1 | #ifndef _VspOspTree_H__
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2 | #define _VspOspTree_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 "FlexibleHeap.h"
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13 |
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14 |
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15 | namespace GtpVisibilityPreprocessor {
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16 |
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17 | class ViewCellLeaf;
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18 | //class VspViewCell;
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19 | class Plane3;
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20 | class AxisAlignedBox3;
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21 | class Ray;
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22 | class ViewCellsStatistics;
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23 | class ViewCellsManager;
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24 | class MergeCandidate;
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25 | class Beam;
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26 | class ViewCellsTree;
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27 | class Environment;
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28 | class VspInterior;
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29 | class VspLeaf;
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30 | class VspNode;
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31 | class KdNode;
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32 | class KdInterior;
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33 | class KdLeaf;
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34 |
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35 | class KdTreeStatistics;
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36 |
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37 | template <typename T> class GtPriority
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38 | {
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39 | public:
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40 | bool operator() (const T c1, const T c2) const
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41 | {
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42 | //return false;
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43 | return c1->GetPriority() < c2->GetPriority();
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44 | }
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45 | };
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46 |
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47 |
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48 | /** Candidate for a view space / object space split.
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49 | */
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50 | class SplitCandidate: public Heapable
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51 | {
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52 | public:
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53 |
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54 | enum {OBJECT_SPACE, VIEW_SPACE};
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55 |
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56 | /// the current split plane
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57 | AxisAlignedPlane mSplitPlane;
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58 | /// split axis of this plane (0, 1, 2, or 3 if non-axis-aligned)
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59 | int mSplitAxis;
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60 | /// the number of misses of max cost ratio until this split
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61 | int mMaxCostMisses;
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62 |
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63 | /// priority of this split
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64 | //float mPriority;
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65 |
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66 | SplitCandidate()
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67 | {};
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68 |
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69 | SplitCandidate(const AxisAlignedPlane &plane): mSplitPlane(plane)
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70 | {}
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71 |
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72 | virtual void EvalPriority() = 0;
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73 | virtual int Type() const = 0;
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74 | virtual bool GlobalTerminationCriteriaMet() const = 0;
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75 | };
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76 |
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77 |
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78 | /** View space partition statistics.
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79 | */
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80 | class VspTreeStatistics: public StatisticsBase
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81 | {
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82 | public:
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83 | // total number of nodes
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84 | int nodes;
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85 | // number of splits
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86 | int splits[3];
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87 |
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88 | // totals number of rays
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89 | int rays;
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90 | // maximal reached depth
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91 | int maxDepth;
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92 | // minimal depth
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93 | int minDepth;
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94 |
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95 | // max depth nodes
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96 | int maxDepthNodes;
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97 | // minimum depth nodes
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98 | int minDepthNodes;
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99 | // max depth nodes
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100 | int minPvsNodes;
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101 | // nodes with minimum PVS
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102 | int minRaysNodes;
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103 | // max ray contribution nodes
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104 | int maxRayContribNodes;
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105 | // minimum area nodes
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106 | int minProbabilityNodes;
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107 | /// nodes termination because of max cost ratio;
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108 | int maxCostNodes;
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109 | // max number of rays per node
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110 | int maxObjectRefs;
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111 | /// samples contributing to pvs
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112 | int contributingSamples;
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113 | /// sample contributions to pvs
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114 | int sampleContributions;
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115 | /// largest pvs
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116 | int maxPvs;
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117 | /// number of invalid leaves
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118 | int invalidLeaves;
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119 | /// accumulated number of rays refs
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120 | int accumRays;
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121 | int pvs;
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122 | // accumulated depth (used to compute average)
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123 | int accumDepth;
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124 |
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125 | // Constructor
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126 | VspTreeStatistics()
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127 | {
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128 | Reset();
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129 | }
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130 |
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131 | int Nodes() const {return nodes;}
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132 | int Interior() const { return nodes / 2; }
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133 | int Leaves() const { return (nodes / 2) + 1; }
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134 |
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135 | // TODO: computation wrong
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136 | double AvgDepth() const { return accumDepth / (double)Leaves();};
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137 | double AvgRays() const { return accumRays / (double)Leaves();};
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138 |
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139 | void Reset()
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140 | {
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141 | nodes = 0;
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142 | for (int i = 0; i < 3; ++ i)
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143 | splits[i] = 0;
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144 |
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145 | maxDepth = 0;
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146 | minDepth = 99999;
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147 | accumDepth = 0;
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148 | pvs = 0;
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149 | maxDepthNodes = 0;
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150 | minPvsNodes = 0;
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151 | minRaysNodes = 0;
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152 | maxRayContribNodes = 0;
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153 | minProbabilityNodes = 0;
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154 | maxCostNodes = 0;
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155 |
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156 | contributingSamples = 0;
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157 | sampleContributions = 0;
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158 |
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159 | maxPvs = 0;
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160 | invalidLeaves = 0;
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161 | accumRays = 0;
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162 | }
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163 |
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164 | void Print(ostream &app) const;
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165 |
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166 | friend ostream &operator<<(ostream &s, const VspTreeStatistics &stat)
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167 | {
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168 | stat.Print(s);
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169 | return s;
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170 | }
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171 | };
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172 |
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173 |
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174 | /** View space partition statistics.
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175 | */
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176 | class OspTreeStatistics: public StatisticsBase
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177 | {
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178 | public:
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179 | // total number of nodes
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180 | int nodes;
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181 | // number of splits
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182 | int splits[3];
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183 |
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184 | // maximal reached depth
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185 | int maxDepth;
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186 | // minimal depth
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187 | int minDepth;
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188 |
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189 | // max depth nodes
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190 | int maxDepthNodes;
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191 | // minimum depth nodes
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192 | int minDepthNodes;
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193 | // max depth nodes
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194 | int minPvsNodes;
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195 | // minimum area nodes
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196 | int minProbabilityNodes;
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197 | /// nodes termination because of max cost ratio;
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198 | int maxCostNodes;
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199 | // max number of objects per node
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200 | int maxObjectRefs;
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201 | int objectRefs;
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202 | /// samples contributing to pvs
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203 | int contributingSamples;
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204 | /// sample contributions to pvs
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205 | int sampleContributions;
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206 | /// largest pvs
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207 | int maxPvs;
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208 | /// number of invalid leaves
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209 | int invalidLeaves;
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210 | /// accumulated number of rays refs
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211 | int accumRays;
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212 | /// potentially visible objects from this leaf
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213 | int pvs;
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214 |
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215 | // accumulated depth (used to compute average)
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216 | int accumDepth;
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217 |
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218 | // Constructor
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219 | OspTreeStatistics()
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220 | {
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221 | Reset();
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222 | }
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223 |
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224 | int Nodes() const {return nodes;}
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225 | int Interior() const { return nodes / 2; }
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226 | int Leaves() const { return (nodes / 2) + 1; }
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227 |
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228 | // TODO: computation wrong
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229 | double AvgDepth() const { return accumDepth / (double)Leaves();};
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230 |
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231 |
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232 | void Reset()
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233 | {
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234 | nodes = 0;
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235 | for (int i = 0; i < 3; ++ i)
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236 | splits[i] = 0;
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237 |
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238 | maxDepth = 0;
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239 | minDepth = 99999;
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240 | accumDepth = 0;
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241 | pvs = 0;
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242 | maxDepthNodes = 0;
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243 | minPvsNodes = 0;
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244 |
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245 | minProbabilityNodes = 0;
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246 | maxCostNodes = 0;
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247 |
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248 | contributingSamples = 0;
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249 | sampleContributions = 0;
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250 |
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251 | maxPvs = 0;
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252 | invalidLeaves = 0;
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253 | objectRefs = 0;
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254 | }
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255 |
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256 |
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257 | void Print(ostream &app) const;
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258 |
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259 | friend ostream &operator<<(ostream &s, const OspTreeStatistics &stat)
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260 | {
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261 | stat.Print(s);
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262 | return s;
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263 | }
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264 | };
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265 |
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266 |
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267 | /**
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268 | VspNode abstract class serving for interior and leaf node implementation
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269 | */
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270 | class VspNode
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271 | {
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272 | public:
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273 |
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274 | // types of vsp nodes
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275 | enum {Interior, Leaf};
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276 |
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277 | VspNode();
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278 | virtual ~VspNode(){};
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279 | VspNode(VspInterior *parent);
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280 |
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281 | /** Determines whether this node is a leaf or not
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282 | @return true if leaf
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283 | */
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284 | virtual bool IsLeaf() const = 0;
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285 |
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286 | virtual int Type() const = 0;
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287 |
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288 | /** Determines whether this node is a root
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289 | @return true if root
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290 | */
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291 | virtual bool IsRoot() const;
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292 |
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293 | /** Returns parent node.
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294 | */
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295 | VspInterior *GetParent();
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296 |
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297 | /** Sets parent node.
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298 | */
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299 | void SetParent(VspInterior *parent);
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300 |
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301 | /** Returns true if this node is a sibling of node n.
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302 | */
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303 | bool IsSibling(VspNode *n) const;
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304 |
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305 | /** returns depth of the node.
