1 | #include <stack>
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2 | #include <time.h>
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3 | #include <iomanip>
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4 |
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5 | #include "BvHierarchy.h"
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6 | #include "ViewCell.h"
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7 | #include "Plane3.h"
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8 | #include "Mesh.h"
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9 | #include "common.h"
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10 | #include "Environment.h"
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11 | #include "Polygon3.h"
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12 | #include "Ray.h"
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13 | #include "AxisAlignedBox3.h"
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14 | #include "Exporter.h"
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15 | #include "Plane3.h"
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16 | #include "ViewCellsManager.h"
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17 | #include "Beam.h"
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18 | #include "VspTree.h"
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19 | #include "HierarchyManager.h"
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20 |
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21 |
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22 | namespace GtpVisibilityPreprocessor {
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23 |
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24 |
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25 | #define PROBABILIY_IS_BV_VOLUME 1
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26 | #define USE_FIXEDPOINT_T 0
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27 | #define USE_VOLUMES_FOR_HEURISTICS 1
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28 |
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29 | int BvhNode::sMailId = 10000; //2147483647;
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30 | int BvhNode::sReservedMailboxes = 1;
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31 |
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32 | BvHierarchy *BvHierarchy::BvhSubdivisionCandidate::sBvHierarchy = NULL;
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33 |
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34 |
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35 | /// sorting operator
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36 | inline static bool ilt(Intersectable *obj1, Intersectable *obj2)
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37 | {
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38 | return obj1->mId < obj2->mId;
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39 | }
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40 |
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41 |
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42 | /***************************************************************/
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43 | /* class BvhNode implementation */
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44 | /***************************************************************/
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45 |
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46 | BvhNode::BvhNode():
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47 | mParent(NULL),
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48 | mMailbox(0),
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49 | //mRenderCostDecr(0),
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50 | //mMemoryIncr(0),
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51 | //mPvsEntriesIncr(0),
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52 | mTimeStamp(0)
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53 | {
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54 |
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55 | }
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56 |
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57 | BvhNode::BvhNode(const AxisAlignedBox3 &bbox):
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58 | mParent(NULL),
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59 | mBoundingBox(bbox),
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60 | mMailbox(0),
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61 | //mMemoryIncr(0),
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62 | //mRenderCostDecr(0),
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63 | //mPvsEntriesIncr(0),
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64 | mTimeStamp(0)
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65 | {
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66 | }
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67 |
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68 |
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69 | BvhNode::BvhNode(const AxisAlignedBox3 &bbox, BvhInterior *parent):
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70 | mBoundingBox(bbox),
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71 | mParent(parent),
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72 | mMailbox(0),
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73 | //mMemoryIncr(0),
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74 | //mRenderCostDecr(0),
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75 | //mPvsEntriesIncr(0),
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76 | mTimeStamp(0)
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77 | {
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78 | }
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79 |
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80 |
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81 | bool BvhNode::IsRoot() const
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82 | {
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83 | return mParent == NULL;
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84 | }
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85 |
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86 |
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87 | BvhInterior *BvhNode::GetParent()
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88 | {
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89 | return mParent;
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90 | }
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91 |
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92 |
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93 | void BvhNode::SetParent(BvhInterior *parent)
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94 | {
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95 | mParent = parent;
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96 | }
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97 |
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98 |
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99 |
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100 | /******************************************************************/
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101 | /* class BvhInterior implementation */
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102 | /******************************************************************/
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103 |
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104 |
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105 | BvhLeaf::BvhLeaf(const AxisAlignedBox3 &bbox):
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106 | BvhNode(bbox),
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107 | mSubdivisionCandidate(NULL)
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108 | {
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109 | mActiveNode = this;
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110 | }
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111 |
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112 |
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113 | BvhLeaf::BvhLeaf(const AxisAlignedBox3 &bbox, BvhInterior *parent):
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114 | BvhNode(bbox, parent)
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115 | {
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116 | mActiveNode = this;
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117 | }
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118 |
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119 |
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120 | BvhLeaf::BvhLeaf(const AxisAlignedBox3 &bbox,
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121 | BvhInterior *parent,
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122 | const int numObjects):
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123 | BvhNode(bbox, parent)
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124 | {
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125 | mObjects.reserve(numObjects);
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126 | mActiveNode = this;
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127 | }
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128 |
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129 |
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130 | bool BvhLeaf::IsLeaf() const
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131 | {
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132 | return true;
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133 | }
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134 |
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135 |
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136 | BvhLeaf::~BvhLeaf()
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137 | {
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138 | }
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139 |
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140 |
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141 | void BvhLeaf::CollectObjects(ObjectContainer &objects)
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142 | {
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143 | ObjectContainer::const_iterator oit, oit_end = mObjects.end();
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144 | for (oit = mObjects.begin(); oit != oit_end; ++ oit)
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145 | {
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146 | objects.push_back(*oit);
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147 | }
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148 | }
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149 |
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150 | /******************************************************************/
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151 | /* class BvhInterior implementation */
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152 | /******************************************************************/
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153 |
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154 |
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155 | BvhInterior::BvhInterior(const AxisAlignedBox3 &bbox):
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156 | BvhNode(bbox), mFront(NULL), mBack(NULL)
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157 | {
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158 | }
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159 |
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160 |
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161 | BvhInterior::BvhInterior(const AxisAlignedBox3 &bbox, BvhInterior *parent):
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162 | BvhNode(bbox, parent), mFront(NULL), mBack(NULL)
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163 | {
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164 | }
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165 |
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166 |
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167 | void BvhInterior::ReplaceChildLink(BvhNode *oldChild, BvhNode *newChild)
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168 | {
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169 | if (mBack == oldChild)
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170 | mBack = newChild;
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171 | else
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172 | mFront = newChild;
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173 | }
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174 |
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175 |
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176 | bool BvhInterior::IsLeaf() const
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177 | {
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178 | return false;
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179 | }
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180 |
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181 |
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182 | BvhInterior::~BvhInterior()
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183 | {
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184 | DEL_PTR(mFront);
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185 | DEL_PTR(mBack);
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186 | }
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187 |
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188 |
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189 | void BvhInterior::SetupChildLinks(BvhNode *front, BvhNode *back)
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190 | {
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191 | mBack = back;
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192 | mFront = front;
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193 | }
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194 |
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195 |
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196 | void BvhInterior::CollectObjects(ObjectContainer &objects)
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197 | {
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198 | mFront->CollectObjects(objects);
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199 | mBack->CollectObjects(objects);
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200 | }
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201 |
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202 |
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203 | /*******************************************************************/
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204 | /* class BvHierarchy implementation */
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205 | /*******************************************************************/
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206 |
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207 |
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208 | BvHierarchy::BvHierarchy():
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209 | mRoot(NULL),
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210 | mTimeStamp(1)
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211 | {
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212 | ReadEnvironment();
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213 | mSubdivisionCandidates = new SortableEntryContainer;
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214 | for (int i = 0; i < 3; ++ i)
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215 | mSortedObjects[i] = NULL;
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216 | }
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217 |
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218 |
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219 | BvHierarchy::~BvHierarchy()
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220 | {
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221 | // delete bvh intersectables
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222 | BvhIntersectableMap::iterator it, it_end = mBvhIntersectables.end();
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223 |
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224 | for (it = mBvhIntersectables.begin(); it != mBvhIntersectables.end(); ++ it)
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225 | {
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226 | DEL_PTR((*it).second);
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227 | }
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228 |
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229 | // delete the local subdivision candidates
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230 | DEL_PTR(mSubdivisionCandidates);
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231 |
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232 | // delete the presorted objects
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233 | for (int i = 0; i < 3; ++ i)
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234 | {
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235 | DEL_PTR(mSortedObjects[i]);
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236 | }
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237 |
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238 | // delete the tree
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239 | DEL_PTR(mRoot);
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240 | }
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241 |
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242 |
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243 | void BvHierarchy::ReadEnvironment()
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244 | {
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245 | bool randomize = false;
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246 | Environment::GetSingleton()->GetBoolValue("VspTree.Construction.randomize", randomize);
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247 |
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248 | // initialise random generator for heuristics
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249 | if (randomize)
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250 | Randomize();
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251 |
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252 | //////////////////////////////
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253 | //-- termination criteria for autopartition
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254 |
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255 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.maxDepth", mTermMaxDepth);
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256 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.maxLeaves", mTermMaxLeaves);
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257 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.minObjects", mTermMinObjects);
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258 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.minRays", mTermMinRays);
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259 | Environment::GetSingleton()->GetFloatValue(
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260 | "BvHierarchy.Termination.minProbability", mTermMinProbability);
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261 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.missTolerance", mTermMissTolerance);
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262 |
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263 |
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264 | //////////////////////////////
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265 | //-- max cost ratio for early tree termination
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266 |
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267 | Environment::GetSingleton()->GetFloatValue("BvHierarchy.Termination.maxCostRatio", mTermMaxCostRatio);
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268 | Environment::GetSingleton()->GetFloatValue("BvHierarchy.Termination.minGlobalCostRatio",
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269 | mTermMinGlobalCostRatio);
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270 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.globalCostMissTolerance",
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271 | mTermGlobalCostMissTolerance);
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272 |
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273 |
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274 | //////////////////////////////
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275 | //-- factors for subdivision heuristics
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276 |
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277 | // if only the driving axis is used for splits
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278 | Environment::GetSingleton()->GetBoolValue("BvHierarchy.splitUseOnlyDrivingAxis", mOnlyDrivingAxis);
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279 | Environment::GetSingleton()->GetFloatValue("BvHierarchy.maxStaticMemory", mMaxMemory);
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280 | Environment::GetSingleton()->GetBoolValue("BvHierarchy.useCostHeuristics", mUseCostHeuristics);
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281 | Environment::GetSingleton()->GetBoolValue("BvHierarchy.useSah", mUseSah);
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282 |
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283 | char subdivisionStatsLog[100];
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284 | Environment::GetSingleton()->GetStringValue("BvHierarchy.subdivisionStats", subdivisionStatsLog);
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285 | mSubdivisionStats.open(subdivisionStatsLog);
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286 |
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287 | Environment::GetSingleton()->GetFloatValue(
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288 | "BvHierarchy.Construction.renderCostDecreaseWeight", mRenderCostDecreaseWeight);
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289 | Environment::GetSingleton()->GetBoolValue(
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290 | "BvHierarchy.Construction.useGlobalSorting", mUseGlobalSorting);
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291 | Environment::GetSingleton()->GetIntValue("BvHierarchy.minRaysForVisibility", mMinRaysForVisibility);
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292 | Environment::GetSingleton()->GetIntValue("BvHierarchy.maxTests", mMaxTests);
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293 |
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294 | //mMemoryConst = (float)(sizeof(VspLeaf) + sizeof(VspViewCell));
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295 | //mMemoryConst = (float)sizeof(BvhLeaf);
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296 | mMemoryConst = (float)sizeof(ObjectContainer);
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297 | cout << "bvh memcost: " << mMemoryConst << endl;
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298 | cout << "triangle: " << sizeof(TriangleIntersectable) << endl;
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299 | cout << "triangle: " << sizeof(Intersectable) << endl;
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300 | cout << "triangle: " << sizeof(ObjectContainer) << endl;
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301 | cout << "triangle: " << sizeof(float) << endl;
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302 | cout << "triangle: " << sizeof(int) << endl;
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303 |
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304 | mUseBboxAreaForSah = true;
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305 |
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306 | /////////////
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307 | //-- debug output
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308 |
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309 | Debug << "******* Bvh hierarchy options ******** " << endl;
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310 | Debug << "max depth: " << mTermMaxDepth << endl;
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311 | Debug << "min probabiliy: " << mTermMinProbability<< endl;
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312 | Debug << "min objects: " << mTermMinObjects << endl;
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313 | Debug << "max cost ratio: " << mTermMaxCostRatio << endl;
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314 | Debug << "miss tolerance: " << mTermMissTolerance << endl;
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315 | Debug << "max leaves: " << mTermMaxLeaves << endl;
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316 | Debug << "randomize: " << randomize << endl;
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317 | Debug << "min global cost ratio: " << mTermMinGlobalCostRatio << endl;
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318 | Debug << "global cost miss tolerance: " << mTermGlobalCostMissTolerance << endl;
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319 | Debug << "only driving axis: " << mOnlyDrivingAxis << endl;
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320 | Debug << "max memory: " << mMaxMemory << endl;
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321 | Debug << "use cost heuristics: " << mUseCostHeuristics << endl;
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322 | Debug << "use sah (surface area heuristics: " << mUseSah << endl;
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323 | Debug << "subdivision stats log: " << subdivisionStatsLog << endl;
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324 | Debug << "split borders: " << mSplitBorder << endl;
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325 | Debug << "render cost decrease weight: " << mRenderCostDecreaseWeight << endl;
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326 | Debug << "use global sort: " << mUseGlobalSorting << endl;
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327 | Debug << "minimal rays for visibility: " << mMinRaysForVisibility << endl;
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328 | Debug << "bvh mem const: " << mMemoryConst << endl;
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329 |
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330 | Debug << endl;
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331 | }
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332 |
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333 |
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334 | void BvHierarchy::AssociateObjectsWithLeaf(BvhLeaf *leaf)
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335 | {
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336 | ObjectContainer::const_iterator oit, oit_end = leaf->mObjects.end();
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337 |
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338 | for (oit = leaf->mObjects.begin(); oit != oit_end; ++ oit)
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339 | {
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340 | (*oit)->mBvhLeaf = leaf;
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341 | }
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342 | }
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343 |
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344 |
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345 | static int CountRays(const ObjectContainer &objects)
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346 | {
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347 | int nRays = 0;
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348 |
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349 | ObjectContainer::const_iterator oit, oit_end = objects.end();
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350 |
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351 | for (oit = objects.begin(); oit != oit_end; ++ oit)
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352 | {
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353 | nRays += (int)(*oit)->GetOrCreateRays()->size();
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354 | }
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355 |
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356 | return nRays;
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357 | }
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358 |
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359 |
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360 | BvhInterior *BvHierarchy::SubdivideNode(const BvhSubdivisionCandidate &sc,
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361 | BvhTraversalData &frontData,
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362 | BvhTraversalData &backData)
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363 | {
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364 | const BvhTraversalData &tData = sc.mParentData;
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365 | BvhLeaf *leaf = tData.mNode;
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366 | AxisAlignedBox3 parentBox = leaf->GetBoundingBox();
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367 |
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368 | // update stats: we have two new leaves
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369 | mBvhStats.nodes += 2;
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370 |
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371 | if (tData.mDepth > mBvhStats.maxDepth)
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372 | {
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373 | mBvhStats.maxDepth = tData.mDepth;
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374 | }
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375 |
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376 | // add the new nodes to the tree
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377 | BvhInterior *node = new BvhInterior(parentBox, leaf->GetParent());
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378 |
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379 |
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380 | //////////////////
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381 | //-- create front and back leaf
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382 |
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383 | AxisAlignedBox3 fbox = EvalBoundingBox(sc.mFrontObjects, &parentBox);
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384 | AxisAlignedBox3 bbox = EvalBoundingBox(sc.mBackObjects, &parentBox);
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385 |
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386 | BvhLeaf *back = new BvhLeaf(bbox, node, (int)sc.mBackObjects.size());
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387 | BvhLeaf *front = new BvhLeaf(fbox, node, (int)sc.mFrontObjects.size());
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388 |
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389 | BvhInterior *parent = leaf->GetParent();
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390 |
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391 | // replace a link from node's parent
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392 | if (parent)
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393 | {
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394 | parent->ReplaceChildLink(leaf, node);
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395 | node->SetParent(parent);
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396 | }
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397 | else // no parent => this node is the root
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398 | {
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399 | mRoot = node;
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400 | }
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401 |
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402 | // and setup child links
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403 | node->SetupChildLinks(front, back);
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404 |
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405 | ++ mBvhStats.splits;
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406 |
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407 |
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408 | ////////////////////////////////////////
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409 | //-- fill front and back traversal data with the new values
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410 |
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411 | frontData.mDepth = backData.mDepth = tData.mDepth + 1;
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412 |
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413 | frontData.mNode = front;
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414 | backData.mNode = back;
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415 |
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416 | back->mObjects = sc.mBackObjects;
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417 | front->mObjects = sc.mFrontObjects;
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418 |
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419 | // if the number of rays is too low, no assumptions can be made
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420 | // (=> switch to surface area heuristics?)
