1 | #include <stack>
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2 | #include <time.h>
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3 | #include <iomanip>
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4 |
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5 | #include "ViewCell.h"
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6 | #include "Plane3.h"
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7 | #include "HierarchyManager.h"
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8 | #include "Mesh.h"
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9 | #include "common.h"
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10 | #include "Environment.h"
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11 | #include "Polygon3.h"
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12 | #include "Ray.h"
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13 | #include "AxisAlignedBox3.h"
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14 | #include "Exporter.h"
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15 | #include "Plane3.h"
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16 | #include "ViewCellsManager.h"
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17 | #include "Beam.h"
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18 | #include "KdTree.h"
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19 | #include "KdIntersectable.h"
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20 | #include "VspTree.h"
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21 | #include "OspTree.h"
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22 | #include "BvHierarchy.h"
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23 |
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24 |
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25 | namespace GtpVisibilityPreprocessor {
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26 |
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27 |
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28 | #define USE_FIXEDPOINT_T 0
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29 |
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30 |
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31 | /*******************************************************************/
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32 | /* class HierarchyManager implementation */
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33 | /*******************************************************************/
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34 |
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35 |
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36 | HierarchyManager::HierarchyManager(VspTree *vspTree,
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37 | const int objectSpaceSubdivisionType):
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38 | mObjectSpaceSubdivisionType(objectSpaceSubdivisionType),
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39 | mVspTree(vspTree),
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40 | mOspTree(NULL),
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41 | mBvHierarchy(NULL)
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42 | {
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43 | switch(mObjectSpaceSubdivisionType)
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44 | {
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45 | case KD_BASED_OBJ_SUBDIV:
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46 | mOspTree = new OspTree();
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47 | mOspTree->mVspTree = mVspTree;
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48 | //mOspTree->mHierarchyManager = this;
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49 | Debug << "creating osp tree" << endl;
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50 | break;
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51 | case BV_BASED_OBJ_SUBDIV:
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52 | mBvHierarchy = new BvHierarchy();
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53 | mBvHierarchy->mVspTree = mVspTree;
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54 | //mBvHierarchy->mHierarchyManager = this;
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55 | Debug << "creating bv hierachy" << endl;
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56 | break;
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57 | default:
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58 | break;
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59 | }
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60 |
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61 | if (mVspTree)
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62 | mVspTree->mHierarchyManager = this;
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63 |
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64 | ParseEnvironment();
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65 | }
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66 |
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67 |
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68 | HierarchyManager::HierarchyManager(VspTree *vspTree, KdTree *kdTree):
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69 | mObjectSpaceSubdivisionType(KD_BASED_OBJ_SUBDIV),
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70 | mVspTree(vspTree),
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71 | mBvHierarchy(NULL)
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72 | {
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73 | mOspTree = new OspTree(*kdTree);
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74 | mOspTree->mVspTree = mVspTree;
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75 |
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76 | //mOspTree->mHierarchyManager = this;
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77 | Debug << "creating osp tree" << endl;
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78 |
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79 | if (mVspTree)
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80 | mVspTree->mHierarchyManager = this;
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81 |
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82 | ParseEnvironment();
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83 | }
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84 |
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85 |
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86 | void HierarchyManager::ParseEnvironment()
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87 | {
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88 | char subdivisionStatsLog[100];
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89 | Environment::GetSingleton()->GetStringValue("Hierarchy.subdivisionStats",
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90 | subdivisionStatsLog);
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91 | mSubdivisionStats.open(subdivisionStatsLog);
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92 |
