435 | cout<<"Collapsing subtree"<<endl;
|
---|
1436 | cout<<"acessTime="<<sroot->GetAccessTime()<<endl;
|
---|
1437 | cout<<"depth="<<(int)sroot->depth<<endl;
|
---|
1438 | #endif
|
---|
1439 |
|
---|
1440 | // tstat.collapsedSubtrees++;
|
---|
1441 | // tstat.collapseDepths += (int)sroot->depth;
|
---|
1442 | // tstat.collapseAccessTimes += time - sroot->GetAccessTime();
|
---|
1443 |
|
---|
1444 | tstack.push(sroot);
|
---|
1445 | VssRay::NewMail();
|
---|
1446 |
|
---|
1447 | while (!tstack.empty()) {
|
---|
1448 | collapsedNodes++;
|
---|
1449 | RssTreeNode *node = tstack.top();
|
---|
1450 | tstack.pop();
|
---|
1451 |
|
---|
1452 | if (node->IsLeaf()) {
|
---|
1453 | RssTreeLeaf *leaf = (RssTreeLeaf *) node;
|
---|
1454 | for(RssTreeNode::RayInfoContainer::iterator ri = leaf->rays.begin();
|
---|
1455 | ri != leaf->rays.end();
|
---|
1456 | ri++) {
|
---|
1457 |
|
---|
1458 | totalRayCount++;
|
---|
1459 | if ((*ri).mRay->IsActive() && !(*ri).mRay->Mailed()) {
|
---|
1460 | (*ri).mRay->Mail();
|
---|
1461 | rayCount++;
|
---|
1462 | }
|
---|
1463 | }
|
---|
1464 | } else {
|
---|
1465 | tstack.push(((RssTreeInterior *)node)->back);
|
---|
1466 | tstack.push(((RssTreeInterior *)node)->front);
|
---|
1467 | }
|
---|
1468 | }
|
---|
1469 |
|
---|
1470 | VssRay::NewMail();
|
---|
1471 |
|
---|
1472 | // create a new node that will hold the rays
|
---|
1473 | RssTreeLeaf *newLeaf = new RssTreeLeaf( sroot->parent, rayCount );
|
---|
1474 | if ( newLeaf->parent )
|
---|
1475 | newLeaf->parent->ReplaceChildLink(sroot, newLeaf);
|
---|
1476 |
|
---|
1477 |
|
---|
1478 | tstack.push( sroot );
|
---|
1479 |
|
---|
1480 | while (!tstack.empty()) {
|
---|
1481 |
|
---|
1482 | RssTreeNode *node = tstack.top();
|
---|
1483 | tstack.pop();
|
---|
1484 |
|
---|
1485 | if (node->IsLeaf()) {
|
---|
1486 | RssTreeLeaf *leaf = (RssTreeLeaf *) node;
|
---|
1487 |
|
---|
1488 | for(RssTreeNode::RayInfoContainer::iterator ri = leaf->rays.begin();
|
---|
1489 | ri != leaf->rays.end();
|
---|
1490 | ri++) {
|
---|
1491 |
|
---|
1492 | // unref this ray from the old node
|
---|
1493 |
|
---|
1494 | if ((*ri).mRay->IsActive()) {
|
---|
1495 | (*ri).mRay->Unref();
|
---|
1496 | if (!(*ri).mRay->Mailed()) {
|
---|
1497 | (*ri).mRay->Mail();
|
---|
1498 | newLeaf->AddRay(*ri);
|
---|
1499 | }
|
---|
1500 | } else
|
---|
1501 | (*ri).mRay->Unref();
|
---|
1502 |
|
---|
1503 | }
|
---|
1504 | } else {
|
---|
1505 | tstack.push(((RssTreeInterior *)node)->back);
|
---|
1506 | tstack.push(((RssTreeInterior *)node)->front);
|
---|
1507 | }
|
---|
1508 | }
|
---|
1509 |
|
---|
1510 | // delete the node and all its children
|
---|
1511 | delete sroot;
|
---|
1512 |
|
---|
1513 | // for(RssTreeNode::SRayContainer::iterator ri = newLeaf->rays.begin();
|
---|
1514 | // ri != newLeaf->rays.end();
|
---|
1515 | // ri++)
|