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306 | */
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307 | int GetDepth() const;
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308 |
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309 | /** returns true if the whole subtree is valid
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310 | */
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311 | bool TreeValid() const;
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312 |
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313 | void SetTreeValid(const bool v);
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314 |
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315 | //-- mailing options
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316 |
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317 | void Mail() { mMailbox = sMailId; }
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318 | static void NewMail() { ++ sMailId; }
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319 | bool Mailed() const { return mMailbox == sMailId; }
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320 |
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321 | static int sMailId;
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322 | int mMailbox;
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323 |
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324 | int mTimeStamp;
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325 |
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326 | protected:
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327 |
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328 | /// if this sub tree is a completely valid view space region
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329 | bool mTreeValid;
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330 | /// parent of this node
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331 | VspInterior *mParent;
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332 | };
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333 |
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334 |
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335 | /** BSP interior node implementation
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336 | */
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337 | class VspInterior: public VspNode
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338 | {
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339 | public:
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340 | /** Standard contructor taking split plane as argument.
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341 | */
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342 | VspInterior(const AxisAlignedPlane &plane);
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343 |
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344 | ~VspInterior();
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345 | /** @return false since it is an interior node
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346 | */
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347 | bool IsLeaf() const;
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348 |
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349 | int Type() const;
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350 |
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351 | VspNode *GetBack();
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352 | VspNode *GetFront();
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353 |
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354 | /** Returns split plane.
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355 | */
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356 | AxisAlignedPlane GetPlane() const;
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357 |
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358 | /** Returns position of split plane.
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359 | */
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360 | float GetPosition() const;
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361 |
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362 | /** Returns split axis.
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363 | */
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364 | int GetAxis() const;
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365 |
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366 | /** Replace front or back child with new child.
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367 | */
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368 | void ReplaceChildLink(VspNode *oldChild, VspNode *newChild);
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369 |
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370 | /** Replace front and back child.
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371 | */
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372 | void SetupChildLinks(VspNode *front, VspNode *back);
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373 |
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374 | friend ostream &operator<<(ostream &s, const VspInterior &A)
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375 | {
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376 | return s << A.mPlane.mAxis << " " << A.mPlane.mPosition;
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377 | }
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378 |
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379 | AxisAlignedBox3 GetBoundingBox() const;
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380 | void SetBoundingBox(const AxisAlignedBox3 &box);
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381 |
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382 | /** Computes intersection of this plane with the ray segment.
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383 | */
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384 | int ComputeRayIntersection(const RayInfo &rayData, float &t) const
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385 | {
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386 | return rayData.ComputeRayIntersection(mPlane.mAxis, mPlane.mPosition, t);
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387 | }
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388 |
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389 |
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390 | protected:
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391 |
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392 | AxisAlignedBox3 mBoundingBox;
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393 |
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394 | /// Splitting plane corresponding to this node
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395 | AxisAlignedPlane mPlane;
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396 |
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397 | /// back node
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398 | VspNode *mBack;
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399 | /// front node
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400 | VspNode *mFront;
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401 | };
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402 |
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403 |
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404 | /** BSP leaf node implementation.
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405 | */
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406 | class VspLeaf: public VspNode
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407 | {
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408 |
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409 | public:
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410 | VspLeaf();
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411 | VspLeaf(ViewCellLeaf *viewCell);
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412 | VspLeaf(VspInterior *parent);
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413 | VspLeaf(VspInterior *parent, ViewCellLeaf *viewCell);
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414 |
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415 | ~VspLeaf();
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416 |
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417 | /** @return true since it is an interior node
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418 | */
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419 | bool IsLeaf() const;
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420 |
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421 | int Type() const;
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422 |
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423 | /** Returns pointer of view cell.
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424 | */
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425 | ViewCellLeaf *GetViewCell() const;
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426 |
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427 | /** Sets pointer to view cell.
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428 | */
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429 | void SetViewCell(ViewCellLeaf *viewCell);
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430 |
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431 | SplitCandidate *GetSplitCandidate() const
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432 | { return mSplitCandidate; }
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433 |
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434 | public:
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435 |
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436 | /// Rays piercing this leaf.
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437 | VssRayContainer mVssRays;
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438 |
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439 | /// leaf pvs
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440 | ObjectPvs *mPvs;
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441 |
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442 | /// Probability that the view point lies in this leaf
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443 | float mProbability;
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444 |
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445 | protected:
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446 |
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447 | /// pointer to a split plane candidate splitting this leaf
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448 | SplitCandidate *mSplitCandidate;
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449 |
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450 | /// if NULL this does not correspond to feasible viewcell
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451 | ViewCellLeaf *mViewCell;
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452 | };
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453 |
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454 |
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455 | #if 0
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456 | typedef std::priority_queue<SplitCandidate *,
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457 | std::vector<SplitCandidate *>,
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458 | GtPriority<std::vector<SplitCandidate *>::value_type> > SplitQueue;
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459 | #endif
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460 |
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461 | typedef FlexibleHeap<SplitCandidate *> SplitQueue;
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462 |
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463 | /** View Space Partitioning tree.
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464 | */
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465 | class VspTree
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466 | {
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467 | friend class ViewCellsParseHandlers;
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468 | friend class HierarchyManager;
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469 |
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470 | public:
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471 |
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472 | /** Additional data which is passed down the BSP tree during traversal.
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473 | */
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474 | class VspTraversalData
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475 | {
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476 | public:
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477 | /// the current node
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478 | VspLeaf *mNode;
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479 | /// current depth
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480 | int mDepth;
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481 | /// rays piercing this node
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482 | RayInfoContainer *mRays;
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483 | /// the probability that this node contains view point
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484 | float mProbability;
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485 | /// the bounding box of the node
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486 | AxisAlignedBox3 mBoundingBox;
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487 | /// pvs size
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488 | int mPvs;
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489 | /// how often this branch has missed the max-cost ratio
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490 | int mMaxCostMisses;
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491 | // current priority
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492 | float mPriority;
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493 |
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494 |
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495 | /** Returns average ray contribution.
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496 | */
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497 | float GetAvgRayContribution() const
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498 | {
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499 | return (float)mPvs / ((float)mRays->size() + Limits::Small);
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500 | }
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501 |
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502 |
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503 | VspTraversalData():
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504 | mNode(NULL),
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505 | mDepth(0),
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506 | mRays(NULL),
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507 | mPvs(0),
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508 | mProbability(0.0),
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509 | mMaxCostMisses(0),
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510 | mPriority(0)
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511 | {}
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512 |
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513 | VspTraversalData(VspLeaf *node,
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514 | const int depth,
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515 | RayInfoContainer *rays,
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516 | const int pvs,
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517 | const float p,
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518 | const AxisAlignedBox3 &box):
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519 | mNode(node),
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520 | mDepth(depth),
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521 | mRays(rays),
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522 | mPvs(pvs),
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523 | mProbability(p),
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524 | mBoundingBox(box),
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525 | mMaxCostMisses(0),
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526 | mPriority(0)
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527 | {}
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528 |
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529 | VspTraversalData(const int depth,
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530 | RayInfoContainer *rays,
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531 | const AxisAlignedBox3 &box):
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532 | mNode(NULL),
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533 | mDepth(depth),
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534 | mRays(rays),
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535 | mPvs(0),
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536 | mProbability(0),
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537 | mMaxCostMisses(0),
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538 | mBoundingBox(box)
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539 | {}
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540 |
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541 | /** Returns cost of the traversal data.
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542 | */
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543 | float GetCost() const
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544 | {
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545 | //cout << mPriority << endl;
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546 | return mPriority;
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547 | }
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548 |
|
---|
549 | // deletes contents and sets them to NULL
|
---|
550 | void Clear()
|
---|
551 | {
|
---|
552 | DEL_PTR(mRays);
|
---|
553 | }
|
---|
554 |
|
---|
555 | friend bool operator<(const VspTraversalData &a, const VspTraversalData &b)
|
---|
556 | {
|
---|
557 | return a.GetCost() < b.GetCost();
|
---|
558 | }
|
---|
559 | };
|
---|
560 |
|
---|
561 | /** Candidate for a view space split.
|
---|
562 | */
|
---|
563 | class VspSplitCandidate: public SplitCandidate
|
---|
564 | {
|
---|
565 | public:
|
---|
566 |
|
---|
567 | static VspTree* sVspTree;
|
---|
568 |
|
---|
569 | /// parent node traversal data
|
---|
570 | VspTraversalData mParentData;
|
---|
571 |
|
---|
572 | VspSplitCandidate(const VspTraversalData &tData): mParentData(tData)
|
---|
573 | {};
|
---|
574 |
|
---|
575 | int Type() const { return VIEW_SPACE; }
|
---|
576 |
|
---|
577 | void EvalPriority()
|
---|
578 | {
|
---|
579 | sVspTree->EvalSplitCandidate(*this);
|
---|
580 | }
|
---|
581 |
|
---|
582 | bool GlobalTerminationCriteriaMet() const
|
---|
583 | {
|
---|
584 | return sVspTree->GlobalTerminationCriteriaMet(mParentData);
|
---|
585 | }
|
---|
586 |
|
---|
587 | VspSplitCandidate(const AxisAlignedPlane &plane, const VspTraversalData &tData):
|
---|
588 | SplitCandidate(plane), mParentData(tData)
|
---|
589 | {}
|
---|
590 | };
|
---|
591 |
|
---|
592 | /** Struct for traversing line segment.