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421 | frontData.mNumRays = CountRays(sc.mFrontObjects);
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422 | backData.mNumRays = CountRays(sc.mBackObjects);
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423 |
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424 | AssociateObjectsWithLeaf(back);
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425 | AssociateObjectsWithLeaf(front);
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426 |
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427 | #if PROBABILIY_IS_BV_VOLUME
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428 | // volume of bvh (= probability that this bvh can be seen)
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429 | frontData.mProbability = fbox.GetVolume();
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430 | backData.mProbability = bbox.GetVolume();
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431 | #else
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432 | // compute probability of this node being visible,
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433 | // i.e., volume of the view cells that can see this node
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434 | frontData.mProbability = EvalViewCellsVolume(sc.mFrontObjects);
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435 | backData.mProbability = EvalViewCellsVolume(sc.mBackObjects);
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436 | #endif
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437 |
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438 | // how often was max cost ratio missed in this branch?
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439 | frontData.mMaxCostMisses = sc.GetMaxCostMisses();
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440 | backData.mMaxCostMisses = sc.GetMaxCostMisses();
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441 |
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442 | // set the time stamp so the order of traversal can be reconstructed
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443 | node->mTimeStamp = mHierarchyManager->mTimeStamp ++;
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444 |
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445 | // assign the objects in sorted order
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446 | if (mUseGlobalSorting)
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447 | {
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448 | AssignSortedObjects(sc, frontData, backData);
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449 | }
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450 |
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451 | // return the new interior node
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452 | return node;
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453 | }
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454 |
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455 |
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456 | BvhNode *BvHierarchy::Subdivide(SplitQueue &tQueue,
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457 | SubdivisionCandidate *splitCandidate,
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458 | const bool globalCriteriaMet)
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459 | {
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460 | BvhSubdivisionCandidate *sc = dynamic_cast<BvhSubdivisionCandidate *>(splitCandidate);
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461 | BvhTraversalData &tData = sc->mParentData;
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462 |
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463 | BvhNode *currentNode = tData.mNode;
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464 |
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465 | if (!LocalTerminationCriteriaMet(tData) && !globalCriteriaMet)
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466 | {
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467 | //////////////
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468 | //-- continue subdivision
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469 |
|
---|
470 | BvhTraversalData tFrontData;
|
---|
471 | BvhTraversalData tBackData;
|
---|
472 |
|
---|
473 | // create new interior node and two leaf node
|
---|
474 | currentNode = SubdivideNode(*sc, tFrontData, tBackData);
|
---|
475 |
|
---|
476 | // decrease the weighted average cost of the subdivisoin
|
---|
477 | mTotalCost -= sc->GetRenderCostDecrease();
|
---|
478 | mPvsEntries += sc->GetPvsEntriesIncr();
|
---|
479 |
|
---|
480 | // subdivision statistics
|
---|
481 | if (1) PrintSubdivisionStats(*sc);
|
---|
482 |
|
---|
483 |
|
---|
484 | ///////////////////////////
|
---|
485 | //-- push the new split candidates on the queue
|
---|
486 |
|
---|
487 | BvhSubdivisionCandidate *frontCandidate = new BvhSubdivisionCandidate(tFrontData);
|
---|
488 | BvhSubdivisionCandidate *backCandidate = new BvhSubdivisionCandidate(tBackData);
|
---|
489 |
|
---|
490 | EvalSubdivisionCandidate(*frontCandidate);
|
---|
491 | EvalSubdivisionCandidate(*backCandidate);
|
---|
492 |
|
---|
493 | // cross reference
|
---|
494 | tFrontData.mNode->SetSubdivisionCandidate(frontCandidate);
|
---|
495 | tBackData.mNode->SetSubdivisionCandidate(backCandidate);
|
---|
496 |
|
---|
497 | //cout << "f: " << frontCandidate->GetPriority() << " b: " << backCandidate->GetPriority() << endl;
|
---|
498 | tQueue.Push(frontCandidate);
|
---|
499 | tQueue.Push(backCandidate);
|
---|
500 | }
|
---|
501 |
|
---|
502 | /////////////////////////////////
|
---|
503 | //-- node is a leaf => terminate traversal
|
---|
504 |
|
---|
505 | if (currentNode->IsLeaf())
|
---|
506 | {
|
---|
507 | /////////////////////
|
---|
508 | //-- store additional info
|
---|
509 | EvaluateLeafStats(tData);
|
---|
510 |
|
---|
511 | const bool mStoreRays = true;
|
---|
512 | if (mStoreRays)
|
---|
513 | {
|
---|
514 | BvhLeaf *leaf = dynamic_cast<BvhLeaf *>(currentNode);
|
---|
515 | // CollectRays(leaf->mObjects, leaf->mVssRays);
|
---|
516 | }
|
---|
517 |
|
---|
518 | //////////////////////////////////////
|
---|
519 |
|
---|
520 | // this leaf is no candidate for splitting anymore
|
---|
521 | // => detach subdivision candidate
|
---|
522 | tData.mNode->SetSubdivisionCandidate(NULL);
|
---|
523 | // detach node so we don't delete it with the traversal data
|
---|
524 | tData.mNode = NULL;
|
---|
525 | }
|
---|
526 |
|
---|
527 | return currentNode;
|
---|
528 | }
|
---|
529 |
|
---|
530 |
|
---|
531 | void BvHierarchy::EvalSubdivisionCandidate(BvhSubdivisionCandidate &splitCandidate,
|
---|
532 | bool computeSplitPlane)
|
---|
533 | {
|
---|
534 | if (computeSplitPlane)
|
---|
535 | {
|
---|
536 | const bool sufficientSamples =
|
---|
537 | splitCandidate.mParentData.mNumRays > mMinRaysForVisibility;
|
---|
538 |
|
---|
539 | const bool useVisibiliyBasedHeuristics =
|
---|
540 | !mUseSah &&
|
---|
541 | (mHierarchyManager->GetViewSpaceSubdivisionType() ==
|
---|
542 | HierarchyManager::KD_BASED_VIEWSPACE_SUBDIV) &&
|
---|
543 | sufficientSamples;
|
---|
544 |
|
---|
545 | // compute best object partition
|
---|
546 | const float ratio = SelectObjectPartition(splitCandidate.mParentData,
|
---|
547 | splitCandidate.mFrontObjects,
|
---|
548 | splitCandidate.mBackObjects,
|
---|
549 | useVisibiliyBasedHeuristics);
|
---|
550 |
|
---|
551 | // cost ratio violated?
|
---|
552 | const bool maxCostRatioViolated = mTermMaxCostRatio < ratio;
|
---|
553 | const int previousMisses = splitCandidate.mParentData.mMaxCostMisses;
|
---|
554 |
|
---|
555 | splitCandidate.SetMaxCostMisses(maxCostRatioViolated ? previousMisses + 1 : previousMisses);
|
---|
556 |
|
---|
557 | }
|
---|
558 |
|
---|
559 | BvhLeaf *leaf = splitCandidate.mParentData.mNode;
|
---|
560 |
|
---|
561 | const float oldProp = EvalViewCellsVolume(leaf->mObjects);
|
---|
562 | const float oldRenderCost = EvalRenderCost(leaf->mObjects);
|
---|
563 |
|
---|
564 | // compute global decrease in render cost
|
---|
565 | const float newRenderCost = EvalRenderCost(splitCandidate.mFrontObjects) +
|
---|
566 | EvalRenderCost(splitCandidate.mBackObjects);
|
---|
567 |
|
---|
568 | const float renderCostDecr = oldRenderCost - newRenderCost;
|
---|
569 |
|
---|
570 | splitCandidate.SetRenderCostDecrease(renderCostDecr);
|
---|
571 |
|
---|
572 | // increase in pvs entries
|
---|
573 | const int pvsEntriesIncr = EvalPvsEntriesIncr(splitCandidate);
|
---|
574 | splitCandidate.SetPvsEntriesIncr(pvsEntriesIncr);
|
---|
575 |
|
---|
576 | #ifdef GTP_DEBUG
|
---|
577 | Debug << "old render cost: " << oldRenderCost << endl;
|
---|
578 | Debug << "new render cost: " << newRenderCost << endl;
|
---|
579 | Debug << "render cost decrease: " << renderCostDecr << endl;
|
---|
580 | #endif
|
---|
581 |
|
---|
582 | float priority;
|
---|
583 |
|
---|
584 | // surface area heuristics is used when there is no view space subdivision available.
|
---|
585 | // In order to have some prioritized traversal, use this formula instead
|
---|
586 | if (mHierarchyManager->GetViewSpaceSubdivisionType() ==
|
---|
587 | HierarchyManager::NO_VIEWSPACE_SUBDIV)
|
---|
588 | {
|
---|
589 | priority = EvalSahCost(leaf);
|
---|
590 | }
|
---|
591 | else
|
---|
592 | {
|
---|
593 | // take render cost of node into account
|
---|
594 | // otherwise danger of being stuck in a local minimum!
|
---|
595 | const float factor = mRenderCostDecreaseWeight;
|
---|
596 |
|
---|
597 | if (1)
|
---|
598 | {
|
---|
599 | priority = factor * renderCostDecr + (1.0f - factor) * oldRenderCost;
|
---|
600 | if (mHierarchyManager->mConsiderMemory2)
|
---|
601 | {
|
---|
602 | priority /= ((float)splitCandidate.GetPvsEntriesIncr() + mMemoryConst);
|
---|
603 | }
|
---|
604 | }
|
---|
605 | else
|
---|
606 | {
|
---|
607 | if (!mHierarchyManager->mConsiderMemory2)
|
---|
608 | {
|
---|
609 | priority = factor * renderCostDecr + (1.0f - factor) * oldRenderCost;
|
---|
610 | }
|
---|
611 | else
|
---|
612 | {
|
---|
613 | const float ratio =
|
---|
614 | renderCostDecr / ((float)splitCandidate.GetPvsEntriesIncr() + mMemoryConst);
|
---|
615 |
|
---|
616 | priority = factor * ratio + (1.0f - factor) * oldRenderCost;
|
---|
617 | }
|
---|
618 | }
|
---|
619 | }
|
---|
620 |
|
---|
621 | // compute global decrease in render cost
|
---|
622 | splitCandidate.SetPriority(priority);
|
---|
623 | }
|
---|
624 |
|
---|
625 |
|
---|
626 | int BvHierarchy::EvalPvsEntriesIncr(BvhSubdivisionCandidate &splitCandidate) const
|
---|
627 | {
|
---|
628 | const int oldPvsSize = CountViewCells(splitCandidate.mParentData.mNode->mObjects);
|
---|
629 |
|
---|
630 | const int fPvsSize = CountViewCells(splitCandidate.mFrontObjects);
|
---|
631 | const int bPvsSize = CountViewCells(splitCandidate.mBackObjects);
|
---|
632 |
|
---|
633 | return fPvsSize + bPvsSize - oldPvsSize;
|
---|
634 | }
|
---|
635 |
|
---|
636 |
|
---|
637 | inline bool BvHierarchy::LocalTerminationCriteriaMet(const BvhTraversalData &data) const
|
---|
638 | {
|
---|
639 | const bool terminationCriteriaMet =
|
---|
640 | (0
|
---|
641 | || ((int)data.mNode->mObjects.size() <= 1)//mTermMinObjects)
|
---|
642 | //|| (data.mProbability <= mTermMinProbability)
|
---|
643 | //|| (data.mNumRays <= mTermMinRays)
|
---|
644 | );
|
---|
645 |
|
---|
646 | #ifdef _DEBUG
|
---|
647 | if (terminationCriteriaMet)
|
---|
648 | {
|
---|
649 | cout << "bvh local termination criteria met:" << endl;
|
---|
650 | cout << "objects: " << data.mNode->mObjects.size() << " " << mTermMinObjects << endl;
|
---|
651 | }
|
---|
652 | #endif
|
---|
653 | return terminationCriteriaMet;
|
---|
654 | }
|
---|
655 |
|
---|
656 |
|
---|
657 | inline bool BvHierarchy::GlobalTerminationCriteriaMet(const BvhTraversalData &data) const
|
---|
658 | {
|
---|
659 | // note: tracking for global cost termination
|
---|
660 | // does not make much sense for interleaved vsp / osp partition
|
---|
661 | // as it is the responsibility of the hierarchy manager
|
---|
662 |
|
---|
663 | const bool terminationCriteriaMet =
|
---|
664 | (0
|
---|
