1 | #ifndef _VspTree_H__
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2 | #define _VspTree_H__
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3 |
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4 | #include <stack>
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5 |
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6 | #include "Mesh.h"
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7 | #include "Containers.h"
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8 | #include "Statistics.h"
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9 | #include "VssRay.h"
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10 | #include "RayInfo.h"
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11 | #include "gzstream.h"
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12 | #include "SubdivisionCandidate.h"
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13 |
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14 |
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15 | namespace GtpVisibilityPreprocessor {
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16 |
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17 | class ViewCellLeaf;
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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 | class HierarchyManager;
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34 | class KdIntersectable;
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35 | class KdTree;
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36 | class VspTree;
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37 | class KdTreeStatistics;
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38 | //class SubdivisionCandidate;
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39 | //class VspSubdivisionCandidate;
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40 |
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41 | /** View space partition statistics.
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42 | */
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43 | class VspTreeStatistics: public StatisticsBase
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44 | {
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45 | public:
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46 | // total number of nodes
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47 | int nodes;
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48 | // number of splits
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49 | int splits[3];
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50 |
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51 | // totals number of rays
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52 | int rays;
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53 | // maximal reached depth
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54 | int maxDepth;
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55 | // minimal depth
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56 | int minDepth;
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57 |
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58 | // max depth nodes
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59 | int maxDepthNodes;
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60 | // minimum depth nodes
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61 | int minDepthNodes;
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62 | // max depth nodes
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63 | int minPvsNodes;
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64 | // nodes with minimum PVS
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65 | int minRaysNodes;
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66 | // max ray contribution nodes
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67 | int maxRayContribNodes;
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68 | // minimum area nodes
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69 | int minProbabilityNodes;
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70 | /// nodes termination because of max cost ratio;
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71 | int maxCostNodes;
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72 | // max number of rays per node
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73 | int maxObjectRefs;
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74 | /// samples contributing to pvs
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75 | int contributingSamples;
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76 | /// sample contributions to pvs
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77 | int sampleContributions;
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78 | /// largest pvs
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79 | int maxPvs;
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80 | /// number of invalid leaves
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81 | int invalidLeaves;
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82 | /// accumulated number of rays refs
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83 | int accumRays;
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84 | int pvs;
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85 | // accumulated depth (used to compute average)
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86 | int accumDepth;
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87 |
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88 | // Constructor
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89 | VspTreeStatistics()
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90 | {
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91 | Reset();
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92 | }
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93 |
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94 | int Nodes() const {return nodes;}
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95 | int Interior() const { return nodes / 2; }
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96 | int Leaves() const { return (nodes / 2) + 1; }
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97 |
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98 | // TODO: computation wrong
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99 | double AvgDepth() const { return accumDepth / (double)Leaves();};
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100 | double AvgRays() const { return accumRays / (double)Leaves();};
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101 |
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102 | void Reset()
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103 | {
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104 | nodes = 0;
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105 | for (int i = 0; i < 3; ++ i)
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106 | splits[i] = 0;
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107 |
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108 | maxDepth = 0;
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109 | minDepth = 99999;
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110 | accumDepth = 0;
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111 | pvs = 0;
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112 | maxDepthNodes = 0;
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113 | minPvsNodes = 0;
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114 | minRaysNodes = 0;
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115 | maxRayContribNodes = 0;
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116 | minProbabilityNodes = 0;
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117 | maxCostNodes = 0;
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118 |
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119 | contributingSamples = 0;
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120 | sampleContributions = 0;
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121 |
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122 | maxPvs = 0;
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123 | invalidLeaves = 0;
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124 | accumRays = 0;
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125 | maxObjectRefs = 0;
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126 | }
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127 |
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128 | void Print(ostream &app) const;
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129 |
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130 | friend ostream &operator<<(ostream &s, const VspTreeStatistics &stat)
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131 | {
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132 | stat.Print(s);
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133 | return s;
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134 | }
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135 | };
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136 |
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137 |
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138 | /**
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139 | VspNode abstract class serving for interior and leaf node implementation
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140 | */
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141 | class VspNode
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142 | {
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143 | public:
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144 |
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145 | // types of vsp nodes
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146 | enum {Interior, Leaf};
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147 |
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148 | VspNode();
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149 | virtual ~VspNode(){};
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150 | VspNode(VspInterior *parent);
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151 |
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152 | /** Determines whether this node is a leaf or not
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153 | @return true if leaf
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154 | */
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155 | virtual bool IsLeaf() const = 0;
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156 |
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157 | virtual int Type() const = 0;
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158 |
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159 | /** Determines whether this node is a root
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160 | @return true if root
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161 | */
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162 | virtual bool IsRoot() const;
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163 | /** Returns parent node.
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164 | */
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165 | VspInterior *GetParent();
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166 | /** Sets parent node.
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167 | */
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168 | void SetParent(VspInterior *parent);
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169 | /** Returns true if this node is a sibling of node n.
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170 | */
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171 | bool IsSibling(VspNode *n) const;
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172 | /** returns depth of the node.