|
---|
593 | */
|
---|
594 | struct LineTraversalData
|
---|
595 | {
|
---|
596 | VspNode *mNode;
|
---|
597 | Vector3 mExitPoint;
|
---|
598 |
|
---|
599 | float mMaxT;
|
---|
600 |
|
---|
601 | LineTraversalData () {}
|
---|
602 | LineTraversalData (VspNode *n, const Vector3 &p, const float maxt):
|
---|
603 | mNode(n), mExitPoint(p), mMaxT(maxt) {}
|
---|
604 | };
|
---|
605 |
|
---|
606 | //typedef std::priority_queue<VspTraversalData> VspOspTraversalQueue;
|
---|
607 |
|
---|
608 | /** Default constructor creating an empty tree.
|
---|
609 | */
|
---|
610 | VspTree();
|
---|
611 |
|
---|
612 | /** Default destructor.
|
---|
613 | */
|
---|
614 | ~VspTree();
|
---|
615 |
|
---|
616 | /** Returns BSP Tree statistics.
|
---|
617 | */
|
---|
618 | const VspTreeStatistics &GetStatistics() const;
|
---|
619 |
|
---|
620 | /** Returns bounding box of the specified node.
|
---|
621 | */
|
---|
622 | AxisAlignedBox3 GetBBox(VspNode *node) const;
|
---|
623 |
|
---|
624 | /** Returns list of BSP leaves with pvs smaller than
|
---|
625 | a certain threshold.
|
---|
626 | @param onlyUnmailed if only the unmailed leaves should be considered
|
---|
627 | @param maxPvs the maximal pvs of a leaf to be added (-1 means unlimited)
|
---|
628 | */
|
---|
629 | void CollectLeaves(vector<VspLeaf *> &leaves,
|
---|
630 | const bool onlyUnmailed = false,
|
---|
631 | const int maxPvs = -1) const;
|
---|
632 |
|
---|
633 | /** Returns box which bounds the whole tree.
|
---|
634 | */
|
---|
635 | AxisAlignedBox3 GetBoundingBox() const;
|
---|
636 |
|
---|
637 | /** Returns root of the view space partitioning tree.
|
---|
638 | */
|
---|
639 | VspNode *GetRoot() const;
|
---|
640 |
|
---|
641 | /** Collects the leaf view cells of the tree
|
---|
642 | @param viewCells returns the view cells
|
---|
643 | */
|
---|
644 | void CollectViewCells(ViewCellContainer &viewCells, bool onlyValid) const;
|
---|
645 |
|
---|
646 | /** A ray is cast possible intersecting the tree.
|
---|
647 | @param the ray that is cast.
|
---|
648 | @returns the number of intersections with objects stored in the tree.
|
---|
649 | */
|
---|
650 | int CastRay(Ray &ray);
|
---|
651 |
|
---|
652 |
|
---|
653 | /** finds neighbouring leaves of this tree node.
|
---|
654 | */
|
---|
655 | int FindNeighbors(VspLeaf *n,
|
---|
656 | vector<VspLeaf *> &neighbors,
|
---|
657 | const bool onlyUnmailed) const;
|
---|
658 |
|
---|
659 | /** Returns random leaf of BSP tree.
|
---|
660 | @param halfspace defines the halfspace from which the leaf is taken.
|
---|
661 | */
|
---|
662 | VspLeaf *GetRandomLeaf(const Plane3 &halfspace);
|
---|
663 |
|
---|
664 | /** Returns random leaf of BSP tree.
|
---|
665 | @param onlyUnmailed if only unmailed leaves should be returned.
|
---|
666 | */
|
---|
667 | VspLeaf *GetRandomLeaf(const bool onlyUnmailed = false);
|
---|
668 |
|
---|
669 | /** Returns epsilon of this tree.
|
---|
670 | */
|
---|
671 | float GetEpsilon() const;
|
---|
672 |
|
---|
673 | /** Casts line segment into the tree.
|
---|
674 | @param origin the origin of the line segment
|
---|
675 | @param termination the end point of the line segment
|
---|
676 | @returns view cells intersecting the line segment.
|
---|
677 | */
|
---|
678 | int CastLineSegment(const Vector3 &origin,
|
---|
679 | const Vector3 &termination,
|
---|
680 | ViewCellContainer &viewcells);
|
---|
681 |
|
---|
682 |
|
---|
683 | /** Sets pointer to view cells manager.
|
---|
684 | */
|
---|
685 | void SetViewCellsManager(ViewCellsManager *vcm);
|
---|
686 |
|
---|
687 | /** Returns view cell the current point is located in.
|
---|
688 | @param point the current view point
|
---|
689 | @param active if currently active view cells should be returned or
|
---|
690 | elementary view cell
|
---|
691 | */
|
---|
692 | ViewCell *GetViewCell(const Vector3 &point, const bool active = false);
|
---|
693 |
|
---|
694 |
|
---|
695 | /** Returns true if this view point is in a valid view space,
|
---|
696 | false otherwise.
|
---|
697 | */
|
---|
698 | bool ViewPointValid(const Vector3 &viewPoint) const;
|
---|
699 |
|
---|
700 | /** Returns view cell corresponding to
|
---|
701 | the invalid view space.
|
---|
702 | */
|
---|
703 | VspViewCell *GetOutOfBoundsCell();
|
---|
704 |
|
---|
705 | /** Writes tree to output stream
|
---|
706 | */
|
---|
707 | #if ZIPPED_VIEWCELLS
|
---|
708 | bool Export(ogzstream &stream);
|
---|
709 | #else
|
---|
710 | bool Export(ofstream &stream);
|
---|
711 | #endif
|
---|
712 |
|
---|
713 | /** Casts beam, i.e. a 5D frustum of rays, into tree.
|
---|
714 | Tests conservative using the bounding box of the nodes.
|
---|
715 | @returns number of view cells it intersected
|
---|
716 | */
|
---|
717 | int CastBeam(Beam &beam);
|
---|
718 |
|
---|
719 |
|
---|
720 | /** Checks if tree validity-flags are right
|
---|
721 | with respect to view cell valitiy.
|
---|
722 | If not, marks subtree as invalid.
|
---|
723 | */
|
---|
724 | void ValidateTree();
|
---|
725 |
|
---|
726 | /** Invalid view cells are added to the unbounded space
|
---|
727 | */
|
---|
728 | void CollapseViewCells();
|
---|
729 |
|
---|
730 | /** Collects rays stored in the leaves.
|
---|
731 | */
|
---|
732 | void CollectRays(VssRayContainer &rays);
|
---|
733 |
|
---|
734 | /** Intersects box with the tree and returns the number of intersected boxes.
|
---|
735 | @returns number of view cells found
|
---|
736 | */
|
---|
737 | int ComputeBoxIntersections(const AxisAlignedBox3 &box,
|
---|
738 | ViewCellContainer &viewCells) const;
|
---|
739 |
|
---|
740 | /// pointer to the hierarchy of view cells
|
---|
741 | ViewCellsTree *mViewCellsTree;
|
---|
742 |
|
---|
743 | /** Remove the references of the parent view cell from the kd nodes associated with
|
---|
744 | the objects.
|
---|
745 | */
|
---|
746 | void RemoveParentViewCellReferences(ViewCell *parent) const;
|
---|
747 |
|
---|
748 | /** Adds references to the view cell to the kd nodes associated with the objects.
|
---|
749 | */
|
---|
750 | void AddViewCellReferences(ViewCell *vc) const;
|
---|
751 |
|
---|
752 |
|
---|
753 | protected:
|
---|
754 |
|
---|
755 | // --------------------------------------------------------------
|
---|
756 | // For sorting objects
|
---|
757 | // --------------------------------------------------------------
|
---|
758 | struct SortableEntry
|
---|
759 | {
|
---|
760 | enum EType
|
---|
761 | {
|
---|
762 | ERayMin,
|
---|
763 | ERayMax
|
---|
764 | };
|
---|
765 |
|
---|
766 | int type;
|
---|
767 | float value;
|
---|
768 | VssRay *ray;
|
---|
769 |
|
---|
770 | SortableEntry() {}
|
---|
771 | SortableEntry(const int t, const float v, VssRay *r):
|
---|
772 | type(t), value(v), ray(r)
|
---|
773 | {
|
---|
774 | }
|
---|
775 |
|
---|
776 | friend bool operator<(const SortableEntry &a, const SortableEntry &b)
|
---|
777 | {
|
---|
778 | return a.value < b.value;
|
---|
779 | }
|
---|
780 | };
|
---|
781 |
|
---|
782 | /** faster evaluation of split plane cost for kd axis aligned cells.
|
---|
783 | */
|
---|
784 | float EvalLocalSplitCost(const VspTraversalData &data,
|
---|
785 | const AxisAlignedBox3 &box,
|
---|
786 | const int axis,
|
---|
787 | const float &position,
|
---|
788 | float &pFront,
|
---|
789 | float &pBack) const;
|
---|
790 |
|
---|
791 | void PrepareConstruction(const VssRayContainer &sampleRays,
|
---|
792 | AxisAlignedBox3 *forcedBoundingBox);
|
---|
793 |
|
---|
794 | /** Evaluates candidate for splitting.
