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