665 | || (mBvhStats.Leaves() >= mTermMaxLeaves)
|
---|
666 | //|| (mBvhStats.mGlobalCostMisses >= mTermGlobalCostMissTolerance)
|
---|
667 | //|| mOutOfMemory
|
---|
668 | );
|
---|
669 |
|
---|
670 | #ifdef GTP_DEBUG
|
---|
671 | if (terminationCriteriaMet)
|
---|
672 | {
|
---|
673 | Debug << "bvh global termination criteria met:" << endl;
|
---|
674 | Debug << "cost misses: " << mBvhStats.mGlobalCostMisses << " " << mTermGlobalCostMissTolerance << endl;
|
---|
675 | Debug << "leaves: " << mBvhStats.Leaves() << " " << mTermMaxLeaves << endl;
|
---|
676 | }
|
---|
677 | #endif
|
---|
678 | return terminationCriteriaMet;
|
---|
679 | }
|
---|
680 |
|
---|
681 |
|
---|
682 | void BvHierarchy::EvaluateLeafStats(const BvhTraversalData &data)
|
---|
683 | {
|
---|
684 | // the node became a leaf -> evaluate stats for leafs
|
---|
685 | BvhLeaf *leaf = data.mNode;
|
---|
686 |
|
---|
687 | ++ mCreatedLeaves;
|
---|
688 |
|
---|
689 |
|
---|
690 | if (data.mProbability <= mTermMinProbability)
|
---|
691 | {
|
---|
692 | ++ mBvhStats.minProbabilityNodes;
|
---|
693 | }
|
---|
694 |
|
---|
695 | ////////////////////////////////////////////
|
---|
696 | // depth related stuff
|
---|
697 |
|
---|
698 | if (data.mDepth < mBvhStats.minDepth)
|
---|
699 | {
|
---|
700 | mBvhStats.minDepth = data.mDepth;
|
---|
701 | }
|
---|
702 |
|
---|
703 | if (data.mDepth >= mTermMaxDepth)
|
---|
704 | {
|
---|
705 | ++ mBvhStats.maxDepthNodes;
|
---|
706 | }
|
---|
707 |
|
---|
708 | // accumulate depth to compute average depth
|
---|
709 | mBvhStats.accumDepth += data.mDepth;
|
---|
710 |
|
---|
711 |
|
---|
712 | ////////////////////////////////////////////
|
---|
713 | // objects related stuff
|
---|
714 |
|
---|
715 | // note: the sum should alwaysbe total number of objects for bvh
|
---|
716 | mBvhStats.objectRefs += (int)leaf->mObjects.size();
|
---|
717 |
|
---|
718 | if ((int)leaf->mObjects.size() <= mTermMinObjects)
|
---|
719 | {
|
---|
720 | ++ mBvhStats.minObjectsNodes;
|
---|
721 | }
|
---|
722 |
|
---|
723 | if (leaf->mObjects.empty())
|
---|
724 | {
|
---|
725 | ++ mBvhStats.emptyNodes;
|
---|
726 | }
|
---|
727 |
|
---|
728 | if ((int)leaf->mObjects.size() > mBvhStats.maxObjectRefs)
|
---|
729 | {
|
---|
730 | mBvhStats.maxObjectRefs = (int)leaf->mObjects.size();
|
---|
731 | }
|
---|
732 |
|
---|
733 | if ((int)leaf->mObjects.size() < mBvhStats.minObjectRefs)
|
---|
734 | {
|
---|
735 | mBvhStats.minObjectRefs = (int)leaf->mObjects.size();
|
---|
736 | }
|
---|
737 |
|
---|
738 | ////////////////////////////////////////////
|
---|
739 | // ray related stuff
|
---|
740 |
|
---|
741 | // note: this number should always accumulate to the total number of rays
|
---|
742 | mBvhStats.rayRefs += data.mNumRays;
|
---|
743 |
|
---|
744 | if (data.mNumRays <= mTermMinRays)
|
---|
745 | {
|
---|
746 | ++ mBvhStats.minRaysNodes;
|
---|
747 | }
|
---|
748 |
|
---|
749 | if (data.mNumRays > mBvhStats.maxRayRefs)
|
---|
750 | {
|
---|
751 | mBvhStats.maxRayRefs = data.mNumRays;
|
---|
752 | }
|
---|
753 |
|
---|
754 | if (data.mNumRays < mBvhStats.minRayRefs)
|
---|
755 | {
|
---|
756 | mBvhStats.minRayRefs = data.mNumRays;
|
---|
757 | }
|
---|
758 |
|
---|
759 | #ifdef _DEBUG
|
---|
760 | cout << "depth: " << data.mDepth << " objects: " << (int)leaf->mObjects.size()
|
---|
761 | << " rays: " << data.mNumRays << " rays / objects "
|
---|
762 | << (float)data.mNumRays / (float)leaf->mObjects.size() << endl;
|
---|
763 | #endif
|
---|
764 | }
|
---|
765 |
|
---|
766 |
|
---|
767 | #if 0
|
---|
768 |
|
---|
769 | /// compute object boundaries using spatial mid split
|
---|
770 | float BvHierarchy::EvalLocalObjectPartition(const BvhTraversalData &tData,
|
---|
771 | const int axis,
|
---|
772 | ObjectContainer &objectsFront,
|
---|
773 | ObjectContainer &objectsBack)
|
---|
774 | {
|
---|
775 | const float maxBox = tData.mBoundingBox.Max(axis);
|
---|
776 | const float minBox = tData.mBoundingBox.Min(axis);
|
---|
777 |
|
---|
778 | float midPoint = (maxBox + minBox) * 0.5f;
|
---|
779 |
|
---|
780 | ObjectContainer::const_iterator oit, oit_end = tData.mNode->mObjects.end();
|
---|
781 |
|
---|
782 | for (oit = tData.mNode->mObjects.begin(); oit != oit_end; ++ oit)
|
---|
783 | {
|
---|
784 | Intersectable *obj = *oit;
|
---|
785 | const AxisAlignedBox3 box = obj->GetBox();
|
---|
786 |
|
---|
787 | const float objMid = (box.Max(axis) + box.Min(axis)) * 0.5f;
|
---|
788 |
|
---|
789 | // object mailed => belongs to back objects
|
---|
790 | if (objMid < midPoint)
|
---|
791 | {
|
---|
792 | objectsBack.push_back(obj);
|
---|
793 | }
|
---|
794 | else
|
---|
795 | {
|
---|
796 | objectsFront.push_back(obj);
|
---|
797 | }
|
---|
798 | }
|
---|
799 |
|
---|
800 | const float oldRenderCost = EvalRenderCost(tData.mNode->mObjects);
|
---|
801 | const float newRenderCost = EvalRenderCost(objectsFront) * EvalRenderCost(objectsBack);
|
---|
802 |
|
---|
803 | const float ratio = newRenderCost / oldRenderCost;
|
---|
804 | return ratio;
|
---|
805 | }
|
---|
806 |
|
---|
807 | #else
|
---|
808 |
|
---|
809 | /// compute object partition by getting balanced objects on the left and right side
|
---|
810 | float BvHierarchy::EvalLocalObjectPartition(const BvhTraversalData &tData,
|
---|
811 | const int axis,
|
---|
812 | ObjectContainer &objectsFront,
|
---|
813 | ObjectContainer &objectsBack)
|
---|
814 | {
|
---|
815 | PrepareLocalSubdivisionCandidates(tData, axis);
|
---|
816 |
|
---|
817 | SortableEntryContainer::const_iterator cit, cit_end = mSubdivisionCandidates->end();
|
---|
818 |
|
---|
819 | int i = 0;
|
---|
820 | const int border = (int)tData.mNode->mObjects.size() / 2;
|
---|
821 |
|
---|
822 | for (cit = mSubdivisionCandidates->begin(); cit != cit_end; ++ cit, ++ i)
|
---|
823 | {
|
---|
824 | Intersectable *obj = (*cit).mObject;
|
---|
825 |
|
---|
826 | // object mailed => belongs to back objects
|
---|
827 | if (i < border)
|
---|
828 | {
|
---|
829 | objectsBack.push_back(obj);
|
---|
830 | }
|
---|
831 | else
|
---|
832 | {
|
---|
833 | objectsFront.push_back(obj);
|
---|
834 | }
|
---|
835 | }
|
---|
836 |
|
---|
837 | #if 1
|
---|
838 | const float cost = (tData.mNode->GetBoundingBox().Size().DrivingAxis() == axis) ? -1.0f : 0.0f;
|
---|
839 | #else
|
---|
840 | const float oldRenderCost = EvalRenderCost(tData.mNode->mObjects);
|
---|
841 | const float newRenderCost = EvalRenderCost(objectsFront) * EvalRenderCost(objectsBack);
|
---|
842 |
|
---|
843 | const float cost = newRenderCost / oldRenderCost;
|
---|
844 | #endif
|
---|
845 |
|
---|
846 | return cost;
|
---|
847 | }
|
---|
848 | #endif
|
---|
849 |
|
---|
850 | #if 1
|
---|
851 |
|
---|
852 | float BvHierarchy::EvalSah(const BvhTraversalData &tData,
|
---|
853 | const int axis,
|
---|
854 | ObjectContainer &objectsFront,
|
---|
855 | ObjectContainer &objectsBack)
|
---|
856 | {
|
---|
857 | // go through the lists, count the number of objects left and right
|
---|
858 | // and evaluate the following cost funcion:
|
---|
859 | // C = ct_div_ci + (ol + or) / queries
|
---|
860 | PrepareLocalSubdivisionCandidates(tData, axis);
|
---|
861 |
|
---|
862 | const float totalRenderCost = EvalAbsCost(tData.mNode->mObjects);
|
---|
863 | float objectsLeft = 0, objectsRight = totalRenderCost;
|
---|
864 |
|
---|
865 | const AxisAlignedBox3 nodeBbox = tData.mNode->GetBoundingBox();
|
---|
866 | const float boxArea = nodeBbox.SurfaceArea();
|
---|
867 |
|
---|
868 | float minSum = 1e20f;
|
---|
869 |
|
---|
870 | float minBorder = nodeBbox.Max(axis);
|
---|
871 | float maxBorder = nodeBbox.Min(axis);
|
---|
872 |
|
---|
873 | float areaLeft = 0, areaRight = 0;
|
---|
874 |
|
---|
875 | SortableEntryContainer::const_iterator currentPos =
|
---|
876 | mSubdivisionCandidates->begin();
|
---|
877 |
|
---|
878 | vector<float> bordersRight;
|
---|
879 |
|
---|
880 | // we keep track of both borders of the bounding boxes =>
|
---|
881 | // store the events in descending order
|
---|
882 |
|
---|
883 | bordersRight.resize(mSubdivisionCandidates->size());
|
---|
884 |
|
---|
885 | SortableEntryContainer::reverse_iterator rcit =
|
---|
886 | mSubdivisionCandidates->rbegin(), rcit_end =
|
---|
887 | mSubdivisionCandidates->rend();
|
---|
888 |
|
---|
889 | vector<float>::reverse_iterator rbit = bordersRight.rbegin();
|
---|
890 |
|
---|
891 | for (; rcit != rcit_end; ++ rcit, ++ rbit)
|
---|
892 | {
|
---|
893 | Intersectable *obj = (*rcit).mObject;
|
---|
894 | const AxisAlignedBox3 obox = obj->GetBox();
|
---|
895 |
|
---|
896 | if (obox.Min(axis) < minBorder)
|
---|
897 | {
|
---|
898 | minBorder = obox.Min(axis);
|
---|
899 | }
|
---|
900 |
|
---|
901 | (*rbit) = minBorder;
|
---|
902 | }
|
---|
903 |
|
---|
904 | // temporary surface areas
|
---|
905 | float al = 0;
|
---|
906 | float ar = boxArea;
|
---|
907 |
|
---|
908 | vector<float>::const_iterator bit = bordersRight.begin();
|
---|
909 | SortableEntryContainer::const_iterator cit, cit_end = mSubdivisionCandidates->end();
|
---|
910 |
|
---|
911 | for (cit = mSubdivisionCandidates->begin(); cit != cit_end; ++ cit, ++ bit)
|
---|
912 | {
|
---|
913 | Intersectable *obj = (*cit).mObject;
|
---|
914 |
|
---|
915 | const float renderCost = mViewCellsManager->EvalRenderCost(obj);
|
---|
916 |
|
---|
917 | objectsLeft += renderCost;
|
---|
918 | objectsRight -= renderCost;
|
---|
919 |
|
---|
920 | const AxisAlignedBox3 obox = obj->GetBox();
|
---|
921 |
|
---|
922 | // the borders of the bounding boxes have changed
|
---|
923 | if (obox.Max(axis) > maxBorder)
|
---|
924 | {
|
---|
925 | maxBorder = obox.Max(axis);
|
---|
926 | }
|
---|
927 |
|
---|
928 | minBorder = (*bit);
|
---|
929 |
|
---|
930 | AxisAlignedBox3 lbox = nodeBbox;
|
---|
931 | AxisAlignedBox3 rbox = nodeBbox;
|
---|
932 |
|
---|
933 | lbox.SetMax(axis, maxBorder);
|
---|
934 | rbox.SetMin(axis, minBorder);
|
---|
935 |
|
---|
936 | al = lbox.SurfaceArea();
|
---|
937 | ar = rbox.SurfaceArea();
|
---|
938 |
|
---|
939 | const bool noValidSplit = ((objectsLeft <= Limits::Small) || (objectsRight <= Limits::Small));
|
---|
940 | const float sum = noValidSplit ? 1e25 : objectsLeft * al + objectsRight * ar;
|
---|
941 |
|
---|
942 | /*cout << "pos=" << (*cit).mPos << "\t q=(" << objectsLeft << "," << objectsRight <<")\t r=("
|
---|
943 | << lbox.SurfaceArea() << "," << rbox.SurfaceArea() << ")" << endl;
|
---|
944 | cout << "minborder: " << minBorder << " maxborder: " << maxBorder << endl;
|
---|
945 | cout << "cost= " << sum << endl;*/
|
---|
946 |
|
---|
947 | if (sum < minSum)
|
---|
948 | {
|
---|
949 | minSum = sum;
|
---|
950 | areaLeft = al;
|
---|
951 | areaRight = ar;
|
---|
952 |
|
---|
953 | // objects belong to left side now
|
---|
954 | for (; currentPos != (cit + 1); ++ currentPos);
|
---|
955 | }
|
---|
956 | }
|
---|
957 |
|
---|
958 | ////////////
|
---|
959 | //-- assign object to front and back volume
|
---|
960 |
|
---|
961 | // belongs to back bv
|
---|
962 | for (cit = mSubdivisionCandidates->begin(); cit != currentPos; ++ cit)
|
---|
963 | objectsBack.push_back((*cit).mObject);
|
---|
964 |
|
---|
965 | // belongs to front bv
|
---|
966 | for (cit = currentPos; cit != cit_end; ++ cit)
|
---|
967 | objectsFront.push_back((*cit).mObject);
|
---|
968 |
|
---|
969 | float newCost = minSum / boxArea;
|
---|
970 | float ratio = newCost / totalRenderCost;
|
---|
971 |
|
---|
972 | #ifdef GTP_DEBUG
|
---|
973 | cout << "\n\nobjects=(" << (int)objectsBack.size() << "," << (int)objectsFront.size() << " of "
|
---|
974 | << (int)tData.mNode->mObjects.size() << ")\t area=("
|
---|
975 | << areaLeft << ", " << areaRight << ", " << boxArea << ")" << endl
|
---|
976 | << "cost= " << newCost << " oldCost=" << totalRenderCost / boxArea << endl;
|
---|
977 | #endif
|
---|
978 |
|
---|
979 | return ratio;
|
---|
980 | }
|
---|
981 |
|
---|
982 | #else
|
---|
983 |
|
---|
984 | float BvHierarchy::EvalSah(const BvhTraversalData &tData,
|
---|
985 | const int axis,
|
---|
986 | ObjectContainer &objectsFront,
|
---|
987 | ObjectContainer &objectsBack)
|
---|
988 | {
|
---|
989 | // go through the lists, count the number of objects left and right
|
---|
990 | // and evaluate the following cost funcion:
|
---|
991 | // C = ct_div_ci + (ol + or) / queries
|
---|
