1 | #include <stack>
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2 | #include <time.h>
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3 | #include <iomanip>
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4 |
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5 | #include "BvHierarchy.h"
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6 | #include "ViewCell.h"
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7 | #include "Plane3.h"
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8 | #include "Mesh.h"
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9 | #include "common.h"
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10 | #include "Environment.h"
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11 | #include "Polygon3.h"
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12 | #include "Ray.h"
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13 | #include "AxisAlignedBox3.h"
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14 | #include "Exporter.h"
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15 | #include "Plane3.h"
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16 | #include "ViewCellsManager.h"
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17 | #include "Beam.h"
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18 | #include "VspTree.h"
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19 | #include "HierarchyManager.h"
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20 |
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21 |
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22 | namespace GtpVisibilityPreprocessor {
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23 |
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24 |
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25 | #define PROBABILIY_IS_BV_VOLUME 1
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26 | #define USE_FIXEDPOINT_T 0
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27 | #define USE_VOLUMES_FOR_HEURISTICS 1
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28 |
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29 | //int BvhNode::sMailId = 10000; //2147483647;
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30 | //int BvhNode::sReservedMailboxes = 1;
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31 |
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32 | BvHierarchy *BvHierarchy::BvhSubdivisionCandidate::sBvHierarchy = NULL;
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33 |
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34 |
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35 | /// sorting operator
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36 | inline static bool ilt(Intersectable *obj1, Intersectable *obj2)
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37 | {
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38 | return obj1->mId < obj2->mId;
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39 | }
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40 |
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41 |
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42 | /***************************************************************/
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43 | /* class BvhNode implementation */
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44 | /***************************************************************/
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45 |
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46 | BvhNode::BvhNode():
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47 | mParent(NULL),
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48 | mTimeStamp(0)
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49 | {
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50 |
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51 | }
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52 |
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53 | BvhNode::BvhNode(const AxisAlignedBox3 &bbox):
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54 | mParent(NULL),
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55 | mBoundingBox(bbox),
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56 | mTimeStamp(0)
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57 | {
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58 | }
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59 |
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60 |
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61 | BvhNode::BvhNode(const AxisAlignedBox3 &bbox, BvhInterior *parent):
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62 | mBoundingBox(bbox),
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63 | mParent(parent),
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64 | mTimeStamp(0)
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65 | {
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66 | }
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67 |
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68 |
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69 | bool BvhNode::IsRoot() const
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70 | {
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71 | return mParent == NULL;
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72 | }
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73 |
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74 |
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75 | BvhInterior *BvhNode::GetParent()
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76 | {
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77 | return mParent;
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78 | }
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79 |
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80 |
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81 | void BvhNode::SetParent(BvhInterior *parent)
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82 | {
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83 | mParent = parent;
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84 | }
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85 |
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86 |
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87 | int BvhNode::GetRandomEdgePoint(Vector3 &point,
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88 | Vector3 &normal)
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89 | {
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90 | // get random edge
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91 | const int idx = Random(12);
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92 | Vector3 a, b;
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93 | mBoundingBox.GetEdge(idx, &a, &b);
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94 |
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95 | const float factor = RandomValue(0.0f, 1.0f);
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96 |
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97 | point = a * factor + b * (1 - factor);
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98 | //normal = mBoundingBox.GetNormal();
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99 |
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100 | return idx;
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101 | }
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102 |
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103 |
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104 | /******************************************************************/
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105 | /* class BvhInterior implementation */
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106 | /******************************************************************/
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107 |
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108 |
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109 | BvhLeaf::BvhLeaf(const AxisAlignedBox3 &bbox):
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110 | BvhNode(bbox),
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111 | mSubdivisionCandidate(NULL)
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112 | {
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113 | mActiveNode = this;
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114 | }
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115 |
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116 |
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117 | BvhLeaf::BvhLeaf(const AxisAlignedBox3 &bbox, BvhInterior *parent):
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118 | BvhNode(bbox, parent)