---|
1516 | // (*ri).ray->UnMail(2);
|
---|
1517 |
|
---|
1518 |
|
---|
1519 | #if DEBUG_COLLAPSE
|
---|
1520 | cout<<"Total memory before="<<GetMemUsage()<<endl;
|
---|
1521 | #endif
|
---|
1522 |
|
---|
1523 | stat.nodes -= collapsedNodes - 1;
|
---|
1524 | stat.rayRefs -= totalRayCount - rayCount;
|
---|
1525 |
|
---|
1526 | #if DEBUG_COLLAPSE
|
---|
1527 | cout<<"collapsed nodes"<<collapsedNodes<<endl;
|
---|
1528 | cout<<"collapsed rays"<<totalRayCount - rayCount<<endl;
|
---|
1529 | cout<<"Total memory after="<<GetMemUsage()<<endl;
|
---|
1530 | cout<<"================================"<<endl;
|
---|
1531 | #endif
|
---|
1532 |
|
---|
1533 | // tstat.collapsedNodes += collapsedNodes;
|
---|
1534 | // tstat.collapsedRays += totalRayCount - rayCount;
|
---|
1535 |
|
---|
1536 | return totalRayCount - rayCount;
|
---|
1537 | }
|
---|
1538 |
|
---|
1539 |
|
---|
1540 | int
|
---|
1541 | RssTree::GetPvsSize(const AxisAlignedBox3 &box) const
|
---|
1542 | {
|
---|
1543 | stack<RssTreeNode *> tstack;
|
---|
1544 | tstack.push(root);
|
---|
1545 |
|
---|
1546 | Intersectable::NewMail();
|
---|
1547 | int pvsSize = 0;
|
---|
1548 |
|
---|
1549 | while (!tstack.empty()) {
|
---|
1550 | RssTreeNode *node = tstack.top();
|
---|
1551 | tstack.pop();
|
---|
1552 |
|
---|
1553 |
|
---|
1554 | if (node->IsLeaf()) {
|
---|
1555 | RssTreeLeaf *leaf = (RssTreeLeaf *)node;
|
---|
1556 | for(RssTreeNode::RayInfoContainer::iterator ri = leaf->rays.begin();
|
---|
1557 | ri != leaf->rays.end();
|
---|
1558 | ri++)
|
---|
1559 | if ((*ri).mRay->IsActive()) {
|
---|
1560 | Intersectable *object;
|
---|
1561 | #if BIDIRECTIONAL_RAY
|
---|
1562 | object = (*ri).mRay->mOriginObject;
|
---|
1563 | if (object && !object->Mailed()) {
|
---|
1564 | pvsSize++;
|
---|
1565 | object->Mail();
|
---|
1566 | }
|
---|
1567 | #endif
|
---|
1568 | object = (*ri).mRay->mTerminationObject;
|
---|
1569 | if (object && !object->Mailed()) {
|
---|
1570 | pvsSize++;
|
---|
1571 | object->Mail();
|
---|
1572 | }
|
---|
1573 | }
|
---|
1574 | } else {
|
---|
1575 | RssTreeInterior *in = (RssTreeInterior *)node;
|
---|
1576 | if (in->axis < 3) {
|
---|
1577 | if (box.Max(in->axis) >= in->position )
|
---|
1578 | tstack.push(in->front);
|
---|
1579 |
|
---|
1580 | if (box.Min(in->axis) <= in->position )
|
---|
1581 | tstack.push(in->back);
|
---|
1582 | } else {
|
---|
1583 | // both nodes for directional splits
|
---|
1584 | tstack.push(in->front);
|
---|
1585 | tstack.push(in->back);
|
---|
1586 | }
|
---|
1587 | }
|
---|
1588 | }
|
---|
1589 | return pvsSize;
|
---|
1590 | }
|
---|
1591 |
|
---|
1592 | int
|
---|
1593 | RssTree::CollectPvs(const AxisAlignedBox3 &box,
|
---|
1594 | ObjectContainer &pvs
|
---|
1595 | ) const
|
---|
1596 | {
|
---|
1597 | stack<RssTreeNode *> tstack;
|
---|
1598 | tstack.push(root);
|
---|
1599 |
|