|
---|
795 | */
|
---|
796 | void EvalSplitCandidate(VspSplitCandidate &splitData);
|
---|
797 |
|
---|
798 | /** Evaluates render cost decrease of next split.
|
---|
799 | */
|
---|
800 | float EvalRenderCostDecrease(const AxisAlignedPlane &candidatePlane,
|
---|
801 | const VspTraversalData &data) const;
|
---|
802 |
|
---|
803 | /** Collects view cells in the subtree under root.
|
---|
804 | */
|
---|
805 | void CollectViewCells(VspNode *root,
|
---|
806 | bool onlyValid,
|
---|
807 | ViewCellContainer &viewCells,
|
---|
808 | bool onlyUnmailed = false) const;
|
---|
809 |
|
---|
810 | /** Returns view cell corresponding to
|
---|
811 | the invalid view space. If it does not exist, it is created.
|
---|
812 | */
|
---|
813 | VspViewCell *GetOrCreateOutOfBoundsCell();
|
---|
814 |
|
---|
815 | /** Collapses the tree with respect to the view cell partition,
|
---|
816 | i.e. leaves having the same view cell are collapsed.
|
---|
817 | @param node the root of the subtree to be collapsed
|
---|
818 | @param collapsed returns the number of collapsed nodes
|
---|
819 | @returns node of type leaf if the node could be collapsed,
|
---|
820 | this node otherwise
|
---|
821 | */
|
---|
822 | VspNode *CollapseTree(VspNode *node, int &collapsed);
|
---|
823 |
|
---|
824 | /** Helper function revalidating the view cell leaf list after merge.
|
---|
825 | */
|
---|
826 | void RepairViewCellsLeafLists();
|
---|
827 |
|
---|
828 | /** Evaluates tree stats in the BSP tree leafs.
|
---|
829 | */
|
---|
830 | void EvaluateLeafStats(const VspTraversalData &data);
|
---|
831 |
|
---|
832 | /** Subdivides node using a best split priority queue.
|
---|
833 | @param tQueue the best split priority queue
|
---|
834 | @param splitCandidate the candidate for the next split
|
---|
835 | @param globalCriteriaMet if the global termination criteria were already met
|
---|
836 | @returns new root of the subtree
|
---|
837 | */
|
---|
838 | VspNode *Subdivide(SplitQueue &tQueue,
|
---|
839 | VspSplitCandidate &splitCandidate,
|
---|
840 | const bool globalCriteriaMet);
|
---|
841 |
|
---|
842 | /** Adds stats to subdivision log file.
|
---|
843 | */
|
---|
844 | void AddSubdivisionStats(const int viewCells,
|
---|
845 | const float renderCostDecr,
|
---|
846 | const float splitCandidateCost,
|
---|
847 | const float totalRenderCost,
|
---|
848 | const float avgRenderCost);
|
---|
849 |
|
---|
850 | /** Subdivides leaf.
|
---|
851 |
|
---|
852 | @param tData data object holding, e.g., a pointer to the leaf
|
---|
853 | @param frontData returns the data (e.g., pointer to the leaf) in front of the split plane
|
---|
854 | @param backData returns the data (e.g., pointer to the leaf) in the back of the split plane
|
---|
855 |
|
---|
856 | @param rays the polygons to be filtered
|
---|
857 | @param frontRays returns the polygons in front of the split plane
|
---|
858 |
|
---|
859 | @returns the root of the subdivision
|
---|
860 | */
|
---|
861 | VspInterior *SubdivideNode(const AxisAlignedPlane &splitPlane,
|
---|
862 | VspTraversalData &tData,
|
---|
863 | VspTraversalData &frontData,
|
---|
864 | VspTraversalData &backData);
|
---|
865 |
|
---|
866 | /** Selects an axis aligned for the next split.
|
---|
867 | @returns cost for this split
|
---|
868 | */
|
---|
869 | float SelectSplitPlane(const VspTraversalData &tData,
|
---|
870 | AxisAlignedPlane &plane,
|
---|
871 | float &pFront,
|
---|
872 | float &pBack);
|
---|
873 |
|
---|
874 | /** Sorts split candidates along the specified axis.
|
---|
875 | The split candidates are generated on possible visibility
|
---|
876 | events (i.e., where ray segments intersect the ray boundaries).
|
---|
877 | The sorted candidates are needed to compute the heuristics.
|
---|
878 |
|
---|
879 | @param polys the input for choosing split candidates
|
---|
880 | @param axis the current split axis
|
---|
881 | @param splitCandidates returns sorted list of split candidates
|
---|
882 | */
|
---|
883 | void SortSplitCandidates(const RayInfoContainer &rays,
|
---|
884 | const int axis,
|
---|
885 | float minBand,
|
---|
886 | float maxBand);
|
---|
887 |
|
---|
888 | /** Computes pvs increase with respect to the previous pvs for heuristics.
|
---|
889 | */
|
---|
890 | int GetPvsIncr(Intersectable *object, const KdPvsMap &activeNodes);
|
---|
891 |
|
---|
892 | /** Returns absolute pvs contribution of this object.
|
---|
893 | */
|
---|
894 | int GetPvsContribution(Intersectable *object) const;
|
---|
895 |
|
---|
896 | /** Computes best cost for axis aligned planes.
|
---|
897 | */
|
---|
898 | float EvalLocalCostHeuristics(const RayInfoContainer &rays,
|
---|
899 | const AxisAlignedBox3 &box,
|
---|
900 | int pvsSize,
|
---|
901 | const int axis,
|
---|
902 | float &position);
|
---|
903 |
|
---|
904 | /** Evaluates the influence on the pvs of the visibility event ve.
|
---|
905 | @param ve the visibility event
|
---|
906 | @param pvsLeft updates the left pvs
|
---|
907 | @param rightPvs updates the right pvs
|
---|
908 | */
|
---|
909 | void EvalPvsIncr(const SortableEntry &ve,
|
---|
910 | int &pvsLeft,
|
---|
911 | int &pvsRight) const;
|
---|
912 |
|
---|
913 | void RemoveContriFromPvs(KdLeaf *leaf, int &pvs) const;
|
---|
914 | void AddContriToPvs(KdLeaf *leaf, int &pvs) const;
|
---|
915 |
|
---|
916 | /** Prepares objects for the heuristics.
|
---|
917 | @returns pvs size of the ray container
|
---|
918 | */
|
---|
919 | int PrepareHeuristics(const RayInfoContainer &rays);
|
---|
920 |
|
---|
921 | int PrepareHeuristics(Intersectable *object);
|
---|
922 |
|
---|
923 | /** Subdivides the rays into front and back rays according to the split plane.
|
---|
924 |
|
---|
925 | @param plane the split plane
|
---|
926 | @param rays contains the rays to be split. The rays are
|
---|
927 | distributed into front and back rays.
|
---|
928 | @param frontRays returns rays on the front side of the plane
|
---|
929 | @param backRays returns rays on the back side of the plane
|
---|
930 |
|
---|
931 | @returns the number of splits
|
---|
932 | */
|
---|
933 | int SplitRays(const AxisAlignedPlane &plane,
|
---|
934 | RayInfoContainer &rays,
|
---|
935 | RayInfoContainer &frontRays,
|
---|
936 | RayInfoContainer &backRays) const;
|
---|
937 |
|
---|
938 | /** Adds the object to the pvs of the front and back leaf with a given classification.
|
---|
939 |
|
---|
940 | @param obj the object to be added
|
---|
941 | @param cf the ray classification regarding the split plane
|
---|
942 | @param frontPvs returns the PVS of the front partition
|
---|
943 | @param backPvs returns the PVS of the back partition
|
---|
944 |
|
---|
945 | */
|
---|
946 | void AddObjToPvs(Intersectable *obj,
|
---|
947 | const int cf,
|
---|
948 | float &frontPvs,
|
---|
949 | float &backPvs,
|
---|
950 | float &totalPvs) const;
|
---|
951 |
|
---|
952 | /** Computes PVS size induced by the rays.
|
---|
953 | */
|
---|
954 | int ComputePvsSize(const RayInfoContainer &rays) const;
|
---|
955 |
|
---|
956 | /** Collects pvs from rays.
|
---|
957 | */
|
---|
958 | void CollectPvs(const RayInfoContainer &rays,
|
---|
959 | ObjectContainer &objects) const;
|
---|
960 |
|
---|
961 | /** Returns true if tree can be terminated.
|
---|
962 | */
|
---|
963 | inline bool LocalTerminationCriteriaMet(const VspTraversalData &data) const;
|
---|
964 |
|
---|
965 | /** Returns true if global tree can be terminated.
|
---|
966 | */
|
---|
967 | inline bool GlobalTerminationCriteriaMet(const VspTraversalData &data) const;
|
---|
968 |
|
---|
969 | /** Adds ray sample contributions to the PVS.
|
---|
970 | @param sampleContributions the number contributions of the samples
|
---|
971 | @param contributingSampels the number of contributing rays
|
---|
972 |
|
---|
973 | */
|
---|
974 | void AddToPvs(VspLeaf *leaf,
|
---|
975 | const RayInfoContainer &rays,
|
---|
976 | float &sampleContributions,
|
---|
977 | int &contributingSamples);
|
---|
978 |
|
---|
979 | /** Propagates valid flag up the tree.