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173 | */
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174 | int GetDepth() const;
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175 | /** returns true if the whole subtree is valid
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176 | */
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177 | bool TreeValid() const;
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178 |
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179 | void SetTreeValid(const bool v);
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180 |
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181 | //-- mailing options
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182 |
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183 | void Mail() { mMailbox = sMailId; }
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184 | static void NewMail() { ++ sMailId; }
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185 | bool Mailed() const { return mMailbox == sMailId; }
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186 |
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187 |
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188 | static int sMailId;
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189 | int mMailbox;
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190 |
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191 | int mTimeStamp;
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192 |
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193 | protected:
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194 |
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195 | /// if this sub tree is a completely valid view space region
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196 | bool mTreeValid;
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197 | /// parent of this node
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198 | VspInterior *mParent;
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199 | };
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200 |
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201 |
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202 | /** BSP interior node implementation
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203 | */
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204 | class VspInterior: public VspNode
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205 | {
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206 | public:
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207 | /** Standard contructor taking split plane as argument.
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208 | */
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209 | VspInterior(const AxisAlignedPlane &plane);
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210 |
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211 | ~VspInterior();
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212 | /** @return false since it is an interior node
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213 | */
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214 | bool IsLeaf() const;
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215 |
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216 | int Type() const;
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217 |
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218 | VspNode *GetBack();
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219 | VspNode *GetFront();
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220 |
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221 | /** Returns split plane.
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222 | */
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223 | AxisAlignedPlane GetPlane() const;
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224 |
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225 | /** Returns position of split plane.
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226 | */
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227 | float GetPosition() const;
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228 |
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229 | /** Returns split axis.
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230 | */
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231 | int GetAxis() const;
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232 |
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233 | /** Replace front or back child with new child.
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234 | */
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235 | void ReplaceChildLink(VspNode *oldChild, VspNode *newChild);
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236 |
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237 | /** Replace front and back child.
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238 | */
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239 | void SetupChildLinks(VspNode *front, VspNode *back);
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240 |
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241 | friend ostream &operator<<(ostream &s, const VspInterior &A)
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242 | {
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243 | return s << A.mPlane.mAxis << " " << A.mPlane.mPosition;
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244 | }
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245 |
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246 | AxisAlignedBox3 GetBoundingBox() const;
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247 | void SetBoundingBox(const AxisAlignedBox3 &box);
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248 |
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249 | /** Computes intersection of this plane with the ray segment.
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250 | */
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251 | int ComputeRayIntersection(const RayInfo &rayData, float &t) const
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252 | {
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253 | return rayData.ComputeRayIntersection(mPlane.mAxis, mPlane.mPosition, t);
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254 | }
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255 |
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256 |
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257 | protected:
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258 | /// bounding box for this interior node: should we really store this?
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259 | AxisAlignedBox3 mBoundingBox;
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260 |
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261 | /// Splitting plane corresponding to this node
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262 | AxisAlignedPlane mPlane;
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263 |
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264 | /// back node
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265 | VspNode *mBack;
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266 | /// front node
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267 | VspNode *mFront;
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268 | };
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269 |
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270 |
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271 | /** BSP leaf node implementation.
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272 | */
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273 | class VspLeaf: public VspNode
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274 | {
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275 | friend VspTree;
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276 |
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277 | public:
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278 | VspLeaf();
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279 | VspLeaf(ViewCellLeaf *viewCell);
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280 | VspLeaf(VspInterior *parent);
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281 | VspLeaf(VspInterior *parent, ViewCellLeaf *viewCell);
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282 |
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283 | ~VspLeaf();
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284 |
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285 | /** @return true since it is an interior node
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286 | */
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287 | bool IsLeaf() const;
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288 |
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289 | int Type() const;
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290 |
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291 | /** Returns pointer of view cell.
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292 | */
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293 | ViewCellLeaf *GetViewCell() const;
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294 | /** Sets pointer to view cell.
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295 | */
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296 | void SetViewCell(ViewCellLeaf *viewCell);
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297 |
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298 | SubdivisionCandidate *GetSubdivisionCandidate()
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299 | {
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300 | return mSubdivisionCandidate;
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301 | }
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302 |
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303 | void SetSubdivisionCandidate(SubdivisionCandidate *candidate)
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304 | {
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305 | mSubdivisionCandidate = candidate;
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306 | }
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307 |
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308 |
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309 | public:
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310 |
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311 | /// Rays piercing this leaf.
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312 | VssRayContainer mVssRays;
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313 | /// leaf pvs
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314 | ObjectPvs *mPvs;
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315 | /// Probability that the view point lies in this leaf
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316 | float mProbability;
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317 |
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318 | protected:
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319 |
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320 | /// pointer to a split plane candidate splitting this leaf
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321 | SubdivisionCandidate *mSubdivisionCandidate;
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322 | /// if NULL this does not correspond to feasible viewcell
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323 | ViewCellLeaf *mViewCell;
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324 | };
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325 |
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326 |
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327 | /** View Space Partitioning tree.
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328 | */
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329 | class VspTree
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330 | {
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331 | friend class ViewCellsParseHandlers;
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332 | friend class HierarchyManager;
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333 |
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334 | public:
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335 |
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336 | /** Additional data which is passed down the BSP tree during traversal.
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337 | */
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338 | class VspTraversalData
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339 | {
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340 | public:
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341 |
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342 | /** Returns average ray contribution.