---|
1600 | Intersectable::NewMail();
|
---|
1601 |
|
---|
1602 | while (!tstack.empty()) {
|
---|
1603 | RssTreeNode *node = tstack.top();
|
---|
1604 | tstack.pop();
|
---|
1605 |
|
---|
1606 |
|
---|
1607 | if (node->IsLeaf()) {
|
---|
1608 | RssTreeLeaf *leaf = (RssTreeLeaf *)node;
|
---|
1609 | for(RssTreeNode::RayInfoContainer::iterator ri = leaf->rays.begin();
|
---|
1610 | ri != leaf->rays.end();
|
---|
1611 | ri++)
|
---|
1612 | if ((*ri).mRay->IsActive()) {
|
---|
1613 | Intersectable *object;
|
---|
1614 | object = (*ri).mRay->mTerminationObject;
|
---|
1615 | if (object && !object->Mailed()) {
|
---|
1616 | pvs.push_back(object);
|
---|
1617 | object->Mail();
|
---|
1618 | }
|
---|
1619 | }
|
---|
1620 | } else {
|
---|
1621 | RssTreeInterior *in = (RssTreeInterior *)node;
|
---|
1622 | if (in->axis < 3) {
|
---|
1623 | if (box.Max(in->axis) >= in->position )
|
---|
1624 | tstack.push(in->front);
|
---|
1625 |
|
---|
1626 | if (box.Min(in->axis) <= in->position )
|
---|
1627 | tstack.push(in->back);
|
---|
1628 | } else {
|
---|
1629 | // both nodes for directional splits
|
---|
1630 | tstack.push(in->front);
|
---|
1631 | tstack.push(in->back);
|
---|
1632 | }
|
---|
1633 | }
|
---|
1634 | }
|
---|
1635 | return pvs.size();
|
---|
1636 | }
|
---|
1637 |
|
---|
1638 | void
|
---|
1639 | RssTree::GetTreeStatistics(
|
---|
1640 | float &avgPvsSize,
|
---|
1641 | float &avgRays,
|
---|
1642 | float &avgRayContribution,
|
---|
1643 | float &avgPvsEntropy,
|
---|
1644 | float &avgRayLengthEntropy,
|
---|
1645 | float &avgImportance
|
---|
1646 | )
|
---|
1647 | {
|
---|
1648 | stack<RssTreeNode *> tstack;
|
---|
1649 | tstack.push(root);
|
---|
1650 |
|
---|
1651 | float sumPvsSize = 0.0f;
|
---|
1652 | float sumRayContribution = 0.0f;
|
---|
1653 | float sumImportance = 0.0f;
|
---|
1654 | float sumPvsEntropy = 0.0f;
|
---|
1655 | float sumRayLengthEntropy = 0.0f;
|
---|
1656 | float sumRays = 0.0f;
|
---|
1657 |
|
---|
1658 | int leaves = 0;
|
---|
1659 |
|
---|
1660 | while (!tstack.empty()) {
|
---|
1661 | RssTreeNode *node = tstack.top();
|
---|
1662 | tstack.pop();
|
---|
1663 |
|
---|
1664 | if (node->IsLeaf()) {
|
---|
1665 | leaves++;
|
---|
1666 | RssTreeLeaf *leaf = (RssTreeLeaf *)node;
|
---|
1667 | leaf->UpdatePvsSize();
|
---|
1668 |
|
---|
1669 | sumPvsSize += leaf->GetPvsSize();
|
---|
1670 | sumRayContribution += leaf->GetAvgRayContribution();
|
---|
1671 | sumPvsEntropy += leaf->mPvsEntropy;
|
---|
1672 | sumRayLengthEntropy += leaf->mRayLengthEntropy;
|
---|
1673 | sumRays += leaf->rays.size();
|
---|
1674 |
|
---|
1675 | float imp = leaf->GetImportance();
|
---|
1676 |
|
---|
1677 | if (imp > 1.0f)
|
---|
1678 | cout<<"warning imp > 1.0f:"<<imp<<endl;
|
---|
1679 |
|
---|
1680 | sumImportance += imp;
|
---|
1681 |
|
---|
1682 |
|
---|
1683 | } else {
|
---|