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119 | {
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120 | mActiveNode = this;
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121 | }
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122 |
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123 |
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124 | BvhLeaf::BvhLeaf(const AxisAlignedBox3 &bbox,
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125 | BvhInterior *parent,
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126 | const int numObjects):
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127 | BvhNode(bbox, parent)
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128 | {
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129 | mObjects.reserve(numObjects);
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130 | mActiveNode = this;
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131 | }
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132 |
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133 |
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134 | bool BvhLeaf::IsLeaf() const
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135 | {
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136 | return true;
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137 | }
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138 |
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139 |
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140 | BvhLeaf::~BvhLeaf()
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141 | {
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142 | }
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143 |
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144 |
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145 | void BvhLeaf::CollectObjects(ObjectContainer &objects)
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146 | {
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147 | ObjectContainer::const_iterator oit, oit_end = mObjects.end();
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148 | for (oit = mObjects.begin(); oit != oit_end; ++ oit)
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149 | {
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150 | objects.push_back(*oit);
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151 | }
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152 | }
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153 |
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154 | /******************************************************************/
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155 | /* class BvhInterior implementation */
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156 | /******************************************************************/
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157 |
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158 |
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159 | BvhInterior::BvhInterior(const AxisAlignedBox3 &bbox):
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160 | BvhNode(bbox), mFront(NULL), mBack(NULL)
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161 | {
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162 | }
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163 |
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164 |
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165 | BvhInterior::BvhInterior(const AxisAlignedBox3 &bbox, BvhInterior *parent):
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166 | BvhNode(bbox, parent), mFront(NULL), mBack(NULL)
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167 | {
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168 | }
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169 |
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170 |
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171 | void BvhInterior::ReplaceChildLink(BvhNode *oldChild, BvhNode *newChild)
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172 | {
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173 | if (mBack == oldChild)
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174 | mBack = newChild;
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175 | else
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176 | mFront = newChild;
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177 | }
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178 |
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179 |
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180 | bool BvhInterior::IsLeaf() const
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181 | {
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182 | return false;
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183 | }
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184 |
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185 |
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186 | BvhInterior::~BvhInterior()
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187 | {
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188 | DEL_PTR(mFront);
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189 | DEL_PTR(mBack);
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190 | }
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191 |
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192 |
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193 | void BvhInterior::SetupChildLinks(BvhNode *front, BvhNode *back)
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194 | {
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195 | mBack = back;
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196 | mFront = front;
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197 | }
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198 |
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199 |
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200 | void BvhInterior::CollectObjects(ObjectContainer &objects)
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201 | {
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202 | mFront->CollectObjects(objects);
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203 | mBack->CollectObjects(objects);
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204 | }
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205 |
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206 |
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207 | /*******************************************************************/
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208 | /* class BvHierarchy implementation */
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209 | /*******************************************************************/
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210 |
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211 |
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212 | BvHierarchy::BvHierarchy():
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213 | mRoot(NULL),
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214 | mTimeStamp(1)
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215 | {
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216 | ReadEnvironment();
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217 | mSubdivisionCandidates = new SortableEntryContainer;
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218 | for (int i = 0; i < 3; ++ i)
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219 | mSortedObjects[i] = NULL;
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220 | }
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221 |
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222 |
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223 | BvHierarchy::~BvHierarchy()
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224 | {
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225 | // delete the local subdivision candidates
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226 | DEL_PTR(mSubdivisionCandidates);
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227 |
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228 | // delete the presorted objects
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229 | for (int i = 0; i < 3; ++ i)
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230 | {
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231 | DEL_PTR(mSortedObjects[i]);
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232 | }
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233 |
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234 | // delete the tree
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235 | DEL_PTR(mRoot);