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93 | Environment::GetSingleton()->GetFloatValue(
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94 | "Hierarchy.Termination.minGlobalCostRatio", mTermMinGlobalCostRatio);
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95 | Environment::GetSingleton()->GetIntValue(
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96 | "Hierarchy.Termination.globalCostMissTolerance", mTermGlobalCostMissTolerance);
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97 |
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98 | Environment::GetSingleton()->GetIntValue(
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99 | "Hierarchy.Termination.maxLeaves", mTermMaxLeaves);
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100 |
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101 | Environment::GetSingleton()->GetIntValue(
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102 | "Hierarchy.Construction.type", mConstructionType);
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103 |
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104 | mMinDepthForObjectSpaceSubdivion = -1;
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105 |
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106 | Debug << "******** Hierachy Manager Parameters ***********" << endl;
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107 | Debug << "max leaves: " << mTermMaxLeaves << endl;
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108 | Debug << "min global cost ratio: " << mTermMinGlobalCostRatio << endl;
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109 | Debug << "global cost miss tolerance: " << mTermGlobalCostMissTolerance << endl;
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110 | }
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111 |
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112 |
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113 | HierarchyManager::~HierarchyManager()
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114 | {
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115 | DEL_PTR(mOspTree);
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116 | //DEL_PTR(mVspTree);
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117 | DEL_PTR(mBvHierarchy);
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118 | }
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119 |
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120 |
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121 | void HierarchyManager::SetViewCellsManager(ViewCellsManager *vcm)
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122 | {
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123 | mVspTree->SetViewCellsManager(vcm);
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124 |
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125 | if (mOspTree)
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126 | mOspTree->SetViewCellsManager(vcm);
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127 | if (mBvHierarchy)
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128 | mBvHierarchy->SetViewCellsManager(vcm);
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129 | }
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130 |
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131 |
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132 | void HierarchyManager::SetViewCellsTree(ViewCellsTree *vcTree)
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133 | {
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134 | mVspTree->SetViewCellsTree(vcTree);
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135 | }
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136 |
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137 |
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138 | SubdivisionCandidate *HierarchyManager::NextSubdivisionCandidate()
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139 | {
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140 | SubdivisionCandidate *splitCandidate = mTQueue.Top();
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141 | mTQueue.Pop();
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142 |
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143 | return splitCandidate;
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144 | }
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145 |
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146 |
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147 | void HierarchyManager::EvalSubdivisionStats(const SubdivisionCandidate &tData)
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148 | {
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149 | const float costDecr = tData.GetRenderCostDecrease();
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150 |
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151 | switch (mObjectSpaceSubdivisionType)
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152 | {
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153 | case KD_BASED_OBJ_SUBDIV:
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154 | AddSubdivisionStats(mOspTree->mOspStats.Leaves() + mVspTree->mVspStats.Leaves(),
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155 | costDecr,
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156 | mTotalCost
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157 | );
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158 | break;
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159 | case BV_BASED_OBJ_SUBDIV:
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160 | AddSubdivisionStats(mBvHierarchy->mBvhStats.Leaves() + mVspTree->mVspStats.Leaves(),
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161 | costDecr,
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162 | mTotalCost
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163 | );
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164 | break;
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165 | default:
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166 | AddSubdivisionStats(mVspTree->mVspStats.Leaves(),
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167 | costDecr,
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168 | mTotalCost
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169 | );
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170 | break;
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171 | }
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172 | }
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173 |
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174 |
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175 | void HierarchyManager::AddSubdivisionStats(const int splits,
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176 | const float renderCostDecr,
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177 | const float totalRenderCost)
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178 | {
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179 | mSubdivisionStats
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180 | << "#Splits\n" << splits << endl
