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2 | // ================================================================
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3 | // $Id: lsds_kdtree.cpp,v 1.18 2005/04/16 09:34:21 bittner Exp $
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4 | // ****************************************************************
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5 | /**
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6 | The KD tree based LSDS
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7 | */
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8 | // Initial coding by
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9 | /**
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10 | @author Jiri Bittner
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11 | */
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12 |
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13 | // Standard headers
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14 | #include <stack>
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15 | #include <queue>
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16 | #include <algorithm>
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17 | #include <fstream>
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18 | #include <string>
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19 |
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20 | #include "VspKdTree.h"
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21 |
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22 | #include "Environment.h"
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23 | #include "VssRay.h"
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24 | #include "Intersectable.h"
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25 | #include "Ray.h"
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26 | #include "RayInfo.h"
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27 | #include "ViewCell.h"
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28 | #include "ViewCellsManager.h"
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29 | #include "ViewCellBsp.h"
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30 |
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31 | // Static variables
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32 | int VspKdLeaf::sMailId = 0;
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33 | int MergeCandidate::sMaxPvsSize = 150;
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34 |
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35 |
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36 | #define USE_FIXEDPOINT_T 0
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37 |
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38 | /// Adds object to the pvs of the front and back node
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39 | inline void AddObject2Pvs(Intersectable *object,
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40 | const int side,
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41 | int &pvsBack,
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42 | int &pvsFront)
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43 | {
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44 | if (!object)
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45 | return;
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46 |
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47 | if (side <= 0)
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48 | {
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49 | if (!object->Mailed() && !object->Mailed(2))
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50 | {
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51 | ++ pvsBack;
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52 |
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53 | if (object->Mailed(1))
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54 | object->Mail(2);
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55 | else
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56 | object->Mail();
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57 | }
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58 | }
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59 |
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60 | if (side >= 0)
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61 | {
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62 | if (!object->Mailed(1) && !object->Mailed(2))
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63 | {
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64 | ++ pvsFront;
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65 |
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66 | if (object->Mailed())
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67 | object->Mail(2);
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68 | else
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69 | object->Mail(1);
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70 | }
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71 | }
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72 | }
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73 |
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74 | /**************************************************************/
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75 | /* class VspKdNode implementation */
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76 | /**************************************************************/
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77 |
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78 | // Inline constructor
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79 | VspKdNode::VspKdNode(VspKdInterior *p):
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80 | mParent(p), mAxis(-1), mDepth(p ? p->mDepth + 1 : 0)
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81 | {}
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82 |
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83 | VspKdNode::~VspKdNode()
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84 | {};
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85 |
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86 | inline VspKdInterior *VspKdNode::GetParent() const
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87 | {
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88 | return mParent;
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89 | }
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90 |
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91 | inline void VspKdNode::SetParent(VspKdInterior *p)
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92 | {
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93 | mParent = p;
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94 | }
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95 |
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96 | bool VspKdNode::IsLeaf() const
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97 | {
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98 | return mAxis == -1;
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99 | }
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100 |
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101 | int VspKdNode::GetAccessTime()
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102 | {
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103 | return 0x7FFFFFF;
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104 | }
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105 |
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106 | /**************************************************************/
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107 | /* VspKdInterior implementation */
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108 | /**************************************************************/
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109 |
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110 | VspKdInterior::VspKdInterior(VspKdInterior *p):
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111 | VspKdNode(p), mBack(NULL), mFront(NULL), mAccesses(0), mLastAccessTime(-1)
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112 | {
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113 | }
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114 |
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115 | int VspKdInterior::GetAccessTime()
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116 | {
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117 | return mLastAccessTime;
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118 | }
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119 |
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120 | void VspKdInterior::SetupChildLinks(VspKdNode *b, VspKdNode *f)
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121 | {
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122 | mBack = b;
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123 | mFront = f;
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124 | b->SetParent(this);
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125 | f->SetParent(this);
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126 | }
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127 |
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128 | void VspKdInterior::ReplaceChildLink(VspKdNode *oldChild,
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129 | VspKdNode *newChild)
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130 | {
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131 | if (mBack == oldChild)
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132 | mBack = newChild;
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133 | else
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134 | mFront = newChild;
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135 | }
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136 |
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137 | int VspKdInterior::Type() const
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138 | {
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139 | return EInterior;
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140 | }
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141 |
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142 | VspKdInterior::~VspKdInterior()
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143 | {
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144 | DEL_PTR(mBack);
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145 | DEL_PTR(mFront);
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146 | }
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147 |
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148 | void VspKdInterior::Print(ostream &s) const
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149 | {
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150 | switch (mAxis)
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151 | {
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152 | case 0:
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153 | s << "x "; break;
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154 | case 1:
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155 | s << "y "; break;
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156 | case 2:
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157 | s << "z "; break;
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158 | }
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159 |
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160 | s << mPosition << " ";
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161 |
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162 | mBack->Print(s);
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163 | mFront->Print(s);
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164 | }
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165 |
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166 | int VspKdInterior::ComputeRayIntersection(const RayInfo &rayData, float &t)
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167 | {
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168 | return rayData.ComputeRayIntersection(mAxis, mPosition, t);
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169 | }
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170 |
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171 | VspKdNode *VspKdInterior::GetBack() const
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172 | {
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173 | return mBack;
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174 | }
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175 |
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176 | VspKdNode *VspKdInterior::GetFront() const
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177 | {
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178 | return mFront;
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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 | /* class VspKdLeaf implementation */
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184 | /**************************************************************/
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185 |
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186 |
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187 | VspKdLeaf::VspKdLeaf(VspKdInterior *p, const int nRays):
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188 | VspKdNode(p), mRays(), mPvsSize(0), mValidPvs(false), mViewCell(NULL)
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189 | {
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190 | mRays.reserve(nRays);
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191 | }
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192 |
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193 | VspKdLeaf::~VspKdLeaf()
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194 | {
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195 | }
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196 |
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197 | int VspKdLeaf::Type() const
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198 | {
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199 | return ELeaf;
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200 | }
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201 |
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202 | void VspKdLeaf::Print(ostream &s) const
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203 | {
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204 | s << endl << "L: r = " << (int)mRays.size() << endl;
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205 | };
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206 |
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207 | void VspKdLeaf::AddRay(const RayInfo &data)
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208 | {
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209 | mValidPvs = false;
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210 | mRays.push_back(data);
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211 | data.mRay->Ref();
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212 | }
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213 |
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214 | int VspKdLeaf::GetPvsSize() const
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215 | {
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216 | return mPvsSize;
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217 | }
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218 |
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219 | void VspKdLeaf::SetPvsSize(const int s)
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220 | {
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221 | mPvsSize = s;
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222 | }
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223 |
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224 | void VspKdLeaf::Mail()
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225 | {
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226 | mMailbox = sMailId;
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227 | }
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228 |
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229 | void VspKdLeaf::NewMail()
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230 | {
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231 | ++ sMailId;
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232 | }
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233 |
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234 | bool VspKdLeaf::Mailed() const
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235 | {
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236 | return mMailbox == sMailId;
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237 | }
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238 |
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239 | bool VspKdLeaf::Mailed(const int mail) const
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240 | {
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241 | return mMailbox == mail;
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242 | }
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243 |
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244 | int VspKdLeaf::GetMailbox() const
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245 | {
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246 | return mMailbox;
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247 | }
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248 |
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249 | float VspKdLeaf::GetAvgRayContribution() const
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250 | {
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251 | return GetPvsSize() / ((float)mRays.size() + Limits::Small);
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252 | }
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253 |
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254 | float VspKdLeaf::GetSqrRayContribution() const
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255 | {
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256 | return sqr(GetAvgRayContribution());
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257 | }
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258 |
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259 | RayInfoContainer &VspKdLeaf::GetRays()
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260 | {
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261 | return mRays;
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262 | }
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263 |
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264 | void VspKdLeaf::ExtractPvs(ObjectContainer &objects) const
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265 | {
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266 | RayInfoContainer::const_iterator it, it_end = mRays.end();
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267 |
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268 | for (it = mRays.begin(); it != it_end; ++ it)
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269 | {
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270 | if ((*it).mRay->mTerminationObject)
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271 | objects.push_back((*it).mRay->mTerminationObject);
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272 | if ((*it).mRay->mOriginObject)
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273 | objects.push_back((*it).mRay->mOriginObject);
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274 | }
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275 | }
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276 |
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277 | void VspKdLeaf::GetRays(VssRayContainer &rays)
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278 | {
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279 | RayInfoContainer::const_iterator it, it_end = mRays.end();
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280 |
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281 | for (it = mRays.begin(); it != mRays.end(); ++ it)
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282 | rays.push_back((*it).mRay);
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283 | }
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284 |
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285 | VspKdViewCell *VspKdLeaf::GetViewCell()
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286 | {
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287 | return mViewCell;
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288 | }
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289 |
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290 | void VspKdLeaf::SetViewCell(VspKdViewCell *viewCell)
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291 | {
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292 | mViewCell = viewCell;
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293 | }
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294 |
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295 |
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296 | void VspKdLeaf::UpdatePvsSize()
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297 | {
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298 | if (!mValidPvs)
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299 | {
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300 | Intersectable::NewMail();
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301 | int pvsSize = 0;
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302 | for(RayInfoContainer::iterator ri = mRays.begin();
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303 | ri != mRays.end(); ++ ri)
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304 | {
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305 | if ((*ri).mRay->IsActive())
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306 | {