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343 | */
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344 | float GetAvgRayContribution() const
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345 | {
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346 | return (float)mPvs / ((float)mRays->size() + Limits::Small);
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347 | }
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348 |
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349 |
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350 | VspTraversalData():
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351 | mNode(NULL),
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352 | mDepth(0),
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353 | mRays(NULL),
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354 | mPvs(0),
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355 | mProbability(0.0),
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356 | mMaxCostMisses(0),
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357 | mPriority(0)
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358 | {}
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359 |
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360 | VspTraversalData(VspLeaf *node,
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361 | const int depth,
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362 | RayInfoContainer *rays,
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363 | const int pvs,
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364 | const float p,
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365 | const AxisAlignedBox3 &box):
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366 | mNode(node),
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367 | mDepth(depth),
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368 | mRays(rays),
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369 | mPvs(pvs),
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370 | mProbability(p),
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371 | mBoundingBox(box),
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372 | mMaxCostMisses(0),
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373 | mPriority(0)
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374 | {}
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375 |
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376 | VspTraversalData(const int depth,
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377 | RayInfoContainer *rays,
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378 | const AxisAlignedBox3 &box):
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379 | mNode(NULL),
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380 | mDepth(depth),
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381 | mRays(rays),
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382 | mPvs(0),
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383 | mProbability(0),
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384 | mMaxCostMisses(0),
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385 | mBoundingBox(box)
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386 | {}
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387 |
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388 | /** Returns cost of the traversal data.
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389 | */
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390 | float GetCost() const
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391 | {
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392 | return mPriority;
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393 | }
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394 |
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395 | /// deletes contents and sets them to NULL
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396 | void Clear()
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397 | {
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398 | DEL_PTR(mRays);
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399 |
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400 | if (mNode)
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401 | {
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402 | // delete old view cell
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403 | delete mNode->GetViewCell();
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404 | delete mNode;
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405 | mNode = NULL;
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406 | }
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407 | }
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408 |
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409 | /// the current node
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410 | VspLeaf *mNode;
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411 | /// current depth
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412 | int mDepth;
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413 | /// rays piercing this node
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414 | RayInfoContainer *mRays;
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415 | /// the probability that this node contains view point
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416 | float mProbability;
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417 | /// the bounding box of the node
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418 | AxisAlignedBox3 mBoundingBox;
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419 | /// pvs size
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420 | int mPvs;
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421 | /// how often this branch has missed the max-cost ratio
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422 | int mMaxCostMisses;
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423 | // current priority
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424 | float mPriority;
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425 |
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426 |
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427 | friend bool operator<(const VspTraversalData &a, const VspTraversalData &b)
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428 | {
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429 | return a.GetCost() < b.GetCost();
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430 | }
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431 | };
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432 |
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433 | /** Candidate for a view space split.
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434 | */
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435 | class VspSubdivisionCandidate: public SubdivisionCandidate
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436 | {
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437 | public:
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438 |
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439 | static VspTree* sVspTree;
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440 |
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441 | /// the current split plane
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442 | AxisAlignedPlane mSplitPlane;
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443 | /// parent node traversal data
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444 | VspTraversalData mParentData;
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445 |
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446 | VspSubdivisionCandidate(const VspTraversalData &tData): mParentData(tData)
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447 | {};
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448 |
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449 | ~VspSubdivisionCandidate()
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450 | {
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451 | mParentData.Clear();
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452 | }
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453 |
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454 | int Type() const { return VIEW_SPACE; }
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455 |
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456 | void EvalPriority()
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457 | {
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458 | sVspTree->EvalSubdivisionCandidate(*this);
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459 | }
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460 |
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461 | bool GlobalTerminationCriteriaMet() const
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462 | {
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463 | return sVspTree->GlobalTerminationCriteriaMet(mParentData);
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464 | }
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465 |
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466 | VspSubdivisionCandidate(
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467 | const AxisAlignedPlane &plane,
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468 | const VspTraversalData &tData):
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469 | mSplitPlane(plane), mParentData(tData)
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470 | {}
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471 | };
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472 |
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473 | /** Struct for traversing line segment.
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474 | */
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475 | struct LineTraversalData
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476 | {
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477 | VspNode *mNode;
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478 | Vector3 mExitPoint;
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479 | float mMaxT;
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480 |
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481 | LineTraversalData () {}
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482 | LineTraversalData (VspNode *n, const Vector3 &p, const float maxt):
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483 | mNode(n), mExitPoint(p), mMaxT(maxt) {}
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484 | };
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485 |
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486 | /** Default constructor creating an empty tree.
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487 | */
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488 | VspTree();
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489 | /** Default destructor.
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490 | */
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491 | ~VspTree();
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492 |
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493 | /** Returns BSP Tree statistics.
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494 | */
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495 | const VspTreeStatistics &GetStatistics() const;
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496 |
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497 | /** Returns bounding box of the specified node.
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498 | */
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499 | AxisAlignedBox3 GetBoundingBox(VspNode *node) const;
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500 |
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501 | /** Returns list of BSP leaves with pvs smaller than
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502 | a certain threshold.
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503 | @param onlyUnmailed if only the unmailed leaves should be considered
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504 | @param maxPvs the maximal pvs of a leaf to be added (-1 means unlimited)
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505 | */
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506 | void CollectLeaves(vector<VspLeaf *> &leaves,
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507 | const bool onlyUnmailed = false,
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508 | const int maxPvs = -1) const;
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509 |
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510 | /** Returns box which bounds the whole tree.