|
---|
980 | */
|
---|
981 | void PropagateUpValidity(VspNode *node);
|
---|
982 |
|
---|
983 | /** Writes the node to disk
|
---|
984 | @note: should be implemented as visitor.
|
---|
985 | */
|
---|
986 | #if ZIPPED_VIEWCELLS
|
---|
987 | void ExportNode(VspNode *node, ogzstream &stream);
|
---|
988 | #else
|
---|
989 | void ExportNode(VspNode *node, ofstream &stream);
|
---|
990 | #endif
|
---|
991 |
|
---|
992 | /** Returns estimated memory usage of tree.
|
---|
993 | */
|
---|
994 | float GetMemUsage() const;
|
---|
995 |
|
---|
996 | void ProcessViewCellObjects(ViewCell *parent,
|
---|
997 | ViewCell *front,
|
---|
998 | ViewCell *back) const;
|
---|
999 |
|
---|
1000 | void CreateViewCell(VspTraversalData &tData);
|
---|
1001 |
|
---|
1002 | void CollectDirtyCandidates(VspSplitCandidate *sc,
|
---|
1003 | vector<SplitCandidate *> &dirtyList);
|
---|
1004 |
|
---|
1005 | protected:
|
---|
1006 |
|
---|
1007 | int mPvsCountMethod;
|
---|
1008 | enum {PER_OBJECT, PER_KDLEAF};
|
---|
1009 |
|
---|
1010 | ViewCellsManager *mViewCellsManager;
|
---|
1011 | vector<SortableEntry> *mSplitCandidates;
|
---|
1012 |
|
---|
1013 | /// Pointer to the root of the tree
|
---|
1014 | VspNode *mRoot;
|
---|
1015 |
|
---|
1016 | VspTreeStatistics mVspStats;
|
---|
1017 |
|
---|
1018 | /// View cell corresponding to the space outside the valid view space
|
---|
1019 | VspViewCell *mOutOfBoundsCell;
|
---|
1020 |
|
---|
1021 | /// box around the whole view domain
|
---|
1022 | AxisAlignedBox3 mBoundingBox;
|
---|
1023 |
|
---|
1024 |
|
---|
1025 |
|
---|
1026 | //-- local termination
|
---|
1027 |
|
---|
1028 | /// minimal number of rays before subdivision termination
|
---|
1029 | int mTermMinRays;
|
---|
1030 | /// maximal possible depth
|
---|
1031 | int mTermMaxDepth;
|
---|
1032 | /// mininum probability
|
---|
1033 | float mTermMinProbability;
|
---|
1034 | /// mininum PVS
|
---|
1035 | int mTermMinPvs;
|
---|
1036 | /// maximal contribution per ray
|
---|
1037 | float mTermMaxRayContribution;
|
---|
1038 | /// maximal acceptable cost ratio
|
---|
1039 | float mTermMaxCostRatio;
|
---|
1040 | /// tolerance value indicating how often the max cost ratio can be failed
|
---|
1041 | int mTermMissTolerance;
|
---|
1042 |
|
---|
1043 |
|
---|
1044 | //-- global criteria
|
---|
1045 | float mTermMinGlobalCostRatio;
|
---|
1046 | int mTermGlobalCostMissTolerance;
|
---|
1047 | int mGlobalCostMisses;
|
---|
1048 |
|
---|
1049 | /// maximal number of view cells
|
---|
1050 | int mMaxViewCells;
|
---|
1051 | /// maximal tree memory
|
---|
1052 | float mMaxMemory;
|
---|
1053 | /// the tree is out of memory
|
---|
1054 | bool mOutOfMemory;
|
---|
1055 |
|
---|
1056 |
|
---|
1057 |
|
---|
1058 | //-- split heuristics based parameters
|
---|
1059 |
|
---|
1060 | bool mUseCostHeuristics;
|
---|
1061 | /// balancing factor for PVS criterium
|
---|
1062 | float mCtDivCi;
|
---|
1063 | /// if only driving axis should be used for split
|
---|
1064 | bool mOnlyDrivingAxis;
|
---|
1065 | /// if random split axis should be used
|
---|
1066 | bool mUseRandomAxis;
|
---|
1067 | /// if vsp bsp tree should simulate octree
|
---|
1068 | bool mCirculatingAxis;
|
---|
1069 | /// minimal relative position where the split axis can be placed
|
---|
1070 | float mMinBand;
|
---|
1071 | /// maximal relative position where the split axis can be placed
|
---|
1072 | float mMaxBand;
|
---|
1073 |
|
---|
1074 |
|
---|
1075 | /// current time stamp (used for keeping split history)
|
---|
1076 | int mTimeStamp;
|
---|
1077 | // if rays should be stored in leaves
|
---|
1078 | bool mStoreRays;
|
---|
1079 |
|
---|
1080 | /// epsilon for geometric comparisons
|
---|
1081 | float mEpsilon;
|
---|
1082 |
|
---|
1083 |
|
---|
1084 | /// subdivision stats output file
|
---|
1085 | ofstream mSubdivisionStats;
|
---|
1086 | /// keeps track of cost during subdivision
|
---|
1087 | float mTotalCost;
|
---|
1088 | /// keeps track of overall pvs size during subdivision
|
---|
1089 | int mTotalPvsSize;
|
---|
1090 | /// number of currenly generated view cells
|
---|
1091 | int mCreatedViewCells;
|
---|
1092 |
|
---|
1093 | /// weight between render cost decrease and node render cost
|
---|
1094 | float mRenderCostDecreaseWeight;
|
---|
1095 | };
|
---|
1096 |
|
---|
1097 |
|
---|
1098 | /** View Space Partitioning tree.
|
---|
1099 | */
|
---|
1100 | class OspTree
|
---|
1101 | {
|
---|
1102 | friend class ViewCellsParseHandlers;
|
---|
1103 | friend class HierarchyManager;
|
---|
1104 |
|
---|
1105 | public:
|
---|
1106 |
|
---|
1107 | /** Additional data which is passed down the BSP tree during traversal.
|
---|
1108 | */
|
---|
1109 | class OspTraversalData
|
---|
1110 | {
|
---|
1111 | public:
|
---|
1112 | /// the current node
|
---|
1113 | KdLeaf *mNode;
|
---|
1114 | /// current depth
|
---|
1115 | int mDepth;
|
---|
1116 | /// rays piercing this node
|
---|
1117 | //RayInfoContainer *mRays;
|
---|
1118 | /// the probability that this node contains view point
|
---|
1119 | float mProbability;
|
---|
1120 | /// the bounding box of the node
|
---|
1121 | AxisAlignedBox3 mBoundingBox;
|
---|
1122 | /// pvs size
|
---|
1123 | int mPvs;
|
---|
1124 | /// how often this branch has missed the max-cost ratio
|
---|
1125 | int mMaxCostMisses;
|
---|
1126 | // current axis
|
---|
1127 | int mAxis;
|
---|
1128 | // current priority
|
---|
1129 | float mPriority;
|
---|
1130 |
|
---|
1131 |
|
---|
1132 | OspTraversalData():
|
---|
1133 | mNode(NULL),
|
---|
1134 | mDepth(0),
|
---|
1135 | mPvs(0),
|
---|
1136 | mProbability(0.0),
|
---|
1137 | mMaxCostMisses(0),
|
---|
1138 | mPriority(0),
|
---|
1139 | mAxis(0)
|
---|
1140 | {}
|
---|
1141 |
|
---|
1142 | OspTraversalData(KdLeaf *node,
|
---|
1143 | const int depth,
|
---|
1144 | const int pvs,
|
---|
1145 | const float p,
|
---|
1146 | const AxisAlignedBox3 &box):
|
---|
1147 | mNode(node),
|
---|
1148 | mDepth(depth),
|
---|
1149 | mPvs(pvs),
|
---|
1150 | mProbability(p),
|
---|
1151 | mBoundingBox(box),
|
---|
1152 | mMaxCostMisses(0),
|
---|
1153 | mPriority(0),
|
---|
1154 | mAxis(0)
|
---|
1155 | {}
|
---|
1156 |
|
---|
1157 | OspTraversalData(const int depth,
|
---|
1158 | const AxisAlignedBox3 &box):
|
---|
1159 | mNode(NULL),
|
---|
1160 | mDepth(depth),
|
---|
1161 | mPvs(0),
|
---|
1162 | mProbability(0),
|
---|
1163 | mMaxCostMisses(0),
|
---|
1164 | mAxis(0),
|
---|
1165 | mBoundingBox(box)
|
---|
1166 | {}
|
---|
1167 |
|
---|
1168 | /** Returns cost of the traversal data.
|
---|
1169 | */
|
---|
1170 | float GetCost() const
|
---|
1171 | {
|
---|
1172 | //cout << mPriority << endl;
|
---|
1173 | return mPriority;
|
---|
1174 | }
|
---|
1175 |
|
---|
1176 | // deletes contents and sets them to NULL
|
---|
1177 | void Clear()
|
---|
1178 | {
|
---|
1179 | }
|
---|
1180 |
|
---|
1181 | friend bool operator<(const OspTraversalData &a, const OspTraversalData &b)
|
---|
1182 | {
|
---|
1183 | return a.GetCost() < b.GetCost();
|
---|
1184 | }
|
---|
1185 | };
|
---|
1186 |
|
---|
1187 | /** Candidate for a view space split.