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181 | << "#RenderCostDecrease\n" << renderCostDecr << endl
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182 | << "#TotalRenderCost\n" << totalRenderCost << endl;
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183 | //<< "#AvgRenderCost\n" << avgRenderCost << endl;
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184 | }
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185 |
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186 |
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187 | bool HierarchyManager::GlobalTerminationCriteriaMet(SubdivisionCandidate *candidate) const
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188 | {
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189 | return (0
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190 | || (mHierarchyStats.Leaves() >= mTermMaxLeaves)
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191 | //|| (mGlobalCostMisses >= mTermGlobalCostMissTolerance)
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192 | || candidate->GlobalTerminationCriteriaMet()
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193 | );
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194 | }
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195 |
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196 |
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197 | void HierarchyManager::Construct(const VssRayContainer &sampleRays,
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198 | const ObjectContainer &objects,
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199 | AxisAlignedBox3 *forcedViewSpace)
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200 | {
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201 |
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202 | RayInfoContainer *viewSpaceRays = new RayInfoContainer();
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203 |
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204 | mHierarchyStats.Reset();
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205 | mHierarchyStats.Start();
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206 |
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207 | // start with view space subdivison: prepare vsp tree for traversal
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208 | SubdivisionCandidate *vsc =
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209 | mVspTree->PrepareConstruction(sampleRays, forcedViewSpace, *viewSpaceRays);
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210 | mTQueue.Push(vsc);
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211 |
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212 | mTotalCost = (float)objects.size();
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213 | Debug << "setting total cost to " << mTotalCost << endl;
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214 |
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215 | const long startTime = GetTime();
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216 | cout << "Constructing view space / object space tree ... \n";
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217 |
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218 | // process object space candidates
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219 | RunConstruction();
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220 |
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221 | cout << "finished in " << TimeDiff(startTime, GetTime()) * 1e-3 << " secs" << endl;
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222 | mVspTree->mVspStats.Stop();
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223 | }
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224 |
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225 |
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226 | void HierarchyManager::PrepareObjectSpaceSubdivision(const VssRayContainer &sampleRays,
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227 | const ObjectContainer &objects)
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228 | {
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229 | if (mObjectSpaceSubdivisionType == KD_BASED_OBJ_SUBDIV)
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230 | {
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231 | PrepareOspTree(sampleRays, objects);
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232 | }
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233 | else if (mObjectSpaceSubdivisionType == BV_BASED_OBJ_SUBDIV)
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234 | {
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235 | PrepareBvHierarchy(sampleRays, objects);
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236 | }
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237 | }
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238 |
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239 |
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240 | void HierarchyManager::PrepareBvHierarchy(const VssRayContainer &sampleRays,
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241 | const ObjectContainer &objects)
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242 |
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243 | {
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244 | cout << "starting bv hierarchy construction ... " << endl;
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245 |
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246 | mBvHierarchy->CreateRoot(objects);
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247 |
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248 | // compute first candidate
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249 | SubdivisionCandidate *sc =
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250 | mBvHierarchy->PrepareConstruction(sampleRays, objects);
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251 |
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252 | mTotalCost = mBvHierarchy->mTotalCost;
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253 | Debug << "reseting cost, new total cost: " << mTotalCost << endl;
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254 |
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255 | mTQueue.Push(sc);
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256 | }
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257 |
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258 |
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259 | void HierarchyManager::PrepareOspTree(const VssRayContainer &sampleRays,
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260 | const ObjectContainer &objects)
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261 | {
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262 | RayInfoContainer *objectSpaceRays = new RayInfoContainer();
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263 |
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264 | cout << "starting osp tree construction ... " << endl;
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265 |
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266 | // start with one big kd cell - all objects can be seen from everywhere