1684 | RssTreeInterior *in = (RssTreeInterior *)node;
|
---|
1685 | // both nodes for directional splits
|
---|
1686 | tstack.push(in->front);
|
---|
1687 | tstack.push(in->back);
|
---|
1688 | }
|
---|
1689 | }
|
---|
1690 |
|
---|
1691 | avgPvsSize = sumPvsSize/(float)leaves;
|
---|
1692 | avgRays = sumRays/(float)leaves;
|
---|
1693 | avgRayContribution = sumRayContribution/(float)leaves;
|
---|
1694 | avgPvsEntropy = sumPvsEntropy/(float)leaves;
|
---|
1695 | avgRayLengthEntropy = sumRayLengthEntropy/(float)leaves;
|
---|
1696 | avgImportance = sumImportance/(float)leaves;
|
---|
1697 | }
|
---|
1698 |
|
---|
1699 |
|
---|
1700 | int
|
---|
1701 | RssTree::GenerateRays(const float ratioPerLeaf,
|
---|
1702 | SimpleRayContainer &rays)
|
---|
1703 | {
|
---|
1704 | stack<RssTreeNode *> tstack;
|
---|
1705 | tstack.push(root);
|
---|
1706 |
|
---|
1707 | while (!tstack.empty()) {
|
---|
1708 | RssTreeNode *node = tstack.top();
|
---|
1709 | tstack.pop();
|
---|
1710 |
|
---|
1711 | if (node->IsLeaf()) {
|
---|
1712 | RssTreeLeaf *leaf = (RssTreeLeaf *)node;
|
---|
1713 | float c = leaf->GetImportance();
|
---|
1714 | int num = (c*ratioPerLeaf + 0.5);
|
---|
1715 | // cout<<num<<" ";
|
---|
1716 |
|
---|
1717 | for (int i=0; i < num; i++) {
|
---|
1718 | Vector3 origin = GetBBox(leaf).GetRandomPoint();
|
---|
1719 | Vector3 dirVector = GetDirBBox(leaf).GetRandomPoint();
|
---|
1720 | Vector3 direction = VssRay::GetDirection(dirVector.x, dirVector.y);
|
---|
1721 | //cout<<"dir vector.x="<<dirVector.x<<"direction'.x="<<atan2(direction.x, direction.y)<<endl;
|
---|
1722 | rays.push_back(SimpleRay(origin, direction));
|
---|
1723 | }
|
---|
1724 |
|
---|
1725 | } else {
|
---|
1726 | RssTreeInterior *in = (RssTreeInterior *)node;
|
---|
1727 | // both nodes for directional splits
|
---|
1728 | tstack.push(in->front);
|
---|
1729 | tstack.push(in->back);
|
---|
1730 | }
|
---|
1731 | }
|
---|
1732 |
|
---|
1733 | return rays.size();
|
---|
1734 | }
|
---|
1735 |
|
---|
1736 | void
|
---|
1737 | RssTree::CollectLeaves(vector<RssTreeLeaf *> &leaves)
|
---|
1738 | {
|
---|
1739 | stack<RssTreeNode *> tstack;
|
---|
1740 | tstack.push(root);
|
---|
1741 |
|
---|
1742 | while (!tstack.empty()) {
|
---|
1743 | RssTreeNode *node = tstack.top();
|
---|
1744 | tstack.pop();
|
---|
1745 |
|
---|
1746 | if (node->IsLeaf()) {
|
---|
1747 | RssTreeLeaf *leaf = (RssTreeLeaf *)node;
|
---|
1748 | leaves.push_back(leaf);
|
---|
1749 | } else {
|
---|
1750 | RssTreeInterior *in = (RssTreeInterior *)node;
|
---|
1751 | // both nodes for directional splits
|
---|
1752 | tstack.push(in->front);
|
---|
1753 | tstack.push(in->back);
|
---|
1754 | }
|
---|
1755 | }
|
---|
1756 | }
|
---|
1757 |
|
---|
1758 | bool
|
---|
1759 | RssTree::ValidLeaf(RssTreeLeaf *leaf) const
|
---|
1760 | {
|
---|
1761 | return true;