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307 | Intersectable *object;
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308 | #if BIDIRECTIONAL_RAY
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309 | object = (*ri).mRay->mOriginObject;
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310 |
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311 | if (object && !object->Mailed())
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312 | {
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313 | ++ pvsSize;
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314 | object->Mail();
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315 | }
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316 | #endif
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317 | object = (*ri).mRay->mTerminationObject;
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318 | if (object && !object->Mailed())
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319 | {
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320 | ++ pvsSize;
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321 | object->Mail();
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322 | }
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323 | }
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324 | }
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325 |
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326 | mPvsSize = pvsSize;
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327 | mValidPvs = true;
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328 | }
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329 | }
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330 |
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331 | /*********************************************************/
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332 | /* class VspKdTree implementation */
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333 | /*********************************************************/
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334 |
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335 |
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336 |
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337 | VspKdTree::VspKdTree(): mOnlyDrivingAxis(true)
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338 | {
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339 | environment->GetIntValue("VspKdTree.Termination.maxDepth", mTermMaxDepth);
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340 | environment->GetIntValue("VspKdTree.Termination.minPvs", mTermMinPvs);
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341 | environment->GetIntValue("VspKdTree.Termination.minRays", mTermMinRays);
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342 | environment->GetFloatValue("VspKdTree.Termination.maxRayContribution", mTermMaxRayContribution);
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343 | environment->GetFloatValue("VspKdTree.Termination.maxCostRatio", mTermMaxCostRatio);
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344 | environment->GetFloatValue("VspKdTree.Termination.minSize", mTermMinSize);
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345 |
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346 | mTermMinSize = sqr(mTermMinSize);
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347 |
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348 | environment->GetFloatValue("VspKdTree.epsilon", mEpsilon);
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349 | environment->GetFloatValue("VspKdTree.ct_div_ci", mCtDivCi);
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350 |
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351 | environment->GetFloatValue("VspKdTree.maxTotalMemory", mMaxTotalMemory);
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352 | environment->GetFloatValue("VspKdTree.maxStaticMemory", mMaxStaticMemory);
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353 |
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354 | environment->GetIntValue("VspKdTree.accessTimeThreshold", mAccessTimeThreshold);
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355 | environment->GetIntValue("VspKdTree.minCollapseDepth", mMinCollapseDepth);
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356 |
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357 | //environment->GetIntValue("ViewCells.maxViewCells", mMaxViewCells);
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358 |
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359 | environment->GetIntValue("VspKdTree.PostProcess.minViewCells", mMinViewCells);
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360 | environment->GetFloatValue("VspKdTree.PostProcess.maxCostRatio", mMaxCostRatio);
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361 | environment->GetIntValue("VspKdTree.PostProcess.maxPvsSize",
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362 | MergeCandidate::sMaxPvsSize);
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363 |
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364 | // split type
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365 | char sname[128];
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366 | environment->GetStringValue("VspKdTree.splitType", sname);
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367 | string name(sname);
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368 |
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369 | Debug << "======= vsp kd tree options ========" << endl;
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370 | Debug << "max depth: "<< mTermMaxDepth << endl;
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371 | Debug << "min pvs: "<< mTermMinPvs << endl;
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372 | Debug << "min rays: "<< mTermMinRays << endl;
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373 | Debug << "max ray contribution: "<< mTermMaxRayContribution << endl;
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374 | Debug << "max cost ratio: "<< mTermMaxCostRatio << endl;
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375 | Debug << "min size: "<<mTermMinSize << endl;
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376 |
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377 | if (name.compare("regular") == 0)
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378 | {
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379 | Debug << "using regular split" << endl;
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380 | splitType = ESplitRegular;
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381 | }
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382 | else
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383 | {
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384 | if (name.compare("heuristic") == 0)
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385 | {
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386 | Debug << "using heuristic split" << endl;
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387 | splitType = ESplitHeuristic;
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388 | }
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389 | else
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390 | {
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391 | cerr << "Invalid VspKdTree split type " << name << endl;
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392 | exit(1);
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393 | }
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394 | }
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395 |
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396 | mRoot = NULL;
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397 |
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398 | mSplitCandidates = new vector<SortableEntry>;
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399 | }
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400 |
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401 |
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402 | VspKdTree::~VspKdTree()
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403 | {
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404 | DEL_PTR(mRoot);
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405 | DEL_PTR(mSplitCandidates);
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406 | }
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407 |
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408 | void VspKdStatistics::Print(ostream &app) const
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409 | {
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410 | app << "===== VspKdTree statistics ===============\n";
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411 |
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412 | app << "#N_RAYS ( Number of rays )\n"
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413 | << rays << endl;
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414 |
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415 | app << "#N_INITPVS ( Initial PVS size )\n"
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416 | << initialPvsSize << endl;
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417 |
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418 | app << "#N_NODES ( Number of nodes )\n" << nodes << "\n";
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419 |
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420 | app << "#N_LEAVES ( Number of leaves )\n" << Leaves() << "\n";
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421 |
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422 | app << "#N_SPLITS ( Number of splits in axes x y z dx dy dz \n";
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423 |
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424 | for (int i=0; i<7; i++)
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425 | app << splits[i] <<" ";
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426 | app << endl;
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427 |
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428 | app << "#N_RAYREFS ( Number of rayRefs )\n" <<
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429 | rayRefs << "\n";
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430 |
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431 | app << "#N_RAYRAYREFS ( Number of rayRefs / ray )\n" <<
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432 | rayRefs / (double)rays << "\n";
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433 |
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434 | app << "#N_LEAFRAYREFS ( Number of rayRefs / leaf )\n" <<
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435 | rayRefs / (double)Leaves() << "\n";
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436 |
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437 | app << "#N_MAXRAYREFS ( Max number of rayRefs / leaf )\n" <<
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438 | maxRayRefs << "\n";
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439 |
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440 | // app << setprecision(4);
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441 |
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442 | app << "#N_PMAXDEPTHLEAVES ( Percentage of leaves at maxdepth )\n" <<
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443 | maxDepthNodes * 100 / (double)Leaves() << endl;
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444 |
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445 | app << "#N_PMINPVSLEAVES ( Percentage of leaves with mininimal PVS )\n" <<
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446 | minPvsNodes * 100 / (double)Leaves() << endl;
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447 |
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448 | app << "#N_PMINRAYSLEAVES ( Percentage of leaves with minimal number of rays)\n" <<
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449 | minRaysNodes * 100 / (double)Leaves() << endl;
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450 |
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451 | app << "#N_PMINSIZELEAVES ( Percentage of leaves with minSize )\n"<<
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452 | minSizeNodes * 100 / (double)Leaves() << endl;
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453 |
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454 | app << "#N_PMAXRAYCONTRIBLEAVES ( Percentage of leaves with maximal ray contribution )\n" <<
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455 | maxRayContribNodes * 100 / (double)Leaves() << endl;
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456 |
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457 | app << "#N_ADDED_RAYREFS ( Number of dynamically added ray references )\n"<<
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458 | addedRayRefs << endl;
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459 |
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460 | app << "#N_REMOVED_RAYREFS ( Number of dynamically removed ray references )\n"<<
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461 | removedRayRefs << endl;
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462 |
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463 | // app << setprecision(4);
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464 |
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465 | app << "#N_( Maximal PVS size / leaf)\n"
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466 | << maxPvsSize << endl;
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467 |
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468 | app << "#N_CTIME ( Construction time [s] )\n"
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469 | << Time() << " \n";
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470 |
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471 | app << "===== END OF VspKdTree statistics ==========\n";
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472 | }
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473 |
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474 |
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475 | void VspKdTree::CollectViewCells(ViewCellContainer &viewCells) const
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476 | {
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477 | stack<VspKdNode *> nodeStack;
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478 | nodeStack.push(mRoot);
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479 |
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480 | ViewCell::NewMail();
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481 |
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482 | while (!nodeStack.empty())
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483 | {
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484 | VspKdNode *node = nodeStack.top();
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485 | nodeStack.pop();
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486 |
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487 | if (node->IsLeaf())
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488 | {
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489 | ViewCell *viewCell = dynamic_cast<VspKdLeaf *>(node)->mViewCell;
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490 |
|
---|
491 | if (!viewCell->Mailed())
|
---|
492 | {
|
---|
493 | viewCell->Mail();
|
---|
494 | viewCells.push_back(viewCell);
|
---|
495 | }
|
---|
496 | }
|
---|
497 | else
|
---|
498 | {
|
---|
499 | VspKdInterior *interior = dynamic_cast<VspKdInterior *>(node);
|
---|
500 |
|
---|
501 | nodeStack.push(interior->GetFront());
|
---|
502 | nodeStack.push(interior->GetBack());
|
---|
503 | }
|
---|
504 | }
|
---|
505 | }
|
---|
506 |
|
---|
507 | void VspKdTree::Construct(const VssRayContainer &rays,
|
---|
508 | AxisAlignedBox3 *forcedBoundingBox)
|
---|
509 | {
|
---|
510 | mStat.Start();
|
---|
511 |
|
---|
512 | mMaxMemory = mMaxStaticMemory;
|
---|
513 | DEL_PTR(mRoot);
|
---|
514 |
|
---|
515 | mRoot = new VspKdLeaf(NULL, (int)rays.size());
|
---|
516 |
|
---|
517 | // first construct a leaf that will get subdivided
|
---|
518 | VspKdLeaf *leaf = dynamic_cast<VspKdLeaf *>(mRoot);
|
---|
519 |
|
---|
520 | mStat.nodes = 1;
|
---|
521 | mBox.Initialize();
|
---|
522 |
|
---|
523 | //-- compute bounding box
|
---|
524 | if (forcedBoundingBox)
|
---|
525 | mBox = *forcedBoundingBox;
|
---|
526 | else
|
---|
527 | for (VssRayContainer::const_iterator ri = rays.begin(); ri != rays.end(); ++ ri)
|
---|
528 | {
|
---|
529 | if ((*ri)->mOriginObject)
|
---|
530 | mBox.Include((*ri)->GetOrigin());
|
---|
531 | if ((*ri)->mTerminationObject)
|
---|
532 | mBox.Include((*ri)->GetTermination());
|
---|
533 | }
|
---|
534 |
|
---|
535 | Debug << "bbox = " << mBox << endl;
|
---|
536 |
|
---|
537 | for (VssRayContainer::const_iterator ri = rays.begin(); ri != rays.end(); ++ ri)
|
---|
538 | {
|
---|
539 | //leaf->AddRay(RayInfo(*ri));
|
---|
540 | VssRay *ray = *ri;
|
---|
541 |
|
---|
542 | float minT, maxT;
|
---|
543 |
|
---|
544 | // TODO: not very efficient to implictly cast between rays types ...
|
---|
545 | if (mBox.GetRaySegment(*ray, minT, maxT))
|
---|
546 | {
|
---|
547 | float len = ray->Length();
|
---|
548 |
|
---|
549 | if (!len)
|
---|
550 | len = Limits::Small;
|
---|
551 |
|
---|
552 | leaf->AddRay(RayInfo(ray, minT / len, maxT / len));
|
---|
553 | }
|
---|
554 | }
|
---|
555 |
|
---|
556 | mStat.rays = (int)leaf->mRays.size();
|
---|
557 | leaf->UpdatePvsSize();
|
---|
558 |
|
---|
559 | mStat.initialPvsSize = leaf->GetPvsSize();
|
---|
560 |
|
---|
561 | // Subdivide();
|
---|
562 | mRoot = Subdivide(TraversalData(leaf, mBox, 0));
|
---|
563 |
|
---|
564 | if (mSplitCandidates)
|
---|
565 | {
|
---|
566 | // force release of this vector
|
---|
567 | delete mSplitCandidates;
|
---|
568 | mSplitCandidates = new vector<SortableEntry>;
|
---|
569 | }
|
---|
570 |
|
---|
571 | mStat.Stop();
|
---|
572 |
|
---|
573 | mStat.Print(cout);
|
---|
574 | Debug << "#Total memory=" << GetMemUsage() << endl;
|
---|
575 | }
|
---|
576 |
|
---|
577 |
|
---|
578 |
|
---|
579 | VspKdNode *VspKdTree::Subdivide(const TraversalData &tdata)
|
---|
580 | {
|
---|
581 | VspKdNode *result = NULL;
|
---|
582 |
|
---|
583 | priority_queue<TraversalData> tStack;
|
---|
584 | //stack<TraversalData> tStack;
|
---|
585 |
|
---|
586 | tStack.push(tdata);
|
---|
587 |
|
---|
588 | AxisAlignedBox3 backBox;
|
---|
589 | AxisAlignedBox3 frontBox;
|
---|
590 |
|
---|
591 | int lastMem = 0;
|
---|
592 |
|
---|
593 | while (!tStack.empty())
|
---|
594 | {
|
---|
595 | float mem = GetMemUsage();
|
---|
596 |
|
---|
597 | if (lastMem / 10 != ((int)mem) / 10)
|
---|
598 | {
|
---|
599 | Debug << mem << " MB" << endl;
|
---|
600 | }
|
---|
601 | lastMem = (int)mem;
|
---|
602 |
|
---|
603 | if (1 && mem > mMaxMemory)
|
---|
604 | {
|
---|
605 | Debug << "memory limit reached: " << mem << endl;
|
---|
606 | // count statistics on unprocessed leafs
|
---|
607 | while (!tStack.empty())
|
---|
608 | {
|
---|
609 | EvaluateLeafStats(tStack.top());
|
---|
610 | tStack.pop();
|
---|
611 | }
|
---|
612 | break;
|
---|
613 | }
|
---|
614 |
|
---|
615 | TraversalData data = tStack.top();
|
---|
616 | tStack.pop();
|
---|
617 |
|
---|
618 | VspKdNode *node = SubdivideNode((VspKdLeaf *) data.mNode,
|
---|
619 | data.mBox, backBox, frontBox);
|
---|
620 | if (result == NULL)
|
---|
621 | result = node;
|
---|
622 |
|
---|
623 | if (!node->IsLeaf())
|
---|
624 | {
|
---|
625 | VspKdInterior *interior = dynamic_cast<VspKdInterior *>(node);
|
---|
626 |
|
---|
627 | // push the children on the stack
|
---|
628 | tStack.push(TraversalData(interior->GetBack(), backBox, data.mDepth + 1));
|
---|
629 | tStack.push(TraversalData(interior->GetFront(), frontBox, data.mDepth + 1));
|
---|
630 | }
|
---|
631 | else
|
---|
632 | {
|
---|
633 | EvaluateLeafStats(data);
|
---|
634 | }
|
---|
635 | }
|
---|
636 |
|
---|
637 | return result;
|
---|
638 | }
|
---|
639 |
|
---|
640 |
|
---|
641 | // returns selected plane for subdivision
|
---|
642 | int VspKdTree::SelectPlane(VspKdLeaf *leaf,
|
---|
643 | const AxisAlignedBox3 &box,
|
---|
644 | float &position,
|
---|
645 | int &raysBack,
|
---|
646 | int &raysFront,
|
---|
647 | int &pvsBack,
|
---|
648 | int &pvsFront)
|
---|
649 | {
|
---|
650 | int minDirDepth = 6;
|
---|
651 | int axis = 0;
|
---|
652 | float costRatio = 0;
|
---|
653 |
|
---|
654 | if (splitType == ESplitRegular)
|
---|
655 | {
|
---|
656 | costRatio = BestCostRatioRegular(leaf,
|
---|
657 | axis,
|
---|
658 | position,
|
---|
659 | raysBack,
|
---|
660 | raysFront,
|
---|
661 | pvsBack,
|
---|
662 | pvsFront);
|
---|
663 | }
|
---|
664 | else if (splitType == ESplitHeuristic)
|
---|
665 | {
|
---|
666 | costRatio = BestCostRatioHeuristic(leaf,
|
---|
667 | axis,
|
---|
668 | position,
|
---|
669 | raysBack,
|
---|
670 | raysFront,
|
---|
671 | pvsBack,
|
---|
672 | pvsFront);
|
---|
673 | }
|
---|
674 | else
|
---|
675 | {
|
---|
676 | cerr << "VspKdTree: Unknown split heuristics\n";
|
---|
677 | exit(1);
|
---|
678 | }
|
---|
679 |
|
---|
680 | if (costRatio > mTermMaxCostRatio)
|
---|
681 | {
|
---|
682 | Debug << "Too big cost ratio " << costRatio << endl;
|
---|
683 | return -1;
|
---|
684 | }
|
---|
685 |
|
---|
686 | if (0)
|
---|
687 | Debug << "pvs=" << leaf->mPvsSize
|
---|
688 | << " rays=" << (int)leaf->mRays.size()
|
---|
689 | << " rc=" << leaf->GetAvgRayContribution()
|
---|
690 | << " axis=" << axis << endl;
|
---|
691 |
|
---|
692 | return axis;
|
---|
693 | }
|
---|
694 |
|
---|
695 |
|
---|
696 |
|
---|
697 | float VspKdTree::EvalCostRatio(VspKdLeaf *leaf,
|
---|
698 | const int axis,
|
---|
699 | const float position,
|
---|
700 | int &raysBack,
|
---|
701 | int &raysFront,
|
---|
702 | int &pvsBack,
|
---|
703 | int &pvsFront)
|
---|
704 | {
|
---|
705 | raysBack = 0;
|
---|
706 | raysFront = 0;
|
---|
707 | pvsFront = 0;
|
---|
708 | pvsBack = 0;
|
---|
709 |
|
---|
710 | float newCost;
|
---|
711 |
|
---|
712 | Intersectable::NewMail(3);
|
---|
713 |
|
---|
714 | // eval pvs size
|
---|
715 | int pvsSize = leaf->GetPvsSize();
|
---|
716 |
|
---|
717 | Intersectable::NewMail(3);
|
---|
718 |
|
---|
719 | // this is the main ray classification loop!
