1 | #ifndef _HierarchyManager_H__
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2 | #define _HierarchyManager_H__
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3 |
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4 | #include <stack>
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5 |
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6 | #include "Mesh.h"
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7 | #include "Containers.h"
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8 | #include "Statistics.h"
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9 | #include "VssRay.h"
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10 | #include "RayInfo.h"
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11 | #include "gzstream.h"
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12 | #include "SubdivisionCandidate.h"
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13 |
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14 |
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15 |
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16 | namespace GtpVisibilityPreprocessor {
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17 |
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18 | class ViewCellLeaf;
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19 | class OspTree;
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20 | class VspTree;
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21 | class Plane3;
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22 | class AxisAlignedBox3;
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23 | class Ray;
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24 | class ViewCellsStatistics;
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25 | class ViewCellsManager;
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26 | class MergeCandidate;
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27 | class Beam;
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28 | class ViewCellsTree;
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29 | class Environment;
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30 | class VspInterior;
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31 | class VspLeaf;
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32 | class VspNode;
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33 | class KdNode;
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34 | class KdInterior;
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35 | class KdLeaf;
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36 | class OspTree;
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37 | class KdIntersectable;
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38 | class KdTree;
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39 | class VspTree;
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40 | class KdTreeStatistics;
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41 | class BvHierarchy;
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42 | class Exporter;
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43 | class ViewCellsParseHandlers;
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44 |
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45 |
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46 | #define COUNT_ORIGIN_OBJECTS 1
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47 |
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48 | /** View space / object space hierarchy statistics.
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49 | */
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50 | class HierarchyStatistics: public StatisticsBase
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51 | {
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52 | public:
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53 | /// total number of entries in the pvs
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54 | int mPvsEntries;
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55 | /// storage cost in MB
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56 | float mMemory;
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57 | /// total number of nodes
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58 | int mNodes;
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59 | /// maximal reached depth
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60 | int mMaxDepth;
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61 | /// accumulated depth
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62 | int mAccumDepth;
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63 | /// time spent for queue repair
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64 | float mRepairTime;
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65 |
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66 | // global cost ratio violations
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67 | int mGlobalCostMisses;
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68 | /// total cost of subdivision
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69 | float mTotalCost;
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70 | /// render cost decrease of subdivision
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71 | float mRenderCostDecrease;
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72 |
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73 | // Constructor
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74 | HierarchyStatistics()
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75 | {
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76 | Reset();
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77 | }
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78 |
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79 | int Nodes() const {return mNodes;}
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80 | int Interior() const { return mNodes / 2 - 1; }
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81 | int Leaves() const { return (mNodes / 2) + 1; }
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82 |
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83 | // TODO: computation wrong
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84 | double AvgDepth() const { return mAccumDepth / (double)Leaves();}
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85 |
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86 | void Reset()
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87 | {
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88 | mGlobalCostMisses = 0;
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89 | mTotalCost = 0;
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90 | mRenderCostDecrease = 0;
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91 |
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92 | mNodes = 0;
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93 | mMaxDepth = 0;
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94 | mAccumDepth = 0;
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95 | mRepairTime = 0;
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96 | mMemory = 0;
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97 | mPvsEntries = 0;
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98 | }
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99 |
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100 | void Print(ostream &app) const;
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101 |
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102 | friend ostream &operator<<(ostream &s, const HierarchyStatistics &stat)
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103 | {
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104 | stat.Print(s);
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105 | return s;
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106 | }
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107 | };
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108 |
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109 |
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110 | class HierarchySubdivisionStats
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111 | {
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112 | public:
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113 |
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114 | int mNumSplits;
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115 |
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116 | float mRenderCostDecrease;
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117 |
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118 | float mTotalRenderCost;
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119 |
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120 | int mEntriesInPvs;
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121 |
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122 | float mMemoryCost;
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123 |
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124 | float mFullMemory;
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125 |
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126 | int mViewSpaceSplits;
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127 |
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128 | int mObjectSpaceSplits;
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129 |
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130 |
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131 | float VspOspRatio() const { return (float)mViewSpaceSplits / (float)mObjectSpaceSplits; }
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132 |
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133 | float FpsPerMb() const { return 1.0f / (mTotalRenderCost * mMemoryCost); }
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134 |
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135 | HierarchySubdivisionStats() { Reset(); }
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136 |
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137 | void Reset()
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138 | {
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139 | mNumSplits = 0;
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140 | mRenderCostDecrease = 0;
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141 | mTotalRenderCost = 0;
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142 | mEntriesInPvs = 0;
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143 | mMemoryCost = 0;
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144 | mFullMemory = 0;
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145 | mViewSpaceSplits = 0;
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146 | mObjectSpaceSplits = 0;
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147 | }
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148 |
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149 |
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150 | void Print(ostream &app) const;
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151 |
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152 | friend ostream &operator<<(ostream &s, const HierarchySubdivisionStats &stat)
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153 | {
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154 | stat.Print(s);
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155 | return s;
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156 | }
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157 | };
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158 |
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159 |
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160 | /** This class implements a structure holding two different hierarchies,
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161 | one for object space partitioning and one for view space partitioning.