|
---|
1188 | */
|
---|
1189 | class OspSplitCandidate: public SplitCandidate
|
---|
1190 | {
|
---|
1191 | public:
|
---|
1192 | static OspTree* sOspTree;
|
---|
1193 |
|
---|
1194 | /// parent data
|
---|
1195 | OspTraversalData mParentData;
|
---|
1196 |
|
---|
1197 | OspSplitCandidate(const OspTraversalData &tData): mParentData(tData)
|
---|
1198 | {};
|
---|
1199 |
|
---|
1200 | int Type() const { return OBJECT_SPACE; }
|
---|
1201 |
|
---|
1202 | void EvalPriority()
|
---|
1203 | {
|
---|
1204 | sOspTree->EvalSplitCandidate(*this);
|
---|
1205 | }
|
---|
1206 |
|
---|
1207 | bool GlobalTerminationCriteriaMet() const
|
---|
1208 | {
|
---|
1209 | return sOspTree->GlobalTerminationCriteriaMet(mParentData);
|
---|
1210 | }
|
---|
1211 |
|
---|
1212 |
|
---|
1213 | OspSplitCandidate(const AxisAlignedPlane &plane, const OspTraversalData &tData):
|
---|
1214 | SplitCandidate(plane), mParentData(tData)
|
---|
1215 | {}
|
---|
1216 | };
|
---|
1217 |
|
---|
1218 | /** Struct for traversing line segment.
|
---|
1219 | */
|
---|
1220 | struct LineTraversalData
|
---|
1221 | {
|
---|
1222 | KdNode *mNode;
|
---|
1223 | Vector3 mExitPoint;
|
---|
1224 |
|
---|
1225 | float mMaxT;
|
---|
1226 |
|
---|
1227 | LineTraversalData () {}
|
---|
1228 | LineTraversalData (KdNode *n, const Vector3 &p, const float maxt):
|
---|
1229 | mNode(n), mExitPoint(p), mMaxT(maxt) {}
|
---|
1230 | };
|
---|
1231 |
|
---|
1232 | //typedef std::priority_queue<VspTraversalData> VspOspTraversalQueue;
|
---|
1233 |
|
---|
1234 | /** Default constructor creating an empty tree.
|
---|
1235 | */
|
---|
1236 | OspTree();
|
---|
1237 |
|
---|
1238 | /** Default destructor.
|
---|
1239 | */
|
---|
1240 | ~OspTree();
|
---|
1241 |
|
---|
1242 | /** Returns tree statistics.
|
---|
1243 | */
|
---|
1244 | const OspTreeStatistics &GetStatistics() const;
|
---|
1245 |
|
---|
1246 | /** Returns bounding box of the specified node.
|
---|
1247 | */
|
---|
1248 | AxisAlignedBox3 GetBBox(KdNode *node) const;
|
---|
1249 |
|
---|
1250 | /** Returns list of leaves with pvs smaller than
|
---|
1251 | a certain threshold.
|
---|
1252 | @param onlyUnmailed if only the unmailed leaves should be considered
|
---|
1253 | @param maxPvs the maximal pvs of a leaf to be added (-1 means unlimited)
|
---|
1254 | */
|
---|
1255 |
|
---|
1256 | void CollectLeaves(vector<KdLeaf *> &leaves) const;
|
---|
1257 |
|
---|
1258 |
|
---|
1259 | /** Returns bounding box of the whole tree (= bbox of root node)
|
---|
1260 | */
|
---|
1261 | AxisAlignedBox3 GetBoundingBox()const;
|
---|
1262 |
|
---|
1263 | /** Returns root of the view space partitioning tree.
|
---|
1264 | */
|
---|
1265 | KdNode *GetRoot() const;
|
---|
1266 |
|
---|
1267 | /** Collects the leaf view cells of the tree
|
---|
1268 | @param viewCells returns the view cells
|
---|
1269 | */
|
---|
1270 | void CollectViewCells(ViewCellContainer &viewCells, bool onlyValid) const;
|
---|
1271 |
|
---|
1272 | /** A ray is cast possible intersecting the tree.
|
---|
1273 | @param the ray that is cast.
|
---|
1274 | @returns the number of intersections with objects stored in the tree.
|
---|
1275 | */
|
---|
1276 | int CastRay(Ray &ray);
|
---|
1277 |
|
---|
1278 | /** finds neighbouring leaves of this tree node.
|
---|
1279 | */
|
---|
1280 | int FindNeighbors(KdLeaf *n,
|
---|
1281 | vector<VspLeaf *> &neighbors,
|
---|
1282 | const bool onlyUnmailed) const;
|
---|
1283 |
|
---|
1284 | /** Returns random leaf of BSP tree.
|
---|
1285 | @param halfspace defines the halfspace from which the leaf is taken.
|
---|
1286 | */
|
---|
1287 | KdLeaf *GetRandomLeaf(const Plane3 &halfspace);
|
---|
1288 |
|
---|
1289 | /** Returns random leaf of BSP tree.
|
---|
1290 | @param onlyUnmailed if only unmailed leaves should be returned.
|
---|
1291 | */
|
---|
1292 | KdLeaf *GetRandomLeaf(const bool onlyUnmailed = false);
|
---|
1293 |
|
---|
1294 | /** Returns epsilon of this tree.
|
---|
1295 | */
|
---|
1296 | float GetEpsilon() const;
|
---|
1297 |
|
---|
1298 | /** Casts line segment into the tree.
|
---|
1299 | @param origin the origin of the line segment
|
---|
1300 | @param termination the end point of the line segment
|
---|
1301 | @returns view cells intersecting the line segment.
|
---|
1302 | */
|
---|
1303 | int CastLineSegment(const Vector3 &origin,
|
---|
1304 | const Vector3 &termination,
|
---|
1305 | ViewCellContainer &viewcells);
|
---|
1306 |
|
---|
1307 | /** Sets pointer to view cells manager.
|
---|
1308 | */
|
---|
1309 | void SetViewCellsManager(ViewCellsManager *vcm);
|
---|
1310 |
|
---|
1311 | /** Writes tree to output stream
|
---|
1312 | */
|
---|
1313 | #if ZIPPED_VIEWCELLS
|
---|
1314 | bool Export(ogzstream &stream);
|
---|
1315 | #else
|
---|
1316 | bool Export(ofstream &stream);
|
---|
1317 | #endif
|
---|
1318 |
|
---|
1319 | /** Collects rays stored in the leaves.
|
---|
1320 | */
|
---|
1321 | void CollectRays(VssRayContainer &rays);
|
---|
1322 |
|
---|
1323 | /** Intersects box with the tree and returns the number of intersected boxes.
|
---|
1324 | @returns number of view cells found
|
---|
1325 | */
|
---|
1326 | int ComputeBoxIntersections(const AxisAlignedBox3 &box,
|
---|
1327 | ViewCellContainer &viewCells) const;
|
---|
1328 |
|
---|
1329 |
|
---|
1330 | /** Compute "pvs size of this object container
|
---|
1331 | @ note bot relly pvs size just weighted sum of object taking their
|
---|
1332 | appearances in pvss into account
|
---|
1333 | */
|
---|
1334 | int ComputePvsSize(const ObjectContainer &objects) const;
|
---|
1335 |
|
---|
1336 |
|
---|
1337 | /// pointer to the hierarchy of view cells
|
---|
1338 | ViewCellsTree *mViewCellsTree;
|
---|
1339 |
|
---|
1340 |
|
---|
1341 | protected:
|
---|
1342 |
|
---|
1343 | // --------------------------------------------------------------
|
---|
1344 | // For sorting objects
|
---|
1345 | // --------------------------------------------------------------
|
---|
1346 | struct SortableEntry
|
---|
1347 | {
|
---|
1348 | enum
|
---|
1349 | {
|
---|
1350 | BOX_MIN,
|
---|
1351 | BOX_MAX
|
---|
1352 | };
|
---|
1353 |
|
---|
1354 | int type;
|
---|
1355 | float value;
|
---|
1356 | Intersectable *mObject;
|
---|
1357 |
|
---|
1358 | SortableEntry() {}
|
---|
1359 |
|
---|
1360 | SortableEntry(const int t, const float v, Intersectable *obj):
|
---|
1361 | type(t), value(v), mObject(obj)
|
---|
1362 | {}
|
---|
1363 |
|
---|
1364 | bool operator<(const SortableEntry &b) const
|
---|
1365 | {
|
---|
1366 | return value < b.value;
|
---|
1367 | }
|
---|
1368 | };
|
---|
1369 |
|
---|
1370 |
|
---|
1371 | /** faster evaluation of split plane cost for kd axis aligned cells.
|
---|
1372 | */
|
---|
1373 | float EvalLocalSplitCost(const OspTraversalData &data,
|
---|
1374 | const AxisAlignedBox3 &box,
|
---|
1375 | const int axis,
|
---|
1376 | const float &position,
|
---|
1377 | float &pFront,
|
---|
1378 | float &pBack) const;
|
---|
1379 |
|
---|
1380 | /** Evaluates candidate for splitting.