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236 | }
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237 |
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238 |
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239 | void BvHierarchy::ReadEnvironment()
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240 | {
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241 | bool randomize = false;
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242 | Environment::GetSingleton()->GetBoolValue("VspTree.Construction.randomize", randomize);
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243 |
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244 | // initialise random generator for heuristics
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245 | if (randomize)
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246 | Randomize();
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247 |
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248 | //////////////////////////////
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249 | //-- termination criteria for autopartition
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250 |
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251 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.maxDepth", mTermMaxDepth);
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252 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.maxLeaves", mTermMaxLeaves);
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253 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.minObjects", mTermMinObjects);
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254 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.minRays", mTermMinRays);
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255 | Environment::GetSingleton()->GetFloatValue(
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256 | "BvHierarchy.Termination.minProbability", mTermMinProbability);
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257 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.missTolerance", mTermMissTolerance);
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258 |
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259 |
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260 | //////////////////////////////
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261 | //-- max cost ratio for early tree termination
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262 |
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263 | Environment::GetSingleton()->GetFloatValue("BvHierarchy.Termination.maxCostRatio", mTermMaxCostRatio);
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264 | Environment::GetSingleton()->GetFloatValue("BvHierarchy.Termination.minGlobalCostRatio",
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265 | mTermMinGlobalCostRatio);
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266 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.globalCostMissTolerance",
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267 | mTermGlobalCostMissTolerance);
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268 |
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269 |
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270 | //////////////////////////////
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271 | //-- factors for subdivision heuristics
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272 |
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273 | // if only the driving axis is used for splits
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274 | Environment::GetSingleton()->GetBoolValue("BvHierarchy.splitUseOnlyDrivingAxis", mOnlyDrivingAxis);
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275 | Environment::GetSingleton()->GetFloatValue("BvHierarchy.maxStaticMemory", mMaxMemory);
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276 | Environment::GetSingleton()->GetBoolValue("BvHierarchy.useCostHeuristics", mUseCostHeuristics);
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277 | Environment::GetSingleton()->GetBoolValue("BvHierarchy.useSah", mUseSah);
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278 |
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279 | char subdivisionStatsLog[100];
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280 | Environment::GetSingleton()->GetStringValue("BvHierarchy.subdivisionStats", subdivisionStatsLog);
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281 | mSubdivisionStats.open(subdivisionStatsLog);
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282 |
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283 | Environment::GetSingleton()->GetFloatValue(
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284 | "BvHierarchy.Construction.renderCostDecreaseWeight", mRenderCostDecreaseWeight);
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285 | Environment::GetSingleton()->GetBoolValue(
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286 | "BvHierarchy.Construction.useGlobalSorting", mUseGlobalSorting);
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287 | Environment::GetSingleton()->GetIntValue("BvHierarchy.minRaysForVisibility", mMinRaysForVisibility);
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288 | Environment::GetSingleton()->GetIntValue("BvHierarchy.maxTests", mMaxTests);
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289 |
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290 | //mMemoryConst = (float)(sizeof(VspLeaf) + sizeof(VspViewCell));
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291 | //mMemoryConst = (float)sizeof(BvhLeaf);
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292 | mMemoryConst = 16;//(float)sizeof(ObjectContainer);
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293 |
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294 | mUseBboxAreaForSah = true;
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295 |
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296 | /////////////
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297 | //-- debug output
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298 |
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299 | Debug << "******* Bvh hierarchy options ******** " << endl;
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300 | Debug << "max depth: " << mTermMaxDepth << endl;
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301 | Debug << "min probabiliy: " << mTermMinProbability<< endl;
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302 | Debug << "min objects: " << mTermMinObjects << endl;
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303 | Debug << "max cost ratio: " << mTermMaxCostRatio << endl;
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304 | Debug << "miss tolerance: " << mTermMissTolerance << endl;
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305 | Debug << "max leaves: " << mTermMaxLeaves << endl;
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306 | Debug << "randomize: " << randomize << endl;
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307 | Debug << "min global cost ratio: " << mTermMinGlobalCostRatio << endl;
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308 | Debug << "global cost miss tolerance: " << mTermGlobalCostMissTolerance << endl;
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309 | Debug << "only driving axis: " << mOnlyDrivingAxis << endl;
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310 | Debug << "max memory: " << mMaxMemory << endl;
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311 | Debug << "use cost heuristics: " << mUseCostHeuristics << endl;
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312 | Debug << "use surface area heuristics: " << mUseSah << endl;
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313 | Debug << "subdivision stats log: " << subdivisionStatsLog << endl;
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314 | Debug << "split borders: " << mSplitBorder << endl;
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315 | Debug << "render cost decrease weight: " << mRenderCostDecreaseWeight << endl;
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316 | Debug << "use global sort: " << mUseGlobalSorting << endl;
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317 | Debug << "minimal rays for visibility: " << mMinRaysForVisibility << endl;
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318 | Debug << "bvh mem const: " << mMemoryConst << endl;
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319 |
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320 | Debug << endl;
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321 | }
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322 |