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162 |
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163 | The object space and the view space are subdivided using a cost heuristics.
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164 | If an object space split or a view space split is chosen is also evaluated
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165 | based on the heuristics.
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166 |
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167 | The view space heuristics is evaluated by weighting and adding the pvss of the back and
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168 | front node of each specific split. unlike for the standalone method vspbsp tree,
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169 | the pvs of an object would not be the pvs of single object but that of all objects
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170 | which are contained in the same leaf of the object subdivision. This could be done
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171 | by storing the pointer to the object space partition parent, which would allow access to all children.
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172 | Another possibility is to include traced kd-cells in the ray casing process.
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173 |
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174 | Accordingly, the object space heuristics is evaluated by storing a pvs of view cells with each object.
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175 | the contribution to an object to the pvs is the number of view cells it can be seen from.
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176 |
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177 | @note
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178 | There is a potential efficiency problem involved in a sense that once a certain type
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179 | of split is chosen for view space / object space, the candidates for the next split of
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180 | object space / view space must be reevaluated.
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181 | */
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182 | class HierarchyManager
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183 | {
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184 | public:
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185 | /** Constructor with the view space partition tree and
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186 | the object space hierarchy type as argument.
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187 | */
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188 | HierarchyManager(const int objectSpaceHierarchyType);
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189 | /** Hack: OspTree will copy the content from this kd tree.
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190 | Only view space hierarchy will be constructed.
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191 | */
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192 | HierarchyManager(KdTree *kdTree);
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193 |
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194 | /** Deletes space partition and view space partition.
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195 | */
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196 | ~HierarchyManager();
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197 |
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198 | /** Constructs the view space and object space subdivision from a given set of rays
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199 | and a set of objects.
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200 | @param sampleRays the set of sample rays the construction is based on
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201 | @param objects the set of objects
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202 | */
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203 | void Construct(
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204 | const VssRayContainer &sampleRays,
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205 | const ObjectContainer &objects,
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206 | AxisAlignedBox3 *forcedViewSpace);
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207 |
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208 | enum
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209 | {
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210 | NO_OBJ_SUBDIV,
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211 | KD_BASED_OBJ_SUBDIV,
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212 | BV_BASED_OBJ_SUBDIV
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213 | };
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214 |
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215 | enum
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216 | {
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217 | NO_VIEWSPACE_SUBDIV,
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218 | KD_BASED_VIEWSPACE_SUBDIV
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219 | };
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220 |
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221 | /** The type of object space subdivison
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222 | */
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223 | int GetObjectSpaceSubdivisionType() const;
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224 | /** The type of view space space subdivison
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225 | */
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226 | int GetViewSpaceSubdivisionType() const;
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227 | /** Sets a pointer to the view cells manager.
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228 | */
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229 | void SetViewCellsManager(ViewCellsManager *vcm);
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230 | /** Sets a pointer to the view cells tree.
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231 | */
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232 | void SetViewCellsTree(ViewCellsTree *vcTree);
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233 | /** Exports the object hierarchy to disc.
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234 | */
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235 | void ExportObjectSpaceHierarchy(OUT_STREAM &stream);
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236 | /** Adds a sample to the pvs of the specified view cell.