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511 | */
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512 | AxisAlignedBox3 GetBoundingBox() const;
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513 |
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514 | /** Returns root of the view space partitioning tree.
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515 | */
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516 | VspNode *GetRoot() const;
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517 |
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518 | /** Collects the leaf view cells of the tree
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519 | @param viewCells returns the view cells
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520 | */
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521 | void CollectViewCells(ViewCellContainer &viewCells, bool onlyValid) const;
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522 |
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523 | /** A ray is cast possible intersecting the tree.
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524 | @param the ray that is cast.
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525 | @returns the number of intersections with objects stored in the tree.
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526 | */
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527 | int CastRay(Ray &ray);
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528 |
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529 |
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530 | /** finds neighbouring leaves of this tree node.
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531 | */
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532 | int FindNeighbors(VspLeaf *n,
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533 | vector<VspLeaf *> &neighbors,
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534 | const bool onlyUnmailed) const;
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535 |
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536 | /** Returns random leaf of BSP tree.
|
---|
537 | @param halfspace defines the halfspace from which the leaf is taken.
|
---|
538 | */
|
---|
539 | VspLeaf *GetRandomLeaf(const Plane3 &halfspace);
|
---|
540 |
|
---|
541 | /** Returns random leaf of BSP tree.
|
---|
542 | @param onlyUnmailed if only unmailed leaves should be returned.
|
---|
543 | */
|
---|
544 | VspLeaf *GetRandomLeaf(const bool onlyUnmailed = false);
|
---|
545 |
|
---|
546 | /** Returns epsilon of this tree.
|
---|
547 | */
|
---|
548 | float GetEpsilon() const;
|
---|
549 |
|
---|
550 | /** Casts line segment into the tree.
|
---|
551 | @param origin the origin of the line segment
|
---|
552 | @param termination the end point of the line segment
|
---|
553 | @returns view cells intersecting the line segment.
|
---|
554 | */
|
---|
555 | int CastLineSegment(const Vector3 &origin,
|
---|
556 | const Vector3 &termination,
|
---|
557 | ViewCellContainer &viewcells,
|
---|
558 | const bool useMailboxing = true);
|
---|
559 |
|
---|
560 |
|
---|
561 | /** Sets pointer to view cells manager.
|
---|
562 | */
|
---|
563 | void SetViewCellsManager(ViewCellsManager *vcm);
|
---|
564 |
|
---|
565 | /** Returns view cell the current point is located in.
|
---|
566 | @param point the current view point
|
---|
567 | @param active if currently active view cells should be returned or
|
---|
568 | elementary view cell
|
---|
569 | */
|
---|
570 | ViewCell *GetViewCell(const Vector3 &point, const bool active = false);
|
---|
571 |
|
---|
572 |
|
---|
573 | /** Returns true if this view point is in a valid view space,
|
---|
574 | false otherwise.
|
---|
575 | */
|
---|
576 | bool ViewPointValid(const Vector3 &viewPoint) const;
|
---|
577 |
|
---|
578 | /** Returns view cell corresponding to
|
---|
579 | the invalid view space.
|
---|
580 | */
|
---|
581 | VspViewCell *GetOutOfBoundsCell();
|
---|
582 |
|
---|
583 | /** Writes tree to output stream
|
---|
584 | */
|
---|
585 | bool Export(OUT_STREAM &stream);
|
---|
586 |
|
---|
587 | /** Casts beam, i.e. a 5D frustum of rays, into tree.
|
---|
588 | Tests conservative using the bounding box of the nodes.
|
---|
589 | @returns number of view cells it intersected
|
---|
590 | */
|
---|
591 | int CastBeam(Beam &beam);
|
---|
592 |
|
---|
593 | /** Checks if tree validity-flags are right
|
---|
594 | with respect to view cell valitiy.
|
---|
595 | If not, marks subtree as invalid.
|
---|
596 | */
|
---|
597 | void ValidateTree();
|
---|
598 |
|
---|
599 | /** Invalid view cells are added to the unbounded space
|
---|
600 | */
|
---|
601 | void CollapseViewCells();
|
---|
602 |
|
---|
603 | /** Collects rays stored in the leaves.
|
---|
604 | */
|
---|
605 | void CollectRays(VssRayContainer &rays);
|
---|
606 |
|
---|
607 | /** Intersects box with the tree and returns the number of intersected boxes.
|
---|
608 | @returns number of view cells found
|
---|
609 | */
|
---|
610 | int ComputeBoxIntersections(const AxisAlignedBox3 &box,
|
---|
611 | ViewCellContainer &viewCells) const;
|
---|
612 |
|
---|
613 | /** Remove the references of the parent view cell from the kd nodes associated with
|
---|
614 | the objects.
|
---|
615 | */
|
---|
616 | void RemoveParentViewCellReferences(ViewCell *parent) const;
|
---|
617 |
|
---|
618 | /** Adds references to the view cell to the kd nodes associated with the objects.
|
---|
619 | */
|
---|
620 | void AddViewCellReferences(ViewCell *vc) const;
|
---|
621 |
|
---|
622 | /** Returns view cells of this ray, either taking precomputed cells
|
---|
623 | or by recomputation.