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267 | // note: only true for view space = object space
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268 |
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269 | // compute first candidate
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270 | SubdivisionCandidate *osc =
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271 | mOspTree->PrepareConstruction(sampleRays, objects, *objectSpaceRays);
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272 |
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273 | mTotalCost = mOspTree->mTotalCost;
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274 | Debug << "reseting cost, new total cost: " << mTotalCost << endl;
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275 |
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276 | mTQueue.Push(osc);
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277 | }
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278 |
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279 |
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280 | bool HierarchyManager::ApplySubdivisionCandidate(SubdivisionCandidate *sc)
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281 | {
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282 | const bool globalTerminationCriteriaMet = GlobalTerminationCriteriaMet(sc);
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283 | const bool vspSplit = (sc->Type() == SubdivisionCandidate::VIEW_SPACE);
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284 |
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285 | if (vspSplit)
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286 | {
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287 | VspNode *n = mVspTree->Subdivide(mTQueue, sc, globalTerminationCriteriaMet);
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288 |
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289 | if (n->IsLeaf()) // local or global termination criteria failed
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290 | return false;
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291 | }
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292 | else
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293 | {
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294 | if (mObjectSpaceSubdivisionType == KD_BASED_OBJ_SUBDIV)
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295 | {
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296 | KdNode *n = mOspTree->Subdivide(mTQueue, sc, globalTerminationCriteriaMet);
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297 |
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298 | if (n->IsLeaf()) // local or global termination criteria failed
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299 | return false;
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300 | }
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301 | else if (mObjectSpaceSubdivisionType == BV_BASED_OBJ_SUBDIV)
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302 | {
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303 | BvhNode *n = mBvHierarchy->Subdivide(mTQueue, sc, globalTerminationCriteriaMet);
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304 |
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305 | if (n->IsLeaf()) // local or global termination criteria failed
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306 | return false;
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307 | }
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308 | }
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309 | return true;//!globalTerminationCriteriaMet;
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310 | }
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311 |
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312 |
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313 | bool HierarchyManager::StartObjectSpaceSubdivision() const
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314 | {
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315 | const bool constructAfterViewSpace = (mConstructionType == 1) && mTQueue.Empty();
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316 |
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317 | return
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318 | NO_OBJ_SUBDIV &&
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319 | ((mMinDepthForObjectSpaceSubdivion < 0/*mVspTree->mVspStats.mMaxDepth*/) || constructAfterViewSpace);
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320 | }
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321 |
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322 |
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323 | void HierarchyManager::RunConstruction()
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324 | {
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325 | mHierarchyStats.nodes = 0;
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326 | mGlobalCostMisses = 0;
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327 |
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328 | // use objects for evaluating vsp tree construction
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329 | const int savedObjectSpaceSubdivisionType = mObjectSpaceSubdivisionType;
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330 | mObjectSpaceSubdivisionType = NO_OBJ_SUBDIV;
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331 |
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332 | //const bool repairQueue = false;
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333 | const bool repairQueue = true;
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334 |
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335 | do
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336 | {
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337 | // use objects for evaluating vsp tree construction until a certain depth
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338 | if (StartObjectSpaceSubdivision())
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339 | {
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340 | mObjectSpaceSubdivisionType = savedObjectSpaceSubdivisionType;
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341 | //PrepareObjectSpaceSubdivision();
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342 | }
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343 |
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344 | mCurrentCandidate = NextSubdivisionCandidate();
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345 | mTotalCost -= mCurrentCandidate->GetRenderCostDecrease();
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346 |
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347 | // cost ratio of cost decrease / totalCost
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348 | const float costRatio = mCurrentCandidate->GetRenderCostDecrease() / mTotalCost;
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349 |
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350 | //Debug << "ratio: " << costRatio << " min ratio: " << mTermMinGlobalCostRatio << endl;