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237 | */
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238 | bool AddSampleToPvs(
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239 | Intersectable *obj,
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240 | const Vector3 &hitPoint,
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241 | ViewCell *vc,
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242 | const float pdf,
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243 | float &contribution) const;
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244 |
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245 | /** Print out statistics.
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246 | */
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247 | void PrintHierarchyStatistics(ostream &stream) const;
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248 |
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249 | /** Returns the view space partition tree.
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250 | */
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251 | VspTree *GetVspTree();
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252 |
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253 | /** Returns view space bounding box.
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254 | */
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255 | //AxisAlignedBox3 GetViewSpaceBox() const;
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256 |
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257 | /** Returns object space bounding box.
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258 | */
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259 | AxisAlignedBox3 GetObjectSpaceBox() const;
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260 |
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261 | /** Exports object space hierarchy for visualization.
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262 | */
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263 | void ExportObjectSpaceHierarchy(Exporter *exporter,
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264 | const ObjectContainer &objects,
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265 | const AxisAlignedBox3 *bbox,
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266 | const bool exportBounds = true) const;
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267 |
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268 | /** Returns intersectable pierced by this ray.
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269 | */
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270 | Intersectable *GetIntersectable(const VssRay &ray, const bool isTermination) const;
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271 |
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272 | /** Export object space partition bounding boxes.
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273 | */
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274 | void ExportBoundingBoxes(OUT_STREAM &stream, const ObjectContainer &objects);
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275 |
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276 | friend ostream &operator<<(ostream &s, const HierarchyManager &hm)
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277 | {
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278 | hm.PrintHierarchyStatistics(s);
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279 | return s;
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280 | }
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281 |
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282 | HierarchyStatistics &GetHierarchyStats() { return mHierarchyStats; };
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283 |
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284 | inline bool ConsiderMemory() const { return mConsiderMemory; }
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285 | //inline float GetMemoryConst() const { return mMemoryConst; }
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286 |
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287 |
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288 | void EvaluateSubdivision(const VssRayContainer &sampleRays,
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289 | const ObjectContainer &objects,
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290 | const string &filename);
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291 |
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292 | void EvaluateSubdivision2(ofstream &splitsStats,
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293 | const int splitsStepSize);
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294 |
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295 |
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296 | void CollectObjects(const AxisAlignedBox3 &box, ObjectContainer &objects);
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297 |
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298 | float mInitialRenderCost;
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299 |
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300 |
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301 | protected:
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302 |
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303 | /** Returns true if the global termination criteria were met.
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304 | */
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305 | bool GlobalTerminationCriteriaMet(SubdivisionCandidate *candidate) const;
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306 |
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307 | /** Prepare construction of the hierarchies, set parameters, compute
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308 | first split candidates.
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309 | */
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310 | SubdivisionCandidate *PrepareObjectSpaceSubdivision(const VssRayContainer &sampleRays,
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311 | const ObjectContainer &objects);
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312 |
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313 |
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314 | /** Create bounding box and root.
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315 | */
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316 | void InitialiseObjectSpaceSubdivision(const ObjectContainer &objects);
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317 |
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318 | /** Returns memory usage of object space hierarchy.
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319 | */
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320 | float GetObjectSpaceMemUsage() const;
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321 |
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322 |
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323 | //////////////////////////////
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324 | // the main loop
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325 |
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326 | /** This is for interleaved construction / sequential construction.
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327 | */
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328 | void RunConstruction(const bool repairQueue,
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329 | const VssRayContainer &sampleRays,
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330 | const ObjectContainer &objects,
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331 | AxisAlignedBox3 *forcedViewSpace);
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332 |
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333 | /** This is for interleaved construction using some objects
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334 | and some view space splits.
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335 | */
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336 | int RunConstruction(SplitQueue &splitQueue,
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337 | SubdivisionCandidateContainer &chosenCandidates,
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338 | //const float minRenderCostDecr,
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339 | SubdivisionCandidate *oldCandidate,
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340 | const int minSteps,
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341 | const int maxSteps);
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342 |
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343 | /** Default subdivision method.
