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