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351 | if (costRatio < mTermMinGlobalCostRatio)
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352 | {
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353 | ++ mGlobalCostMisses;
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354 | }
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355 |
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356 | //-- subdivide leaf node
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357 | if (ApplySubdivisionCandidate(mCurrentCandidate))
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358 | {
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359 | mHierarchyStats.nodes += 2;
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360 |
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361 | // subdivision successful
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362 | EvalSubdivisionStats(*mCurrentCandidate);
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363 |
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364 | // reevaluate candidates affected by the split for view space splits,
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365 | // this would be object space splits and other way round
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366 | if (repairQueue) RepairQueue();
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367 | }
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368 | DEL_PTR(mCurrentCandidate);
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369 | }
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370 | while (!FinishedConstruction());
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371 |
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372 | mObjectSpaceSubdivisionType = savedObjectSpaceSubdivisionType;
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373 | }
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374 |
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375 |
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376 | bool HierarchyManager::FinishedConstruction() const
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377 | {
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378 | return mTQueue.Empty();
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379 | }
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380 |
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381 |
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382 | void HierarchyManager::CollectObjectSpaceDirtyList(SubdivisionCandidateContainer &dirtyList)
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383 | {
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384 | switch (mObjectSpaceSubdivisionType)
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385 | {
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386 | case KD_BASED_OBJ_SUBDIV:
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387 | {
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388 | OspTree::OspSubdivisionCandidate *sc =
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389 | dynamic_cast<OspTree::OspSubdivisionCandidate *>(mCurrentCandidate);
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390 |
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391 | mOspTree->CollectDirtyCandidates(sc, dirtyList);
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392 | break;
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393 | }
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394 | case BV_BASED_OBJ_SUBDIV:
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395 | {
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396 | BvHierarchy::BvhSubdivisionCandidate *sc =
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397 | dynamic_cast<BvHierarchy::BvhSubdivisionCandidate *>(mCurrentCandidate);
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398 |
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399 | mBvHierarchy->CollectDirtyCandidates(sc, dirtyList);
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400 | break;
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401 | }
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402 | default:
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403 | break;
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404 | }
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405 | }
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406 |
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407 |
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408 | void HierarchyManager::CollectViewSpaceDirtyList(SubdivisionCandidateContainer &dirtyList)
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409 | {
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410 | VspTree::VspSubdivisionCandidate *sc =
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411 | dynamic_cast<VspTree::VspSubdivisionCandidate *>(mCurrentCandidate);
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412 |
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413 | mVspTree->CollectDirtyCandidates(sc, dirtyList);
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414 | }
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415 |
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416 |
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417 | void HierarchyManager::CollectDirtyCandidates(SubdivisionCandidateContainer &dirtyList)
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418 | {
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419 | // we have either a object space or view space split
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420 | if (mCurrentCandidate->Type() == SubdivisionCandidate::VIEW_SPACE)
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421 | {
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422 | CollectViewSpaceDirtyList(dirtyList);
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423 | }
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424 | else // object space split
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425 | {
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426 | CollectObjectSpaceDirtyList(dirtyList);
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427 | }
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428 | }
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429 |
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430 |
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431 | void HierarchyManager::RepairQueue()
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432 | {
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433 | // for each update of the view space partition:
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434 | // the candidates from object space partition which
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435 | // have been afected by the view space split (the kd split candidates
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436 | // which saw the view cell which was split) must be reevaluated
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437 | // (maybe not locally, just reinsert them into the queue)