|
---|
720 | for(RayInfoContainer::iterator ri = leaf->mRays.begin();
|
---|
721 | ri != leaf->mRays.end(); ++ ri)
|
---|
722 | {
|
---|
723 | if (!(*ri).mRay->IsActive())
|
---|
724 | continue;
|
---|
725 |
|
---|
726 | // determine the side of this ray with respect to the plane
|
---|
727 | float t;
|
---|
728 | int side = (*ri).ComputeRayIntersection(axis, position, t);
|
---|
729 | // (*ri).mRay->mSide = side;
|
---|
730 |
|
---|
731 | if (side <= 0)
|
---|
732 | ++ raysBack;
|
---|
733 |
|
---|
734 | if (side >= 0)
|
---|
735 | ++ raysFront;
|
---|
736 |
|
---|
737 | AddObject2Pvs((*ri).mRay->mTerminationObject, side, pvsBack, pvsFront);
|
---|
738 | }
|
---|
739 |
|
---|
740 | if (0)
|
---|
741 | {
|
---|
742 | const float sum = float(pvsBack + pvsFront);
|
---|
743 | const float oldCost = (float)pvsSize * 2;
|
---|
744 |
|
---|
745 | return sum / oldCost;
|
---|
746 | }
|
---|
747 | else
|
---|
748 | {
|
---|
749 | AxisAlignedBox3 box = GetBBox(leaf);
|
---|
750 |
|
---|
751 | float minBox = box.Min(axis);
|
---|
752 | float maxBox = box.Max(axis);
|
---|
753 | float sizeBox = maxBox - minBox;
|
---|
754 |
|
---|
755 | // float sum = raysBack*(position - minBox) + raysFront*(maxBox - position);
|
---|
756 | const float sum = pvsBack * (position - minBox) + pvsFront * (maxBox - position);
|
---|
757 |
|
---|
758 | newCost = mCtDivCi + sum / sizeBox;
|
---|
759 |
|
---|
760 | //Debug << axis << " " << pvsSize << " " << pvsBack << " " << pvsFront << endl;
|
---|
761 | // float oldCost = leaf->mRays.size();
|
---|
762 | const float oldCost = (float)pvsSize;
|
---|
763 |
|
---|
764 | return newCost / oldCost;
|
---|
765 | }
|
---|
766 | }
|
---|
767 |
|
---|
768 | float VspKdTree::BestCostRatioRegular(VspKdLeaf *leaf,
|
---|
769 | int &axis,
|
---|
770 | float &position,
|
---|
771 | int &raysBack,
|
---|
772 | int &raysFront,
|
---|
773 | int &pvsBack,
|
---|
774 | int &pvsFront)
|
---|
775 | {
|
---|
776 | int nRaysBack[3], nRaysFront[3];
|
---|
777 | int nPvsBack[3], nPvsFront[3];
|
---|
778 |
|
---|
779 | float nPosition[3];
|
---|
780 | float nCostRatio[3];
|
---|
781 | int bestAxis = -1;
|
---|
782 |
|
---|
783 | AxisAlignedBox3 sBox = GetBBox(leaf);
|
---|
784 |
|
---|
785 | const int sAxis = sBox.Size().DrivingAxis();
|
---|
786 |
|
---|
787 | for (axis = 0; axis < 3; ++ axis)
|
---|
788 | {
|
---|
789 | if (!mOnlyDrivingAxis || axis == sAxis)
|
---|
790 | {
|
---|
791 |
|
---|
792 | nPosition[axis] = (sBox.Min()[axis] + sBox.Max()[axis]) * 0.5f;
|
---|
793 |
|
---|
794 | nCostRatio[axis] = EvalCostRatio(leaf,
|
---|
795 | axis,
|
---|
796 | nPosition[axis],
|
---|
797 | nRaysBack[axis],
|
---|
798 | nRaysFront[axis],
|
---|
799 | nPvsBack[axis],
|
---|
800 | nPvsFront[axis]);
|
---|
801 | if (bestAxis == -1)
|
---|
802 | {
|
---|
803 | bestAxis = axis;
|
---|
804 | }
|
---|
805 | else if (nCostRatio[axis] < nCostRatio[bestAxis])
|
---|
806 | {
|
---|
807 | /*Debug << "pvs front " << nPvsBack[axis]
|
---|
808 | << " pvs back " << nPvsFront[axis]
|
---|
809 | << " overall pvs " << leaf->GetPvsSize() << endl;*/
|
---|
810 | bestAxis = axis;
|
---|
811 | }
|
---|
812 |
|
---|
813 | }
|
---|
814 | }
|
---|
815 |
|
---|
816 | //-- assign best axis
|
---|
817 | axis = bestAxis;
|
---|
818 | position = nPosition[bestAxis];
|
---|
819 |
|
---|
820 | raysBack = nRaysBack[bestAxis];
|
---|
821 | raysFront = nRaysFront[bestAxis];
|
---|
822 |
|
---|
823 | pvsBack = nPvsBack[bestAxis];
|
---|
824 | pvsFront = nPvsFront[bestAxis];
|
---|
825 |
|
---|
826 | return nCostRatio[bestAxis];
|
---|
827 | }
|
---|
828 |
|
---|
829 | float VspKdTree::BestCostRatioHeuristic(VspKdLeaf *leaf,
|
---|
830 | int &axis,
|
---|
831 | float &position,
|
---|
832 | int &raysBack,
|
---|
833 | int &raysFront,
|
---|
834 | int &pvsBack,
|
---|
835 | int &pvsFront)
|
---|
836 | {
|
---|
837 | AxisAlignedBox3 box = GetBBox(leaf);
|
---|
838 | // AxisAlignedBox3 dirBox = GetDirBBox(node);
|
---|
839 |
|
---|
840 | axis = box.Size().DrivingAxis();
|
---|
841 |
|
---|
842 | SortSplitCandidates(leaf, axis);
|
---|
843 |
|
---|
844 | // go through the lists, count the number of objects left and right
|
---|
845 | // and evaluate the following cost funcion:
|
---|
846 | // C = ct_div_ci + (ql*rl + qr*rr)/queries
|
---|
847 |
|
---|
848 | int rl = 0, rr = (int)leaf->mRays.size();
|
---|
849 | int pl = 0, pr = leaf->GetPvsSize();
|
---|
850 |
|
---|
851 | float minBox = box.Min(axis);
|
---|
852 | float maxBox = box.Max(axis);
|
---|
853 | float sizeBox = maxBox - minBox;
|
---|
854 |
|
---|
855 | float minBand = minBox + 0.1f*(maxBox - minBox);
|
---|
856 | float maxBand = minBox + 0.9f*(maxBox - minBox);
|
---|
857 |
|
---|
858 | float sum = rr*sizeBox;
|
---|
859 | float minSum = 1e20f;
|
---|
860 |
|
---|
861 | Intersectable::NewMail();
|
---|
862 |
|
---|
863 | // set all object as belonging to the fron pvs
|
---|
864 | for(RayInfoContainer::iterator ri = leaf->mRays.begin();
|
---|
865 | ri != leaf->mRays.end(); ++ ri)
|
---|
866 | {
|
---|
867 | if ((*ri).mRay->IsActive())
|
---|
868 | {
|
---|
869 | Intersectable *object = (*ri).mRay->mTerminationObject;
|
---|
870 |
|
---|
871 | if (object)
|
---|
872 | if (!object->Mailed())
|
---|
873 | {
|
---|
874 | object->Mail();
|
---|
875 | object->mCounter = 1;
|
---|
876 | }
|
---|
877 | else
|
---|
878 | ++ object->mCounter;
|
---|
879 | }
|
---|
880 | }
|
---|
881 |
|
---|
882 | Intersectable::NewMail();
|
---|
883 |
|
---|
884 | for (vector<SortableEntry>::const_iterator ci = mSplitCandidates->begin();
|
---|
885 | ci < mSplitCandidates->end(); ++ ci)
|
---|
886 | {
|
---|
887 | VssRay *ray;
|
---|
888 |
|
---|
889 | switch ((*ci).type)
|
---|
890 | {
|
---|
891 | case SortableEntry::ERayMin:
|
---|
892 | {
|
---|
893 | ++ rl;
|
---|
894 | ray = (VssRay *) (*ci).data;
|
---|
895 | Intersectable *object = ray->mTerminationObject;
|
---|
896 | if (object && !object->Mailed())
|
---|
897 | {
|
---|
898 | object->Mail();
|
---|
899 | ++ pl;
|
---|
900 | }
|
---|
901 | break;
|
---|
902 | }
|
---|
903 | case SortableEntry::ERayMax:
|
---|
904 | {
|
---|
905 | -- rr;
|
---|
906 |
|
---|
907 | ray = (VssRay *) (*ci).data;
|
---|
908 | Intersectable *object = ray->mTerminationObject;
|
---|
909 |
|
---|
910 | if (object)
|
---|
911 | {
|
---|
912 | if (-- object->mCounter == 0)
|
---|
913 | -- pr;
|
---|
914 | }
|
---|
915 |
|
---|
916 | break;
|
---|
917 | }
|
---|
918 | }
|
---|
919 |
|
---|
920 | if ((*ci).value > minBand && (*ci).value < maxBand)
|
---|
921 | {
|
---|
922 | sum = pl*((*ci).value - minBox) + pr*(maxBox - (*ci).value);
|
---|
923 |
|
---|
924 | // cout<<"pos="<<(*ci).value<<"\t q=("<<ql<<","<<qr<<")\t r=("<<rl<<","<<rr<<")"<<endl;
|
---|
925 | // cout<<"cost= "<<sum<<endl;
|
---|
926 |
|
---|
927 | if (sum < minSum)
|
---|
928 | {
|
---|
929 | minSum = sum;
|
---|
930 | position = (*ci).value;
|
---|
931 |
|
---|
932 | raysBack = rl;
|
---|
933 | raysFront = rr;
|
---|
934 |
|
---|
935 | pvsBack = pl;
|
---|
936 | pvsFront = pr;
|
---|
937 |
|
---|
938 | }
|
---|
939 | }
|
---|
940 | }
|
---|
941 |
|
---|
942 | float oldCost = (float)leaf->GetPvsSize();
|
---|
943 | float newCost = mCtDivCi + minSum / sizeBox;
|
---|
944 | float ratio = newCost / oldCost;
|
---|
945 |
|
---|
946 | //Debug << "costRatio=" << ratio << " pos=" << position << " t=" << (position - minBox) / (maxBox - minBox)
|
---|
947 | // <<"\t q=(" << queriesBack << "," << queriesFront << ")\t r=(" << raysBack << "," << raysFront << ")" << endl;
|
---|
948 |
|
---|
949 | return ratio;
|
---|
950 | }
|
---|
951 |
|
---|
952 | void VspKdTree::SortSplitCandidates(VspKdLeaf *node,
|
---|
953 | const int axis)
|
---|
954 | {
|
---|
955 | mSplitCandidates->clear();
|
---|
956 |
|
---|
957 | int requestedSize = 2 * (int)(node->mRays.size());
|
---|
958 | // creates a sorted split candidates array
|
---|
959 | if (mSplitCandidates->capacity() > 500000 &&
|
---|
960 | requestedSize < (int)(mSplitCandidates->capacity()/10) )
|
---|
961 | {
|
---|
962 | DEL_PTR(mSplitCandidates);
|
---|
963 | mSplitCandidates = new vector<SortableEntry>;
|
---|
964 | }
|
---|
965 |
|
---|
966 | mSplitCandidates->reserve(requestedSize);
|
---|
967 |
|
---|
968 | // insert all queries
|
---|
969 | for(RayInfoContainer::const_iterator ri = node->mRays.begin();
|
---|
970 | ri < node->mRays.end(); ++ ri)
|
---|
971 | {
|
---|
972 | bool positive = (*ri).mRay->HasPosDir(axis);
|
---|
973 | mSplitCandidates->push_back(SortableEntry(positive ? SortableEntry::ERayMin : SortableEntry::ERayMax,
|
---|
974 | (*ri).ExtrapOrigin(axis), (void *)&*ri));
|
---|
975 |
|
---|
976 | mSplitCandidates->push_back(SortableEntry(positive ? SortableEntry::ERayMax : SortableEntry::ERayMin,
|
---|
977 | (*ri).ExtrapTermination(axis), (void *)&*ri));
|
---|
978 | }
|
---|
979 |
|
---|
980 | stable_sort(mSplitCandidates->begin(), mSplitCandidates->end());
|
---|
981 | }
|
---|
982 |
|
---|
983 |
|
---|
984 | void VspKdTree::EvaluateLeafStats(const TraversalData &data)
|
---|
985 | {
|
---|
986 | // the node became a leaf -> evaluate stats for leafs
|
---|
987 | VspKdLeaf *leaf = dynamic_cast<VspKdLeaf *>(data.mNode);
|
---|
988 |
|
---|
989 | if (leaf->GetPvsSize() > mStat.maxPvsSize)
|
---|
990 | mStat.maxPvsSize = leaf->GetPvsSize();
|
---|
991 |
|
---|
992 | if ((int)(leaf->mRays.size()) > mStat.maxRayRefs)
|
---|
993 | mStat.maxRayRefs = (int)leaf->mRays.size();
|
---|
994 |
|
---|
995 |
|
---|
996 | if (data.mDepth >= mTermMaxDepth)
|
---|
997 | ++ mStat.maxDepthNodes;
|
---|
998 |
|
---|
999 | if (leaf->GetPvsSize() < mTermMinPvs)
|
---|
1000 | ++ mStat.minPvsNodes;
|
---|
1001 |
|
---|
1002 | if ((int)leaf->GetRays().size() < mTermMinRays)
|
---|
1003 | ++ mStat.minRaysNodes;
|
---|
1004 |
|
---|
1005 | if (leaf->GetAvgRayContribution() > mTermMaxRayContribution)
|
---|
1006 | ++ mStat.maxRayContribNodes;
|
---|
1007 |
|
---|
1008 | if (SqrMagnitude(data.mBox.Size()) <= mTermMinSize)
|
---|