|
---|
624 | */
|
---|
625 | void GetViewCells(const VssRay &ray, ViewCellContainer &viewCells);
|
---|
626 |
|
---|
627 | /** Returns view cells tree.
|
---|
628 | */
|
---|
629 | ViewCellsTree *GetViewCellsTree() const { return mViewCellsTree; }
|
---|
630 |
|
---|
631 | /** Sets the view cells tree.
|
---|
632 | */
|
---|
633 | void SetViewCellsTree(ViewCellsTree *vt) { mViewCellsTree = vt; }
|
---|
634 |
|
---|
635 |
|
---|
636 | protected:
|
---|
637 |
|
---|
638 | // --------------------------------------------------------------
|
---|
639 | // For sorting objects
|
---|
640 | // --------------------------------------------------------------
|
---|
641 | struct SortableEntry
|
---|
642 | {
|
---|
643 | enum EType
|
---|
644 | {
|
---|
645 | ERayMin,
|
---|
646 | ERayMax
|
---|
647 | };
|
---|
648 |
|
---|
649 | int type;
|
---|
650 | float value;
|
---|
651 | VssRay *ray;
|
---|
652 |
|
---|
653 | SortableEntry() {}
|
---|
654 | SortableEntry(const int t, const float v, VssRay *r):
|
---|
655 | type(t), value(v), ray(r)
|
---|
656 | {
|
---|
657 | }
|
---|
658 |
|
---|
659 | friend inline bool operator<(const SortableEntry &a, const SortableEntry &b)
|
---|
660 | { // prefer max event
|
---|
661 | //if (EpsilonEqual(a.value, b.value, 0.0001f))
|
---|
662 | // return (a.type == ERayMax);
|
---|
663 |
|
---|
664 | return (a.value < b.value);
|
---|
665 | }
|
---|
666 | };
|
---|
667 |
|
---|
668 | /** faster evaluation of split plane cost for kd axis aligned cells.
|
---|
669 | */
|
---|
670 | float EvalLocalSplitCost(const VspTraversalData &data,
|
---|
671 | const AxisAlignedBox3 &box,
|
---|
672 | const int axis,
|
---|
673 | const float &position,
|
---|
674 | float &pFront,
|
---|
675 | float &pBack) const;
|
---|
676 |
|
---|
677 | void ComputeBoundingBox(const VssRayContainer &rays,
|
---|
678 | AxisAlignedBox3 *forcedBoundingBox);
|
---|
679 |
|
---|
680 | /** Evaluates candidate for splitting.
|
---|
681 | */
|
---|
682 | void EvalSubdivisionCandidate(VspSubdivisionCandidate &splitData);
|
---|
683 |
|
---|
684 | /** Evaluates render cost decrease of next split.
|
---|
685 | */
|
---|
686 | float EvalRenderCostDecrease(const AxisAlignedPlane &candidatePlane,
|
---|
687 | const VspTraversalData &data,
|
---|
688 | float &normalizedOldRenderCost) const;
|
---|
689 |
|
---|
690 | /** Collects view cells in the subtree under root.
|
---|
691 | */
|
---|
692 | void CollectViewCells(VspNode *root,
|
---|
693 | bool onlyValid,
|
---|
694 | ViewCellContainer &viewCells,
|
---|
695 | bool onlyUnmailed = false) const;
|
---|
696 |
|
---|
697 | /** Returns view cell corresponding to
|
---|
698 | the invalid view space. If it does not exist, it is created.
|
---|
699 | */
|
---|
700 | VspViewCell *GetOrCreateOutOfBoundsCell();
|
---|
701 |
|
---|
702 | /** Collapses the tree with respect to the view cell partition,
|
---|
703 | i.e. leaves having the same view cell are collapsed.
|
---|
704 | @param node the root of the subtree to be collapsed
|
---|
705 | @param collapsed returns the number of collapsed nodes
|
---|
706 | @returns node of type leaf if the node could be collapsed,
|
---|
707 | this node otherwise
|
---|
708 | */
|
---|
709 | VspNode *CollapseTree(VspNode *node, int &collapsed);
|
---|
710 |
|
---|
711 | /** Helper function revalidating the view cell leaf list after merge.
|
---|
712 | */
|
---|
713 | void RepairViewCellsLeafLists();
|
---|
714 |
|
---|
715 | /** Evaluates tree stats in the BSP tree leafs.
|
---|
716 | */
|
---|
717 | void EvaluateLeafStats(const VspTraversalData &data);
|
---|
718 |
|
---|
719 | /** Subdivides node using a best split priority queue.
|
---|
720 | @param tQueue the best split priority queue
|
---|
721 | @param splitCandidate the candidate for the next split
|
---|
722 | @param globalCriteriaMet if the global termination criteria were already met
|
---|
723 | @returns new root of the subtree
|
---|
724 | */
|
---|
725 | VspNode *Subdivide(SplitQueue &tQueue,
|
---|
726 | SubdivisionCandidate *splitCandidate,
|
---|
727 | const bool globalCriteriaMet);
|
---|
728 |
|
---|
729 | /** Adds stats to subdivision log file.