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323 |
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324 | void BvHierarchy::AssociateObjectsWithLeaf(BvhLeaf *leaf)
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325 | {
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326 | ObjectContainer::const_iterator oit, oit_end = leaf->mObjects.end();
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327 |
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328 | for (oit = leaf->mObjects.begin(); oit != oit_end; ++ oit)
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329 | {
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330 | (*oit)->mBvhLeaf = leaf;
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331 | }
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332 | }
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333 |
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334 |
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335 | static int CountRays(const ObjectContainer &objects)
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336 | {
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337 | int nRays = 0;
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338 |
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339 | ObjectContainer::const_iterator oit, oit_end = objects.end();
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340 |
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341 | for (oit = objects.begin(); oit != oit_end; ++ oit)
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342 | {
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343 | nRays += (int)(*oit)->GetOrCreateRays()->size();
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344 | }
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345 |
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346 | return nRays;
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347 | }
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348 |
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349 |
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350 | BvhInterior *BvHierarchy::SubdivideNode(const BvhSubdivisionCandidate &sc,
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351 | BvhTraversalData &frontData,
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352 | BvhTraversalData &backData)
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353 | {
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354 | const BvhTraversalData &tData = sc.mParentData;
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355 | BvhLeaf *leaf = tData.mNode;
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356 | AxisAlignedBox3 parentBox = leaf->GetBoundingBox();
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357 |
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358 | // update stats: we have two new leaves
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359 | mBvhStats.nodes += 2;
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360 |
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361 | if (tData.mDepth > mBvhStats.maxDepth)
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362 | {
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363 | mBvhStats.maxDepth = tData.mDepth;
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364 | }
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365 |
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366 | // add the new nodes to the tree
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367 | BvhInterior *node = new BvhInterior(parentBox, leaf->GetParent());
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368 |
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369 |
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370 | //////////////////
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371 | //-- create front and back leaf
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372 |
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373 | AxisAlignedBox3 fbox = EvalBoundingBox(sc.mFrontObjects, &parentBox);
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374 | AxisAlignedBox3 bbox = EvalBoundingBox(sc.mBackObjects, &parentBox);
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375 |
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376 | BvhLeaf *back = new BvhLeaf(bbox, node, (int)sc.mBackObjects.size());
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377 | BvhLeaf *front = new BvhLeaf(fbox, node, (int)sc.mFrontObjects.size());
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378 |
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379 | BvhInterior *parent = leaf->GetParent();
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380 |
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381 | // replace a link from node's parent
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382 | if (parent)
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383 | {
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384 | parent->ReplaceChildLink(leaf, node);
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385 | node->SetParent(parent);
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386 | }
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387 | else // no parent => this node is the root
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388 | {
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389 | mRoot = node;
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390 | }
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391 |
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392 | // and setup child links
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393 | node->SetupChildLinks(front, back);
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394 |
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395 | ++ mBvhStats.splits;
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396 |
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397 |
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398 | ////////////////////////////////////////
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399 | //-- fill front and back traversal data with the new values
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400 |
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401 | frontData.mDepth = backData.mDepth = tData.mDepth + 1;
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402 |
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403 | frontData.mNode = front;
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404 | backData.mNode = back;
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405 |
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406 | back->mObjects = sc.mBackObjects;
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407 | front->mObjects = sc.mFrontObjects;
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408 |
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409 | // if the number of rays is too low, no assumptions can be made
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410 | // (=> switch to surface area heuristics?)
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411 | frontData.mNumRays = CountRays(sc.mFrontObjects);
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412 | backData.mNumRays = CountRays(sc.mBackObjects);
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413 |
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414 | AssociateObjectsWithLeaf(back);
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415 | AssociateObjectsWithLeaf(front);
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416 |
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417 | #if PROBABILIY_IS_BV_VOLUME
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418 | // volume of bvh (= probability that this bvh can be seen)
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419 | frontData.mProbability = fbox.GetVolume();
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420 | backData.mProbability = bbox.GetVolume();
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421 | #else
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422 | // compute probability of this node being visible,
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423 | // i.e., volume of the view cells that can see this node
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424 | frontData.mProbability = EvalViewCellsVolume(sc.mFrontObjects);
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425 | backData.mProbability = EvalViewCellsVolume(sc.mBackObjects);
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426 | #endif
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427 |
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428 | // how often was max cost ratio missed in this branch?