|
---|
1762 | //return leaf->rays.size() > termMinRays/4;
|
---|
1763 | }
|
---|
1764 |
|
---|
1765 |
|
---|
1766 | void
|
---|
1767 | RssTree::PickEdgeRays(RssTreeLeaf *leaf,
|
---|
1768 | int &r1,
|
---|
1769 | int &r2
|
---|
1770 | )
|
---|
1771 | {
|
---|
1772 | int nrays = leaf->rays.size();
|
---|
1773 |
|
---|
1774 | if (nrays == 2) {
|
---|
1775 | r1 = 0;
|
---|
1776 | r2 = 1;
|
---|
1777 | return;
|
---|
1778 | }
|
---|
1779 |
|
---|
1780 | int tries = min(20, nrays);
|
---|
1781 |
|
---|
1782 | while (--tries) {
|
---|
1783 | r1 = Random(nrays);
|
---|
1784 | r2 = Random(nrays);
|
---|
1785 | if (leaf->rays[r1].mRay->mTerminationObject != leaf->rays[r2].mRay->mTerminationObject)
|
---|
1786 | break;
|
---|
1787 | }
|
---|
1788 |
|
---|
1789 | if (r1 == r2)
|
---|
1790 | r2 = (r1+1)%leaf->rays.size();
|
---|
1791 | }
|
---|
1792 |
|
---|
1793 |
|
---|
1794 | void
|
---|
1795 | RssTree::GenerateLeafRays(RssTreeLeaf *leaf,
|
---|
1796 | const int numberOfRays,
|
---|
1797 | SimpleRayContainer &rays)
|
---|
1798 | {
|
---|
1799 |
|
---|
1800 | int nrays = leaf->rays.size();
|
---|
1801 | for (int i=0; i < numberOfRays; i++) {
|
---|
1802 | bool useExtendedConvexCombination = (nrays >= 2) && (i > numberOfRays/2);
|
---|
1803 |
|
---|
1804 |
|
---|
1805 | Vector3 origin, direction;
|
---|
1806 | // generate half of convex combination and half of random rays
|
---|
1807 | if (useExtendedConvexCombination) {
|
---|
1808 | // pickup 3 random rays
|
---|
1809 | int r1, r2;
|
---|
1810 | PickEdgeRays(leaf, r1, r2);
|
---|
1811 |
|
---|
1812 | Vector3 o1 = leaf->rays[r1].GetOrigin();
|
---|
1813 | Vector3 o2 = leaf->rays[r2].GetOrigin();
|
---|
1814 |
|
---|
1815 | const float overlap = 0.1f;
|
---|
1816 | float w1, w2;
|
---|
1817 | GenerateExtendedConvexCombinationWeights2(w1, w2, overlap);
|
---|
1818 | origin = w1*o1 + w2*o2;
|
---|
1819 | direction =
|
---|
1820 | w1*leaf->rays[r1].mRay->GetDir() +
|
---|
1821 | w2*leaf->rays[r2].mRay->GetDir();
|
---|
1822 | // shift the origin a little bit
|
---|
1823 | origin += direction*0.1f;
|
---|
1824 | } else {
|
---|
1825 | origin = GetBBox(leaf).GetRandomPoint();
|
---|
1826 | Vector3 dirVector = GetDirBBox(leaf).GetRandomPoint();
|
---|
1827 | direction = Vector3(sin(dirVector.x), sin(dirVector.y), cos(dirVector.x));
|
---|
1828 | }
|
---|
1829 | //cout<<"dir vector.x="<<dirVector.x<<"direction'.x="<<atan2(direction.x, direction.y)<<endl;
|
---|
1830 | rays.push_back(SimpleRay(origin, direction));
|
---|
1831 | }
|
---|
1832 | }
|
---|
1833 |
|
---|
1834 | int
|
---|
1835 | RssTree::GenerateRays(const int numberOfRays,
|
---|
1836 | const int numberOfLeaves,
|
---|
1837 | SimpleRayContainer &rays)
|
---|
1838 | {
|
---|
1839 |
|
---|
1840 | vector<RssTreeLeaf *> leaves;
|
---|
1841 |
|
---|
1842 | CollectLeaves(leaves);
|
---|
1843 |
|
---|