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344 | */
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345 | void RunConstruction(const bool repairQueue);
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346 |
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347 | ////////////////////////////////////////////////
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348 |
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349 | /** Evaluates the subdivision candidate and executes the split.
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350 | */
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351 | bool ApplySubdivisionCandidate(SubdivisionCandidate *sc,
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352 | SplitQueue &splitQueue,
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353 | const bool repairQueue);
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354 |
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355 | /** Tests if hierarchy construction is finished.
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356 | */
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357 | bool FinishedConstruction() const;
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358 |
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359 | /** Returns next subdivision candidate from the split queue.
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360 | */
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361 | SubdivisionCandidate *NextSubdivisionCandidate(SplitQueue &splitQueue);
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362 |
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363 | /** Repairs the dirty entries of the subdivision candidate queue. The
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364 | list of entries is given in the dirty list.
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365 | */
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366 | void RepairQueue(const SubdivisionCandidateContainer &dirtyList,
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367 | SplitQueue &splitQueue,
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368 | const bool recomputeSplitPlaneOnRepair);
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369 |
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370 | /** Collect subdivision candidates which were affected by the splits from the
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371 | chosenCandidates list.
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372 | */
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373 | void CollectDirtyCandidates(const SubdivisionCandidateContainer &chosenCandidates,
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374 | SubdivisionCandidateContainer &dirtyList);
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375 |
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376 | /** Evaluate subdivision stats for log.
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377 | */
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378 | void EvalSubdivisionStats();
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379 |
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380 | void AddSubdivisionStats(const int splits,
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381 | const float renderCostDecr,
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382 | const float totalRenderCost,
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383 | const int totalPvsEntries,
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384 | const float memory,
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385 | const float renderCostPerStorage,
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386 | const float vspOspRatio);
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387 |
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388 | bool AddSampleToPvs(Intersectable *obj,
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389 | const float pdf,
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390 | float &contribution) const;
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391 |
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392 | /** Collect affected view space candidates.
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393 | */
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394 | void CollectViewSpaceDirtyList(SubdivisionCandidate *sc,
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395 | SubdivisionCandidateContainer &dirtyList);
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396 |
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397 | /** Collect affected object space candidates.
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398 | */
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399 | void CollectObjectSpaceDirtyList(SubdivisionCandidate *sc,
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400 | SubdivisionCandidateContainer &dirtyList);
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401 |
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402 | /** Export object space partition tree.
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403 | */
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404 | void ExportOspTree(Exporter *exporter,
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405 | const ObjectContainer &objects) const;
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406 |
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407 | /** Parse the environment variables.
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408 | */
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409 | void ParseEnvironment();
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410 |
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411 | bool StartObjectSpaceSubdivision() const;
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412 | bool StartViewSpaceSubdivision() const;
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413 |
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414 |
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415 | ////////////////////////////
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416 | // Helper function for preparation of subdivision
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417 |
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418 | /** Prepare bv hierarchy for subdivision
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419 | */
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420 | SubdivisionCandidate *PrepareBvHierarchy(const VssRayContainer &sampleRays,
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421 | const ObjectContainer &objects);
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422 |
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423 | /** Prepare object space kd tree for subdivision.
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424 | */
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425 | SubdivisionCandidate *PrepareOspTree(const VssRayContainer &sampleRays,
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426 | const ObjectContainer &objects);
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427 |
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428 | /** Prepare view space subdivision and add candidate to queue.
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429 | */
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430 | SubdivisionCandidate *PrepareViewSpaceSubdivision(const VssRayContainer &sampleRays,
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431 | const ObjectContainer &objects);
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432 |
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433 | /** Was object space subdivision already constructed?
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434 | */
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435 | bool ObjectSpaceSubdivisionConstructed() const;
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436 |
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437 | /** Was view space subdivision already constructed?
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438 | */
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439 | bool ViewSpaceSubdivisionConstructed() const;
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440 |
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441 | /** Reset the split queue, i.e., reevaluate the split candidates.
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442 | */
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443 | void ResetQueue(SplitQueue &splitQueue, const bool recomputeSplitPlane);
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444 |
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445 | /** After the suddivision has ended, do some final tasks.