|
---|
1381 | */
|
---|
1382 | void EvalSplitCandidate(OspSplitCandidate &splitData);
|
---|
1383 |
|
---|
1384 | /** Computes priority of the traversal data and stores it in tData.
|
---|
1385 | */
|
---|
1386 | void EvalPriority(OspTraversalData &tData) const;
|
---|
1387 |
|
---|
1388 | /** Evaluates render cost decrease of next split.
|
---|
1389 | */
|
---|
1390 | float EvalRenderCostDecrease(const AxisAlignedPlane &candidatePlane,
|
---|
1391 | const OspTraversalData &data) const;
|
---|
1392 |
|
---|
1393 | float EvalViewCellPvsIncr(Intersectable *object) const;
|
---|
1394 |
|
---|
1395 |
|
---|
1396 | /** Collects view cells in the subtree under root.
|
---|
1397 | */
|
---|
1398 | void CollectViewCells(KdNode *root,
|
---|
1399 | bool onlyValid,
|
---|
1400 | ViewCellContainer &viewCells,
|
---|
1401 | bool onlyUnmailed = false) const;
|
---|
1402 |
|
---|
1403 | /** Evaluates tree stats in the BSP tree leafs.
|
---|
1404 | */
|
---|
1405 | void EvaluateLeafStats(const OspTraversalData &data);
|
---|
1406 |
|
---|
1407 | /** Subdivides node using a best split priority queue.
|
---|
1408 | @param tQueue the best split priority queue
|
---|
1409 | @param splitCandidate the candidate for the next split
|
---|
1410 | @param globalCriteriaMet if the global termination criteria were already met
|
---|
1411 | @returns new root of the subtree
|
---|
1412 | */
|
---|
1413 | KdNode *Subdivide(SplitQueue &tQueue,
|
---|
1414 | OspSplitCandidate &splitCandidate,
|
---|
1415 | const bool globalCriteriaMet);
|
---|
1416 |
|
---|
1417 | /** Subdivides leaf.
|
---|
1418 | @param leaf the leaf to be subdivided
|
---|
1419 |
|
---|
1420 | @param polys the polygons to be split
|
---|
1421 | @param frontPolys returns the polygons in front of the split plane
|
---|
1422 | @param backPolys returns the polygons in the back of the split plane
|
---|
1423 |
|
---|
1424 | @param rays the polygons to be filtered
|
---|
1425 | @param frontRays returns the polygons in front of the split plane
|
---|
1426 | @param backRays returns the polygons in the back of the split plane
|
---|
1427 |
|
---|
1428 | @returns the root of the subdivision
|
---|
1429 | */
|
---|
1430 | KdInterior *SubdivideNode(
|
---|
1431 | const AxisAlignedPlane &splitPlane,
|
---|
1432 | const OspTraversalData &tData,
|
---|
1433 | OspTraversalData &frontData,
|
---|
1434 | OspTraversalData &backData);
|
---|
1435 |
|
---|
1436 | void SplitObjects(const AxisAlignedPlane & splitPlane,
|
---|
1437 | const ObjectContainer &objects,
|
---|
1438 | ObjectContainer &front,
|
---|
1439 | ObjectContainer &back);
|
---|
1440 |
|
---|
1441 | /** does some post processing on the objects in the new child leaves.
|
---|
1442 | */
|
---|
1443 | void ProcessLeafObjects(KdLeaf *parent, KdLeaf *front, KdLeaf *back) const;
|
---|
1444 |
|
---|
1445 | /** Selects an axis aligned for the next split.
|
---|
1446 | @returns cost for this split
|
---|
1447 | */
|
---|
1448 | float SelectPlane(const OspTraversalData &tData,
|
---|
1449 | AxisAlignedPlane &plane,
|
---|
1450 | float &pFront,
|
---|
1451 | float &pBack);
|
---|
1452 |
|
---|
1453 | /** Sorts split candidates for cost heuristics using axis aligned splits.
|
---|
1454 | @param node the current node
|
---|
1455 | @param axis the current split axis
|
---|
1456 | */
|
---|
1457 | void SortSplitCandidates(KdLeaf *node, const int axis);
|
---|
1458 |
|
---|
1459 | /** Computes best cost for axis aligned planes.
|
---|
1460 | */
|
---|
1461 | float EvalLocalCostHeuristics(KdLeaf *node,
|
---|
1462 | const AxisAlignedBox3 &box,
|
---|
1463 | const int axis,
|
---|
1464 | float &position,
|
---|
1465 | int &objectsFront,
|
---|
1466 | int &objectsBack);
|
---|
1467 |
|
---|
1468 | /** Subdivides the rays into front and back rays according to the split plane.
|
---|
1469 |
|
---|
1470 | @param plane the split plane
|
---|
1471 | @param rays contains the rays to be split. The rays are
|
---|
1472 | distributed into front and back rays.
|
---|
1473 | @param frontRays returns rays on the front side of the plane
|
---|
1474 | @param backRays returns rays on the back side of the plane
|
---|
1475 |
|
---|
1476 | @returns the number of splits
|
---|
1477 | */
|
---|
1478 | int SplitRays(const AxisAlignedPlane &plane,
|
---|
1479 | RayInfoContainer &rays,
|
---|
1480 | RayInfoContainer &frontRays,
|
---|
1481 | RayInfoContainer &backRays) const;
|
---|
1482 |
|
---|
1483 | /** Adds the object to the pvs of the front and back leaf with a given classification.
|
---|
1484 |
|
---|
1485 | @param obj the object to be added
|
---|
1486 | @param cf the ray classification regarding the split plane
|
---|
1487 | @param frontPvs returns the PVS of the front partition
|
---|
1488 | @param backPvs returns the PVS of the back partition
|
---|
1489 |
|
---|
1490 | */
|
---|
1491 | void AddObjToPvs(Intersectable *obj,
|
---|
1492 | const int cf,
|
---|
1493 | float &frontPvs,
|
---|
1494 | float &backPvs,
|
---|
1495 | float &totalPvs) const;
|
---|
1496 |
|
---|
1497 | /** Returns true if tree can be terminated.
|
---|
1498 | */
|
---|
1499 | inline bool LocalTerminationCriteriaMet(const OspTraversalData &data) const;
|
---|
1500 |
|
---|
1501 | /** Returns true if global tree can be terminated.
|
---|
1502 | */
|
---|
1503 | inline bool GlobalTerminationCriteriaMet(const OspTraversalData &data) const;
|
---|
1504 |
|
---|
1505 | float SelectSplitPlane(const OspTraversalData &tData,
|
---|
1506 | AxisAlignedPlane &plane,
|
---|
1507 | float &pFront,
|
---|
1508 | float &pBack);
|
---|
1509 | /** Adds ray sample contributions to the PVS.
|
---|
1510 | @param sampleContributions the number contributions of the samples
|
---|
1511 | @param contributingSampels the number of contributing rays
|
---|
1512 |
|
---|
1513 | */
|
---|
1514 | void AddToPvs(VspLeaf *leaf,
|
---|
1515 | const RayInfoContainer &rays,
|
---|
1516 | float &sampleContributions,
|
---|
1517 | int &contributingSamples);
|
---|
1518 |
|
---|
1519 | /** Propagates valid flag up the tree.
|
---|
1520 | */
|
---|
1521 | void PropagateUpValidity(KdNode *node);
|
---|
1522 |
|
---|
1523 | /** Writes the node to disk
|
---|
1524 | @note: should be implemented as visitor.
|
---|
1525 | */
|
---|
1526 | #if ZIPPED_VIEWCELLS
|
---|
1527 | void ExportNode(KdNode *node, ogzstream &stream);
|
---|
1528 | #else
|
---|
1529 | void ExportNode(KdNode *node, ofstream &stream);
|
---|
1530 | #endif
|
---|
1531 |
|
---|
1532 | /** Returns estimated memory usage of tree.
|
---|
1533 | */
|
---|
1534 | float GetMemUsage() const;
|
---|
1535 |
|
---|
1536 | /** Evaluates the influence on the pvs of the visibility event ve.
|
---|
1537 | @param ve the visibility event
|
---|
1538 | @param pvsLeft updates the left pvs
|
---|
1539 | @param rightPvs updates the right pvs
|
---|
1540 | */
|
---|
1541 | void EvalPvsIncr(const SortableEntry &ve,
|
---|
1542 | int &pvsLeft,
|
---|
1543 | int &pvsRight) const;
|
---|
1544 |
|
---|
1545 | void RemoveContriFromPvs(Intersectable *object, int &pvs) const;
|
---|
1546 | void AddContriToPvs(Intersectable *object, int &pvs) const;
|
---|
1547 |
|
---|
1548 | /** Prepares objects for the cost heuristics.