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438 | //
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439 | // vice versa for the view cells
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440 | // for each update of the object space partition
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441 | // reevaluate split candidate for view cells which saw the split kd cell
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442 | //
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443 | // the priority queue update can be solved by implementing a binary heap
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444 | // (explicit data structure, binary tree)
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445 | // *) inserting and removal is efficient
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446 | // *) search is not efficient => store queue position with each
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447 | // split candidate
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448 |
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449 | // collect list of "dirty" candidates
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450 | vector<SubdivisionCandidate *> dirtyList;
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451 | CollectDirtyCandidates(dirtyList);
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452 | Debug << "collected " << (int)dirtyList.size() << " candidates for reevaluation" << endl;
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453 |
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454 | //-- reevaluate the dirty list
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455 | vector<SubdivisionCandidate *>::const_iterator sit, sit_end = dirtyList.end();
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456 |
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457 | for (sit = dirtyList.begin(); sit != sit_end; ++ sit)
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458 | {
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459 | SubdivisionCandidate* sc = *sit;
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460 | const float rcd = sc->GetRenderCostDecrease();
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461 |
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462 | mTQueue.Erase(sc); // erase from queue
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463 | sc->EvalPriority(); // reevaluate
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464 |
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465 | /*
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466 | Debug << "candidate " << sc << " reevaluated\n"
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467 | << "render cost decrease diff " << rcd - sc->GetRenderCostDecrease()
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468 | << " old: " << rcd << " new " << sc->GetRenderCostDecrease() << endl;*/
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469 | if (0)
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470 | {
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471 | const float rcDiff = rcd - sc->GetRenderCostDecrease();
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472 | mTotalCost += rcDiff;
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473 | }
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474 | mTQueue.Push(sc); // reinsert
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475 | }
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476 | }
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477 |
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478 |
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479 | void HierarchyManager::ExportObjectSpaceHierarchy(OUT_STREAM &stream)
|
---|
480 | {
|
---|
481 | // the type of the view cells hierarchy
|
---|
482 | switch (mObjectSpaceSubdivisionType)
|
---|
483 | {
|
---|
484 | case KD_BASED_OBJ_SUBDIV:
|
---|
485 | stream << "<ObjectSpaceHierarchy type=\"osp\">" << endl;
|
---|
486 | mOspTree->Export(stream);
|
---|
487 | stream << endl << "</ObjectSpaceHierarchy>" << endl;
|
---|
488 | break;
|
---|
489 | case BV_BASED_OBJ_SUBDIV:
|
---|
490 | stream << "<ObjectSpaceHierarchy type=\"bvh\">" << endl;
|
---|
491 | mBvHierarchy->Export(stream);
|
---|
492 | stream << endl << "</ObjectSpaceHierarchy>" << endl;
|
---|
493 | break;
|
---|
494 | }
|
---|
495 | }
|
---|
496 |
|
---|
497 |
|
---|
498 | bool HierarchyManager::AddSampleToPvs(Intersectable *obj,
|
---|
499 | const Vector3 &hitPoint,
|
---|
500 | ViewCell *vc,
|
---|
501 | const float pdf,
|
---|
502 | float &contribution) const
|
---|
503 | {
|
---|
504 | if (!obj) return false;
|
---|
505 |
|
---|
506 | switch (mObjectSpaceSubdivisionType)
|
---|
507 | {
|
---|
508 | case NO_OBJ_SUBDIV:
|
---|
509 | // potentially visible objects
|
---|
510 | return vc->AddPvsSample(obj, pdf, contribution);
|
---|
511 | case KD_BASED_OBJ_SUBDIV:
|
---|
512 | {
|
---|
513 | // potentially visible kd cells
|
---|
514 | KdLeaf *leaf = mOspTree->GetLeaf(hitPoint/*ray->mOriginNode*/);
|
---|
515 | return mOspTree->AddLeafToPvs(leaf, vc, pdf, contribution);
|
---|
516 | }
|
---|
517 | case BV_BASED_OBJ_SUBDIV:
|
---|
518 | {
|
---|
519 | BvhLeaf *leaf = mBvHierarchy->GetLeaf(obj);
|
---|
520 | return mBvHierarchy->AddLeafToPvs(leaf, vc, pdf, contribution);
|
---|
521 | }
|
---|
522 | default:
|
---|
523 | return false;
|
---|
524 | }
|
---|
525 | }
|
---|
526 |
|
---|
527 |
|
---|
528 | void HierarchyManager::PrintObjectSpaceHierarchyStatistics(ofstream &stream) const
|
---|
529 | {
|
---|
530 | switch (mObjectSpaceSubdivisionType)
|
---|
531 | {
|
---|
532 | case KD_BASED_OBJ_SUBDIV:
|
---|
533 | {
|
---|
534 | stream << mOspTree->GetStatistics();
|
---|
535 | break;
|
---|
536 | }
|
---|
537 | case BV_BASED_OBJ_SUBDIV:
|
---|
538 | {
|
---|
539 | stream << mBvHierarchy->GetStatistics();
|
---|
540 | break;
|
---|
541 | }
|
---|
542 | default:
|
---|
543 | break;
|
---|
544 | }
|
---|
545 | }
|
---|
546 |
|
---|
547 |
|
---|
548 | void HierarchyManager::ExportObjectSpaceHierarchy(Exporter *exporter,
|
---|
549 | const ObjectContainer &objects) const
|
---|
550 | {
|
---|
551 | switch (mObjectSpaceSubdivisionType)
|
---|
552 | {
|
---|
553 | case KD_BASED_OBJ_SUBDIV:
|
---|
554 | {
|
---|
555 | ExportOspTree(exporter, objects);
|
---|
556 | break;
|
---|
557 | }
|
---|
558 | case BV_BASED_OBJ_SUBDIV:
|
---|
559 | {
|
---|
560 | ExportBvHierarchy(exporter, objects);
|
---|
561 | break;
|
---|
562 | }
|
---|
563 | default:
|
---|
564 | break;
|
---|
565 | }
|
---|
566 | }
|
---|
567 |
|
---|
568 |
|
---|
569 | void HierarchyManager::ExportBvHierarchy(Exporter *exporter,
|
---|
570 | const ObjectContainer &objects) const
|
---|
571 | {
|
---|
572 | exporter->SetWireframe();
|
---|
573 | exporter->ExportBvHierarchy(*mBvHierarchy, 0);
|
---|
574 | }
|
---|
575 |
|
---|
576 |
|
---|
577 | void HierarchyManager::ExportOspTree(Exporter *exporter,
|
---|
578 | const ObjectContainer &objects) const
|
---|
579 | {
|
---|
580 | if (0) exporter->ExportGeometry(objects);
|
---|
581 |
|
---|
582 | exporter->SetWireframe();
|
---|
583 | exporter->ExportOspTree(*mOspTree, 0);
|
---|
584 | }
|
---|
585 |
|
---|
586 |
|
---|
587 | } |
---|