1009 | ++ mStat.minSizeNodes;
|
---|
1010 | }
|
---|
1011 |
|
---|
1012 |
|
---|
1013 | inline bool VspKdTree::TerminationCriteriaMet(const VspKdLeaf *leaf,
|
---|
1014 | const AxisAlignedBox3 &box) const
|
---|
1015 | {
|
---|
1016 | return ((leaf->GetPvsSize() < mTermMinPvs) ||
|
---|
1017 | (leaf->mRays.size() < mTermMinRays) ||
|
---|
1018 | //(leaf->GetAvgRayContribution() > mTermMaxRayContribution ) ||
|
---|
1019 | (leaf->mDepth >= mTermMaxDepth) ||
|
---|
1020 | (SqrMagnitude(box.Size()) <= mTermMinSize));
|
---|
1021 | }
|
---|
1022 |
|
---|
1023 |
|
---|
1024 | VspKdNode *VspKdTree::SubdivideNode(VspKdLeaf *leaf,
|
---|
1025 | const AxisAlignedBox3 &box,
|
---|
1026 | AxisAlignedBox3 &backBBox,
|
---|
1027 | AxisAlignedBox3 &frontBBox)
|
---|
1028 | {
|
---|
1029 | if (TerminationCriteriaMet(leaf, box))
|
---|
1030 | {
|
---|
1031 | if (1 && leaf->mDepth >= mTermMaxDepth)
|
---|
1032 | {
|
---|
1033 | Debug << "Warning: max depth reached depth=" << (int)leaf->mDepth<<" rays=" << (int)leaf->mRays.size() << endl;
|
---|
1034 | Debug << "Bbox: " << GetBBox(leaf) << endl;
|
---|
1035 | }
|
---|
1036 | //Debug << "depth: " << (int)leaf->mDepth << " pvs: " << leaf->GetPvsSize() << " rays: " << leaf->mRays.size() << endl;
|
---|
1037 |
|
---|
1038 | return leaf;
|
---|
1039 | }
|
---|
1040 |
|
---|
1041 | float position;
|
---|
1042 | // first count ray sides
|
---|
1043 | int raysBack;
|
---|
1044 | int raysFront;
|
---|
1045 | int pvsBack;
|
---|
1046 | int pvsFront;
|
---|
1047 |
|
---|
1048 | // select subdivision axis
|
---|
1049 | const int axis = SelectPlane(leaf, box, position, raysBack, raysFront, pvsBack, pvsFront);
|
---|
1050 |
|
---|
1051 | //Debug << "rays back=" << raysBack << " rays front=" << raysFront << " pvs back=" << pvsBack << " pvs front=" << pvsFront << endl;
|
---|
1052 |
|
---|
1053 | if (axis == -1)
|
---|
1054 | {
|
---|
1055 | return leaf;
|
---|
1056 | }
|
---|
1057 |
|
---|
1058 | mStat.nodes += 2;
|
---|
1059 | //++ mStat.splits[axis];
|
---|
1060 |
|
---|
1061 | // add the new nodes to the tree
|
---|
1062 | VspKdInterior *node = new VspKdInterior(leaf->mParent);
|
---|
1063 |
|
---|
1064 | node->mAxis = axis;
|
---|
1065 | node->mPosition = position;
|
---|
1066 | node->mBox = box;
|
---|
1067 |
|
---|
1068 | backBBox = box;
|
---|
1069 | frontBBox = box;
|
---|
1070 |
|
---|
1071 | VspKdLeaf *back = new VspKdLeaf(node, raysBack);
|
---|
1072 | back->SetPvsSize(pvsBack);
|
---|
1073 | VspKdLeaf *front = new VspKdLeaf(node, raysFront);
|
---|
1074 | front->SetPvsSize(pvsFront);
|
---|
1075 |
|
---|
1076 | // replace a link from node's parent
|
---|
1077 | if (leaf->mParent)
|
---|
1078 | leaf->mParent->ReplaceChildLink(leaf, node);
|
---|
1079 | // and setup child links
|
---|
1080 | node->SetupChildLinks(back, front);
|
---|
1081 |
|
---|
1082 | if (axis <= VspKdNode::SPLIT_Z)
|
---|
1083 | {
|
---|
1084 | backBBox.SetMax(axis, position);
|
---|
1085 | frontBBox.SetMin(axis, position);
|
---|
1086 |
|
---|
1087 | for(RayInfoContainer::iterator ri = leaf->mRays.begin();
|
---|
1088 | ri != leaf->mRays.end(); ++ ri)
|
---|
1089 | {
|
---|
1090 | if ((*ri).mRay->IsActive())
|
---|
1091 | {
|
---|
1092 | // first unref ray from the former leaf
|
---|
1093 | (*ri).mRay->Unref();
|
---|
1094 | float t;
|
---|
1095 | // determine the side of this ray with respect to the plane
|
---|
1096 | int side = node->ComputeRayIntersection(*ri, t);
|
---|
1097 |
|
---|
1098 | if (side == 0)
|
---|
1099 | {
|
---|
1100 | if ((*ri).mRay->HasPosDir(axis))
|
---|
1101 | {
|
---|
1102 | back->AddRay(RayInfo((*ri).mRay,
|
---|
1103 | (*ri).mMinT,
|
---|
1104 | t));
|
---|
1105 | front->AddRay(RayInfo((*ri).mRay,
|
---|
1106 | t,
|
---|
1107 | (*ri).mMaxT));
|
---|
1108 | }
|
---|
1109 | else
|
---|
1110 | {
|
---|
1111 | back->AddRay(RayInfo((*ri).mRay,
|
---|
1112 | t,
|
---|
1113 | (*ri).mMaxT));
|
---|
1114 | front->AddRay(RayInfo((*ri).mRay,
|
---|
1115 | (*ri).mMinT,
|
---|
1116 | t));
|
---|
1117 | }
|
---|
1118 | }
|
---|
1119 | else
|
---|
1120 | if (side == 1)
|
---|
1121 | front->AddRay(*ri);
|
---|
1122 | else
|
---|
1123 | back->AddRay(*ri);
|
---|
1124 | } else
|
---|
1125 | (*ri).mRay->Unref();
|
---|
1126 | }
|
---|
1127 | }
|
---|
1128 | else
|
---|
1129 | {
|
---|
1130 | // rays front/back
|
---|
1131 |
|
---|
1132 | for (RayInfoContainer::iterator ri = leaf->mRays.begin();
|
---|
1133 | ri != leaf->mRays.end(); ++ ri)
|
---|
1134 | {
|
---|
1135 | if ((*ri).mRay->IsActive())
|
---|
1136 | {
|
---|
1137 | // first unref ray from the former leaf
|
---|
1138 | (*ri).mRay->Unref();
|
---|
1139 |
|
---|
1140 | int side;
|
---|
1141 | if ((*ri).mRay->GetDirParametrization(axis - 3) > position)
|
---|
1142 | side = 1;
|
---|
1143 | else
|
---|
1144 | side = -1;
|
---|
1145 |
|
---|
1146 | if (side == 1)
|
---|
1147 | front->AddRay(*ri);
|
---|
1148 | else
|
---|
1149 | back->AddRay(*ri);
|
---|
1150 | }
|
---|
1151 | else
|
---|
1152 | (*ri).mRay->Unref();
|
---|
1153 | }
|
---|
1154 | }
|
---|
1155 |
|
---|
1156 | // update stats
|
---|
1157 | mStat.rayRefs -= (int)leaf->mRays.size();
|
---|
1158 | mStat.rayRefs += raysBack + raysFront;
|
---|
1159 |
|
---|
1160 | DEL_PTR(leaf);
|
---|
1161 |
|
---|
1162 | return node;
|
---|
1163 | }
|
---|
1164 |
|
---|
1165 | int VspKdTree::ReleaseMemory(const int time)
|
---|
1166 | {
|
---|
1167 | stack<VspKdNode *> tstack;
|
---|
1168 |
|
---|
1169 | // find a node in the tree which subtree will be collapsed
|
---|
1170 | int maxAccessTime = time - mAccessTimeThreshold;
|
---|
1171 | int released = 0;
|
---|
1172 |
|
---|
1173 | tstack.push(mRoot);
|
---|
1174 |
|
---|
1175 | while (!tstack.empty())
|
---|
1176 | {
|
---|
1177 | VspKdNode *node = tstack.top();
|
---|
1178 | tstack.pop();
|
---|
1179 |
|
---|
1180 | if (!node->IsLeaf())
|
---|
1181 | {
|
---|
1182 | VspKdInterior *in = dynamic_cast<VspKdInterior *>(node);
|
---|
1183 | // cout<<"depth="<<(int)in->depth<<" time="<<in->lastAccessTime<<endl;
|
---|
1184 | if (in->mDepth >= mMinCollapseDepth && in->mLastAccessTime <= maxAccessTime)
|
---|
1185 | {
|
---|
1186 | released = CollapseSubtree(node, time);
|
---|
1187 | break;
|
---|
1188 | }
|
---|
1189 | if (in->GetBack()->GetAccessTime() < in->GetFront()->GetAccessTime())
|
---|
1190 | {
|
---|
1191 | tstack.push(in->GetFront());
|
---|
1192 | tstack.push(in->GetBack());
|
---|
1193 | }
|
---|
1194 | else
|
---|
1195 | {
|
---|
1196 | tstack.push(in->GetBack());
|
---|
1197 | tstack.push(in->GetFront());
|
---|
1198 | }
|
---|
1199 | }
|
---|
1200 | }
|
---|
1201 |
|
---|
1202 | while (tstack.empty())
|
---|
1203 | {
|
---|
1204 | // could find node to collaps...
|
---|
1205 | // cout<<"Could not find a node to release "<<endl;
|
---|
1206 | break;
|
---|
1207 | }
|
---|
1208 |
|
---|
1209 | return released;
|
---|
1210 | }
|
---|
1211 |
|
---|
1212 |
|
---|
1213 | VspKdNode *VspKdTree::SubdivideLeaf(VspKdLeaf *leaf,
|
---|
1214 | const float sizeThreshold)
|
---|
1215 | {
|
---|
1216 | VspKdNode *node = leaf;
|
---|
1217 |
|
---|
1218 | AxisAlignedBox3 leafBBox = GetBBox(leaf);
|
---|
1219 |
|
---|
1220 | static int pass = 0;
|
---|
1221 | ++ pass;
|
---|
1222 |
|
---|
1223 | // check if we should perform a dynamic subdivision of the leaf
|
---|
1224 | if (// leaf->mRays.size() > (unsigned)termMinCost &&
|
---|
1225 | (leaf->GetPvsSize() >= mTermMinPvs) &&
|
---|
1226 | (SqrMagnitude(leafBBox.Size()) > sizeThreshold) )
|
---|
1227 | {
|
---|
1228 | // memory check and release
|
---|
1229 | if (GetMemUsage() > mMaxTotalMemory)
|
---|
1230 | ReleaseMemory(pass);
|
---|
1231 |
|
---|
1232 | AxisAlignedBox3 backBBox, frontBBox;
|
---|
1233 |
|
---|
1234 | // subdivide the node
|
---|
1235 | node = SubdivideNode(leaf, leafBBox, backBBox, frontBBox);
|
---|
1236 | }
|
---|
1237 | return node;
|
---|
1238 | }
|
---|
1239 |
|
---|
1240 |
|
---|
1241 |
|
---|
1242 | void VspKdTree::UpdateRays(VssRayContainer &remove,
|
---|
1243 | VssRayContainer &add)
|
---|
1244 | {
|
---|
1245 | VspKdLeaf::NewMail();
|
---|
1246 |
|
---|
1247 | // schedule rays for removal
|
---|
1248 | for(VssRayContainer::const_iterator ri = remove.begin();
|
---|
1249 | ri != remove.end(); ++ ri)
|
---|
1250 | {
|
---|
1251 | (*ri)->ScheduleForRemoval();
|
---|
1252 | }
|
---|
1253 |
|
---|
1254 | int inactive = 0;
|
---|
1255 |
|
---|
1256 | for (VssRayContainer::const_iterator ri = remove.begin(); ri != remove.end(); ++ ri)
|
---|
1257 | {
|
---|
1258 | if ((*ri)->ScheduledForRemoval())
|
---|
1259 | // RemoveRay(*ri, NULL, false);
|
---|
1260 | // !!! BUG - with true it does not work correctly - aggreated delete
|
---|
1261 | RemoveRay(*ri, NULL, true);
|
---|
1262 | else
|
---|
1263 | ++ inactive;
|
---|
1264 | }
|
---|
1265 |
|
---|
1266 | // cout<<"all/inactive"<<remove.size()<<"/"<<inactive<<endl;
|
---|
1267 | for (VssRayContainer::const_iterator ri = add.begin(); ri != add.end(); ++ ri)
|
---|
1268 | {
|
---|
1269 | AddRay(*ri);
|
---|
1270 | }
|
---|
1271 | }
|
---|
1272 |
|
---|
1273 |
|
---|
1274 | void VspKdTree::RemoveRay(VssRay *ray,
|
---|
1275 | vector<VspKdLeaf *> *affectedLeaves,
|
---|
1276 | const bool removeAllScheduledRays)
|
---|
1277 | {
|
---|
1278 | stack<RayTraversalData> tstack;
|
---|
1279 |
|
---|
1280 | tstack.push(RayTraversalData(mRoot, RayInfo(ray)));
|
---|
1281 |
|
---|
1282 | RayTraversalData data;
|
---|
1283 |
|
---|
1284 | // cout<<"Number of ray refs = "<<ray->RefCount()<<endl;
|
---|
1285 | while (!tstack.empty())
|
---|
1286 | {
|
---|
1287 | data = tstack.top();
|
---|
1288 | tstack.pop();
|
---|
1289 |
|
---|
1290 | if (!data.mNode->IsLeaf())
|
---|
1291 | {
|
---|
1292 | // split the set of rays in two groups intersecting the
|
---|
1293 | // two subtrees
|
---|
1294 | TraverseInternalNode(data, tstack);
|
---|
1295 | }
|
---|
1296 | else
|
---|
1297 | {
|
---|
1298 | // remove the ray from the leaf
|
---|
1299 | // find the ray in the leaf and swap it with the last ray...