992 | PrepareLocalSubdivisionCandidates(tData, axis);
|
---|
993 |
|
---|
994 | const float totalRenderCost = EvalAbsCost(tData.mNode->mObjects);
|
---|
995 | float objectsLeft = 0, objectsRight = totalRenderCost;
|
---|
996 |
|
---|
997 | const AxisAlignedBox3 nodeBbox = tData.mNode->GetBoundingBox();
|
---|
998 |
|
---|
999 | const float minBox = nodeBbox.Min(axis);
|
---|
1000 | const float maxBox = nodeBbox.Max(axis);
|
---|
1001 | const float boxArea = nodeBbox.SurfaceArea();
|
---|
1002 |
|
---|
1003 | float minSum = 1e20f;
|
---|
1004 |
|
---|
1005 | Vector3 minBorder = nodeBbox.Max();
|
---|
1006 | Vector3 maxBorder = nodeBbox.Min();
|
---|
1007 |
|
---|
1008 | float areaLeft = 0, areaRight = 0;
|
---|
1009 |
|
---|
1010 | SortableEntryContainer::const_iterator currentPos =
|
---|
1011 | mSubdivisionCandidates->begin();
|
---|
1012 |
|
---|
1013 | vector<Vector3> bordersRight;
|
---|
1014 |
|
---|
1015 | // we keep track of both borders of the bounding boxes =>
|
---|
1016 | // store the events in descending order
|
---|
1017 | bordersRight.resize(mSubdivisionCandidates->size());
|
---|
1018 |
|
---|
1019 | SortableEntryContainer::reverse_iterator rcit =
|
---|
1020 | mSubdivisionCandidates->rbegin(), rcit_end =
|
---|
1021 | mSubdivisionCandidates->rend();
|
---|
1022 |
|
---|
1023 | vector<Vector3>::reverse_iterator rbit = bordersRight.rbegin();
|
---|
1024 |
|
---|
1025 | for (; rcit != rcit_end; ++ rcit, ++ rbit)
|
---|
1026 | {
|
---|
1027 | Intersectable *obj = (*rcit).mObject;
|
---|
1028 | const AxisAlignedBox3 obox = obj->GetBox();
|
---|
1029 |
|
---|
1030 | for (int i = 0; i < 3; ++ i)
|
---|
1031 | {
|
---|
1032 | if (obox.Min(i) < minBorder[i])
|
---|
1033 | {
|
---|
1034 | minBorder[i] = obox.Min(i);
|
---|
1035 | }
|
---|
1036 | }
|
---|
1037 |
|
---|
1038 | (*rbit) = minBorder;
|
---|
1039 | }
|
---|
1040 |
|
---|
1041 | // temporary surface areas
|
---|
1042 | float al = 0;
|
---|
1043 | float ar = boxArea;
|
---|
1044 |
|
---|
1045 | vector<Vector3>::const_iterator bit = bordersRight.begin();
|
---|
1046 | SortableEntryContainer::const_iterator cit, cit_end =
|
---|
1047 | mSubdivisionCandidates->end();
|
---|
1048 |
|
---|
1049 | for (cit = mSubdivisionCandidates->begin(); cit != cit_end; ++ cit, ++ bit)
|
---|
1050 | {
|
---|
1051 | Intersectable *obj = (*cit).mObject;
|
---|
1052 |
|
---|
1053 | const float renderCost = mViewCellsManager->EvalRenderCost(obj);
|
---|
1054 |
|
---|
1055 | objectsLeft += renderCost;
|
---|
1056 | objectsRight -= renderCost;
|
---|
1057 |
|
---|
1058 | const AxisAlignedBox3 obox = obj->GetBox();
|
---|
1059 |
|
---|
1060 | AxisAlignedBox3 lbox = nodeBbox;
|
---|
1061 | AxisAlignedBox3 rbox = nodeBbox;
|
---|
1062 |
|
---|
1063 | // the borders of the left bounding box have changed
|
---|
1064 | for (int i = 0; i < 3; ++ i)
|
---|
1065 | {
|
---|
1066 | if (obox.Max(i) > maxBorder[i])
|
---|
1067 | {
|
---|
1068 | maxBorder[i] = obox.Max(i);
|
---|
1069 | }
|
---|
1070 | }
|
---|
1071 |
|
---|
1072 | minBorder = (*bit);
|
---|
1073 |
|
---|
1074 | lbox.SetMax(maxBorder);
|
---|
1075 | rbox.SetMin(minBorder);
|
---|
1076 |
|
---|
1077 | al = lbox.SurfaceArea();
|
---|
1078 | ar = rbox.SurfaceArea();
|
---|
1079 |
|
---|
1080 | const bool noValidSplit = ((objectsLeft <= Limits::Small) || (objectsRight <= Limits::Small));
|
---|
1081 | const float sum = noValidSplit ? 1e25 : objectsLeft * al + objectsRight * ar;
|
---|
1082 |
|
---|
1083 | /*cout << "pos=" << (*cit).mPos << "\t q=(" << objectsLeft << "," << objectsRight <<")\t r=("
|
---|
1084 | << lbox.SurfaceArea() << "," << rbox.SurfaceArea() << ")" << endl;
|
---|
1085 | cout << "minborder: " << minBorder << " maxborder: " << maxBorder << endl;
|
---|
1086 | cout << "cost= " << sum << endl;*/
|
---|
1087 |
|
---|
1088 | if (sum < minSum)
|
---|
1089 | {
|
---|
1090 | minSum = sum;
|
---|
1091 | areaLeft = al;
|
---|
1092 | areaRight = ar;
|
---|
1093 |
|
---|
1094 | // objects belong to left side now
|
---|
1095 | for (; currentPos != (cit + 1); ++ currentPos);
|
---|
1096 | }
|
---|
1097 | }
|
---|
1098 |
|
---|
1099 | /////////////
|
---|
1100 | //-- assign object to front and back volume
|
---|
1101 |
|
---|
1102 | // belongs to back bv
|
---|
1103 | for (cit = mSubdivisionCandidates->begin(); cit != currentPos; ++ cit)
|
---|
1104 | objectsBack.push_back((*cit).mObject);
|
---|
1105 |
|
---|
1106 | // belongs to front bv
|
---|
1107 | for (cit = currentPos; cit != cit_end; ++ cit)
|
---|
1108 | objectsFront.push_back((*cit).mObject);
|
---|
1109 |
|
---|
1110 | float newCost = minSum / boxArea;
|
---|
1111 | float ratio = newCost / totalRenderCost;
|
---|
1112 |
|
---|
1113 | #ifdef GTP_DEBUG
|
---|
1114 | cout << "\n\nobjects=(" << (int)objectsBack.size() << "," << (int)objectsFront.size() << " of "
|
---|
1115 | << (int)tData.mNode->mObjects.size() << ")\t area=("
|
---|
1116 | << areaLeft << ", " << areaRight << ", " << boxArea << ")" << endl
|
---|
1117 | << "cost= " << newCost << " oldCost=" << totalRenderCost / boxArea << endl;
|
---|
1118 | #endif
|
---|
1119 |
|
---|
1120 | return ratio;
|
---|
1121 | }
|
---|
1122 |
|
---|
1123 | #endif
|
---|
1124 |
|
---|
1125 | static bool PrepareOutput(const int axis,
|
---|
1126 | const int leaves,
|
---|
1127 | ofstream &sumStats,
|
---|
1128 | ofstream &vollStats,
|
---|
1129 | ofstream &volrStats)
|
---|
1130 | {
|
---|
1131 | if ((axis == 0) && (leaves > 0) && (leaves < 90))
|
---|
1132 | {
|
---|
1133 | char str[64];
|
---|
1134 | sprintf(str, "tmp/bvh_heur_sum-%04d.log", leaves);
|
---|
1135 | sumStats.open(str);
|
---|
1136 | sprintf(str, "tmp/bvh_heur_voll-%04d.log", leaves);
|
---|
1137 | vollStats.open(str);
|
---|
1138 | sprintf(str, "tmp/bvh_heur_volr-%04d.log", leaves);
|
---|
1139 | volrStats.open(str);
|
---|
1140 | }
|
---|
1141 |
|
---|
1142 | return sumStats.is_open() && vollStats.is_open() && volrStats.is_open();
|
---|
1143 | }
|
---|
1144 |
|
---|
1145 |
|
---|
1146 | static void PrintHeuristics(const float objectsRight,
|
---|
1147 | const float sum,
|
---|
1148 | const float volLeft,
|
---|
1149 | const float volRight,
|
---|
1150 | const float viewSpaceVol,
|
---|
1151 | ofstream &sumStats,
|
---|
1152 | ofstream &vollStats,
|
---|
1153 | ofstream &volrStats)
|
---|
1154 | {
|
---|
1155 | sumStats
|
---|
1156 | << "#Position\n" << objectsRight << endl
|
---|
1157 | << "#Sum\n" << sum / viewSpaceVol << endl
|
---|
1158 | << "#Vol\n" << (volLeft + volRight) / viewSpaceVol << endl;
|
---|
1159 |
|
---|
1160 | vollStats
|
---|
1161 | << "#Position\n" << objectsRight << endl
|
---|
1162 | << "#Vol\n" << volLeft / viewSpaceVol << endl;
|
---|
1163 |
|
---|
1164 | volrStats
|
---|
1165 | << "#Position\n" << objectsRight << endl
|
---|
1166 | << "#Vol\n" << volRight / viewSpaceVol << endl;
|
---|
1167 | }
|
---|
1168 |
|
---|
1169 |
|
---|
1170 | float BvHierarchy::EvalLocalCostHeuristics(const BvhTraversalData &tData,
|
---|
1171 | const int axis,
|
---|
1172 | ObjectContainer &objectsFront,
|
---|
1173 | ObjectContainer &objectsBack)
|
---|
1174 | {
|
---|
1175 | ///////////////////////////////////////////////////////
|
---|
1176 | //-- go through the lists, count the number of objects left
|
---|
1177 | //-- and right and evaluate the cost funcion
|
---|
1178 |
|
---|
1179 | // prepare the heuristics by setting mailboxes and counters.
|
---|
1180 | const float totalVol = PrepareHeuristics(tData, axis);
|
---|
1181 |
|
---|
1182 | // local helper variables
|
---|
1183 | float volLeft = 0;
|
---|
1184 | float volRight = totalVol;
|
---|
1185 |
|
---|
1186 | const float nTotalObjects = EvalAbsCost(tData.mNode->mObjects);
|
---|
1187 | float nObjectsLeft = 0;
|
---|
1188 | float nObjectsRight = nTotalObjects;
|
---|
1189 |
|
---|
1190 | const float viewSpaceVol = mViewCellsManager->GetViewSpaceBox().GetVolume();
|
---|
1191 |
|
---|
1192 | SortableEntryContainer::const_iterator backObjectsStart =
|
---|
1193 | mSubdivisionCandidates->begin();
|
---|
1194 |
|
---|
1195 | /////////////////////////////////
|
---|
1196 | //-- the parameters for the current optimum
|
---|
1197 |
|
---|
1198 | float volBack = volLeft;
|
---|
1199 | float volFront = volRight;
|
---|
1200 | float newRenderCost = nTotalObjects * totalVol;
|
---|
1201 |
|
---|
1202 | #ifdef GTP_DEBUG
|
---|
1203 | ofstream sumStats;
|
---|
1204 | ofstream vollStats;
|
---|
1205 | ofstream volrStats;
|
---|
1206 |
|
---|
1207 | const bool printStats =
|
---|
1208 | PrepareOutput(axis, mBvhStats.Leaves(), sumStats, vollStats, volrStats);
|
---|
1209 | #endif
|
---|
1210 |
|
---|
1211 | ///////////////////////
|
---|
1212 | //-- the sweep heuristics
|
---|
1213 | //-- traverse through events and find best split plane
|
---|
1214 |
|
---|
1215 | SortableEntryContainer::const_iterator cit,
|
---|
1216 | cit_end = cit_end = mSubdivisionCandidates->end();
|
---|
1217 |
|
---|
1218 | for (cit = mSubdivisionCandidates->begin(); cit != cit_end; ++ cit)
|
---|
1219 | {
|
---|
1220 | Intersectable *object = (*cit).mObject;
|
---|
1221 |
|
---|
1222 | // evaluate change in l and r volume
|
---|
1223 | // voll = view cells that see only left node (i.e., left pvs)
|
---|
1224 | // volr = view cells that see only right node (i.e., right pvs)
|
---|
1225 | EvalHeuristicsContribution(object, volLeft, volRight);
|
---|
1226 |
|
---|
1227 | const float rc = mViewCellsManager->EvalRenderCost(object);
|
---|
1228 |
|
---|
1229 | nObjectsLeft += rc;
|
---|
1230 | nObjectsRight -= rc;
|
---|
1231 |
|
---|
1232 | const bool noValidSplit = ((nObjectsLeft <= Limits::Small) || (nObjectsRight <= Limits::Small));
|
---|
1233 |
|
---|
1234 | // the heuristics
|
---|
1235 | const float sum = noValidSplit ?
|
---|
1236 | 1e25 : volLeft * (float)nObjectsLeft + volRight * (float)nObjectsRight;
|
---|
1237 |
|
---|
1238 | #ifdef GTP_DEBUG
|
---|
1239 | if (printStats)
|
---|
1240 | {
|
---|
1241 | PrintHeuristics(nObjectsRight, sum, volLeft, volRight, viewSpaceVol,
|
---|
1242 | sumStats, vollStats, volrStats);
|
---|
1243 | }
|
---|
1244 | #endif
|
---|
1245 |
|
---|
1246 | if (sum < newRenderCost)
|
---|
1247 | {
|
---|
1248 | newRenderCost = sum;
|
---|
1249 |
|
---|
1250 | volBack = volLeft;
|
---|
1251 | volFront = volRight;
|
---|
1252 |
|
---|
1253 | // objects belongs to left side now
|
---|
1254 | for (; backObjectsStart != (cit + 1); ++ backObjectsStart);
|
---|
1255 | }
|
---|
1256 | }
|
---|
1257 |
|
---|
1258 | ////////////////////////////////////////////
|
---|
1259 | //-- assign object to front and back volume
|
---|
1260 |
|
---|
1261 | // belongs to back bv
|
---|
1262 | for (cit = mSubdivisionCandidates->begin(); cit != backObjectsStart; ++ cit)
|
---|
1263 | {
|
---|
1264 | objectsBack.push_back((*cit).mObject);
|
---|
1265 | }
|
---|
1266 | // belongs to front bv
|
---|
1267 | for (cit = backObjectsStart; cit != cit_end; ++ cit)
|
---|
1268 | {
|
---|
1269 | objectsFront.push_back((*cit).mObject);
|
---|
1270 | }
|
---|
1271 |
|
---|
1272 | // render cost of the old parent
|
---|
1273 | const float oldRenderCost = (float)nTotalObjects * totalVol + Limits::Small;
|
---|
1274 | // the relative cost ratio
|
---|
1275 | const float ratio = newRenderCost / oldRenderCost;
|
---|
1276 |
|
---|
1277 | #ifdef GTP_DEBUG
|
---|
1278 | Debug << "\n§§§§ bvh eval const decrease §§§§" << endl
|
---|
1279 | << "back pvs: " << (int)objectsBack.size() << " front pvs: "
|
---|
1280 | << (int)objectsFront.size() << " total pvs: " << nTotalObjects << endl
|
---|
1281 | << "back p: " << volBack / viewSpaceVol << " front p "
|
---|
1282 | << volFront / viewSpaceVol << " p: " << totalVol / viewSpaceVol << endl
|
---|
1283 | << "old rc: " << oldRenderCost / viewSpaceVol << " new rc: "
|
---|
1284 | << newRenderCost / viewSpaceVol << endl
|
---|
1285 | << "render cost decrease: "
|
---|
1286 | << oldRenderCost / viewSpaceVol - newRenderCost / viewSpaceVol << endl;
|
---|
1287 | #endif
|
---|
1288 |
|
---|
1289 | return ratio;
|
---|
1290 | }
|
---|
1291 |
|
---|
1292 |
|
---|
1293 | void BvHierarchy::PrepareLocalSubdivisionCandidates(const BvhTraversalData &tData,
|
---|
1294 | const int axis)
|
---|
1295 | {
|
---|
1296 | //-- insert object queries
|
---|
1297 | ObjectContainer *objects = mUseGlobalSorting ?