|
---|
730 | */
|
---|
731 | void AddSubdivisionStats(const int viewCells,
|
---|
732 | const float renderCostDecr,
|
---|
733 | const float totalRenderCost,
|
---|
734 | const float avgRenderCost);
|
---|
735 |
|
---|
736 | /** Subdivides leaf.
|
---|
737 |
|
---|
738 | @param tData data object holding, e.g., a pointer to the leaf
|
---|
739 | @param frontData returns the data (e.g., pointer to the leaf) in front of the split plane
|
---|
740 | @param backData returns the data (e.g., pointer to the leaf) in the back of the split plane
|
---|
741 |
|
---|
742 | @param rays the polygons to be filtered
|
---|
743 | @param frontRays returns the polygons in front of the split plane
|
---|
744 |
|
---|
745 | @returns the root of the subdivision
|
---|
746 | */
|
---|
747 | VspInterior *SubdivideNode(const AxisAlignedPlane &splitPlane,
|
---|
748 | VspTraversalData &tData,
|
---|
749 | VspTraversalData &frontData,
|
---|
750 | VspTraversalData &backData);
|
---|
751 |
|
---|
752 | /** Selects an axis aligned for the next split.
|
---|
753 | @returns cost for this split
|
---|
754 | */
|
---|
755 | float SelectSplitPlane(const VspTraversalData &tData,
|
---|
756 | AxisAlignedPlane &plane,
|
---|
757 | float &pFront,
|
---|
758 | float &pBack);
|
---|
759 |
|
---|
760 | /** Sorts split candidates along the specified axis.
|
---|
761 | The split candidates are generated on possible visibility
|
---|
762 | events (i.e., where ray segments intersect the ray boundaries).
|
---|
763 | The sorted candidates are needed to compute the heuristics.
|
---|
764 |
|
---|
765 | @param polys the input for choosing split candidates
|
---|
766 | @param axis the current split axis
|
---|
767 | @param splitCandidates returns sorted list of split candidates
|
---|
768 | */
|
---|
769 | void SortSubdivisionCandidates(const RayInfoContainer &rays,
|
---|
770 | const int axis,
|
---|
771 | float minBand,
|
---|
772 | float maxBand);
|
---|
773 |
|
---|
774 | /** Evaluate pvs size as induced by the samples.
|
---|
775 | */
|
---|
776 | int EvalPvsSize(const RayInfoContainer &rays) const;
|
---|
777 |
|
---|
778 | /** Computes best cost for axis aligned planes.
|
---|
779 | */
|
---|
780 | float EvalLocalCostHeuristics(const VspTraversalData &tData,
|
---|
781 | const AxisAlignedBox3 &box,
|
---|
782 | const int axis,
|
---|
783 | float &position);
|
---|
784 |
|
---|
785 |
|
---|
786 | //////////////////////////////////////////
|
---|
787 | // Helper function for computing heuristics
|
---|
788 |
|
---|
789 | /** Evaluates the contribution to left and right pvs at a visibility event ve.
|
---|
790 | @param ve the visibility event
|
---|
791 | @param pvsLeft updates the left pvs
|
---|
792 | @param rightPvs updates the right pvs
|
---|
793 | */
|
---|
794 | void EvalHeuristics(const SortableEntry &ve, int &pvsLeft, int &pvsRight) const;
|
---|
795 |
|
---|
796 | /** Evaluates contribution of min event to pvs
|
---|
797 | */
|
---|
798 | int EvalMinEventContribution(
|
---|
799 | const VssRay &ray, const bool isTermination) const;
|
---|
800 |
|
---|
801 | /** Evaluates contribution of max event to pvs
|
---|
802 | */
|
---|
803 | int EvalMaxEventContribution(
|
---|
804 | const VssRay &ray, const bool isTermination) const;
|
---|
805 |
|
---|
806 | /** Evaluates contribution of kd leaf when encountering a min event
|
---|
807 | */
|
---|
808 | int EvalMinEventContribution(KdLeaf *leaf) const;
|
---|
809 | /** Evaluates contribution of kd leaf when encountering a max event
|
---|
810 | */
|
---|
811 | int EvalMaxEventContribution(KdLeaf *leaf) const;
|
---|
812 |
|
---|
813 | /** Prepares objects for the heuristics.
|
---|
814 | @returns pvs size as seen by the rays.
|
---|
815 | */
|
---|
816 | int PrepareHeuristics(const RayInfoContainer &rays);
|
---|
817 |
|
---|
818 | /** Prepare a single ray for heuristics.
|
---|
819 | */
|
---|
820 | int PrepareHeuristics(const VssRay &ray, const bool isTermination);
|
---|
821 | /** Prepare a single kd leaf for heuristics.
|
---|
822 | */
|
---|
823 | int PrepareHeuristics(KdLeaf *leaf);
|
---|
824 |
|
---|
825 | /////////////////////////////////////////////////////////////////////////////
|
---|
826 |
|
---|
827 |
|
---|
828 | /** Subdivides the rays into front and back rays according to the split plane.
|
---|
829 |
|
---|
830 | @param plane the split plane
|
---|
831 | @param rays contains the rays to be split. The rays are
|
---|
832 | distributed into front and back rays.