|
---|
1300 | VspKdLeaf *leaf = (VspKdLeaf *)data.mNode;
|
---|
1301 |
|
---|
1302 | if (!leaf->Mailed())
|
---|
1303 | {
|
---|
1304 | leaf->Mail();
|
---|
1305 |
|
---|
1306 | if (affectedLeaves)
|
---|
1307 | affectedLeaves->push_back(leaf);
|
---|
1308 |
|
---|
1309 | if (removeAllScheduledRays)
|
---|
1310 | {
|
---|
1311 | int tail = (int)leaf->mRays.size() - 1;
|
---|
1312 |
|
---|
1313 | for (int i=0; i < (int)(leaf->mRays.size()); ++ i)
|
---|
1314 | {
|
---|
1315 | if (leaf->mRays[i].mRay->ScheduledForRemoval())
|
---|
1316 | {
|
---|
1317 | // find a ray to replace it with
|
---|
1318 | while (tail >= i && leaf->mRays[tail].mRay->ScheduledForRemoval())
|
---|
1319 | {
|
---|
1320 | ++ mStat.removedRayRefs;
|
---|
1321 | leaf->mRays[tail].mRay->Unref();
|
---|
1322 | leaf->mRays.pop_back();
|
---|
1323 |
|
---|
1324 | -- tail;
|
---|
1325 | }
|
---|
1326 |
|
---|
1327 | if (tail < i)
|
---|
1328 | break;
|
---|
1329 |
|
---|
1330 | ++ mStat.removedRayRefs;
|
---|
1331 |
|
---|
1332 | leaf->mRays[i].mRay->Unref();
|
---|
1333 | leaf->mRays[i] = leaf->mRays[tail];
|
---|
1334 | leaf->mRays.pop_back();
|
---|
1335 | -- tail;
|
---|
1336 | }
|
---|
1337 | }
|
---|
1338 | }
|
---|
1339 | }
|
---|
1340 |
|
---|
1341 | if (!removeAllScheduledRays)
|
---|
1342 | for (int i=0; i < (int)leaf->mRays.size(); i++)
|
---|
1343 | {
|
---|
1344 | if (leaf->mRays[i].mRay == ray)
|
---|
1345 | {
|
---|
1346 | ++ mStat.removedRayRefs;
|
---|
1347 | ray->Unref();
|
---|
1348 | leaf->mRays[i] = leaf->mRays[leaf->mRays.size() - 1];
|
---|
1349 | leaf->mRays.pop_back();
|
---|
1350 | // check this ray again
|
---|
1351 | break;
|
---|
1352 | }
|
---|
1353 | }
|
---|
1354 | }
|
---|
1355 | }
|
---|
1356 |
|
---|
1357 | if (ray->RefCount() != 0)
|
---|
1358 | {
|
---|
1359 | cerr << "Error: Number of remaining refs = " << ray->RefCount() << endl;
|
---|
1360 | exit(1);
|
---|
1361 | }
|
---|
1362 |
|
---|
1363 | }
|
---|
1364 |
|
---|
1365 | void VspKdTree::AddRay(VssRay *ray)
|
---|
1366 | {
|
---|
1367 | stack<RayTraversalData> tstack;
|
---|
1368 |
|
---|
1369 | tstack.push(RayTraversalData(mRoot, RayInfo(ray)));
|
---|
1370 |
|
---|
1371 | RayTraversalData data;
|
---|
1372 |
|
---|
1373 | while (!tstack.empty())
|
---|
1374 | {
|
---|
1375 | data = tstack.top();
|
---|
1376 | tstack.pop();
|
---|
1377 |
|
---|
1378 | if (!data.mNode->IsLeaf())
|
---|
1379 | {
|
---|
1380 | TraverseInternalNode(data, tstack);
|
---|
1381 | }
|
---|
1382 | else
|
---|
1383 | {
|
---|
1384 | // remove the ray from the leaf
|
---|
1385 | // find the ray in the leaf and swap it with the last ray
|
---|
1386 | VspKdLeaf *leaf = dynamic_cast<VspKdLeaf *>(data.mNode);
|
---|
1387 |
|
---|
1388 | leaf->AddRay(data.mRayData);
|
---|
1389 | ++ mStat.addedRayRefs;
|
---|
1390 | }
|
---|
1391 | }
|
---|
1392 | }
|
---|
1393 |
|
---|
1394 | void VspKdTree::TraverseInternalNode(RayTraversalData &data,
|
---|
1395 | stack<RayTraversalData> &tstack)
|
---|
1396 | {
|
---|
1397 | VspKdInterior *in = dynamic_cast<VspKdInterior *>(data.mNode);
|
---|
1398 |
|
---|
1399 | if (in->mAxis <= VspKdNode::SPLIT_Z)
|
---|
1400 | {
|
---|
1401 | // determine the side of this ray with respect to the plane
|
---|
1402 | float t;
|
---|
1403 | int side = in->ComputeRayIntersection(data.mRayData, t);
|
---|
1404 |
|
---|
1405 | if (side == 0)
|
---|
1406 | {
|
---|
1407 | if (data.mRayData.mRay->HasPosDir(in->mAxis))
|
---|
1408 | {
|
---|
1409 | tstack.push(RayTraversalData(in->GetBack(),
|
---|
1410 | RayInfo(data.mRayData.mRay, data.mRayData.mMinT, t)));
|
---|
1411 |
|
---|
1412 | tstack.push(RayTraversalData(in->GetFront(),
|
---|
1413 | RayInfo(data.mRayData.mRay, t, data.mRayData.mMaxT)));
|
---|
1414 |
|
---|
1415 | }
|
---|
1416 | else
|
---|
1417 | {
|
---|
1418 | tstack.push(RayTraversalData(in->GetBack(),
|
---|
1419 | RayInfo(data.mRayData.mRay,
|
---|
1420 | t,
|
---|
1421 | data.mRayData.mMaxT)));
|
---|
1422 | tstack.push(RayTraversalData(in->GetFront(),
|
---|
1423 | RayInfo(data.mRayData.mRay,
|
---|
1424 | data.mRayData.mMinT,
|
---|
1425 | t)));
|
---|
1426 | }
|
---|
1427 | }
|
---|
1428 | else
|
---|
1429 | if (side == 1)
|
---|
1430 | tstack.push(RayTraversalData(in->GetFront(), data.mRayData));
|
---|
1431 | else
|
---|
1432 | tstack.push(RayTraversalData(in->GetBack(), data.mRayData));
|
---|
1433 | }
|
---|
1434 | else
|
---|
1435 | {
|
---|
1436 | // directional split
|
---|
1437 | if (data.mRayData.mRay->GetDirParametrization(in->mAxis - 3) > in->mPosition)
|
---|
1438 | tstack.push(RayTraversalData(in->GetFront(), data.mRayData));
|
---|
1439 | else
|
---|
1440 | tstack.push(RayTraversalData(in->GetBack(), data.mRayData));
|
---|
1441 | }
|
---|
1442 | }
|
---|
1443 |
|
---|
1444 |
|
---|
1445 | int VspKdTree::CollapseSubtree(VspKdNode *sroot, const int time)
|
---|
1446 | {
|
---|
1447 | // first count all rays in the subtree
|
---|
1448 | // use mail 1 for this purpose
|
---|
1449 | stack<VspKdNode *> tstack;
|
---|
1450 |
|
---|
1451 | int rayCount = 0;
|
---|
1452 | int totalRayCount = 0;
|
---|
1453 | int collapsedNodes = 0;
|
---|
1454 |
|
---|
1455 | #if DEBUG_COLLAPSE
|
---|
1456 | cout << "Collapsing subtree" << endl;
|
---|
1457 | cout << "accessTime=" << sroot->GetAccessTime() << endl;
|
---|
1458 | cout << "depth=" << (int)sroot->depth << endl;
|
---|
1459 | #endif
|
---|
1460 |
|
---|
1461 | // tstat.collapsedSubtrees++;
|
---|
1462 | // tstat.collapseDepths += (int)sroot->depth;
|
---|
1463 | // tstat.collapseAccessTimes += time - sroot->GetAccessTime();
|
---|
1464 | tstack.push(sroot);
|
---|
1465 | VssRay::NewMail();
|
---|
1466 |
|
---|
1467 | while (!tstack.empty())
|
---|
1468 | {
|
---|
1469 | ++ collapsedNodes;
|
---|
1470 |
|
---|
1471 | VspKdNode *node = tstack.top();
|
---|
1472 | tstack.pop();
|
---|
1473 | if (node->IsLeaf())
|
---|
1474 | {
|
---|
1475 | VspKdLeaf *leaf = (VspKdLeaf *) node;
|
---|
1476 |
|
---|
1477 | for(RayInfoContainer::iterator ri = leaf->mRays.begin();
|
---|
1478 | ri != leaf->mRays.end(); ++ ri)
|
---|
1479 | {
|
---|
1480 | ++ totalRayCount;
|
---|
1481 |
|
---|
1482 | if ((*ri).mRay->IsActive() && !(*ri).mRay->Mailed())
|
---|
1483 | {
|
---|
1484 | (*ri).mRay->Mail();
|
---|
1485 | ++ rayCount;
|
---|
1486 | }
|
---|
1487 | }
|
---|
1488 | }
|
---|
1489 | else
|
---|
1490 | {
|
---|
1491 | tstack.push(((VspKdInterior *)node)->GetFront());
|
---|
1492 | tstack.push(((VspKdInterior *)node)->GetBack());
|
---|
1493 | }
|
---|
1494 | }
|
---|
1495 |
|
---|
1496 | VssRay::NewMail();
|
---|
1497 |
|
---|
1498 | // create a new node that will hold the rays
|
---|
1499 | VspKdLeaf *newLeaf = new VspKdLeaf(sroot->mParent, rayCount);
|
---|
1500 |
|
---|
1501 | if (newLeaf->mParent)
|
---|
1502 | newLeaf->mParent->ReplaceChildLink(sroot, newLeaf);
|
---|
1503 |
|
---|
1504 | tstack.push(sroot);
|
---|
1505 |
|
---|
1506 | while (!tstack.empty())
|
---|
1507 | {
|
---|
1508 | VspKdNode *node = tstack.top();
|
---|
1509 | tstack.pop();
|
---|
1510 |
|
---|
1511 | if (node->IsLeaf())
|
---|
1512 | {
|
---|
1513 | VspKdLeaf *leaf = dynamic_cast<VspKdLeaf *>(node);
|
---|
1514 |
|
---|
1515 | for(RayInfoContainer::iterator ri = leaf->mRays.begin();
|
---|
1516 | ri != leaf->mRays.end(); ++ ri)
|
---|
1517 | {
|
---|
1518 | // unref this ray from the old node
|
---|
1519 | if ((*ri).mRay->IsActive())
|
---|
1520 | {
|
---|
1521 | (*ri).mRay->Unref();
|
---|
1522 | if (!(*ri).mRay->Mailed())
|
---|
1523 | {
|
---|
1524 | (*ri).mRay->Mail();
|
---|
1525 | newLeaf->AddRay(*ri);
|
---|
1526 | }
|
---|
1527 | }
|
---|
1528 | else
|
---|
1529 | (*ri).mRay->Unref();
|
---|
1530 | }
|
---|
1531 | }
|
---|
1532 | else
|
---|
1533 | {
|
---|
1534 | VspKdInterior *interior =
|
---|
1535 | dynamic_cast<VspKdInterior *>(node);
|
---|
1536 | tstack.push(interior->GetBack());
|
---|
1537 | tstack.push(interior->GetFront());
|
---|
1538 | }
|
---|
1539 | }
|
---|
1540 |
|
---|
1541 | // delete the node and all its children
|
---|
1542 | DEL_PTR(sroot);
|
---|
1543 |
|
---|
1544 | // for(VspKdNode::SRayContainer::iterator ri = newleaf->mRays.begin();
|
---|
1545 | // ri != newleaf->mRays.end(); ++ ri)
|
---|
1546 | // (*ri).ray->UnMail(2);
|
---|
1547 |
|
---|
1548 | #if DEBUG_COLLAPSE
|
---|
1549 | cout << "Total memory before=" << GetMemUsage() << endl;
|
---|
1550 | #endif
|
---|
1551 |
|
---|
1552 | mStat.nodes -= collapsedNodes - 1;
|
---|
1553 | mStat.rayRefs -= totalRayCount - rayCount;
|
---|
1554 |
|
---|
1555 | #if DEBUG_COLLAPSE
|
---|
1556 | cout << "collapsed nodes" << collapsedNodes << endl;
|
---|
1557 | cout << "collapsed rays" << totalRayCount - rayCount << endl;
|
---|
1558 | cout << "Total memory after=" << GetMemUsage() << endl;
|
---|
1559 | cout << "================================" << endl;
|
---|
1560 | #endif
|
---|
1561 |
|
---|
1562 | // tstat.collapsedNodes += collapsedNodes;