1844 | sort(leaves.begin(),
|
---|
1845 | leaves.end(),
|
---|
1846 | GreaterContribution);
|
---|
1847 |
|
---|
1848 |
|
---|
1849 | float sumContrib = 0.0;
|
---|
1850 | int i;
|
---|
1851 | int k = 0;
|
---|
1852 | for (i=0; i < leaves.size() && k < numberOfLeaves; i++)
|
---|
1853 | if (ValidLeaf(leaves[i])) {
|
---|
1854 | float c = leaves[i]->GetImportance();
|
---|
1855 | sumContrib += c;
|
---|
1856 | // cout<<"ray contrib "<<i<<" : "<<c<<endl;
|
---|
1857 | k++;
|
---|
1858 | }
|
---|
1859 |
|
---|
1860 | float avgContrib = sumContrib/numberOfLeaves;
|
---|
1861 | float ratioPerLeaf = numberOfRays/(avgContrib*numberOfLeaves);
|
---|
1862 | k = 0;
|
---|
1863 | for (i=0; i < leaves.size() && k < numberOfLeaves; i++)
|
---|
1864 | if (ValidLeaf(leaves[i])) {
|
---|
1865 | k++;
|
---|
1866 | RssTreeLeaf *leaf = leaves[i];
|
---|
1867 | float c = leaf->GetImportance();
|
---|
1868 | int num = (c*ratioPerLeaf + 0.5);
|
---|
1869 | GenerateLeafRays(leaf, num, rays);
|
---|
1870 | }
|
---|
1871 |
|
---|
1872 | return rays.size();
|
---|
1873 | }
|
---|
1874 |
|
---|
1875 |
|
---|
1876 | float
|
---|
1877 | RssTree::GetAvgPvsSize()
|
---|
1878 | {
|
---|
1879 | stack<RssTreeNode *> tstack;
|
---|
1880 | tstack.push(root);
|
---|
1881 |
|
---|
1882 | int sumPvs = 0;
|
---|
1883 | int leaves = 0;
|
---|
1884 | while (!tstack.empty()) {
|
---|
1885 | RssTreeNode *node = tstack.top();
|
---|
1886 | tstack.pop();
|
---|
1887 |
|
---|
1888 | if (node->IsLeaf()) {
|
---|
1889 | RssTreeLeaf *leaf = (RssTreeLeaf *)node;
|
---|
1890 | // update pvs size
|
---|
1891 | leaf->UpdatePvsSize();
|
---|
1892 | sumPvs += leaf->GetPvsSize();
|
---|
1893 | leaves++;
|
---|
1894 | } else {
|
---|
1895 | RssTreeInterior *in = (RssTreeInterior *)node;
|
---|
1896 | // both nodes for directional splits
|
---|
1897 | tstack.push(in->front);
|
---|
1898 | tstack.push(in->back);
|
---|
1899 | }
|
---|
1900 | }
|
---|
1901 |
|
---|
1902 |
|
---|
1903 | return sumPvs/(float)leaves;
|
---|
1904 | }
|
---|
1905 |
|
---|
1906 |
|
---|
1907 | float
|
---|
1908 | RssTreeLeaf::GetImportance() const
|
---|
1909 | {
|
---|
1910 |
|
---|
1911 | if (1) {
|
---|
1912 | return GetAvgRayContribution();
|
---|
1913 | // return GetPvsSize();
|
---|
1914 | } else {
|
---|
1915 | // return GetAvgRayContribution()*mEntropyImportance;
|
---|
1916 | //return GetAvgRayContribution();
|
---|
1917 | return mEntropyImportance;
|
---|
1918 | }
|
---|
1919 | }
|
---|
1920 |
|
---|
1921 |
|
---|
1922 | float
|
---|
1923 | RssTreeLeaf::ComputePvsEntropy()
|
---|
1924 | {
|
---|
1925 | int samples = 0;
|
---|
1926 | Intersectable::NewMail();
|
---|
1927 | // set all object as belonging to the fron pvs
|
---|
1928 | for(RssTreeNode::RayInfoContainer::iterator ri = rays.begin();
|
---|
1929 | ri != rays.end();
|
---|
1930 | ri++)
|
---|