|
---|
1298 | tData.mSortedObjects[axis] : &tData.mNode->mObjects;
|
---|
1299 |
|
---|
1300 | CreateLocalSubdivisionCandidates(*objects, &mSubdivisionCandidates, !mUseGlobalSorting, axis);
|
---|
1301 | }
|
---|
1302 |
|
---|
1303 |
|
---|
1304 | void BvHierarchy::CreateLocalSubdivisionCandidates(const ObjectContainer &objects,
|
---|
1305 | SortableEntryContainer **subdivisionCandidates,
|
---|
1306 | const bool sort,
|
---|
1307 | const int axis)
|
---|
1308 | {
|
---|
1309 | (*subdivisionCandidates)->clear();
|
---|
1310 |
|
---|
1311 | // compute requested size and look if subdivision candidate has to be recomputed
|
---|
1312 | const int requestedSize = (int)objects.size() * 2;
|
---|
1313 |
|
---|
1314 | // creates a sorted split candidates array
|
---|
1315 | if ((*subdivisionCandidates)->capacity() > 500000 &&
|
---|
1316 | requestedSize < (int)((*subdivisionCandidates)->capacity() / 10) )
|
---|
1317 | {
|
---|
1318 | delete (*subdivisionCandidates);
|
---|
1319 | (*subdivisionCandidates) = new SortableEntryContainer;
|
---|
1320 | }
|
---|
1321 |
|
---|
1322 | (*subdivisionCandidates)->reserve(requestedSize);
|
---|
1323 |
|
---|
1324 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
1325 |
|
---|
1326 | for (oit = objects.begin(); oit < oit_end; ++ oit)
|
---|
1327 | {
|
---|
1328 | Intersectable *object = *oit;
|
---|
1329 | const AxisAlignedBox3 &box = object->GetBox();
|
---|
1330 | const float midPt = (box.Min(axis) + box.Max(axis)) * 0.5f;
|
---|
1331 |
|
---|
1332 | (*subdivisionCandidates)->push_back(SortableEntry(object, midPt));
|
---|
1333 | }
|
---|
1334 |
|
---|
1335 | if (sort)
|
---|
1336 | { // no presorted candidate list
|
---|
1337 | stable_sort((*subdivisionCandidates)->begin(), (*subdivisionCandidates)->end());
|
---|
1338 | }
|
---|
1339 | }
|
---|
1340 |
|
---|
1341 |
|
---|
1342 | const BvhStatistics &BvHierarchy::GetStatistics() const
|
---|
1343 | {
|
---|
1344 | return mBvhStats;
|
---|
1345 | }
|
---|
1346 |
|
---|
1347 |
|
---|
1348 | float BvHierarchy::PrepareHeuristics(const BvhTraversalData &tData,
|
---|
1349 | const int axis)
|
---|
1350 | {
|
---|
1351 | BvhLeaf *leaf = tData.mNode;
|
---|
1352 | float vol = 0;
|
---|
1353 |
|
---|
1354 | // sort so we can use a sweep from right to left
|
---|
1355 | PrepareLocalSubdivisionCandidates(tData, axis);
|
---|
1356 |
|
---|
1357 | VssRayContainer rays;
|
---|
1358 | rays.reserve(tData.mNumRays);
|
---|
1359 | CollectRays(tData.mNode->mObjects, rays);
|
---|
1360 |
|
---|
1361 | const float prop = (float)mMaxTests / (float)tData.mNumRays;
|
---|
1362 |
|
---|
1363 | VssRay::NewMail();
|
---|
1364 |
|
---|
1365 | // only use a subset of the rays
|
---|
1366 | VssRayContainer::const_iterator rit, rit_end = rays.end();
|
---|
1367 |
|
---|
1368 | for (rit = rays.begin(); rit != rit_end; ++ rit)
|
---|
1369 | {
|
---|
1370 | if ((mMaxTests >= tData.mNumRays) || (Random(1.0f) < prop))
|
---|
1371 | {
|
---|
1372 | (*rit)->Mail();
|
---|
1373 | }
|
---|
1374 | }
|
---|
1375 |
|
---|
1376 | // collect and mark the view cells as belonging to front pvs
|
---|
1377 | ViewCellContainer viewCells;
|
---|
1378 | CollectViewCells(tData.mNode->mObjects, viewCells, true, true);
|
---|
1379 |
|
---|
1380 | ViewCellContainer::const_iterator vit, vit_end = viewCells.end();
|
---|
1381 | for (vit = viewCells.begin(); vit != vit_end; ++ vit)
|
---|
1382 | {
|
---|
1383 | #if USE_VOLUMES_FOR_HEURISTICS
|
---|
1384 | const float volIncr = (*vit)->GetVolume();
|
---|
1385 | #else
|
---|
1386 | const float volIncr = 1.0f;
|
---|
1387 | #endif
|
---|
1388 | vol += volIncr;
|
---|
1389 | }
|
---|
1390 |
|
---|
1391 | // we will mail view cells switching to the back side
|
---|
1392 | ViewCell::NewMail();
|
---|
1393 |
|
---|
1394 | return vol;
|
---|
1395 | }
|
---|
1396 |
|
---|
1397 | ///////////////////////////////////////////////////////////
|
---|
1398 |
|
---|
1399 |
|
---|
1400 | void BvHierarchy::EvalHeuristicsContribution(Intersectable *obj,
|
---|
1401 | float &volLeft,
|
---|
1402 | float &volRight)
|
---|
1403 | {
|
---|
1404 | // collect all view cells associated with this objects
|
---|
1405 | // (also multiple times, if they are pierced by several rays)
|
---|
1406 | ViewCellContainer viewCells;
|
---|
1407 | const bool useMailboxing = false;
|
---|
1408 |
|
---|
1409 | CollectViewCells(obj, viewCells, useMailboxing, true, true);
|
---|
1410 |
|
---|
1411 | // classify view cells and compute volume contri accordingly
|
---|
1412 | // possible view cell classifications:
|
---|
1413 | // view cell mailed => view cell can be seen from left child node
|
---|
1414 | // view cell counter > 0 view cell can be seen from right child node
|
---|
1415 | // combined: view cell volume belongs to both nodes
|
---|
1416 | ViewCellContainer::const_iterator vit, vit_end = viewCells.end();
|
---|
1417 |
|
---|
1418 | for (vit = viewCells.begin(); vit != vit_end; ++ vit)
|
---|
1419 | {
|
---|
1420 | // view cells can also be seen from left child node
|
---|
1421 | ViewCell *viewCell = *vit;
|
---|
1422 | #if USE_VOLUMES_FOR_HEURISTICS
|
---|
1423 | const float vol = viewCell->GetVolume();
|
---|
1424 | #else
|
---|
1425 | const float vol = 1.0f;
|
---|
1426 | #endif
|
---|
1427 | if (!viewCell->Mailed())
|
---|
1428 | {
|
---|
1429 | viewCell->Mail();
|
---|
1430 | // we now see view cell from both nodes
|
---|
1431 | // => add volume to left node
|
---|
1432 | volLeft += vol;
|
---|
1433 | }
|
---|
1434 |
|
---|
1435 | // last reference into the right node
|
---|
1436 | if (-- viewCell->mCounter == 0)
|
---|
1437 | {
|
---|
1438 | // view cell was previously seen from both nodes =>
|
---|
1439 | // remove volume from right node
|
---|
1440 | volRight -= vol;
|
---|
1441 | }
|
---|
1442 | }
|
---|
1443 | }
|
---|
1444 |
|
---|
1445 |
|
---|
1446 | void BvHierarchy::SetViewCellsManager(ViewCellsManager *vcm)
|
---|
1447 | {
|
---|
1448 | mViewCellsManager = vcm;
|
---|
1449 | }
|
---|
1450 |
|
---|
1451 |
|
---|
1452 | AxisAlignedBox3 BvHierarchy::GetBoundingBox() const
|
---|
1453 | {
|
---|
1454 | return mBoundingBox;
|
---|
1455 | }
|
---|
1456 |
|
---|
1457 |
|
---|
1458 | float BvHierarchy::SelectObjectPartition(const BvhTraversalData &tData,
|
---|
1459 | ObjectContainer &frontObjects,
|
---|
1460 | ObjectContainer &backObjects,
|
---|
1461 | bool useVisibilityBasedHeuristics)
|
---|
1462 | {
|
---|
1463 | ObjectContainer nFrontObjects[3];
|
---|
1464 | ObjectContainer nBackObjects[3];
|
---|
1465 | float nCostRatio[3];
|
---|
1466 |
|
---|
1467 | int sAxis = 0;
|
---|
1468 | int bestAxis = -1;
|
---|
1469 |
|
---|
1470 | if (mOnlyDrivingAxis)
|
---|
1471 | {
|
---|
1472 | const AxisAlignedBox3 box = tData.mNode->GetBoundingBox();
|
---|
1473 | sAxis = box.Size().DrivingAxis();
|
---|
1474 | }
|
---|
1475 |
|
---|
1476 | ////////////////////////////////////
|
---|
1477 | //-- evaluate split cost for all three axis
|
---|
1478 |
|
---|
1479 | for (int axis = 0; axis < 3; ++ axis)
|
---|
1480 | {
|
---|
1481 | if (!mOnlyDrivingAxis || (axis == sAxis))
|
---|
1482 | {
|
---|
1483 | if (mUseCostHeuristics)
|
---|
1484 | {
|
---|
1485 | //////////////////////////////////
|
---|
1486 | //-- split objects using heuristics
|
---|
1487 |
|
---|
1488 | if (useVisibilityBasedHeuristics)
|
---|
1489 | {
|
---|
1490 | //cout << "v rays: " << tData.mNumRays << " " << endl;
|
---|
1491 | ///////////
|
---|
1492 | //-- heuristics using objects weighted by view cells volume
|
---|
1493 | nCostRatio[axis] =
|
---|
1494 | EvalLocalCostHeuristics(tData,
|
---|
1495 | axis,
|
---|
1496 | nFrontObjects[axis],
|
---|
1497 | nBackObjects[axis]);
|
---|
1498 | }
|
---|
1499 | else
|
---|
1500 | { //cout << "e rays: " << tData.mNumRays << " ";
|
---|
1501 | //////////////////
|
---|
1502 | //-- view cells not constructed yet => use surface area heuristic
|
---|
1503 | nCostRatio[axis] = EvalSah(tData,
|
---|
1504 | axis,
|
---|
1505 | nFrontObjects[axis],
|
---|
1506 | nBackObjects[axis]);
|
---|
1507 | }
|
---|
1508 | }
|
---|
1509 | else
|
---|
1510 | {
|
---|
1511 | //-- split objects using some simple criteria
|
---|
1512 | nCostRatio[axis] =
|
---|
1513 | EvalLocalObjectPartition(tData, axis, nFrontObjects[axis], nBackObjects[axis]);
|
---|
1514 | }
|
---|
1515 |
|
---|
1516 | if ((bestAxis == -1) || (nCostRatio[axis] < nCostRatio[bestAxis]))
|
---|
1517 | {
|
---|
1518 | bestAxis = axis;
|
---|
1519 | }
|
---|
1520 | }
|
---|
1521 | }
|
---|
1522 |
|
---|
1523 | ////////////////
|
---|
1524 | //-- assign values
|
---|
1525 |
|
---|
1526 | frontObjects = nFrontObjects[bestAxis];
|
---|
1527 | backObjects = nBackObjects[bestAxis];
|
---|
1528 |
|
---|
1529 | //cout << "val: " << nCostRatio[bestAxis] << " axis: " << bestAxis << endl;
|
---|
1530 | return nCostRatio[bestAxis];
|
---|
1531 | }
|
---|
1532 |
|
---|
1533 |
|
---|
1534 | int BvHierarchy::AssociateObjectsWithRays(const VssRayContainer &rays) const
|
---|
1535 | {
|
---|
1536 | int nRays = 0;
|
---|
1537 | VssRayContainer::const_iterator rit, rit_end = rays.end();
|
---|
1538 |
|
---|
1539 | VssRay::NewMail();
|
---|
1540 |
|
---|
1541 | for (rit = rays.begin(); rit != rays.end(); ++ rit)
|
---|
1542 | {
|
---|
1543 | VssRay *ray = (*rit);
|
---|
1544 |
|
---|
1545 | if (ray->mTerminationObject)
|
---|
1546 | {
|
---|
1547 | ray->mTerminationObject->GetOrCreateRays()->push_back(ray);
|
---|
1548 | if (!ray->Mailed())
|
---|
1549 | {
|
---|
1550 | ray->Mail();
|
---|
1551 | ++ nRays;
|
---|
1552 | }
|
---|
1553 | }
|
---|
1554 | #if COUNT_ORIGIN_OBJECTS
|
---|
1555 | if (ray->mOriginObject)
|
---|
1556 | {
|
---|
1557 | ray->mOriginObject->GetOrCreateRays()->push_back(ray);
|
---|
1558 |
|
---|
1559 | if (!ray->Mailed())
|
---|
1560 | {
|
---|
1561 | ray->Mail();
|
---|
1562 | ++ nRays;
|
---|
1563 | }
|
---|
1564 | }
|
---|
1565 | #endif
|
---|
1566 | }
|
---|
1567 |
|
---|
1568 | return nRays;
|
---|
1569 | }
|
---|
1570 |
|
---|
1571 |
|
---|
1572 | void BvHierarchy::PrintSubdivisionStats(const SubdivisionCandidate &sc)
|
---|
1573 | {
|
---|
1574 | const float costDecr = sc.GetRenderCostDecrease();
|
---|
1575 |
|
---|
1576 | mSubdivisionStats
|
---|
1577 | << "#Leaves\n" << mBvhStats.Leaves() << endl
|
---|
1578 | << "#RenderCostDecrease\n" << costDecr << endl
|
---|
1579 | << "#TotalRenderCost\n" << mTotalCost << endl
|
---|
1580 | << "#EntriesInPvs\n" << mPvsEntries << endl;
|
---|
1581 | }
|
---|
1582 |
|
---|
1583 |
|
---|
1584 | void BvHierarchy::CollectRays(const ObjectContainer &objects,
|
---|
1585 | VssRayContainer &rays) const
|
---|
1586 | {
|
---|
1587 | VssRay::NewMail();
|
---|
1588 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
1589 |
|
---|
1590 | // evaluate reverse pvs and view cell volume on left and right cell
|
---|
1591 | // note: should I take all leaf objects or rather the objects hit by rays?