|
---|
833 | @param frontRays returns rays on the front side of the plane
|
---|
834 | @param backRays returns rays on the back side of the plane
|
---|
835 |
|
---|
836 | @returns the number of splits
|
---|
837 | */
|
---|
838 | int SplitRays(const AxisAlignedPlane &plane,
|
---|
839 | RayInfoContainer &rays,
|
---|
840 | RayInfoContainer &frontRays,
|
---|
841 | RayInfoContainer &backRays) const;
|
---|
842 |
|
---|
843 | /** Classfifies the object with respect to the
|
---|
844 | pvs of the front and back leaf and updates pvs size
|
---|
845 | accordingly.
|
---|
846 |
|
---|
847 | @param obj the object to be added
|
---|
848 | @param cf the ray classification regarding the split plane
|
---|
849 | @param frontPvs returns the PVS of the front partition
|
---|
850 | @param backPvs returns the PVS of the back partition
|
---|
851 |
|
---|
852 | */
|
---|
853 | void UpdateContributionsToPvs(
|
---|
854 | const VssRay &ray,
|
---|
855 | const bool isTermination,
|
---|
856 | const int cf,
|
---|
857 | float &frontPvs,
|
---|
858 | float &backPvs,
|
---|
859 | float &totalPvs) const;
|
---|
860 |
|
---|
861 | /** Evaluates the contribution for objects.
|
---|
862 | */
|
---|
863 | void UpdateContributionsToPvs(
|
---|
864 | Intersectable *obj,
|
---|
865 | const int cf,
|
---|
866 | float &frontPvs,
|
---|
867 | float &backPvs,
|
---|
868 | float &totalPvs) const;
|
---|
869 |
|
---|
870 | /** Evaluates the contribution for bounding volume leaves.
|
---|
871 | */
|
---|
872 | void UpdateContributionsToPvs(
|
---|
873 | BvhLeaf *leaf,
|
---|
874 | const int cf,
|
---|
875 | float &frontPvs,
|
---|
876 | float &backPvs,
|
---|
877 | float &totalPvs) const;
|
---|
878 |
|
---|
879 | /** Evaluates the contribution for kd leaves.
|
---|
880 | */
|
---|
881 | void UpdateContributionsToPvs(
|
---|
882 | KdLeaf *leaf,
|
---|
883 | const int cf,
|
---|
884 | float &frontPvs,
|
---|
885 | float &backPvs,
|
---|
886 | float &totalPvs) const;
|
---|
887 |
|
---|
888 | /** Returns true if tree can be terminated.
|
---|
889 | */
|
---|
890 | bool LocalTerminationCriteriaMet(const VspTraversalData &data) const;
|
---|
891 |
|
---|
892 | /** Returns true if global tree can be terminated.
|
---|
893 | */
|
---|
894 | bool GlobalTerminationCriteriaMet(const VspTraversalData &data) const;
|
---|
895 |
|
---|
896 | /** Adds ray sample contributions to the PVS.
|
---|
897 | @param sampleContributions the number contributions of the samples
|
---|
898 | @param contributingSampels the number of contributing rays
|
---|
899 |
|
---|
900 | */
|
---|
901 | void AddSamplesToPvs(VspLeaf *leaf,
|
---|
902 | const RayInfoContainer &rays,
|
---|
903 | float &sampleContributions,
|
---|
904 | int &contributingSamples);
|
---|
905 |
|
---|
906 | /** Propagates valid flag up the tree.
|
---|
907 | */
|
---|
908 | void PropagateUpValidity(VspNode *node);
|
---|
909 |
|
---|
910 | /** Writes the node to disk
|
---|
911 | @note: should be implemented as visitor.
|
---|
912 | */
|
---|
913 | void ExportNode(VspNode *node, OUT_STREAM &stream);
|
---|
914 |
|
---|
915 | /** Returns estimated memory usage of tree.
|
---|
916 | */
|
---|
917 | float GetMemUsage() const;
|
---|
918 |
|
---|
919 | /** Updates view cell pvs of objects.
|
---|
920 | */
|
---|
921 | void ProcessViewCellObjects(ViewCell *parent,
|
---|
922 | ViewCell *front,
|
---|
923 | ViewCell *back) const;
|
---|
924 |
|
---|
925 | void CreateViewCell(VspTraversalData &tData, const bool updatePvs);
|
---|
926 |
|
---|
927 | /** Collect split candidates which are affected by the last split
|
---|
928 | and must be reevaluated.
|
---|
929 | */
|
---|
930 | void CollectDirtyCandidates(VspSubdivisionCandidate *sc, vector<SubdivisionCandidate *> &dirtyList);
|
---|
931 |
|
---|
932 | void CollectDirtyCandidate(
|
---|
933 | const VssRay &ray,
|
---|
934 | const bool isTermination,
|
---|
935 | vector<SubdivisionCandidate *> &dirtyList) const;
|
---|
936 |
|
---|
937 | /** Rays will be clipped to the bounding box.
|
---|
938 | */
|
---|
939 | void PreprocessRays(const VssRayContainer &sampleRays, RayInfoContainer &rays);
|
---|
940 |
|
---|
941 | /** Evaluate subdivision statistics.
|
---|
942 | */
|
---|
943 | void EvalSubdivisionStats(const SubdivisionCandidate &tData);
|
---|
944 |
|
---|
945 | SubdivisionCandidate *PrepareConstruction(
|
---|
946 | const VssRayContainer &sampleRays,
|
---|
947 | AxisAlignedBox3 *forcedViewSpace,
|
---|
948 | RayInfoContainer &rays);
|
---|
949 |
|
---|
950 | /** Evaluates pvs contribution of this ray.