|
---|
1563 | // tstat.collapsedRays += totalRayCount - rayCount;
|
---|
1564 | return totalRayCount - rayCount;
|
---|
1565 | }
|
---|
1566 |
|
---|
1567 |
|
---|
1568 | int VspKdTree::GetPvsSize(VspKdNode *node, const AxisAlignedBox3 &box) const
|
---|
1569 | {
|
---|
1570 | stack<VspKdNode *> tstack;
|
---|
1571 | tstack.push(mRoot);
|
---|
1572 |
|
---|
1573 | Intersectable::NewMail();
|
---|
1574 | int pvsSize = 0;
|
---|
1575 |
|
---|
1576 | while (!tstack.empty())
|
---|
1577 | {
|
---|
1578 | VspKdNode *node = tstack.top();
|
---|
1579 | tstack.pop();
|
---|
1580 |
|
---|
1581 | if (node->IsLeaf())
|
---|
1582 | {
|
---|
1583 | VspKdLeaf *leaf = (VspKdLeaf *)node;
|
---|
1584 | for (RayInfoContainer::iterator ri = leaf->mRays.begin();
|
---|
1585 | ri != leaf->mRays.end(); ++ ri)
|
---|
1586 | {
|
---|
1587 | if ((*ri).mRay->IsActive())
|
---|
1588 | {
|
---|
1589 | Intersectable *object;
|
---|
1590 | #if BIDIRECTIONAL_RAY
|
---|
1591 | object = (*ri).mRay->mOriginObject;
|
---|
1592 |
|
---|
1593 | if (object && !object->Mailed())
|
---|
1594 | {
|
---|
1595 | ++ pvsSize;
|
---|
1596 | object->Mail();
|
---|
1597 | }
|
---|
1598 | #endif
|
---|
1599 | object = (*ri).mRay->mTerminationObject;
|
---|
1600 | if (object && !object->Mailed())
|
---|
1601 | {
|
---|
1602 | ++ pvsSize;
|
---|
1603 | object->Mail();
|
---|
1604 | }
|
---|
1605 | }
|
---|
1606 | }
|
---|
1607 | }
|
---|
1608 | else
|
---|
1609 | {
|
---|
1610 | VspKdInterior *in = dynamic_cast<VspKdInterior *>(node);
|
---|
1611 |
|
---|
1612 | if (in->mAxis < 3)
|
---|
1613 | {
|
---|
1614 | if (box.Max(in->mAxis) >= in->mPosition)
|
---|
1615 | tstack.push(in->GetFront());
|
---|
1616 |
|
---|
1617 | if (box.Min(in->mAxis) <= in->mPosition)
|
---|
1618 | tstack.push(in->GetBack());
|
---|
1619 | }
|
---|
1620 | else
|
---|
1621 | {
|
---|
1622 | // both nodes for directional splits
|
---|
1623 | tstack.push(in->GetFront());
|
---|
1624 | tstack.push(in->GetBack());
|
---|
1625 | }
|
---|
1626 | }
|
---|
1627 | }
|
---|
1628 |
|
---|
1629 | return pvsSize;
|
---|
1630 | }
|
---|
1631 |
|
---|
1632 | void VspKdTree::GetRayContributionStatistics(float &minRayContribution,
|
---|
1633 | float &maxRayContribution,
|
---|
1634 | float &avgRayContribution)
|
---|
1635 | {
|
---|
1636 | stack<VspKdNode *> tstack;
|
---|
1637 | tstack.push(mRoot);
|
---|
1638 |
|
---|
1639 | minRayContribution = 1.0f;
|
---|
1640 | maxRayContribution = 0.0f;
|
---|
1641 |
|
---|
1642 | float sumRayContribution = 0.0f;
|
---|
1643 | int leaves = 0;
|
---|
1644 |
|
---|
1645 | while (!tstack.empty())
|
---|
1646 | {
|
---|
1647 | VspKdNode *node = tstack.top();
|
---|
1648 | tstack.pop();
|
---|
1649 | if (node->IsLeaf())
|
---|
1650 | {
|
---|
1651 | leaves++;
|
---|
1652 | VspKdLeaf *leaf = (VspKdLeaf *)node;
|
---|
1653 | float c = leaf->GetAvgRayContribution();
|
---|
1654 |
|
---|
1655 | if (c > maxRayContribution)
|
---|
1656 | maxRayContribution = c;
|
---|
1657 | if (c < minRayContribution)
|
---|
1658 | minRayContribution = c;
|
---|
1659 | sumRayContribution += c;
|
---|
1660 |
|
---|
1661 | }
|
---|
1662 | else {
|
---|
1663 | VspKdInterior *in = (VspKdInterior *)node;
|
---|
1664 | // both nodes for directional splits
|
---|
1665 | tstack.push(in->GetFront());
|
---|
1666 | tstack.push(in->GetBack());
|
---|
1667 | }
|
---|
1668 | }
|
---|
1669 |
|
---|
1670 | Debug << "sum=" << sumRayContribution << endl;
|
---|
1671 | Debug << "leaves=" << leaves << endl;
|
---|
1672 | avgRayContribution = sumRayContribution / (float)leaves;
|
---|
1673 | }
|
---|
1674 |
|
---|
1675 |
|
---|
1676 | int VspKdTree::GenerateRays(const float ratioPerLeaf,
|
---|
1677 | SimpleRayContainer &rays)
|
---|
1678 | {
|
---|
1679 | stack<VspKdNode *> tstack;
|
---|
1680 | tstack.push(mRoot);
|
---|
1681 |
|
---|
1682 | while (!tstack.empty())
|
---|
1683 | {
|
---|
1684 | VspKdNode *node = tstack.top();
|
---|
1685 | tstack.pop();
|
---|
1686 |
|
---|
1687 | if (node->IsLeaf())
|
---|
1688 | {
|
---|
1689 | VspKdLeaf *leaf = dynamic_cast<VspKdLeaf *>(node);
|
---|
1690 |
|
---|
1691 | float c = leaf->GetAvgRayContribution();
|
---|
1692 | int num = (int)(c*ratioPerLeaf + 0.5);
|
---|
1693 | // cout<<num<<" ";
|
---|
1694 |
|
---|
1695 | for (int i=0; i < num; i++)
|
---|
1696 | {
|
---|
1697 | Vector3 origin = GetBBox(leaf).GetRandomPoint();
|
---|
1698 | /*Vector3 dirVector = GetDirBBox(leaf).GetRandomPoint();
|
---|
1699 | Vector3 direction = Vector3(sin(dirVector.x), sin(dirVector.y), cos(dirVector.x));
|
---|
1700 | //cout<<"dir vector.x="<<dirVector.x<<"direction'.x="<<atan2(direction.x, direction.y)<<endl;
|
---|
1701 | rays.push_back(SimpleRay(origin, direction));*/
|
---|
1702 | }
|
---|
1703 |
|
---|
1704 | }
|
---|
1705 | else
|
---|
1706 | {
|
---|
1707 | VspKdInterior *in =
|
---|
1708 | dynamic_cast<VspKdInterior *>(node);
|
---|
1709 | // both nodes for directional splits
|
---|
1710 | tstack.push(in->GetFront());
|
---|
1711 | tstack.push(in->GetBack());
|
---|
1712 | }
|
---|
1713 | }
|
---|
1714 |
|
---|
1715 | return (int)rays.size();
|
---|
1716 | }
|
---|
1717 |
|
---|
1718 |
|
---|
1719 | float VspKdTree::GetAvgPvsSize()
|
---|
1720 | {
|
---|
1721 | stack<VspKdNode *> tstack;
|
---|
1722 | tstack.push(mRoot);
|
---|
1723 |
|
---|
1724 | int sumPvs = 0;
|
---|
1725 | int leaves = 0;
|
---|
1726 |
|
---|
1727 | while (!tstack.empty())
|
---|
1728 | {
|
---|
1729 | VspKdNode *node = tstack.top();
|
---|
1730 | tstack.pop();
|
---|
1731 |
|
---|
1732 | if (node->IsLeaf())
|
---|
1733 | {
|
---|
1734 | VspKdLeaf *leaf = (VspKdLeaf *)node;
|
---|
1735 | // update pvs size
|
---|
1736 | leaf->UpdatePvsSize();
|
---|
1737 | sumPvs += leaf->GetPvsSize();
|
---|
1738 | leaves++;
|
---|
1739 | }
|
---|
1740 | else
|
---|
1741 | {
|
---|
1742 | VspKdInterior *in = (VspKdInterior *)node;
|
---|
1743 | // both nodes for directional splits
|
---|
1744 | tstack.push(in->GetFront());
|
---|
1745 | tstack.push(in->GetBack());
|
---|
1746 | }
|
---|
1747 | }
|
---|
1748 |
|
---|
1749 | return sumPvs / (float)leaves;
|
---|
1750 | }
|
---|
1751 |
|
---|
1752 | VspKdNode *VspKdTree::GetRoot() const
|
---|
1753 | {
|
---|
1754 | return mRoot;
|
---|
1755 | }
|
---|
1756 |
|
---|
1757 | AxisAlignedBox3 VspKdTree::GetBBox(VspKdNode *node) const
|
---|
1758 | {
|
---|
1759 | if (node->mParent == NULL)
|
---|
1760 | return mBox;
|
---|
1761 |
|
---|
1762 | if (!node->IsLeaf())
|
---|
1763 | return (dynamic_cast<VspKdInterior *>(node))->mBox;
|
---|
1764 |
|
---|
1765 | if (node->mParent->mAxis >= 3)
|
---|
1766 | return node->mParent->mBox;
|
---|
1767 |
|
---|
1768 | AxisAlignedBox3 box(node->mParent->mBox);
|
---|
1769 | if (node->mParent->GetFront() == node)
|
---|
1770 | box.SetMin(node->mParent->mAxis, node->mParent->mPosition);
|
---|
1771 | else
|
---|
1772 | box.SetMax(node->mParent->mAxis, node->mParent->mPosition);
|
---|
1773 |
|
---|
1774 | return box;
|
---|
1775 | }
|
---|
1776 |
|
---|
1777 | int VspKdTree::GetRootPvsSize() const
|
---|
1778 | {
|
---|
1779 | return GetPvsSize(mRoot, mBox);
|
---|
1780 | }
|
---|
1781 |
|
---|
1782 | const VspKdStatistics &VspKdTree::GetStatistics() const
|
---|
1783 | {
|
---|
1784 | return mStat;
|
---|
1785 | }
|
---|
1786 |
|
---|
1787 | void VspKdTree::AddRays(VssRayContainer &add)
|
---|
1788 | {
|
---|
1789 | VssRayContainer remove;
|
---|
1790 | UpdateRays(remove, add);
|
---|
1791 | }
|
---|
1792 |
|
---|
1793 | // return memory usage in MB
|
---|
1794 | float VspKdTree::GetMemUsage() const
|
---|
1795 | {
|
---|
1796 | return
|
---|
1797 | (sizeof(VspKdTree) +
|
---|
1798 | mStat.Leaves() * sizeof(VspKdLeaf) +
|
---|
1799 | mStat.Interior() * sizeof(VspKdInterior) +
|
---|
1800 | mStat.rayRefs * sizeof(RayInfo)) / (1024.0f * 1024.0f);
|
---|
1801 | }
|
---|
1802 |
|
---|
1803 | float VspKdTree::GetRayMemUsage() const
|
---|
1804 | {
|
---|
1805 | return mStat.rays * (sizeof(VssRay))/(1024.0f * 1024.0f);
|
---|
1806 | }
|
---|
1807 |
|
---|
1808 | int VspKdTree::ComputePvsSize(VspKdNode *node,
|
---|
1809 | const RayInfoContainer &globalRays) const
|
---|
1810 | {
|
---|
1811 | int pvsSize = 0;
|
---|
1812 |
|
---|
1813 | const AxisAlignedBox3 box = GetBBox(node);
|
---|
1814 |
|
---|
1815 | RayInfoContainer::const_iterator it, it_end = globalRays.end();
|
---|
1816 |
|
---|
1817 | // warning: implicit conversion from VssRay to Ray
|
---|
1818 | for (it = globalRays.begin(); it != globalRays.end(); ++ it)
|
---|
1819 | pvsSize += box.GetMinMaxT(*(*it).mRay, NULL, NULL);
|
---|
1820 |
|
---|
1821 | return pvsSize;
|
---|
1822 | }
|
---|
1823 |
|
---|
1824 | void VspKdTree::CollectLeaves(vector<VspKdLeaf *> &leaves) const
|
---|
1825 | {
|
---|
1826 | stack<VspKdNode *> nodeStack;
|
---|
1827 | nodeStack.push(mRoot);
|
---|
1828 |
|
---|
1829 | while (!nodeStack.empty())
|
---|
1830 | {
|
---|