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429 | frontData.mMaxCostMisses = sc.GetMaxCostMisses();
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430 | backData.mMaxCostMisses = sc.GetMaxCostMisses();
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431 |
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432 | // set the time stamp so the order of traversal can be reconstructed
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433 | node->SetTimeStamp(mHierarchyManager->mTimeStamp ++);
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434 |
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435 | // assign the objects in sorted order
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436 | if (mUseGlobalSorting)
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437 | {
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438 | AssignSortedObjects(sc, frontData, backData);
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439 | }
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440 |
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441 | // return the new interior node
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442 | return node;
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443 | }
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444 |
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445 |
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446 | BvhNode *BvHierarchy::Subdivide(SplitQueue &tQueue,
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447 | SubdivisionCandidate *splitCandidate,
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448 | const bool globalCriteriaMet)
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449 | {
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450 | BvhSubdivisionCandidate *sc = dynamic_cast<BvhSubdivisionCandidate *>(splitCandidate);
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451 | BvhTraversalData &tData = sc->mParentData;
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452 |
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453 | BvhNode *currentNode = tData.mNode;
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454 |
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455 | if (!LocalTerminationCriteriaMet(tData) && !globalCriteriaMet)
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456 | {
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457 | //////////////
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458 | //-- continue subdivision
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459 |
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460 | BvhTraversalData tFrontData;
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461 | BvhTraversalData tBackData;
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462 |
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463 | // create new interior node and two leaf node
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464 | currentNode = SubdivideNode(*sc, tFrontData, tBackData);
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465 |
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466 | // decrease the weighted average cost of the subdivisoin
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467 | mTotalCost -= sc->GetRenderCostDecrease();
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468 | mPvsEntries += sc->GetPvsEntriesIncr();
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469 |
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470 | // subdivision statistics
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471 | if (1) PrintSubdivisionStats(*sc);
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472 |
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473 |
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474 | ///////////////////////////
|
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475 | //-- push the new split candidates on the queue
|
---|
476 |
|
---|
477 | BvhSubdivisionCandidate *frontCandidate = new BvhSubdivisionCandidate(tFrontData);
|
---|
478 | BvhSubdivisionCandidate *backCandidate = new BvhSubdivisionCandidate(tBackData);
|
---|
479 |
|
---|
480 | EvalSubdivisionCandidate(*frontCandidate);
|
---|
481 | EvalSubdivisionCandidate(*backCandidate);
|
---|
482 |
|
---|
483 | // cross reference
|
---|
484 | tFrontData.mNode->SetSubdivisionCandidate(frontCandidate);
|
---|
485 | tBackData.mNode->SetSubdivisionCandidate(backCandidate);
|
---|
486 |
|
---|
487 | //cout << "f: " << frontCandidate->GetPriority() << " b: " << backCandidate->GetPriority() << endl;
|
---|
488 | tQueue.Push(frontCandidate);
|
---|
489 | tQueue.Push(backCandidate);
|
---|
490 | }
|
---|
491 |
|
---|
492 | /////////////////////////////////
|
---|
493 | //-- node is a leaf => terminate traversal
|
---|
494 |
|
---|
495 | if (currentNode->IsLeaf())
|
---|
496 | {
|
---|
497 | /////////////////////
|
---|
498 | //-- store additional info
|
---|
499 | EvaluateLeafStats(tData);
|
---|
500 |
|
---|
501 | // this leaf is no candidate for splitting anymore
|
---|
502 | // => detach subdivision candidate
|
---|
503 | tData.mNode->SetSubdivisionCandidate(NULL);
|
---|
504 | // detach node so we don't delete it with the traversal data
|
---|
505 | tData.mNode = NULL;
|
---|
506 | }
|
---|
507 |
|
---|
508 | return currentNode;
|
---|
509 | }
|
---|
510 |
|
---|
511 |
|
---|
512 | void BvHierarchy::EvalSubdivisionCandidate(BvhSubdivisionCandidate &splitCandidate,
|
---|
513 | bool computeSplitPlane)
|
---|
514 | {
|
---|
515 | if (computeSplitPlane)
|
---|
516 | {
|
---|
517 | const bool sufficientSamples =
|
---|
518 | splitCandidate.mParentData.mNumRays > mMinRaysForVisibility;
|
---|
519 |
|
---|
520 | const bool useVisibiliyBasedHeuristics =
|
---|
521 | !mUseSah &&
|
---|
522 | (mHierarchyManager->GetViewSpaceSubdivisionType() ==
|
---|
523 | HierarchyManager::KD_BASED_VIEWSPACE_SUBDIV) &&
|
---|
524 | sufficientSamples;
|
---|
525 |
|
---|
526 | // compute best object partition
|
---|
527 | const float ratio = SelectObjectPartition(splitCandidate.mParentData,
|
---|
528 | splitCandidate.mFrontObjects,
|
---|
529 | splitCandidate.mBackObjects,
|
---|
530 | useVisibiliyBasedHeuristics);
|
---|
531 |
|
---|
532 | // cost ratio violated?