1931 | if ((*ri).mRay->IsActive()) {
|
---|
1932 | Intersectable *object = (*ri).mRay->mTerminationObject;
|
---|
1933 | if (object) {
|
---|
1934 | if (!object->Mailed()) {
|
---|
1935 | object->Mail();
|
---|
1936 | object->mCounter = 1;
|
---|
1937 | } else
|
---|
1938 | object->mCounter++;
|
---|
1939 | samples++;
|
---|
1940 | }
|
---|
1941 | }
|
---|
1942 |
|
---|
1943 | float entropy = 0.0f;
|
---|
1944 |
|
---|
1945 | if (samples > 1) {
|
---|
1946 | Intersectable::NewMail();
|
---|
1947 | for(RayInfoContainer::const_iterator ri = rays.begin();
|
---|
1948 | ri != rays.end();
|
---|
1949 | ri++)
|
---|
1950 | if ((*ri).mRay->IsActive()) {
|
---|
1951 | Intersectable *object = (*ri).mRay->mTerminationObject;
|
---|
1952 | if (object) {
|
---|
1953 | if (!object->Mailed()) {
|
---|
1954 | object->Mail();
|
---|
1955 | float p = object->mCounter/(float)samples;
|
---|
1956 | entropy -= p*log(p);
|
---|
1957 | }
|
---|
1958 | }
|
---|
1959 | }
|
---|
1960 | entropy = entropy/log((float)samples);
|
---|
1961 | }
|
---|
1962 | else
|
---|
1963 | entropy = 1.0f;
|
---|
1964 |
|
---|
1965 | return entropy;
|
---|
1966 | }
|
---|
1967 |
|
---|
1968 | float
|
---|
1969 | RssTreeLeaf::ComputeRayLengthEntropy()
|
---|
1970 | {
|
---|
1971 | // get sum of all ray lengths
|
---|
1972 | // consider only passing rays or originating rays
|
---|
1973 | float sum = 0.0f;
|
---|
1974 | int samples = 0;
|
---|
1975 | int i=0;
|
---|
1976 | for(RayInfoContainer::const_iterator ri = rays.begin();
|
---|
1977 | ri != rays.end();
|
---|
1978 | ri++)
|
---|
1979 | if ((*ri).mRay->IsActive()) {
|
---|
1980 | // float s;
|
---|
1981 | // if (i == 0)
|
---|
1982 | // s = 200;
|
---|
1983 | // else
|
---|
1984 | // s = 100;
|
---|
1985 | // i++;
|
---|
1986 |
|
---|
1987 | sum += (*ri).mRay->GetSize();
|
---|
1988 | samples++;
|
---|
1989 | }
|
---|
1990 |
|
---|
1991 |
|
---|
1992 | float entropy = 0.0f;
|
---|
1993 |
|
---|
1994 | if (samples > 1) {
|
---|
1995 | i = 0;
|
---|
1996 | for(RayInfoContainer::const_iterator ri = rays.begin();
|
---|
1997 | ri != rays.end();
|
---|
1998 | ri++)
|
---|
1999 | if ((*ri).mRay->IsActive()) {
|
---|
2000 | // float s;
|
---|
2001 | // if (i==0)
|
---|
2002 | // s = 200;
|
---|
2003 | // else
|
---|
2004 | // s = 100;
|
---|
2005 | // i++;
|
---|
2006 | // float p = s/sum;
|
---|
2007 | float p = (*ri).mRay->GetSize()/sum;
|
---|
2008 | entropy -= p*log(p);
|
---|
2009 | }
|
---|
2010 | entropy = entropy/log((float)samples);
|
---|
2011 | } else
|
---|
2012 | entropy = 1.0f;
|
---|
2013 |
|
---|
2014 | return entropy;
|
---|
2015 | }
|
---|
2016 |
|
---|
2017 |
|
---|
2018 |
|
---|
2019 | void
|
---|
2020 | RssTreeLeaf::ComputeEntropyImportance()
|
---|
2021 | {
|
---|
2022 | mPvsEntropy = ComputePvsEntropy();
|
---|
2023 | mRayLengthEntropy = ComputeRayLengthEntropy();