1831 | VspKdNode *node = nodeStack.top();
|
---|
1832 |
|
---|
1833 | nodeStack.pop();
|
---|
1834 |
|
---|
1835 | if (node->IsLeaf())
|
---|
1836 | {
|
---|
1837 | VspKdLeaf *leaf = dynamic_cast<VspKdLeaf *>(node);
|
---|
1838 | leaves.push_back(leaf);
|
---|
1839 | }
|
---|
1840 | else
|
---|
1841 | {
|
---|
1842 | VspKdInterior *interior = dynamic_cast<VspKdInterior *>(node);
|
---|
1843 |
|
---|
1844 | nodeStack.push(interior->GetBack());
|
---|
1845 | nodeStack.push(interior->GetFront());
|
---|
1846 | }
|
---|
1847 | }
|
---|
1848 | }
|
---|
1849 |
|
---|
1850 | int VspKdTree::FindNeighbors(VspKdLeaf *n,
|
---|
1851 | vector<VspKdLeaf *> &neighbors,
|
---|
1852 | bool onlyUnmailed)
|
---|
1853 | {
|
---|
1854 | stack<VspKdNode *> nodeStack;
|
---|
1855 |
|
---|
1856 | nodeStack.push(mRoot);
|
---|
1857 |
|
---|
1858 | AxisAlignedBox3 box = GetBBox(n);
|
---|
1859 |
|
---|
1860 | while (!nodeStack.empty())
|
---|
1861 | {
|
---|
1862 | VspKdNode *node = nodeStack.top();
|
---|
1863 | nodeStack.pop();
|
---|
1864 |
|
---|
1865 | if (node->IsLeaf())
|
---|
1866 | {
|
---|
1867 | VspKdLeaf *leaf = dynamic_cast<VspKdLeaf *>(node);
|
---|
1868 |
|
---|
1869 | if (leaf != n && (!onlyUnmailed || !leaf->Mailed()))
|
---|
1870 | neighbors.push_back(leaf);
|
---|
1871 | }
|
---|
1872 | else
|
---|
1873 | {
|
---|
1874 | VspKdInterior *interior = dynamic_cast<VspKdInterior *>(node);
|
---|
1875 |
|
---|
1876 | if (interior->mPosition > box.Max(interior->mAxis))
|
---|
1877 | nodeStack.push(interior->mBack);
|
---|
1878 | else
|
---|
1879 | {
|
---|
1880 | if (interior->mPosition < box.Min(interior->mAxis))
|
---|
1881 | nodeStack.push(interior->mFront);
|
---|
1882 | else
|
---|
1883 | {
|
---|
1884 | // random decision
|
---|
1885 | nodeStack.push(interior->mBack);
|
---|
1886 | nodeStack.push(interior->mFront);
|
---|
1887 | }
|
---|
1888 | }
|
---|
1889 | }
|
---|
1890 | }
|
---|
1891 |
|
---|
1892 | return (int)neighbors.size();
|
---|
1893 | }
|
---|
1894 |
|
---|
1895 |
|
---|
1896 |
|
---|
1897 | void VspKdTree::SetViewCellsManager(ViewCellsManager *vcm)
|
---|
1898 | {
|
---|
1899 | mViewCellsManager = vcm;
|
---|
1900 | }
|
---|
1901 |
|
---|
1902 |
|
---|
1903 | int VspKdTree::CastLineSegment(const Vector3 &origin,
|
---|
1904 | const Vector3 &termination,
|
---|
1905 | vector<ViewCell *> &viewcells)
|
---|
1906 | {
|
---|
1907 | int hits = 0;
|
---|
1908 |
|
---|
1909 | float mint = 0.0f, maxt = 1.0f;
|
---|
1910 | const Vector3 dir = termination - origin;
|
---|
1911 |
|
---|
1912 | stack<LineSegmentTraversalData > tStack;
|
---|
1913 |
|
---|
1914 | Intersectable::NewMail();
|
---|
1915 |
|
---|
1916 | //if (!mBox.GetMinMaxT(ray, &mint, &maxt)) return 0;
|
---|
1917 |
|
---|
1918 | if (mint < 0)
|
---|
1919 | mint = 0;
|
---|
1920 |
|
---|
1921 | maxt += Limits::Threshold;
|
---|
1922 |
|
---|
1923 | Vector3 entp = origin;
|
---|
1924 | Vector3 extp = termination;
|
---|
1925 |
|
---|
1926 | VspKdNode *node = mRoot;
|
---|
1927 | VspKdNode *farChild;
|
---|
1928 |
|
---|
1929 | float position;
|
---|
1930 | int axis;
|
---|
1931 |
|
---|
1932 | while (1)
|
---|
1933 | {
|
---|
1934 | if (!node->IsLeaf())
|
---|
1935 | {
|
---|
1936 | VspKdInterior *in = dynamic_cast<VspKdInterior *>(node);
|
---|
1937 | position = in->mPosition;
|
---|
1938 | axis = in->mAxis;
|
---|
1939 |
|
---|
1940 | if (entp[axis] <= position)
|
---|
1941 | {
|
---|
1942 | if (extp[axis] <= position)
|
---|
1943 | {
|
---|
1944 | node = in->mBack;
|
---|
1945 | // cases N1,N2,N3,P5,Z2,Z3
|
---|
1946 | continue;
|
---|
1947 | } else
|
---|
1948 | {
|
---|
1949 | // case N4
|
---|
1950 | node = in->mBack;
|
---|
1951 | farChild = in->mFront;
|
---|
1952 | }
|
---|
1953 | }
|
---|
1954 | else
|
---|
1955 | {
|
---|
1956 | if (position <= extp[axis])
|
---|
1957 | {
|
---|
1958 | node = in->mFront;
|
---|
1959 | // cases P1,P2,P3,N5,Z1
|
---|
1960 | continue;
|
---|
1961 | }
|
---|
1962 | else
|
---|
1963 | {
|
---|
1964 | node = in->mFront;
|
---|
1965 | farChild = in->mBack;
|
---|
1966 | // case P4
|
---|
1967 | }
|
---|
1968 | }
|
---|
1969 |
|
---|
1970 | // $$ modification 3.5.2004 - hints from Kamil Ghais
|
---|
1971 | // case N4 or P4
|
---|
1972 | float tdist = (position - origin[axis]) / dir[axis];
|
---|
1973 | //tStack.push(RayTraversalData(farChild, extp, maxt)); //TODO
|
---|
1974 | extp = origin + dir * tdist;
|
---|
1975 | maxt = tdist;
|
---|
1976 | }
|
---|
1977 | else
|
---|
1978 | {
|
---|
1979 | // compute intersection with all objects in this leaf
|
---|
1980 | VspKdLeaf *leaf = dynamic_cast<VspKdLeaf *>(node);
|
---|
1981 | ViewCell *vc = leaf->GetViewCell();
|
---|
1982 |
|
---|
1983 | if (!vc->Mailed())
|
---|
1984 | {
|
---|
1985 | vc->Mail();
|
---|
1986 | viewcells.push_back(vc);
|
---|
1987 | }
|
---|
1988 |
|
---|
1989 | // get the next node from the stack
|
---|
1990 | if (tStack.empty())
|
---|
1991 | break;
|
---|
1992 |
|
---|
1993 | entp = extp;
|
---|
1994 | mint = maxt;
|
---|
1995 |
|
---|
1996 | LineSegmentTraversalData &s = tStack.top();
|
---|
1997 | node = s.mNode;
|
---|
1998 | extp = s.mExitPoint;
|
---|
1999 | maxt = s.mMaxT;
|
---|
2000 | tStack.pop();
|
---|
2001 | }
|
---|
2002 | }
|
---|
2003 |
|
---|
2004 | return hits;
|
---|
2005 | }
|
---|
2006 |
|
---|
2007 |
|
---|
2008 | void VspKdTree::GenerateViewCell(VspKdLeaf *leaf)
|
---|
2009 | {
|
---|
2010 | RayInfoContainer::const_iterator it, it_end = leaf->GetRays().end();
|
---|
2011 |
|
---|
2012 | VspKdViewCell *vc = dynamic_cast<VspKdViewCell *>(mViewCellsManager->GenerateViewCell());
|
---|
2013 | leaf->SetViewCell(vc);
|
---|
2014 |
|
---|
2015 | vc->SetSize(GetBBox(leaf).GetVolume());
|
---|
2016 | vc->mVspKdLeaves.push_back(leaf);
|
---|
2017 |
|
---|
2018 | for (it = leaf->GetRays().begin(); it != it_end; ++ it)
|
---|
2019 | {
|
---|
2020 | VssRay *ray = (*it).mRay;
|
---|
2021 |
|
---|
2022 | if (ray->mTerminationObject)
|
---|
2023 | vc->GetPvs().AddSample(ray->mTerminationObject);
|
---|
2024 |
|
---|
2025 | if (ray->mOriginObject)
|
---|
2026 | vc->GetPvs().AddSample(ray->mOriginObject);
|
---|
2027 | }
|
---|
2028 | }
|
---|
2029 |
|
---|
2030 |
|
---|
2031 | void VspKdTree::EvaluateViewCellsStats(ViewCellsStatistics &vcStat) const
|
---|
2032 | {
|
---|
2033 | vcStat.Reset();
|
---|
2034 |
|
---|
2035 | stack<VspKdNode *> nodeStack;
|
---|
2036 | nodeStack.push(mRoot);
|
---|
2037 |
|
---|
2038 | ViewCell::NewMail();
|
---|
2039 |
|
---|
2040 | while (!nodeStack.empty())
|
---|
2041 | {
|
---|
2042 | VspKdNode *node = nodeStack.top();
|
---|
2043 | nodeStack.pop();
|
---|
2044 |
|
---|
2045 | if (node->IsLeaf())
|
---|
2046 | {
|
---|
2047 | ++ vcStat.leaves;
|
---|
2048 |
|
---|
2049 | VspKdViewCell *viewCell = dynamic_cast<VspKdLeaf *>(node)->mViewCell;
|
---|
2050 |
|
---|
2051 | if (!viewCell->Mailed())
|
---|
2052 | {
|
---|
2053 | viewCell->Mail();
|
---|
2054 |
|
---|
2055 | ++ vcStat.viewCells;
|
---|
2056 | const int pvsSize = viewCell->GetPvs().GetSize();
|
---|
2057 |
|
---|
2058 | vcStat.pvs += pvsSize;
|
---|
2059 |
|
---|
2060 | if (pvsSize < 1)
|
---|
2061 | ++ vcStat.emptyPvs;
|
---|
2062 |
|
---|
2063 | if (pvsSize > vcStat.maxPvs)
|
---|
2064 | vcStat.maxPvs = pvsSize;
|
---|
2065 |
|
---|
2066 | if (pvsSize < vcStat.minPvs)
|
---|
2067 | vcStat.minPvs = pvsSize;
|
---|
2068 |
|
---|
2069 | if ((int)viewCell->mVspKdLeaves.size() > vcStat.maxLeaves)
|
---|
2070 | vcStat.maxLeaves = (int)viewCell->mVspKdLeaves.size();
|
---|
2071 | }
|
---|
2072 | }
|
---|
2073 | else
|
---|
2074 | {
|
---|
2075 | VspKdInterior *interior = dynamic_cast<VspKdInterior *>(node);
|
---|
2076 |
|
---|
2077 | nodeStack.push(interior->GetFront());
|
---|
2078 | nodeStack.push(interior->GetBack());
|
---|
2079 | }
|
---|
2080 | }
|
---|
2081 | }
|
---|
2082 |
|
---|
2083 |
|
---|
2084 |
|
---|
2085 | bool VspKdTree::MergeViewCells(VspKdLeaf *l1, VspKdLeaf *l2) |
---|
2086 | { |
---|
2087 | //-- change pointer to view cells of all leaves associated with the previous view cells |
---|
2088 | VspKdViewCell *fVc = l1->GetViewCell(); |
---|
2089 | VspKdViewCell *bVc = l2->GetViewCell(); |
---|
2090 | |
---|
2091 | VspKdViewCell *vc = dynamic_cast<VspKdViewCell *>( |
---|
2092 | mViewCellsManager->MergeViewCells(*fVc, *bVc)); |
---|
2093 | |
---|
2094 | // if merge was unsuccessful |
---|
2095 | if (!vc) return false; |
---|
2096 | |
---|
2097 | // set new size of view cell |
---|
2098 | vc->SetSize(fVc->GetSize() + bVc->GetSize()); |
---|
2099 | |
---|
2100 | vector<VspKdLeaf *> fLeaves = fVc->mVspKdLeaves; |
---|
2101 | vector<VspKdLeaf *> bLeaves = bVc->mVspKdLeaves; |
---|
2102 | |
---|
2103 | vector<VspKdLeaf *>::const_iterator it; |
---|
2104 | |
---|
2105 | //-- change view cells of all the other leaves the view cell belongs to |
---|
2106 | for (it = fLeaves.begin(); it != fLeaves.end(); ++ it) |
---|
2107 | { |
---|