|
---|
1592 | for (oit = objects.begin(); oit != oit_end; ++ oit)
|
---|
1593 | {
|
---|
1594 | Intersectable *obj = *oit;
|
---|
1595 | VssRayContainer::const_iterator rit, rit_end = obj->GetOrCreateRays()->end();
|
---|
1596 |
|
---|
1597 | for (rit = obj->GetOrCreateRays()->begin(); rit < rit_end; ++ rit)
|
---|
1598 | {
|
---|
1599 | VssRay *ray = (*rit);
|
---|
1600 |
|
---|
1601 | if (!ray->Mailed())
|
---|
1602 | {
|
---|
1603 | ray->Mail();
|
---|
1604 | rays.push_back(ray);
|
---|
1605 | }
|
---|
1606 | }
|
---|
1607 | }
|
---|
1608 | }
|
---|
1609 |
|
---|
1610 |
|
---|
1611 | float BvHierarchy::EvalAbsCost(const ObjectContainer &objects)// const
|
---|
1612 | {
|
---|
1613 | #if USE_BETTER_RENDERCOST_EST
|
---|
1614 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
1615 |
|
---|
1616 | for (oit = objects.begin(); oit != oit_end; ++ oit)
|
---|
1617 | {
|
---|
1618 | objRenderCost += ViewCellsManager::GetRendercost(*oit);
|
---|
1619 | }
|
---|
1620 | #else
|
---|
1621 | return (float)objects.size();
|
---|
1622 | #endif
|
---|
1623 | }
|
---|
1624 |
|
---|
1625 |
|
---|
1626 | float BvHierarchy::EvalSahCost(BvhLeaf *leaf)
|
---|
1627 | {
|
---|
1628 | ////////////////
|
---|
1629 | //-- surface area heuristics
|
---|
1630 | if (leaf->mObjects.empty())
|
---|
1631 | return 0.0f;
|
---|
1632 |
|
---|
1633 | const AxisAlignedBox3 box = GetBoundingBox(leaf);
|
---|
1634 | const float area = box.SurfaceArea();
|
---|
1635 | const float viewSpaceArea = mViewCellsManager->GetViewSpaceBox().SurfaceArea();
|
---|
1636 |
|
---|
1637 | return EvalAbsCost(leaf->mObjects) * area / viewSpaceArea;
|
---|
1638 | }
|
---|
1639 |
|
---|
1640 |
|
---|
1641 | float BvHierarchy::EvalRenderCost(const ObjectContainer &objects) const
|
---|
1642 | {
|
---|
1643 | ///////////////
|
---|
1644 | //-- render cost heuristics
|
---|
1645 |
|
---|
1646 | const float viewSpaceVol = mViewCellsManager->GetViewSpaceBox().GetVolume();
|
---|
1647 |
|
---|
1648 | // probability that view point lies in a view cell which sees this node
|
---|
1649 | const float p = EvalViewCellsVolume(objects) / viewSpaceVol;
|
---|
1650 | const float objRenderCost = EvalAbsCost(objects);
|
---|
1651 |
|
---|
1652 | return objRenderCost * p;
|
---|
1653 | }
|
---|
1654 |
|
---|
1655 |
|
---|
1656 | AxisAlignedBox3 BvHierarchy::EvalBoundingBox(const ObjectContainer &objects,
|
---|
1657 | const AxisAlignedBox3 *parentBox) const
|
---|
1658 | {
|
---|
1659 | // if there are no objects in this box, box size is set to parent box size.
|
---|
1660 | // Question: Invalidate box instead?
|
---|
1661 | if (parentBox && objects.empty())
|
---|
1662 | return *parentBox;
|
---|
1663 |
|
---|
1664 | AxisAlignedBox3 box;
|
---|
1665 | box.Initialize();
|
---|
1666 |
|
---|
1667 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
1668 |
|
---|
1669 | for (oit = objects.begin(); oit != oit_end; ++ oit)
|
---|
1670 | {
|
---|
1671 | Intersectable *obj = *oit;
|
---|
1672 | // grow bounding box to include all objects
|
---|
1673 | box.Include(obj->GetBox());
|
---|
1674 | }
|
---|
1675 |
|
---|
1676 | return box;
|
---|
1677 | }
|
---|
1678 |
|
---|
1679 |
|
---|
1680 | void BvHierarchy::CollectLeaves(BvhNode *root, vector<BvhLeaf *> &leaves) const
|
---|
1681 | {
|
---|
1682 | stack<BvhNode *> nodeStack;
|
---|
1683 | nodeStack.push(root);
|
---|
1684 |
|
---|
1685 | while (!nodeStack.empty())
|
---|
1686 | {
|
---|
1687 | BvhNode *node = nodeStack.top();
|
---|
1688 | nodeStack.pop();
|
---|
1689 |
|
---|
1690 | if (node->IsLeaf())
|
---|
1691 | {
|
---|
1692 | BvhLeaf *leaf = (BvhLeaf *)node;
|
---|
1693 | leaves.push_back(leaf);
|
---|
1694 | }
|
---|
1695 | else
|
---|
1696 | {
|
---|
1697 | BvhInterior *interior = (BvhInterior *)node;
|
---|
1698 |
|
---|
1699 | nodeStack.push(interior->GetBack());
|
---|
1700 | nodeStack.push(interior->GetFront());
|
---|
1701 | }
|
---|
1702 | }
|
---|
1703 | }
|
---|
1704 |
|
---|
1705 |
|
---|
1706 | AxisAlignedBox3 BvHierarchy::GetBoundingBox(BvhNode *node) const
|
---|
1707 | {
|
---|
1708 | return node->GetBoundingBox();
|
---|
1709 | }
|
---|
1710 |
|
---|
1711 |
|
---|
1712 | void BvHierarchy::CollectViewCells(const ObjectContainer &objects,
|
---|
1713 | ViewCellContainer &viewCells,
|
---|
1714 | const bool setCounter,
|
---|
1715 | const bool onlyMailedRays) const
|
---|
1716 | {
|
---|
1717 | ViewCell::NewMail();
|
---|
1718 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
1719 |
|
---|
1720 | // loop through all object and collect view cell pvs of this node
|
---|
1721 | for (oit = objects.begin(); oit != oit_end; ++ oit)
|
---|
1722 | {
|
---|
1723 | // always use only mailed objects
|
---|
1724 | CollectViewCells(*oit, viewCells, true, setCounter, onlyMailedRays);
|
---|
1725 | }
|
---|
1726 | }
|
---|
1727 |
|
---|
1728 |
|
---|
1729 | void BvHierarchy::CollectViewCells(Intersectable *obj,
|
---|
1730 | ViewCellContainer &viewCells,
|
---|
1731 | const bool useMailBoxing,
|
---|
1732 | const bool setCounter,
|
---|
1733 | const bool onlyMailedRays) const
|
---|
1734 | {
|
---|
1735 | VssRayContainer::const_iterator rit, rit_end = obj->GetOrCreateRays()->end();
|
---|
1736 |
|
---|
1737 | for (rit = obj->GetOrCreateRays()->begin(); rit < rit_end; ++ rit)
|
---|
1738 | {
|
---|
1739 | VssRay *ray = (*rit);
|
---|
1740 |
|
---|
1741 | if (onlyMailedRays && !ray->Mailed())
|
---|
1742 | continue;
|
---|
1743 |
|
---|
1744 | ray->Mail();
|
---|
1745 |
|
---|
1746 | ViewCellContainer tmpViewCells;
|
---|
1747 | mHierarchyManager->mVspTree->GetViewCells(*ray, tmpViewCells);
|
---|
1748 |
|
---|
1749 | // matt: probably slow to allocate memory for view cells every time
|
---|
1750 | ViewCellContainer::const_iterator vit, vit_end = tmpViewCells.end();
|
---|
1751 |
|
---|
1752 | for (vit = tmpViewCells.begin(); vit != vit_end; ++ vit)
|
---|
1753 | {
|
---|
1754 | ViewCell *vc = *vit;
|
---|
1755 |
|
---|
1756 | // store view cells
|
---|
1757 | if (!useMailBoxing || !vc->Mailed())
|
---|
1758 | {
|
---|
1759 | if (useMailBoxing)
|
---|
1760 | {
|
---|
1761 | vc->Mail();
|
---|
1762 | if (setCounter)
|
---|
1763 | {
|
---|
1764 | vc->mCounter = 0;
|
---|
1765 | }
|
---|
1766 | }
|
---|
1767 | viewCells.push_back(vc);
|
---|
1768 | }
|
---|
1769 |
|
---|
1770 | if (setCounter)
|
---|
1771 | {
|
---|
1772 | ++ vc->mCounter;
|
---|
1773 | }
|
---|
1774 | }
|
---|
1775 | }
|
---|
1776 | }
|
---|
1777 |
|
---|
1778 |
|
---|
1779 | int BvHierarchy::CountViewCells(Intersectable *obj) const
|
---|
1780 | {
|
---|
1781 | int result = 0;
|
---|
1782 |
|
---|
1783 | VssRayContainer::const_iterator rit, rit_end = obj->GetOrCreateRays()->end();
|
---|
1784 |
|
---|
1785 | for (rit = obj->GetOrCreateRays()->begin(); rit < rit_end; ++ rit)
|
---|
1786 | {
|
---|
1787 | VssRay *ray = (*rit);
|
---|
1788 | ViewCellContainer tmpViewCells;
|
---|
1789 |
|
---|
1790 | mHierarchyManager->mVspTree->GetViewCells(*ray, tmpViewCells);
|
---|
1791 |
|
---|
1792 | ViewCellContainer::const_iterator vit, vit_end = tmpViewCells.end();
|
---|
1793 | for (vit = tmpViewCells.begin(); vit != vit_end; ++ vit)
|
---|
1794 | {
|
---|
1795 | ViewCell *vc = *vit;
|
---|
1796 |
|
---|
1797 | // store view cells
|
---|
1798 | if (!vc->Mailed())
|
---|
1799 | {
|
---|
1800 | vc->Mail();
|
---|
1801 | ++ result;
|
---|
1802 | }
|
---|
1803 | }
|
---|
1804 | }
|
---|
1805 |
|
---|
1806 | return result;
|
---|
1807 | }
|
---|
1808 |
|
---|
1809 |
|
---|
1810 | int BvHierarchy::CountViewCells(const ObjectContainer &objects) const
|
---|
1811 | {
|
---|
1812 | int nViewCells = 0;
|
---|
1813 | ViewCell::NewMail();
|
---|
1814 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
1815 |
|
---|
1816 | // loop through all object and collect view cell pvs of this node
|
---|
1817 | for (oit = objects.begin(); oit != oit_end; ++ oit)
|
---|
1818 | {
|
---|
1819 | nViewCells += CountViewCells(*oit);
|
---|
1820 | }
|
---|
1821 |
|
---|
1822 | return nViewCells;
|
---|
1823 | }
|
---|
1824 |
|
---|
1825 |
|
---|
1826 | void BvHierarchy::CollectDirtyCandidates(BvhSubdivisionCandidate *sc,
|
---|
1827 | vector<SubdivisionCandidate *> &dirtyList,
|
---|
1828 | const bool onlyUnmailed)
|
---|
1829 | {
|
---|
1830 | BvhTraversalData &tData = sc->mParentData;
|
---|
1831 | BvhLeaf *node = tData.mNode;
|
---|
1832 |
|
---|
1833 | ViewCellContainer viewCells;
|
---|
1834 | ViewCell::NewMail();
|
---|
1835 | CollectViewCells(node->mObjects, viewCells, true, false);
|
---|
1836 |
|
---|
1837 | if (0) cout << "collected " << (int)viewCells.size() << " dirty candidates" << endl;
|
---|
1838 |
|
---|
1839 | // split candidates handling
|
---|
1840 | // these view cells are thrown into dirty list
|
---|
1841 | ViewCellContainer::const_iterator vit, vit_end = viewCells.end();
|
---|
1842 |
|
---|
1843 | for (vit = viewCells.begin(); vit != vit_end; ++ vit)
|
---|
1844 | {
|
---|
1845 | VspViewCell *vc = dynamic_cast<VspViewCell *>(*vit);
|
---|
1846 | VspLeaf *leaf = vc->mLeaves[0];
|
---|
1847 |
|
---|
1848 | SubdivisionCandidate *candidate = leaf->GetSubdivisionCandidate();
|
---|
1849 |
|
---|
1850 | // is this leaf still a split candidate?