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446 | */
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447 | void FinishObjectSpaceSubdivision(const ObjectContainer &objects,
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448 | const bool removeRayRefs = true) const;
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449 |
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450 | /** Returns depth of object space subdivision.
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451 | */
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452 | int GetObjectSpaceSubdivisionDepth() const;
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453 |
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454 | /** Returns number of leaves in object space subdivision.
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455 | */
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456 | int GetObjectSpaceSubdivisionLeaves() const;
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457 | int GetObjectSpaceSubdivisionNodes() const;
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458 |
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459 | /** Construct object space partition interleaved with view space partition.
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460 | Each time the best object or view space candidate is selected
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461 | for the next split.
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462 | */
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463 | void ConstructInterleaved(const VssRayContainer &sampleRays,
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464 | const ObjectContainer &objects,
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465 | AxisAlignedBox3 *forcedViewSpace);
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466 |
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467 | /** Construct object space partition interleaved with view space partition.
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468 | The method chooses a number candidates of each type for subdivision.
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469 | The number is determined by the "gradient", i.e., the render cost decrease.
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470 | Once this render cost decrease is lower than the render cost decrease
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471 | for the splits of previous type, the method will stop current subdivision and
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472 | evaluate if view space or object space would be the beneficial for the
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473 | next number of split.
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474 | */
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475 | void ConstructInterleavedWithGradient(const VssRayContainer &sampleRays,
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476 | const ObjectContainer &objects,
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477 | AxisAlignedBox3 *forcedViewSpace);
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478 |
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479 | /** Use iteration to construct the object space hierarchy.
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480 | */
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481 | void ConstructMultiLevel(const VssRayContainer &sampleRays,
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482 | const ObjectContainer &objects,
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483 | AxisAlignedBox3 *forcedViewSpace);
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484 |
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485 | /** Based on a given subdivision, we try to optimize using an
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486 | multiple iteration over view and object space.
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487 | */
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488 | void OptimizeMultiLevel(const VssRayContainer &sampleRays,
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489 | const ObjectContainer &objects,
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490 | AxisAlignedBox3 *forcedViewSpace);
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491 |
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492 | /** Reset the object space subdivision.
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493 | E.g., deletes hierarchy and resets stats.
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494 | so construction can be restarted.
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495 | */
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496 | SubdivisionCandidate *ResetObjectSpaceSubdivision(const VssRayContainer &rays,
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497 | const ObjectContainer &objects);
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498 |
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499 | SubdivisionCandidate *ResetViewSpaceSubdivision(const VssRayContainer &rays,
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500 | const ObjectContainer &objects,
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501 | AxisAlignedBox3 *forcedViewSpace);
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502 |
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503 |
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504 | ///////////////////////////
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505 |
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506 | void ExportStats(ofstream &stats, SplitQueue &tQueue, const ObjectContainer &objects);
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507 |
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508 | void CollectBestSet(const int maxSplits,
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509 | const float maxMemoryCost,
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510 | ViewCellContainer &viewCells,
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511 | vector<BvhNode *> &bvhNodes);
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512 |
|
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513 | int ExtractStatistics(const int maxSplits,
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514 | const float maxMemoryCost,
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515 | float &renderCost,
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516 | float &memory,
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517 | int &pvsEntries,
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518 | int &viewSpaceSplits,
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519 | int &objectSpaceSplits);
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520 |
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521 |
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522 | protected:
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523 |
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524 | /** construction types
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525 | sequential: construct first view space, then object space
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526 | interleaved: construct view space and object space fully interleaved
|
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527 | gradient: construct view space / object space until a threshold is reached
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528 | multilevel: iterate until subdivisions converge to the optimum.