|
---|
1549 | @returns pvs size of the node
|
---|
1550 | */
|
---|
1551 | int PrepareHeuristics(const ObjectContainer &objects);
|
---|
1552 |
|
---|
1553 | int PrepareHeuristics(Intersectable *object);
|
---|
1554 |
|
---|
1555 | void PrepareConstruction(const ObjectContainer &objects,
|
---|
1556 | AxisAlignedBox3 *forcedBoundingBox);
|
---|
1557 |
|
---|
1558 | void CollectDirtyCandidates(OspSplitCandidate *sc,
|
---|
1559 | vector<SplitCandidate *> &dirtyList);
|
---|
1560 |
|
---|
1561 | void CollectViewCells(KdLeaf *leaf,
|
---|
1562 | ViewCellContainer &viewCells);
|
---|
1563 |
|
---|
1564 | protected:
|
---|
1565 |
|
---|
1566 | /// The view cells manager
|
---|
1567 | ViewCellsManager *mViewCellsManager;
|
---|
1568 |
|
---|
1569 | /// candidates for placing split planes during cost heuristics
|
---|
1570 | vector<SortableEntry> *mSplitCandidates;
|
---|
1571 |
|
---|
1572 | /// Pointer to the root of the tree
|
---|
1573 | KdNode *mRoot;
|
---|
1574 |
|
---|
1575 | /// Statistics for the object space partition
|
---|
1576 | OspTreeStatistics mOspStats;
|
---|
1577 |
|
---|
1578 | /// box around the whole view domain
|
---|
1579 | AxisAlignedBox3 mBoundingBox;
|
---|
1580 |
|
---|
1581 |
|
---|
1582 | //-- local termination
|
---|
1583 |
|
---|
1584 | /// maximal possible depth
|
---|
1585 | int mTermMaxDepth;
|
---|
1586 | /// mininum probability
|
---|
1587 | float mTermMinProbability;
|
---|
1588 | /// minimal number of objects
|
---|
1589 | int mTermMinObjects;
|
---|
1590 | /// maximal contribution per ray
|
---|
1591 | float mTermMaxRayContribution;
|
---|
1592 | /// maximal acceptable cost ratio
|
---|
1593 | float mTermMaxCostRatio;
|
---|
1594 | /// tolerance value indicating how often the max cost ratio can be failed
|
---|
1595 | int mTermMissTolerance;
|
---|
1596 |
|
---|
1597 |
|
---|
1598 |
|
---|
1599 | //-- global criteria
|
---|
1600 |
|
---|
1601 | float mTermMinGlobalCostRatio;
|
---|
1602 | int mTermGlobalCostMissTolerance;
|
---|
1603 | int mGlobalCostMisses;
|
---|
1604 |
|
---|
1605 | /// maximal number of view cells
|
---|
1606 | int mTermMaxLeaves;
|
---|
1607 | /// maximal tree memory
|
---|
1608 | float mMaxMemory;
|
---|
1609 | /// the tree is out of memory
|
---|
1610 | bool mOutOfMemory;
|
---|
1611 |
|
---|
1612 |
|
---|
1613 |
|
---|
1614 | //-- split heuristics based parameters
|
---|
1615 |
|
---|
1616 | bool mUseCostHeuristics;
|
---|
1617 | /// balancing factor for PVS criterium
|
---|
1618 | float mCtDivCi;
|
---|
1619 | /// if only driving axis should be used for split
|
---|
1620 | bool mOnlyDrivingAxis;
|
---|
1621 |
|
---|
1622 | /// current time stamp (used for keeping split history)
|
---|
1623 | int mTimeStamp;
|
---|
1624 | // if rays should be stored in leaves
|
---|
1625 | bool mStoreRays;
|
---|
1626 |
|
---|
1627 | /// epsilon for geometric comparisons
|
---|
1628 | float mEpsilon;
|
---|
1629 |
|
---|
1630 |
|
---|
1631 | /// subdivision stats output file
|
---|
1632 | ofstream mSubdivisionStats;
|
---|
1633 | /// keeps track of cost during subdivision
|
---|
1634 | float mTotalCost;
|
---|
1635 | /// keeps track of overall pvs size during subdivision
|
---|
1636 | int mTotalPvsSize;
|
---|
1637 | /// number of currenly generated view cells
|
---|
1638 | int mCreatedLeaves;
|
---|
1639 |
|
---|
1640 | /// represents min and max band for sweep
|
---|
1641 | float mSplitBorder;
|
---|
1642 |
|
---|
1643 | /// weight between render cost decrease and node render cost
|
---|
1644 | float mRenderCostDecreaseWeight;
|
---|
1645 | };
|
---|
1646 |
|
---|
1647 |
|
---|
1648 | /** This class implements a structure holding two different hierarchies,
|
---|
1649 | one for object space partitioning and one for view space partitioning.
|
---|
1650 |
|
---|
1651 | The object space and the view space are subdivided using a cost heuristics.
|
---|
1652 | If an object space split or a view space split is chosen is also evaluated
|
---|
1653 | based on the heuristics.
|
---|
1654 |
|
---|
1655 | The view space heuristics is evaluated by weighting and adding the pvss of the back and
|
---|
1656 | front node of each specific split. unlike for the standalone method vspbsp tree,
|
---|
1657 | the pvs of an object would not be the pvs of single object but that of all objects
|
---|
1658 | which are contained in the same leaf of the object subdivision. This could be done
|
---|
1659 | by storing the pointer to the object space partition parent, which would allow access to all children.
|
---|
1660 | Another possibility is to include traced kd-cells in the ray casing process.
|
---|
1661 |
|
---|
1662 | Accordingly, the object space heuristics is evaluated by storing a pvs of view cells with each object.
|
---|
1663 | the contribution to an object to the pvs is the number of view cells it can be seen from.
|
---|
1664 |
|
---|
1665 | @note
|
---|
1666 | There is a potential efficiency problem involved in a sense that once a certain type
|
---|
1667 | of split is chosen for view space / object space, the candidates for the next split of
|
---|
1668 | object space / view space must be reevaluated.
|
---|
1669 |
|
---|
1670 | */
|
---|
1671 | class HierarchyManager
|
---|
1672 | {
|
---|
1673 | public:
|
---|
1674 | /** Constructor taking an object space partition and a view space partition tree.
|
---|
1675 | */
|
---|
1676 | HierarchyManager(VspTree &vspTree, OspTree &ospTree);
|
---|
1677 |
|
---|
1678 | /** Constructs the view space and object space subdivision from a given set of rays
|
---|
1679 | and a set of objects.
|
---|
1680 | @param sampleRays the set of sample rays the construction is based on
|
---|
1681 | @param objects the set of objects
|
---|
1682 | */
|
---|
1683 | void Construct(const VssRayContainer &sampleRays,
|
---|
1684 | const ObjectContainer &objects,
|
---|
1685 | AxisAlignedBox3 *forcedViewSpace);
|
---|
1686 |
|
---|
1687 | /** Constructs first view cells, then object space partition.
|
---|
1688 | */
|
---|
1689 | void Construct2(const VssRayContainer &sampleRays,
|
---|
1690 | const ObjectContainer &objects,
|
---|
1691 | AxisAlignedBox3 *forcedViewSpace);
|
---|
1692 |
|
---|
1693 | public:
|
---|
1694 | VspTree &mVspTree;
|
---|
1695 | OspTree &mOspTree;
|
---|
1696 |
|
---|
1697 | protected:
|
---|
1698 |
|
---|
1699 | bool GlobalTerminationCriteriaMet(SplitCandidate *candidate) const;
|
---|
1700 |
|
---|
1701 | void PrepareConstruction(const VssRayContainer &sampleRays,
|
---|
1702 | const ObjectContainer &objects,
|
---|
1703 | AxisAlignedBox3 *forcedViewSpace,
|
---|
1704 | RayInfoContainer &rays);
|
---|
1705 |
|
---|
1706 | bool FinishedConstruction();
|
---|
1707 |
|
---|
1708 | SplitCandidate *NextSplitCandidate();
|
---|
1709 |
|
---|
1710 | void RepairQueue();
|
---|
1711 |
|
---|
1712 | void CollectDirtyCandidates(vector<SplitCandidate *> &dirtyList);
|
---|
1713 |
|
---|
1714 | void PrepareVsp(const VssRayContainer &sampleRays,
|
---|
1715 | AxisAlignedBox3 *forcedViewSpace,
|
---|
1716 | RayInfoContainer &rays);
|
---|
1717 |
|
---|
1718 | void PrepareOsp(const ObjectContainer &objects, AxisAlignedBox3 *forcedViewSpace);
|
---|
1719 |
|
---|
1720 | void ProcessRays(const VssRayContainer &sampleRays,
|
---|
1721 | RayInfoContainer &rays,
|
---|
1722 | ObjectContainer &sampledObjects);
|
---|
1723 |
|
---|
1724 |
|
---|
1725 | protected:
|
---|
1726 |
|
---|
1727 | AxisAlignedBox3 mBoundingBox;
|
---|
1728 |
|
---|
1729 | SplitQueue mTQueue;
|
---|
1730 |
|
---|
1731 | SplitCandidate *mCurrentCandidate;
|
---|
1732 |
|
---|
1733 | //-- global criteria
|
---|
1734 | float mTermMinGlobalCostRatio;
|
---|
1735 | int mTermGlobalCostMissTolerance;
|
---|
1736 | int mGlobalCostMisses;
|
---|
1737 |
|
---|
1738 | /// keeps track of cost during subdivision
|
---|
1739 | float mTotalCost;
|
---|
1740 | };
|
---|
1741 |
|
---|
1742 | }
|
---|
1743 |
|
---|
1744 | #endif
|
---|