2108 | (*it)->SetViewCell(vc); |
---|
2109 | vc->mVspKdLeaves.push_back(*it); |
---|
2110 | } |
---|
2111 | |
---|
2112 | for (it = bLeaves.begin(); it != bLeaves.end(); ++ it) |
---|
2113 | { |
---|
2114 | (*it)->SetViewCell(vc); |
---|
2115 | vc->mVspKdLeaves.push_back(*it); |
---|
2116 | } |
---|
2117 | |
---|
2118 | vc->Mail();
|
---|
2119 | |
---|
2120 | // clean up old view cells |
---|
2121 | DEL_PTR(fVc); |
---|
2122 | DEL_PTR(bVc); |
---|
2123 | |
---|
2124 | return true;
|
---|
2125 | }
|
---|
2126 |
|
---|
2127 |
|
---|
2128 |
|
---|
2129 | int VspKdTree::MergeLeaves()
|
---|
2130 | {
|
---|
2131 | vector<VspKdLeaf *> leaves;
|
---|
2132 | priority_queue<MergeCandidate> mergeQueue;
|
---|
2133 |
|
---|
2134 | // collect the leaves, e.g., the "voxels" that will build the view cells
|
---|
2135 | CollectLeaves(leaves);
|
---|
2136 |
|
---|
2137 | int vcSize = (int)leaves.size();
|
---|
2138 |
|
---|
2139 | VspKdLeaf::NewMail();
|
---|
2140 |
|
---|
2141 | vector<VspKdLeaf *>::const_iterator it, it_end = leaves.end();
|
---|
2142 |
|
---|
2143 | // generate view cells
|
---|
2144 | for (it = leaves.begin(); it != it_end; ++ it)
|
---|
2145 | GenerateViewCell(*it);
|
---|
2146 |
|
---|
2147 | // find merge candidates and push them into queue
|
---|
2148 | for (it = leaves.begin(); it != it_end; ++ it)
|
---|
2149 | {
|
---|
2150 | VspKdLeaf *leaf = *it;
|
---|
2151 |
|
---|
2152 | // no leaf is part of two merge candidates
|
---|
2153 | if (!leaf->Mailed())
|
---|
2154 | {
|
---|
2155 | leaf->Mail();
|
---|
2156 |
|
---|
2157 | vector<VspKdLeaf *> neighbors;
|
---|
2158 | FindNeighbors(leaf, neighbors, true);
|
---|
2159 |
|
---|
2160 | vector<VspKdLeaf *>::const_iterator nit,
|
---|
2161 | nit_end = neighbors.end();
|
---|
2162 |
|
---|
2163 | for (nit = neighbors.begin(); nit != nit_end; ++ nit)
|
---|
2164 | mergeQueue.push(MergeCandidate(leaf, *nit));
|
---|
2165 | }
|
---|
2166 | }
|
---|
2167 |
|
---|
2168 | int merged = 0;
|
---|
2169 |
|
---|
2170 | //Debug << mMinViewCells << " " << mMaxCostRatio << endl;
|
---|
2171 |
|
---|
2172 | // use priority queue to merge leaves
|
---|
2173 | while (!mergeQueue.empty() &&
|
---|
2174 | (vcSize > mMinViewCells))// &&
|
---|
2175 | //(mergeQueue.top().GetMergeCost() < mMaxCostRatio))
|
---|
2176 | {
|
---|
2177 | //Debug << mergeQueue.top().GetMergeCost() << " " << mMaxCostRatio << endl;
|
---|
2178 | MergeCandidate mc = mergeQueue.top();
|
---|
2179 | mergeQueue.pop();
|
---|
2180 |
|
---|
2181 | // both view cells equal!
|
---|
2182 | if (mc.GetLeaf1()->GetViewCell() == mc.GetLeaf2()->GetViewCell())
|
---|
2183 | continue;
|
---|
2184 |
|
---|
2185 | if (mc.Valid())
|
---|
2186 | {
|
---|
2187 | ViewCell::NewMail();
|
---|
2188 | MergeViewCells(mc.GetLeaf1(), mc.GetLeaf2());
|
---|
2189 |
|
---|
2190 | ++ merged;
|
---|
2191 | -- vcSize;
|
---|
2192 | }
|
---|
2193 | // merge candidate not valid, because one of the leaves was already
|
---|
2194 | // merged with another one
|
---|
2195 | else
|
---|
2196 | {
|
---|
2197 | // validate and reinsert into queue
|
---|
2198 | mc.SetValid();
|
---|
2199 | mergeQueue.push(mc);
|
---|
2200 | //Debug << "validate " << mc.GetMergeCost() << endl;
|
---|
2201 | }
|
---|
2202 | }
|
---|
2203 |
|
---|
2204 | // collapse tree according to view cell partition
|
---|
2205 | CollapseTree(mRoot);
|
---|
2206 |
|
---|
2207 | // revalidate leaves
|
---|
2208 | ValidateViewCellLeaves();
|
---|
2209 |
|
---|
2210 |
|
---|
2211 | return merged;
|
---|
2212 | }
|
---|
2213 |
|
---|
2214 |
|
---|
2215 | void VspKdTree::ValidateViewCellLeaves()
|
---|
2216 | { |
---|
2217 | // list not valid anymore => clear
|
---|
2218 | stack<VspKdNode *> nodeStack; |
---|
2219 | nodeStack.push(mRoot); |
---|
2220 | |
---|
2221 | ViewCell::NewMail(); |
---|
2222 | |
---|
2223 | while (!nodeStack.empty()) |
---|
2224 | { |
---|
2225 | VspKdNode *node = nodeStack.top(); |
---|
2226 | nodeStack.pop(); |
---|
2227 | |
---|
2228 | if (node->IsLeaf()) |
---|
2229 | { |
---|
2230 | VspKdLeaf *leaf = dynamic_cast<VspKdLeaf *>(node); |
---|
2231 | |
---|
2232 | VspKdViewCell *viewCell = leaf->GetViewCell(); |
---|
2233 | |
---|
2234 | if (!viewCell->Mailed()) |
---|
2235 | { |
---|
2236 | Debug << "jhere2" << endl; |
---|
2237 | viewCell->mVspKdLeaves.clear(); |
---|
2238 | viewCell->Mail(); |
---|
2239 | } |
---|
2240 | |
---|
2241 | viewCell->mVspKdLeaves.push_back(leaf); |
---|
2242 | } |
---|
2243 | else |
---|
2244 | { |
---|
2245 | VspKdInterior *interior = dynamic_cast<VspKdInterior *>(node); |
---|
2246 | |
---|
2247 | nodeStack.push(interior->GetFront()); |
---|
2248 | nodeStack.push(interior->GetBack()); |
---|
2249 | } |
---|
2250 | }
|
---|
2251 | }
|
---|
2252 |
|
---|
2253 | VspKdNode *VspKdTree::CollapseTree(VspKdNode *node)
|
---|
2254 | {
|
---|
2255 | if (node->IsLeaf())
|
---|
2256 | return node;
|
---|
2257 |
|
---|
2258 | Debug << "here554444" << endl;
|
---|
2259 | VspKdInterior *interior = dynamic_cast<VspKdInterior *>(node); |
---|
2260 | |
---|
2261 | VspKdNode *front = CollapseTree(interior->GetFront()); |
---|
2262 | VspKdNode *back = CollapseTree(interior->GetBack()); |
---|
2263 | |
---|
2264 | if (front->IsLeaf() && back->IsLeaf())
|
---|
2265 | {
|
---|
2266 | VspKdLeaf *frontLeaf = dynamic_cast<VspKdLeaf *>(front);
|
---|
2267 | VspKdLeaf *backLeaf = dynamic_cast<VspKdLeaf *>(back);
|
---|
2268 |
|
---|
2269 | //-- collapse tree
|
---|
2270 | if (frontLeaf->GetViewCell() == backLeaf->GetViewCell())
|
---|
2271 | {
|
---|
2272 | VspKdViewCell *vc = frontLeaf->GetViewCell();
|
---|
2273 |
|
---|
2274 | VspKdLeaf *leaf = new VspKdLeaf(interior->GetParent(), 0);
|
---|
2275 | leaf->SetViewCell(vc);
|
---|
2276 |
|
---|
2277 | // replace a link from node's parent
|
---|
2278 | if (leaf->mParent)
|
---|
2279 | leaf->mParent->ReplaceChildLink(node, leaf);
|
---|
2280 |
|
---|
2281 | delete interior;
|
---|
2282 |
|
---|
2283 | return leaf;
|
---|
2284 | }
|
---|
2285 | }
|
---|
2286 |
|
---|
2287 | return node;
|
---|
2288 | }
|
---|
2289 |
|
---|
2290 |
|
---|
2291 | /*********************************************************************/
|
---|
2292 | /* MergeCandidate implementation */
|
---|
2293 | /*********************************************************************/
|
---|
2294 |
|
---|
2295 |
|
---|
2296 | MergeCandidate::MergeCandidate(VspKdLeaf *l1, VspKdLeaf *l2):
|
---|
2297 | mMergeCost(0),
|
---|
2298 | mLeaf1(l1),
|
---|
2299 | mLeaf2(l2),
|
---|
2300 | mLeaf1Id(l1->GetViewCell()->mMailbox),
|
---|
2301 | mLeaf2Id(l2->GetViewCell()->mMailbox)
|
---|
2302 | {
|
---|
2303 | EvalMergeCost();
|
---|
2304 | }
|
---|
2305 |
|
---|
2306 |
|
---|
2307 | void MergeCandidate::EvalMergeCost()
|
---|
2308 | {
|
---|
2309 | //-- compute pvs difference
|
---|
2310 | VspKdViewCell *vc1 = mLeaf1->GetViewCell();
|
---|
2311 | VspKdViewCell *vc2 = mLeaf2->GetViewCell();
|
---|
2312 |
|
---|
2313 | const int diff1 = vc1->GetPvs().Diff(vc2->GetPvs());
|
---|
2314 | const int vcPvs = diff1 + vc1->GetPvs().GetSize();
|
---|
2315 |
|
---|
2316 | //-- compute ratio of old cost
|
---|
2317 | //-- (added size of left and right view cell times pvs size)
|
---|
2318 | //-- to new rendering cost (size of merged view cell times pvs size)
|
---|
2319 | const float oldCost =
|
---|
2320 | (float)vc1->GetPvs().GetSize() * vc1->GetSize() +
|
---|
2321 | (float)vc2->GetPvs().GetSize() * vc2->GetSize();
|
---|
2322 |
|
---|
2323 | const float newCost =
|
---|
2324 | (float)vcPvs * (vc1->GetSize() + vc2->GetSize());
|
---|
2325 |
|
---|
2326 | mMergeCost = newCost - oldCost;
|
---|
2327 |
|
---|
2328 | // if (vcPvs > sMaxPvsSize) // strong penalty if pvs size too large
|
---|
2329 | // mMergeCost += 1.0;
|
---|
2330 | }
|
---|
2331 |
|
---|
2332 | void MergeCandidate::SetLeaf1(VspKdLeaf *l)
|
---|
2333 | {
|
---|
2334 | mLeaf1 = l;
|
---|
2335 | }
|
---|
2336 |
|
---|
2337 | void MergeCandidate::SetLeaf2(VspKdLeaf *l)
|
---|
2338 | {
|
---|
2339 | mLeaf2 = l;
|
---|
2340 | }
|
---|
2341 |
|
---|
2342 | VspKdLeaf *MergeCandidate::GetLeaf1()
|
---|
2343 | {
|
---|
2344 | return mLeaf1;
|
---|
2345 | }
|
---|
2346 |
|
---|
2347 | VspKdLeaf *MergeCandidate::GetLeaf2()
|
---|
2348 | {
|
---|
2349 | return mLeaf2;
|
---|
2350 | }
|
---|
2351 |
|
---|
2352 | bool MergeCandidate::Valid() const
|
---|
2353 | {
|
---|
2354 | return
|
---|
2355 | (mLeaf1->GetViewCell()->mMailbox == mLeaf1Id) &&
|
---|
2356 | (mLeaf2->GetViewCell()->mMailbox == mLeaf2Id);
|
---|
2357 | }
|
---|
2358 |
|
---|
2359 | float MergeCandidate::GetMergeCost() const
|
---|
2360 | {
|
---|
2361 | return mMergeCost;
|
---|
2362 | }
|
---|
2363 |
|
---|
2364 | void MergeCandidate::SetValid()
|
---|
2365 | {
|
---|
2366 | mLeaf1Id = mLeaf1->GetViewCell()->mMailbox;
|
---|
2367 | mLeaf2Id = mLeaf2->GetViewCell()->mMailbox;
|
---|
2368 |
|
---|
2369 | EvalMergeCost();
|
---|
2370 | }
|
---|