|
---|
951 | */
|
---|
952 | int EvalContributionToPvs(const VssRay &ray, const bool isTermination) const;
|
---|
953 |
|
---|
954 | /** Evaluates pvs contribution of a kd node.
|
---|
955 | */
|
---|
956 | int EvalContributionToPvs(KdLeaf *leaf) const;
|
---|
957 |
|
---|
958 |
|
---|
959 | protected:
|
---|
960 |
|
---|
961 | /// pointer to the hierarchy of view cells
|
---|
962 | ViewCellsTree *mViewCellsTree;
|
---|
963 |
|
---|
964 | HierarchyManager *mHierarchyManager;
|
---|
965 | //OspTree *mOspTree;
|
---|
966 | //bool mUseKdPvsForHeuristics;
|
---|
967 |
|
---|
968 | ViewCellsManager *mViewCellsManager;
|
---|
969 |
|
---|
970 | vector<SortableEntry> *mLocalSubdivisionCandidates;
|
---|
971 |
|
---|
972 | /// Pointer to the root of the tree
|
---|
973 | VspNode *mRoot;
|
---|
974 |
|
---|
975 | VspTreeStatistics mVspStats;
|
---|
976 |
|
---|
977 | /// View cell corresponding to the space outside the valid view space
|
---|
978 | VspViewCell *mOutOfBoundsCell;
|
---|
979 |
|
---|
980 | /// box around the whole view domain
|
---|
981 | AxisAlignedBox3 mBoundingBox;
|
---|
982 |
|
---|
983 |
|
---|
984 | //-- local termination
|
---|
985 |
|
---|
986 | /// minimal number of rays before subdivision termination
|
---|
987 | int mTermMinRays;
|
---|
988 | /// maximal possible depth
|
---|
989 | int mTermMaxDepth;
|
---|
990 | /// mininum probability
|
---|
991 | float mTermMinProbability;
|
---|
992 | /// mininum PVS
|
---|
993 | int mTermMinPvs;
|
---|
994 | /// maximal contribution per ray
|
---|
995 | float mTermMaxRayContribution;
|
---|
996 | /// maximal acceptable cost ratio
|
---|
997 | float mTermMaxCostRatio;
|
---|
998 | /// tolerance value indicating how often the max cost ratio can be failed
|
---|
999 | int mTermMissTolerance;
|
---|
1000 |
|
---|
1001 |
|
---|
1002 | //-- global criteria
|
---|
1003 | float mTermMinGlobalCostRatio;
|
---|
1004 | int mTermGlobalCostMissTolerance;
|
---|
1005 | int mGlobalCostMisses;
|
---|
1006 |
|
---|
1007 | /// maximal number of view cells
|
---|
1008 | int mMaxViewCells;
|
---|
1009 | /// maximal tree memory
|
---|
1010 | float mMaxMemory;
|
---|
1011 | /// the tree is out of memory
|
---|
1012 | bool mOutOfMemory;
|
---|
1013 |
|
---|
1014 |
|
---|
1015 | //-- split heuristics based parameters
|
---|
1016 |
|
---|
1017 | bool mUseCostHeuristics;
|
---|
1018 | /// balancing factor for PVS criterium
|
---|
1019 | float mCtDivCi;
|
---|
1020 | /// if only driving axis should be used for split
|
---|
1021 | bool mOnlyDrivingAxis;
|
---|
1022 | /// if random split axis should be used
|
---|
1023 | bool mUseRandomAxis;
|
---|
1024 | /// if vsp bsp tree should simulate octree
|
---|
1025 | bool mCirculatingAxis;
|
---|
1026 | /// minimal relative position where the split axis can be placed
|
---|
1027 | float mMinBand;
|
---|
1028 | /// maximal relative position where the split axis can be placed
|
---|
1029 | float mMaxBand;
|
---|
1030 |
|
---|
1031 |
|
---|
1032 | /// current time stamp (used for keeping split history)
|
---|
1033 | int mTimeStamp;
|
---|
1034 | // if rays should be stored in leaves
|
---|
1035 | bool mStoreRays;
|
---|
1036 |
|
---|
1037 | /// epsilon for geometric comparisons
|
---|
1038 | float mEpsilon;
|
---|
1039 |
|
---|
1040 |
|
---|
1041 | /// subdivision stats output file
|
---|
1042 | ofstream mSubdivisionStats;
|
---|
1043 | /// keeps track of cost during subdivision
|
---|
1044 | float mTotalCost;
|
---|
1045 | /// keeps track of overall pvs size during subdivision
|
---|
1046 | int mTotalPvsSize;
|
---|
1047 | /// number of currenly generated view cells
|
---|
1048 | int mCreatedViewCells;
|
---|
1049 |
|
---|
1050 | /// weight between render cost decrease and node render cost
|
---|
1051 | float mRenderCostDecreaseWeight;
|
---|
1052 |
|
---|
1053 | int mMaxTests;
|
---|
1054 | };
|
---|
1055 |
|
---|
1056 |
|
---|
1057 | }
|
---|
1058 |
|
---|
1059 | #endif
|
---|