|
---|
1851 | if (candidate && (!onlyUnmailed || !candidate->Mailed()))
|
---|
1852 | {
|
---|
1853 | candidate->Mail();
|
---|
1854 | candidate->SetDirty(true);
|
---|
1855 | dirtyList.push_back(candidate);
|
---|
1856 | }
|
---|
1857 | }
|
---|
1858 | }
|
---|
1859 |
|
---|
1860 |
|
---|
1861 | BvhNode *BvHierarchy::GetRoot() const
|
---|
1862 | {
|
---|
1863 | return mRoot;
|
---|
1864 | }
|
---|
1865 |
|
---|
1866 |
|
---|
1867 | bool BvHierarchy::IsObjectInLeaf(BvhLeaf *leaf, Intersectable *object) const
|
---|
1868 | {
|
---|
1869 | ObjectContainer::const_iterator oit =
|
---|
1870 | lower_bound(leaf->mObjects.begin(), leaf->mObjects.end(), object, ilt);
|
---|
1871 |
|
---|
1872 | // objects sorted by id
|
---|
1873 | if ((oit != leaf->mObjects.end()) && ((*oit)->GetId() == object->GetId()))
|
---|
1874 | {
|
---|
1875 | return true;
|
---|
1876 | }
|
---|
1877 | else
|
---|
1878 | {
|
---|
1879 | return false;
|
---|
1880 | }
|
---|
1881 | }
|
---|
1882 |
|
---|
1883 |
|
---|
1884 | BvhLeaf *BvHierarchy::GetLeaf(Intersectable *object, BvhNode *node) const
|
---|
1885 | {
|
---|
1886 | // rather use the simple version
|
---|
1887 | if (!object)
|
---|
1888 | return NULL;
|
---|
1889 |
|
---|
1890 | return object->mBvhLeaf;
|
---|
1891 |
|
---|
1892 | ///////////////////////////////////////
|
---|
1893 | // start from root of tree
|
---|
1894 |
|
---|
1895 | if (node == NULL)
|
---|
1896 | node = mRoot;
|
---|
1897 |
|
---|
1898 | vector<BvhLeaf *> leaves;
|
---|
1899 |
|
---|
1900 | stack<BvhNode *> nodeStack;
|
---|
1901 | nodeStack.push(node);
|
---|
1902 |
|
---|
1903 | BvhLeaf *leaf = NULL;
|
---|
1904 |
|
---|
1905 | while (!nodeStack.empty())
|
---|
1906 | {
|
---|
1907 | BvhNode *node = nodeStack.top();
|
---|
1908 | nodeStack.pop();
|
---|
1909 |
|
---|
1910 | if (node->IsLeaf())
|
---|
1911 | {
|
---|
1912 | leaf = dynamic_cast<BvhLeaf *>(node);
|
---|
1913 |
|
---|
1914 | if (IsObjectInLeaf(leaf, object))
|
---|
1915 | {
|
---|
1916 | return leaf;
|
---|
1917 | }
|
---|
1918 | }
|
---|
1919 | else
|
---|
1920 | {
|
---|
1921 | // find point
|
---|
1922 | BvhInterior *interior = dynamic_cast<BvhInterior *>(node);
|
---|
1923 |
|
---|
1924 | if (interior->GetBack()->GetBoundingBox().Includes(object->GetBox()))
|
---|
1925 | {
|
---|
1926 | nodeStack.push(interior->GetBack());
|
---|
1927 | }
|
---|
1928 |
|
---|
1929 | // search both sides as we are using bounding volumes
|
---|
1930 | if (interior->GetFront()->GetBoundingBox().Includes(object->GetBox()))
|
---|
1931 | {
|
---|
1932 | nodeStack.push(interior->GetFront());
|
---|
1933 | }
|
---|
1934 | }
|
---|
1935 | }
|
---|
1936 |
|
---|
1937 | return leaf;
|
---|
1938 | }
|
---|
1939 |
|
---|
1940 |
|
---|
1941 | BvhIntersectable *BvHierarchy::GetOrCreateBvhIntersectable(BvhLeaf *node)
|
---|
1942 | {
|
---|
1943 | // search nodes
|
---|
1944 | std::map<BvhLeaf *, BvhIntersectable *>::const_iterator
|
---|
1945 | it = mBvhIntersectables.find(node);
|
---|
1946 |
|
---|
1947 | if (it != mBvhIntersectables.end())
|
---|
1948 | {
|
---|
1949 | return (*it).second;
|
---|
1950 | }
|
---|
1951 |
|
---|
1952 | // not in map => create new entry
|
---|
1953 | BvhIntersectable *bvhObj = new BvhIntersectable(node);
|
---|
1954 | mBvhIntersectables[node] = bvhObj;
|
---|
1955 |
|
---|
1956 | return bvhObj;
|
---|
1957 | }
|
---|
1958 |
|
---|
1959 |
|
---|
1960 | bool BvHierarchy::Export(OUT_STREAM &stream)
|
---|
1961 | {
|
---|
1962 | ExportNode(mRoot, stream);
|
---|
1963 |
|
---|
1964 | return true;
|
---|
1965 | }
|
---|
1966 |
|
---|
1967 |
|
---|
1968 | void BvHierarchy::ExportObjects(BvhLeaf *leaf, OUT_STREAM &stream)
|
---|
1969 | {
|
---|
1970 | ObjectContainer::const_iterator oit, oit_end = leaf->mObjects.end();
|
---|
1971 | for (oit = leaf->mObjects.begin(); oit != oit_end; ++ oit)
|
---|
1972 | {
|
---|
1973 | stream << (*oit)->GetId() << " ";
|
---|
1974 | }
|
---|
1975 | }
|
---|
1976 |
|
---|
1977 |
|
---|
1978 | void BvHierarchy::ExportNode(BvhNode *node, OUT_STREAM &stream)
|
---|
1979 | {
|
---|
1980 | if (node->IsLeaf())
|
---|
1981 | {
|
---|
1982 | BvhLeaf *leaf = dynamic_cast<BvhLeaf *>(node);
|
---|
1983 | const AxisAlignedBox3 box = leaf->GetBoundingBox();
|
---|
1984 | stream << "<Leaf"
|
---|
1985 | << " min=\"" << box.Min().x << " " << box.Min().y << " " << box.Min().z << "\""
|
---|
1986 | << " max=\"" << box.Max().x << " " << box.Max().y << " " << box.Max().z << "\""
|
---|
1987 | << " objects=\"";
|
---|
1988 |
|
---|
1989 | //-- export objects
|
---|
1990 | ExportObjects(leaf, stream);
|
---|
1991 |
|
---|
1992 | stream << "\" />" << endl;
|
---|
1993 | }
|
---|
1994 | else
|
---|
1995 | {
|
---|
1996 | BvhInterior *interior = dynamic_cast<BvhInterior *>(node);
|
---|
1997 | const AxisAlignedBox3 box = interior->GetBoundingBox();
|
---|
1998 |
|
---|
1999 | stream << "<Interior"
|
---|
2000 | << " min=\"" << box.Min().x << " " << box.Min().y << " " << box.Min().z << "\""
|
---|
2001 | << " max=\"" << box.Max().x << " " << box.Max().y << " " << box.Max().z
|
---|
2002 | << "\">" << endl;
|
---|
2003 |
|
---|
2004 | ExportNode(interior->GetBack(), stream);
|
---|
2005 | ExportNode(interior->GetFront(), stream);
|
---|
2006 |
|
---|
2007 | stream << "</Interior>" << endl;
|
---|
2008 | }
|
---|
2009 | }
|
---|
2010 |
|
---|
2011 |
|
---|
2012 | float BvHierarchy::EvalViewCellsVolume(const ObjectContainer &objects) const
|
---|
2013 | {
|
---|
2014 | float vol = 0;
|
---|
2015 |
|
---|
2016 | ViewCellContainer viewCells;
|
---|
2017 | // here we have to account for all view cells that can
|
---|
2018 | // be seen from the objects
|
---|
2019 | CollectViewCells(objects, viewCells, false, false);
|
---|
2020 |
|
---|
2021 | ViewCellContainer::const_iterator vit, vit_end = viewCells.end();
|
---|
2022 |
|
---|
2023 | for (vit = viewCells.begin(); vit != vit_end; ++ vit)
|
---|
2024 | {
|
---|
2025 | vol += (*vit)->GetVolume();
|
---|
2026 | }
|
---|
2027 |
|
---|
2028 | return vol;
|
---|
2029 | }
|
---|
2030 |
|
---|
2031 |
|
---|
2032 | void BvHierarchy::Initialise(const ObjectContainer &objects)
|
---|
2033 | {
|
---|
2034 | AxisAlignedBox3 box = EvalBoundingBox(objects);
|
---|
2035 |
|
---|
2036 | ///////
|
---|
2037 | //-- create new root
|
---|
2038 |
|
---|
2039 | BvhLeaf *bvhleaf = new BvhLeaf(box, NULL, (int)objects.size());
|
---|
2040 | bvhleaf->mObjects = objects;
|
---|
2041 | mRoot = bvhleaf;
|
---|
2042 |
|
---|
2043 | // compute bounding box from objects
|
---|
2044 | mBoundingBox = mRoot->GetBoundingBox();
|
---|
2045 |
|
---|
2046 | // associate root with current objects
|
---|
2047 | AssociateObjectsWithLeaf(bvhleaf);
|
---|
2048 | }
|
---|
2049 |
|
---|
2050 |
|
---|
2051 | /*
|
---|
2052 | Mesh *BvHierarchy::MergeLeafToMesh()
|
---|
2053 | {
|
---|
2054 | vector<BvhLeaf *> leaves;
|
---|
2055 | CollectLeaves(leaves);
|
---|
2056 |
|
---|
2057 | vector<BvhLeaf *>::const_iterator lit, lit_end = leaves.end();
|
---|
2058 |
|
---|
2059 | for (lit = leaves.begin(); lit != lit_end; ++ lit)
|
---|
2060 | {
|
---|
2061 | Mesh *mesh = MergeLeafToMesh(*lit);
|
---|
2062 | }
|
---|
2063 | }*/
|
---|
2064 |
|
---|
2065 |
|
---|
2066 | SubdivisionCandidate *BvHierarchy::PrepareConstruction(const VssRayContainer &sampleRays,
|
---|
2067 | const ObjectContainer &objects)
|
---|
2068 | {
|
---|
2069 | ///////////////////////////////////////
|
---|
2070 | //-- we assume that we have objects sorted by their id =>
|
---|
2071 | //-- we don't have to sort them here and an binary search
|
---|
2072 | //-- for identifying if a object is in a leaf.
|
---|
2073 |
|
---|
2074 | mBvhStats.Reset();
|
---|
2075 | mBvhStats.Start();
|
---|
2076 | mBvhStats.nodes = 1;
|
---|
2077 |
|
---|
2078 | // store pointer to this tree
|
---|
2079 | BvhSubdivisionCandidate::sBvHierarchy = this;
|
---|
2080 |
|
---|
2081 | // root and bounding box was already constructed
|
---|
2082 | BvhLeaf *bvhLeaf = dynamic_cast<BvhLeaf *>(mRoot);
|
---|
2083 |
|
---|
2084 | // multiply termination criterium for comparison,
|
---|
2085 | // so it can be set between zero and one and
|
---|
2086 | // no division is necessary during traversal
|
---|
2087 |
|
---|
2088 | #if PROBABILIY_IS_BV_VOLUME
|
---|
2089 | mTermMinProbability *= mBoundingBox.GetVolume();
|
---|
2090 | // probability that bounding volume is seen
|
---|
2091 | const float prop = GetBoundingBox().GetVolume();
|
---|
2092 | #else
|
---|
2093 | mTermMinProbability *= mVspTree->GetBoundingBox().GetVolume();
|
---|
2094 | // probability that volume is "seen" from the view cells
|
---|
2095 | const float prop = EvalViewCellsVolume(objects);
|
---|
2096 | #endif
|
---|
2097 |
|
---|
2098 | // only rays intersecting objects in node are interesting
|
---|
2099 | const int nRays = AssociateObjectsWithRays(sampleRays);
|
---|
2100 | //Debug << "using " << nRays << " of " << (int)sampleRays.size() << " rays" << endl;
|
---|
2101 |
|
---|
2102 | // create bvh traversal data
|
---|
2103 | BvhTraversalData oData(bvhLeaf, 0, prop, nRays);
|
---|
2104 |
|
---|
2105 | // create sorted object lists for the first data
|
---|
2106 | if (mUseGlobalSorting)
|
---|
2107 | {
|
---|
2108 | AssignInitialSortedObjectList(oData);
|
---|
2109 | }
|
---|
2110 |
|
---|
2111 |
|
---|
2112 | ///////////////////
|
---|
2113 | //-- add first candidate for object space partition
|
---|
2114 |
|
---|
2115 | BvhSubdivisionCandidate *oSubdivisionCandidate = new BvhSubdivisionCandidate(oData);
|
---|
2116 |
|
---|
2117 | // evaluate priority
|
---|
2118 | EvalSubdivisionCandidate(*oSubdivisionCandidate);
|
---|
2119 | bvhLeaf->SetSubdivisionCandidate(oSubdivisionCandidate);
|
---|
2120 |
|
---|
2121 | mTotalCost = EvalRenderCost(objects);
|
---|
2122 | mPvsEntries = CountViewCells(objects);
|
---|
2123 |
|
---|
2124 | PrintSubdivisionStats(*oSubdivisionCandidate);
|
---|
2125 |
|
---|
2126 | return oSubdivisionCandidate;
|
---|
2127 | }
|
---|
2128 |
|
---|
2129 |
|
---|
2130 | void BvHierarchy::AssignInitialSortedObjectList(BvhTraversalData &tData)
|
---|
2131 | {
|
---|
2132 | // we sort the objects as a preprocess so they don't have
|
---|
2133 | // to be sorted for each split
|
---|
2134 | for (int i = 0; i < 3; ++ i)
|
---|
2135 | {
|
---|
2136 | // create new objects
|
---|
2137 | if (!mSortedObjects[i])
|
---|
2138 | {
|
---|
2139 | mSortedObjects[i] = new SortableEntryContainer();
|
---|
2140 | CreateLocalSubdivisionCandidates(tData.mNode->mObjects, &mSortedObjects[i], true, i);
|
---|
2141 | }
|
---|
2142 |
|
---|
2143 | // copy list into traversal data list
|
---|
2144 | tData.mSortedObjects[i] = new ObjectContainer();
|
---|
2145 | tData.mSortedObjects[i]->reserve((int)mSortedObjects[i]->size());
|
---|
2146 |
|
---|
2147 | SortableEntryContainer::const_iterator oit, oit_end = mSortedObjects[i]->end();
|
---|
2148 |
|
---|
2149 | for (oit = mSortedObjects[i]->begin(); oit != oit_end; ++ oit)
|
---|
2150 | {
|
---|
2151 | tData.mSortedObjects[i]->push_back((*oit).mObject);
|
---|
2152 | }
|
---|
2153 | }
|
---|
2154 | }
|
---|
2155 |
|
---|
2156 |
|
---|
2157 | void BvHierarchy::AssignSortedObjects(const BvhSubdivisionCandidate &sc,
|
---|
2158 | BvhTraversalData &frontData,
|
---|
2159 | BvhTraversalData &backData)
|
---|
2160 | {
|
---|
2161 | Intersectable::NewMail();
|
---|
2162 |
|
---|
2163 | // we sorted the objects as a preprocess so they don't have
|
---|
2164 | // to be sorted for each split
|
---|
2165 | ObjectContainer::const_iterator fit, fit_end = sc.mFrontObjects.end();
|
---|
2166 |
|
---|
2167 | for (fit = sc.mFrontObjects.begin(); fit != fit_end; ++ fit)
|
---|
2168 | {
|
---|
2169 | (*fit)->Mail();
|
---|
2170 | }
|
---|
2171 |
|
---|
2172 | for (int i = 0; i < 3; ++ i)
|
---|
2173 | {
|
---|
2174 | frontData.mSortedObjects[i] = new ObjectContainer();
|
---|
2175 | backData.mSortedObjects[i] = new ObjectContainer();