|
---|
533 | const bool maxCostRatioViolated = mTermMaxCostRatio < ratio;
|
---|
534 | const int previousMisses = splitCandidate.mParentData.mMaxCostMisses;
|
---|
535 |
|
---|
536 | splitCandidate.SetMaxCostMisses(maxCostRatioViolated ? previousMisses + 1 : previousMisses);
|
---|
537 |
|
---|
538 | }
|
---|
539 |
|
---|
540 | BvhLeaf *leaf = splitCandidate.mParentData.mNode;
|
---|
541 |
|
---|
542 | const float oldProp = EvalViewCellsVolume(leaf->mObjects);
|
---|
543 | const float oldRenderCost = EvalRenderCost(leaf->mObjects);
|
---|
544 |
|
---|
545 | // compute global decrease in render cost
|
---|
546 | const float newRenderCost = EvalRenderCost(splitCandidate.mFrontObjects) +
|
---|
547 | EvalRenderCost(splitCandidate.mBackObjects);
|
---|
548 |
|
---|
549 | const float renderCostDecr = oldRenderCost - newRenderCost;
|
---|
550 |
|
---|
551 | splitCandidate.SetRenderCostDecrease(renderCostDecr);
|
---|
552 |
|
---|
553 | // increase in pvs entries
|
---|
554 | const int pvsEntriesIncr = EvalPvsEntriesIncr(splitCandidate);
|
---|
555 | splitCandidate.SetPvsEntriesIncr(pvsEntriesIncr);
|
---|
556 |
|
---|
557 | #ifdef GTP_DEBUG
|
---|
558 | Debug << "old render cost: " << oldRenderCost << endl;
|
---|
559 | Debug << "new render cost: " << newRenderCost << endl;
|
---|
560 | Debug << "render cost decrease: " << renderCostDecr << endl;
|
---|
561 | #endif
|
---|
562 |
|
---|
563 | float priority;
|
---|
564 |
|
---|
565 | // surface area heuristics is used when there is no view space subdivision available.
|
---|
566 | // In order to have some prioritized traversal, use this formula instead
|
---|
567 | if (mHierarchyManager->GetViewSpaceSubdivisionType() ==
|
---|
568 | HierarchyManager::NO_VIEWSPACE_SUBDIV)
|
---|
569 | {
|
---|
570 | priority = EvalSahCost(leaf);
|
---|
571 | }
|
---|
572 | else
|
---|
573 | {
|
---|
574 | // take render cost of node into account
|
---|
575 | // otherwise danger of being stuck in a local minimum!
|
---|
576 | const float factor = mRenderCostDecreaseWeight;
|
---|
577 |
|
---|
578 | if (1)
|
---|
579 | {
|
---|
580 | priority = factor * renderCostDecr + (1.0f - factor) * oldRenderCost;
|
---|
581 | if (mHierarchyManager->mConsiderMemory)
|
---|
582 | {
|
---|
583 | priority /= ((float)splitCandidate.GetPvsEntriesIncr() + mMemoryConst);
|
---|
584 | }
|
---|
585 | }
|
---|
586 | else
|
---|
587 | {
|
---|
588 | if (!mHierarchyManager->mConsiderMemory)
|
---|
589 | {
|
---|
590 | priority = factor * renderCostDecr + (1.0f - factor) * oldRenderCost;
|
---|
591 | }
|
---|
592 | else
|
---|
593 | {
|
---|
594 | const float ratio =
|
---|
595 | renderCostDecr / ((float)splitCandidate.GetPvsEntriesIncr() + mMemoryConst);
|
---|
596 |
|
---|
597 | priority = factor * ratio + (1.0f - factor) * oldRenderCost;
|
---|
598 | }
|
---|
599 | }
|
---|
600 | }
|
---|
601 |
|
---|
602 | // hack: don't allow empty splits to be taken
|
---|
603 | if (splitCandidate.mFrontObjects.empty() || splitCandidate.mBackObjects.empty())
|
---|
604 | priority = 0;
|
---|
605 | // compute global decrease in render cost
|
---|