|
---|
2024 |
|
---|
2025 | // mEntropy = 1.0f - ComputeRayLengthEntropy();
|
---|
2026 | mEntropyImportance = 1.0f - ComputePvsEntropy();
|
---|
2027 |
|
---|
2028 | // cout<<"ei="<<mEntropyImportance<<" ";
|
---|
2029 | }
|
---|
2030 |
|
---|
2031 |
|
---|
2032 | AxisAlignedBox3
|
---|
2033 | RssTree::GetShrankedBBox(const RssTreeNode *node) const
|
---|
2034 | {
|
---|
2035 | if (node->parent == NULL)
|
---|
2036 | return bbox;
|
---|
2037 |
|
---|
2038 | if (!node->IsLeaf())
|
---|
2039 | return ((RssTreeInterior *)node)->bbox;
|
---|
2040 |
|
---|
2041 | // evaluate bounding box from the ray origins
|
---|
2042 | AxisAlignedBox3 box;
|
---|
2043 | box.Initialize();
|
---|
2044 | RssTreeLeaf *leaf = (RssTreeLeaf *)node;
|
---|
2045 | for(RssTreeNode::RayInfoContainer::iterator ri = leaf->rays.begin();
|
---|
2046 | ri != leaf->rays.end();
|
---|
2047 | ri++)
|
---|
2048 | if ((*ri).mRay->IsActive()) {
|
---|
2049 | box.Include((*ri).GetOrigin());
|
---|
2050 | }
|
---|
2051 | return box;
|
---|
2052 | }
|
---|
2053 |
|
---|
2054 |
|
---|
2055 | int
|
---|
2056 | RssTree::CollectRays(VssRayContainer &rays,
|
---|
2057 | const int number)
|
---|
2058 | {
|
---|
2059 | VssRayContainer allRays;
|
---|
2060 | CollectRays(allRays);
|
---|
2061 |
|
---|
2062 | int desired = min(number, (int)allRays.size());
|
---|
2063 | float prob = desired/(float)allRays.size();
|
---|
2064 | while (rays.size() < desired) {
|
---|
2065 | VssRayContainer::const_iterator it = allRays.begin();
|
---|
2066 | for (; it != allRays.end() && rays.size() < desired; it++) {
|
---|
2067 | if (Random(1.0f) < prob)
|
---|
2068 | rays.push_back(*it);
|
---|
2069 | }
|
---|
2070 | }
|
---|
2071 | return rays.size();
|
---|
2072 | }
|
---|
2073 |
|
---|
2074 |
|
---|
2075 | int
|
---|
2076 | RssTree::CollectRays(VssRayContainer &rays
|
---|
2077 | )
|
---|
2078 | {
|
---|
2079 | VssRay::NewMail();
|
---|
2080 |
|
---|
2081 | stack<RssTreeNode *> tstack;
|
---|
2082 | tstack.push(root);
|
---|
2083 |
|
---|
2084 | while (!tstack.empty()) {
|
---|
2085 | RssTreeNode *node = tstack.top();
|
---|
2086 | tstack.pop();
|
---|
2087 |
|
---|
2088 | if (node->IsLeaf()) {
|
---|
2089 | RssTreeLeaf *leaf = (RssTreeLeaf *)node;
|
---|
2090 | // update pvs size
|
---|
2091 | RssTreeNode::RayInfoContainer::const_iterator it = leaf->rays.begin();
|
---|
2092 | for (;it != leaf->rays.end(); ++it)
|
---|
2093 | if (!(*it).mRay->Mailed()) {
|
---|
2094 | (*it).mRay->Mail();
|
---|
2095 | rays.push_back((*it).mRay);
|
---|
2096 | }
|
---|
2097 | } else {
|
---|
2098 | RssTreeInterior *in = (RssTreeInterior *)node;
|
---|
2099 | // both nodes for directional splits
|
---|
2100 | tstack.push(in->front);
|
---|
2101 | tstack.push(in->back);
|
---|
2102 | }
|
---|
2103 | }
|
---|
2104 |
|
---|
2105 | return rays.size();
|
---|
2106 | }
|
---|