|
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529 | */
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530 | enum {SEQUENTIAL, INTERLEAVED, GRADIENT, MULTILEVEL};
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531 |
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532 | /// type of hierarchy construction
|
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533 | int mConstructionType;
|
---|
534 |
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---|
535 | /// Type of object space partition
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---|
536 | int mObjectSpaceSubdivisionType;
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---|
537 | /// Type of view space partition
|
---|
538 | int mViewSpaceSubdivisionType;
|
---|
539 |
|
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540 | /// the traversal queue
|
---|
541 | SplitQueue mTQueue;
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542 |
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543 | ////////////
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544 | //-- helper variables
|
---|
545 |
|
---|
546 | // the original osp type
|
---|
547 | int mSavedObjectSpaceSubdivisionType;
|
---|
548 | // the original vsp type
|
---|
549 | int mSavedViewSpaceSubdivisionType;
|
---|
550 | /// the current subdivision candidate
|
---|
551 | //SubdivisionCandidate *mCurrentCandidate;
|
---|
552 |
|
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553 |
|
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554 | ///////////////////
|
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555 | // Hierarchies
|
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556 |
|
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557 | /// view space hierarchy
|
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558 | VspTree *mVspTree;
|
---|
559 | /// object space partition kd tree
|
---|
560 | OspTree *mOspTree;
|
---|
561 |
|
---|
562 | public:
|
---|
563 | /// bounding volume hierarchy
|
---|
564 | BvHierarchy *mBvHierarchy;
|
---|
565 |
|
---|
566 | protected:
|
---|
567 |
|
---|
568 |
|
---|
569 | //////////
|
---|
570 | //-- global termination criteria
|
---|
571 |
|
---|
572 | /// the mininal acceptable cost ratio for a split
|
---|
573 | float mTermMinGlobalCostRatio;
|
---|
574 | /// the threshold for global cost miss tolerance
|
---|
575 | int mTermGlobalCostMissTolerance;
|
---|
576 | /// maximum number of leaves
|
---|
577 | int mTermMaxLeaves;
|
---|
578 | /// Maximal allowed memory consumption.
|
---|
579 | float mTermMaxMemory;
|
---|
580 |
|
---|
581 |
|
---|
582 | ////////////////////
|
---|
583 |
|
---|
584 | /// number of minimal steps of the same type
|
---|
585 | int mMinStepsOfSameType;
|
---|
586 | int mMaxStepsOfSameType;
|
---|
587 |
|
---|
588 | /// statistics about the hierarchy
|
---|
589 | HierarchyStatistics mHierarchyStats;
|
---|
590 |
|
---|
591 | int mMinDepthForObjectSpaceSubdivion;
|
---|
592 | int mMinDepthForViewSpaceSubdivion;
|
---|
593 |
|
---|
594 | //int mMinRenderCostDecrease;
|
---|
595 |
|
---|
596 | ofstream mSubdivisionStats;
|
---|
597 |
|
---|
598 | /// if the queue should be repaired after a subdivision steps
|
---|
599 | bool mRepairQueue;
|
---|
600 |
|
---|
601 | bool mStartWithObjectSpace;
|
---|
602 | /** if multi level construction method should be used
|
---|
603 | where we iterate over both hierarchies until we
|
---|
604 | converge to the optimum.
|
---|
605 | */
|
---|
606 | bool mUseMultiLevelConstruction;
|
---|
607 |
|
---|
608 | /// number of iteration steps for multilevel approach
|
---|
609 | int mNumMultiLevels;
|
---|
610 |
|
---|
611 | /** if split plane should be recomputed for the repair.
|
---|
612 | Otherwise only the priority is recomputed, the
|
---|
613 | split plane itself stays the same
|
---|
614 | */
|
---|
615 | bool mRecomputeSplitPlaneOnRepair;
|
---|
616 |
|
---|
617 | /** If memory should be considered during choosing
|
---|
618 | of the next split type during gradient method.
|
---|
619 | */
|
---|
620 | bool mConsiderMemory;
|
---|
621 |
|
---|
622 | bool mConsiderMemory2;
|
---|
623 |
|
---|
624 | int mMaxRepairs;
|
---|
625 |
|
---|
626 | int mTimeStamp;
|
---|
627 | friend VspTree;
|
---|
628 | friend OspTree;
|
---|
629 | friend BvHierarchy;
|
---|
630 | friend ViewCellsParseHandlers;
|
---|
631 |
|
---|
632 | };
|
---|
633 |
|
---|
634 | }
|
---|
635 |
|
---|
636 | #endif
|
---|