606 | splitCandidate.SetPriority(priority);
|
---|
607 | }
|
---|
608 |
|
---|
609 |
|
---|
610 | int BvHierarchy::EvalPvsEntriesIncr(BvhSubdivisionCandidate &splitCandidate) const
|
---|
611 | {
|
---|
612 | const int oldPvsSize = CountViewCells(splitCandidate.mParentData.mNode->mObjects);
|
---|
613 |
|
---|
614 | const int fPvsSize = CountViewCells(splitCandidate.mFrontObjects);
|
---|
615 | const int bPvsSize = CountViewCells(splitCandidate.mBackObjects);
|
---|
616 |
|
---|
617 | return fPvsSize + bPvsSize - oldPvsSize;
|
---|
618 | }
|
---|
619 |
|
---|
620 |
|
---|
621 | inline bool BvHierarchy::LocalTerminationCriteriaMet(const BvhTraversalData &data) const
|
---|
622 | {
|
---|
623 | const bool terminationCriteriaMet =
|
---|
624 | (0
|
---|
625 | || ((int)data.mNode->mObjects.size() <= 1)//mTermMinObjects)
|
---|
626 | //|| (data.mProbability <= mTermMinProbability)
|
---|
627 | //|| (data.mNumRays <= mTermMinRays)
|
---|
628 | );
|
---|
629 |
|
---|
630 | #ifdef _DEBUG
|
---|
631 | if (terminationCriteriaMet)
|
---|
632 | {
|
---|
633 | cout << "bvh local termination criteria met:" << endl;
|
---|
634 | cout << "objects: " << data.mNode->mObjects.size() << " " << mTermMinObjects << endl;
|
---|
635 | }
|
---|
636 | #endif
|
---|
637 | return terminationCriteriaMet;
|
---|
638 | }
|
---|
639 |
|
---|
640 |
|
---|
641 | inline bool BvHierarchy::GlobalTerminationCriteriaMet(const BvhTraversalData &data) const
|
---|
642 | {
|
---|
643 | // note: tracking for global cost termination
|
---|
644 | // does not make much sense for interleaved vsp / osp partition
|
---|
645 | // as it is the responsibility of the hierarchy manager
|
---|
646 |
|
---|
647 | const bool terminationCriteriaMet =
|
---|
648 | (0
|
---|
649 | || (mBvhStats.Leaves() >= mTermMaxLeaves)
|
---|
650 | //|| (mBvhStats.mGlobalCostMisses >= mTermGlobalCostMissTolerance)
|
---|
651 | //|| mOutOfMemory
|
---|
652 | );
|
---|
653 |
|
---|
654 | #ifdef GTP_DEBUG
|
---|
655 | if (terminationCriteriaMet)
|
---|
656 | {
|
---|
657 | Debug << "bvh global termination criteria met:" << endl;
|
---|
658 | Debug << "cost misses: " << mBvhStats.mGlobalCostMisses << " " << mTermGlobalCostMissTolerance << endl;
|
---|
659 | Debug << "leaves: " << mBvhStats.Leaves() << " " << mTermMaxLeaves << endl;
|
---|
660 | }
|
---|
661 | #endif
|
---|
662 | return terminationCriteriaMet;
|
---|
663 | }
|
---|
664 |
|
---|
665 |
|
---|
666 | void BvHierarchy::EvaluateLeafStats(const BvhTraversalData &data)
|
---|
667 | {
|
---|
668 | // the node became a leaf -> evaluate stats for leafs
|
---|
669 | BvhLeaf *leaf = data.mNode;
|
---|
670 |
|
---|
671 | ++ mCreatedLeaves;
|
---|
672 |
|
---|
673 |
|
---|
674 | if (data.mProbability <= mTermMinProbability)
|
---|
675 | {
|
---|
676 | ++ mBvhStats.minProbabilityNodes;
|
---|
677 | }
|
---|
678 |
|
---|
679 | ////////////////////////////////////////////
|
---|
680 | // depth related stuff
|
---|
681 |
|
---|
682 | if (data.mDepth < mBvhStats.minDepth)
|
---|
683 | {
|
---|
684 | mBvhStats.minDepth = data.mDepth;
|
---|
685 | }
|
---|
686 |
|
---|