|
---|
2176 |
|
---|
2177 | frontData.mSortedObjects[i]->reserve((int)sc.mFrontObjects.size());
|
---|
2178 | backData.mSortedObjects[i]->reserve((int)sc.mFrontObjects.size());
|
---|
2179 |
|
---|
2180 | ObjectContainer::const_iterator oit, oit_end = sc.mParentData.mSortedObjects[i]->end();
|
---|
2181 |
|
---|
2182 | for (oit = sc.mParentData.mSortedObjects[i]->begin(); oit != oit_end; ++ oit)
|
---|
2183 | {
|
---|
2184 | if ((*oit)->Mailed())
|
---|
2185 | {
|
---|
2186 | frontData.mSortedObjects[i]->push_back(*oit);
|
---|
2187 | }
|
---|
2188 | else
|
---|
2189 | {
|
---|
2190 | backData.mSortedObjects[i]->push_back(*oit);
|
---|
2191 | }
|
---|
2192 | }
|
---|
2193 | }
|
---|
2194 | }
|
---|
2195 |
|
---|
2196 |
|
---|
2197 | SubdivisionCandidate *BvHierarchy::Reset(const VssRayContainer &sampleRays,
|
---|
2198 | const ObjectContainer &objects)
|
---|
2199 | {
|
---|
2200 | // reset stats
|
---|
2201 | mBvhStats.Reset();
|
---|
2202 | mBvhStats.Start();
|
---|
2203 | mBvhStats.nodes = 1;
|
---|
2204 |
|
---|
2205 | // reset root
|
---|
2206 | DEL_PTR(mRoot);
|
---|
2207 |
|
---|
2208 | BvhLeaf *bvhleaf = new BvhLeaf(mBoundingBox, NULL, (int)objects.size());
|
---|
2209 | bvhleaf->mObjects = objects;
|
---|
2210 | mRoot = bvhleaf;
|
---|
2211 |
|
---|
2212 | #if PROBABILIY_IS_BV_VOLUME
|
---|
2213 | mTermMinProbability *= mBoundingBox.GetVolume();
|
---|
2214 | // probability that bounding volume is seen
|
---|
2215 | const float prop = GetBoundingBox().GetVolume();
|
---|
2216 | #else
|
---|
2217 | mTermMinProbability *= mVspTree->GetBoundingBox().GetVolume();
|
---|
2218 | // probability that volume is "seen" from the view cells
|
---|
2219 | const float prop = EvalViewCellsVolume(objects);
|
---|
2220 | #endif
|
---|
2221 |
|
---|
2222 | const int nRays = CountRays(objects);
|
---|
2223 | BvhLeaf *bvhLeaf = dynamic_cast<BvhLeaf *>(mRoot);
|
---|
2224 |
|
---|
2225 | // create bvh traversal data
|
---|
2226 | BvhTraversalData oData(bvhLeaf, 0, prop, nRays);
|
---|
2227 |
|
---|
2228 | AssignInitialSortedObjectList(oData);
|
---|
2229 |
|
---|
2230 |
|
---|
2231 | ///////////////////
|
---|
2232 | //-- add first candidate for object space partition
|
---|
2233 |
|
---|
2234 | BvhSubdivisionCandidate *oSubdivisionCandidate =
|
---|
2235 | new BvhSubdivisionCandidate(oData);
|
---|
2236 |
|
---|
2237 | EvalSubdivisionCandidate(*oSubdivisionCandidate);
|
---|
2238 | bvhLeaf->SetSubdivisionCandidate(oSubdivisionCandidate);
|
---|
2239 |
|
---|
2240 | const float viewSpaceVol = mViewCellsManager->GetViewSpaceBox().GetVolume();
|
---|
2241 | mTotalCost = (float)objects.size() * prop / viewSpaceVol;
|
---|
2242 |
|
---|
2243 | PrintSubdivisionStats(*oSubdivisionCandidate);
|
---|
2244 |
|
---|
2245 | return oSubdivisionCandidate;
|
---|
2246 | }
|
---|
2247 |
|
---|
2248 |
|
---|
2249 | void BvhStatistics::Print(ostream &app) const
|
---|
2250 | {
|
---|
2251 | app << "=========== BvHierarchy statistics ===============\n";
|
---|
2252 |
|
---|
2253 | app << setprecision(4);
|
---|
2254 |
|
---|
2255 | app << "#N_CTIME ( Construction time [s] )\n" << Time() << " \n";
|
---|
2256 |
|
---|
2257 | app << "#N_NODES ( Number of nodes )\n" << nodes << "\n";
|
---|
2258 |
|
---|
2259 | app << "#N_INTERIORS ( Number of interior nodes )\n" << Interior() << "\n";
|
---|
2260 |
|
---|
2261 | app << "#N_LEAVES ( Number of leaves )\n" << Leaves() << "\n";
|
---|
2262 |
|
---|
2263 | app << "#AXIS_ALIGNED_SPLITS (number of axis aligned splits)\n" << splits << endl;
|
---|
2264 |
|
---|
2265 | app << "#N_MAXCOSTNODES ( Percentage of leaves with terminated because of max cost ratio )\n"
|
---|
2266 | << maxCostNodes * 100 / (double)Leaves() << endl;
|
---|
2267 |
|
---|
2268 | app << "#N_PMINPROBABILITYLEAVES ( Percentage of leaves with mininum probability )\n"
|
---|
2269 | << minProbabilityNodes * 100 / (double)Leaves() << endl;
|
---|
2270 |
|
---|
2271 |
|
---|
2272 | //////////////////////////////////////////////////
|
---|
2273 |
|
---|
2274 | app << "#N_PMAXDEPTHLEAVES ( Percentage of leaves at maximum depth )\n"
|
---|
2275 | << maxDepthNodes * 100 / (double)Leaves() << endl;
|
---|
2276 |
|
---|
2277 | app << "#N_PMAXDEPTH ( Maximal reached depth )\n" << maxDepth << endl;
|
---|
2278 |
|
---|
2279 | app << "#N_PMINDEPTH ( Minimal reached depth )\n" << minDepth << endl;
|
---|
2280 |
|
---|
2281 | app << "#AVGDEPTH ( average depth )\n" << AvgDepth() << endl;
|
---|
2282 |
|
---|
2283 |
|
---|
2284 | ////////////////////////////////////////////////////////
|
---|
2285 |
|
---|
2286 | app << "#N_PMINOBJECTSLEAVES ( Percentage of leaves with mininum objects )\n"
|
---|
2287 | << minObjectsNodes * 100 / (double)Leaves() << endl;
|
---|
2288 |
|
---|
2289 | app << "#N_MAXOBJECTREFS ( Max number of object refs / leaf )\n" << maxObjectRefs << "\n";
|
---|
2290 |
|
---|
2291 | app << "#N_MINOBJECTREFS ( Min number of object refs / leaf )\n" << minObjectRefs << "\n";
|
---|
2292 |
|
---|
2293 | app << "#N_EMPTYLEAFS ( Empty leafs )\n" << emptyNodes << "\n";
|
---|
2294 |
|
---|
2295 | app << "#N_PAVGOBJECTSLEAVES ( average object refs / leaf)\n" << AvgObjectRefs() << endl;
|
---|
2296 |
|
---|
2297 |
|
---|
2298 | ////////////////////////////////////////////////////////
|
---|
2299 |
|
---|
2300 | app << "#N_PMINRAYSLEAVES ( Percentage of leaves with mininum rays )\n"
|
---|
2301 | << minRaysNodes * 100 / (double)Leaves() << endl;
|
---|
2302 |
|
---|
2303 | app << "#N_MAXRAYREFS ( Max number of ray refs / leaf )\n" << maxRayRefs << "\n";
|
---|
2304 |
|
---|
2305 | app << "#N_MINRAYREFS ( Min number of ray refs / leaf )\n" << minRayRefs << "\n";
|
---|
2306 |
|
---|
2307 | app << "#N_PAVGRAYLEAVES ( average ray refs / leaf )\n" << AvgRayRefs() << endl;
|
---|
2308 |
|
---|
2309 | app << "#N_PAVGRAYCONTRIBLEAVES ( Average ray contribution)\n" <<
|
---|
2310 | rayRefs / (double)objectRefs << endl;
|
---|
2311 |
|
---|
2312 | app << "#N_PMAXRAYCONTRIBLEAVES ( Percentage of leaves with maximal ray contribution )\n"<<
|
---|
2313 | maxRayContriNodes * 100 / (double)Leaves() << endl;
|
---|
2314 |
|
---|
2315 | app << "#N_PGLOBALCOSTMISSES ( Global cost misses )\n" << mGlobalCostMisses << endl;
|
---|
2316 |
|
---|
2317 | app << "========== END OF BvHierarchy statistics ==========\n";
|
---|
2318 | }
|
---|
2319 |
|
---|
2320 |
|
---|
2321 | // TODO: return memory usage in MB
|
---|
2322 | float BvHierarchy::GetMemUsage() const
|
---|
2323 | {
|
---|
2324 | return (float)(sizeof(BvHierarchy)
|
---|
2325 | + mBvhStats.Leaves() * sizeof(BvhLeaf)
|
---|
2326 | + mBvhStats.Interior() * sizeof(BvhInterior)
|
---|
2327 | ) / float(1024 * 1024);
|
---|
2328 | }
|
---|
2329 |
|
---|
2330 |
|
---|
2331 | void BvHierarchy::SetActive(BvhNode *node) const
|
---|
2332 | {
|
---|
2333 | vector<BvhLeaf *> leaves;
|
---|
2334 |
|
---|
2335 | // sets the pointers to the currently active view cells
|
---|
2336 | CollectLeaves(node, leaves);
|
---|
2337 | vector<BvhLeaf *>::const_iterator lit, lit_end = leaves.end();
|
---|
2338 |
|
---|
2339 | for (lit = leaves.begin(); lit != lit_end; ++ lit)
|
---|
2340 | {
|
---|
2341 | (*lit)->SetActiveNode(node);
|
---|
2342 | }
|
---|
2343 | }
|
---|
2344 |
|
---|
2345 |
|
---|
2346 | BvhNode *BvHierarchy::SubdivideAndCopy(SplitQueue &tQueue,
|
---|
2347 | SubdivisionCandidate *splitCandidate)
|
---|
2348 | {
|
---|
2349 | BvhSubdivisionCandidate *sc =
|
---|
2350 | dynamic_cast<BvhSubdivisionCandidate *>(splitCandidate);
|
---|
2351 | BvhTraversalData &tData = sc->mParentData;
|
---|
2352 |
|
---|
2353 | BvhNode *currentNode = tData.mNode;
|
---|
2354 | BvhNode *oldNode = (BvhNode *)splitCandidate->mEvaluationHack;
|
---|
2355 |
|
---|
2356 | if (!oldNode->IsLeaf())
|
---|
2357 | {
|
---|
2358 | //////////////
|
---|
2359 | //-- continue subdivision
|
---|
2360 |
|
---|
2361 | BvhTraversalData tFrontData;
|
---|
2362 | BvhTraversalData tBackData;
|
---|
2363 |
|
---|
2364 | BvhInterior *oldInterior = dynamic_cast<BvhInterior *>(oldNode);
|
---|
2365 |
|
---|
2366 | sc->mFrontObjects.clear();
|
---|
2367 | sc->mBackObjects.clear();
|
---|
2368 |
|
---|
2369 | oldInterior->GetFront()->CollectObjects(sc->mFrontObjects);
|
---|
2370 | oldInterior->GetBack()->CollectObjects(sc->mBackObjects);
|
---|
2371 |
|
---|
2372 | // evaluate the changes in render cost and pvs entries
|
---|
2373 | EvalSubdivisionCandidate(*sc, false);
|
---|
2374 |
|
---|
2375 | // create new interior node and two leaf node
|
---|
2376 | currentNode = SubdivideNode(*sc, tFrontData, tBackData);
|
---|
2377 |
|
---|
2378 | //oldNode->mRenderCostDecr += sc->GetRenderCostDecrease();
|
---|
2379 | //oldNode->mPvsEntriesIncr += sc->GetPvsEntriesIncr();
|
---|
2380 |
|
---|
2381 | //oldNode->mRenderCostDecr = sc->GetRenderCostDecrease();
|
---|
2382 | //oldNode->mPvsEntriesIncr = sc->GetPvsEntriesIncr();
|
---|
2383 |
|
---|
2384 | ///////////////////////////
|
---|
2385 | //-- push the new split candidates on the queue
|
---|
2386 |
|
---|
2387 | BvhSubdivisionCandidate *frontCandidate = new BvhSubdivisionCandidate(tFrontData);
|
---|
2388 | BvhSubdivisionCandidate *backCandidate = new BvhSubdivisionCandidate(tBackData);
|
---|
2389 |
|
---|
2390 | frontCandidate->SetPriority((float)-oldInterior->GetFront()->mTimeStamp);
|
---|
2391 | backCandidate->SetPriority((float)-oldInterior->GetBack()->mTimeStamp);
|
---|
2392 |
|
---|
2393 | frontCandidate->mEvaluationHack = oldInterior->GetFront();
|
---|
2394 | backCandidate->mEvaluationHack = oldInterior->GetBack();
|
---|
2395 |
|
---|
2396 | // cross reference
|
---|
2397 | tFrontData.mNode->SetSubdivisionCandidate(frontCandidate);
|
---|
2398 | tBackData.mNode->SetSubdivisionCandidate(backCandidate);
|
---|
2399 |
|
---|
2400 | //cout << "f: " << frontCandidate->GetPriority() << " b: " << backCandidate->GetPriority() << endl;
|
---|
2401 | tQueue.Push(frontCandidate);
|
---|
2402 | tQueue.Push(backCandidate);
|
---|
2403 | }
|
---|
2404 |
|
---|
2405 | /////////////////////////////////
|
---|
2406 | //-- node is a leaf => terminate traversal
|
---|
2407 |
|
---|
2408 | if (currentNode->IsLeaf())
|
---|
2409 | {
|
---|
2410 | // this leaf is no candidate for splitting anymore
|
---|
2411 | // => detach subdivision candidate
|
---|
2412 | tData.mNode->SetSubdivisionCandidate(NULL);
|
---|
2413 | // detach node so we don't delete it with the traversal data
|
---|
2414 | tData.mNode = NULL;
|
---|
2415 | }
|
---|
2416 |
|
---|
2417 | return currentNode;
|
---|
2418 | }
|
---|
2419 |
|
---|
2420 |
|
---|
2421 | void BvHierarchy::CollectObjects(const AxisAlignedBox3 &box, ObjectContainer &objects)
|
---|
2422 | {
|
---|
2423 | stack<BvhNode *> nodeStack;
|
---|
2424 |
|
---|
2425 | nodeStack.push(mRoot);
|
---|
2426 |
|
---|
2427 | while (!nodeStack.empty())
|
---|
2428 | {
|
---|
2429 | BvhNode *node = nodeStack.top();
|
---|
2430 |
|
---|
2431 | nodeStack.pop();
|
---|
2432 |
|
---|
2433 | if (node->IsLeaf())
|
---|
2434 | {
|
---|
2435 | BvhLeaf *leaf = (BvhLeaf *)node;
|
---|
2436 |
|
---|
2437 | ObjectContainer::const_iterator oit, oit_end = leaf->mObjects.end();
|
---|
2438 |
|
---|
2439 | for (oit = leaf->mObjects.begin(); oit != oit_end; ++oit)
|
---|
2440 | {
|
---|
2441 | Intersectable *object = *oit;
|
---|
2442 | if (Overlap(box, object->GetBox()))
|
---|
2443 | {
|
---|
2444 | object->Mail();
|
---|
2445 | objects.push_back(object);
|
---|
2446 | }
|
---|
2447 | }
|
---|
2448 | }
|
---|
2449 | else
|
---|
2450 | {
|
---|
2451 | BvhInterior *interior = (BvhInterior *)node;
|
---|
2452 |
|
---|
2453 | if (Overlap(box, interior->GetBoundingBox()))
|
---|
2454 | nodeStack.push(interior->GetFront());
|
---|
2455 |
|
---|
2456 | if (Overlap(box, interior->GetBoundingBox()))
|
---|
2457 | nodeStack.push(interior->GetBack());
|
---|
2458 | }
|
---|
2459 | }
|
---|
2460 | }
|
---|
2461 |
|
---|
2462 | }
|
---|