687 | if (data.mDepth >= mTermMaxDepth)
|
---|
688 | {
|
---|
689 | ++ mBvhStats.maxDepthNodes;
|
---|
690 | }
|
---|
691 |
|
---|
692 | // accumulate depth to compute average depth
|
---|
693 | mBvhStats.accumDepth += data.mDepth;
|
---|
694 |
|
---|
695 |
|
---|
696 | ////////////////////////////////////////////
|
---|
697 | // objects related stuff
|
---|
698 |
|
---|
699 | // note: the sum should alwaysbe total number of objects for bvh
|
---|
700 | mBvhStats.objectRefs += (int)leaf->mObjects.size();
|
---|
701 |
|
---|
702 | if ((int)leaf->mObjects.size() <= mTermMinObjects)
|
---|
703 | {
|
---|
704 | ++ mBvhStats.minObjectsNodes;
|
---|
705 | }
|
---|
706 |
|
---|
707 | if (leaf->mObjects.empty())
|
---|
708 | {
|
---|
709 | ++ mBvhStats.emptyNodes;
|
---|
710 | }
|
---|
711 |
|
---|
712 | if ((int)leaf->mObjects.size() > mBvhStats.maxObjectRefs)
|
---|
713 | {
|
---|
714 | mBvhStats.maxObjectRefs = (int)leaf->mObjects.size();
|
---|
715 | }
|
---|
716 |
|
---|
717 | if ((int)leaf->mObjects.size() < mBvhStats.minObjectRefs)
|
---|
718 | {
|
---|
719 | mBvhStats.minObjectRefs = (int)leaf->mObjects.size();
|
---|
720 | }
|
---|
721 |
|
---|
722 | ////////////////////////////////////////////
|
---|
723 | // ray related stuff
|
---|
724 |
|
---|
725 | // note: this number should always accumulate to the total number of rays
|
---|
726 | mBvhStats.rayRefs += data.mNumRays;
|
---|
727 |
|
---|
728 | if (data.mNumRays <= mTermMinRays)
|
---|
729 | {
|
---|
730 | ++ mBvhStats.minRaysNodes;
|
---|
731 | }
|
---|
732 |
|
---|
733 | if (data.mNumRays > mBvhStats.maxRayRefs)
|
---|
734 | {
|
---|
735 | mBvhStats.maxRayRefs = data.mNumRays;
|
---|
736 | }
|
---|
737 |
|
---|
738 | if (data.mNumRays < mBvhStats.minRayRefs)
|
---|
739 | {
|
---|
740 | mBvhStats.minRayRefs = data.mNumRays;
|
---|
741 | }
|
---|
742 |
|
---|
743 | #ifdef _DEBUG
|
---|
744 | cout << "depth: " << data.mDepth << " objects: " << (int)leaf->mObjects.size()
|
---|
745 | << " rays: " << data.mNumRays << " rays / objects "
|
---|
746 | << (float)data.mNumRays / (float)leaf->mObjects.size() << endl;
|
---|
747 | #endif
|
---|
748 | }
|
---|
749 |
|
---|
750 |
|
---|
751 | #if 0
|
---|
752 |
|
---|
753 | /// compute object boundaries using spatial mid split
|
---|
754 | float BvHierarchy::EvalLocalObjectPartition(const BvhTraversalData &tData,
|
---|
755 | const int axis,
|
---|
756 | ObjectContainer &objectsFront,
|
---|
757 | ObjectContainer &objectsBack)
|
---|
758 | {
|
---|
759 | const float maxBox = tData.mBoundingBox.Max(axis);
|
---|
760 | const float minBox = tData.mBoundingBox.Min(axis);
|
---|
761 |
|
---|
762 | float midPoint = (maxBox + minBox) * 0.5f;
|
---|
763 |
|
---|
764 | ObjectContainer::const_iterator oit, oit_end = tData.mNode->mObjects.end();
|
---|
765 |
|
---|
766 | for (oit = tData.mNode->mObjects.begin(); oit != oit_end; ++ oit)
|
---|
767 | {
|
---|
768 | Intersectable *obj = *oit;
|
---|
769 | const AxisAlignedBox3 box = obj->GetBox();
|
---|
770 |
|
---|
771 | const float objMid = (box.Max(axis) + box.Min(axis)) * 0.5f;
|
---|
772 |
|
---|
773 | // object mailed => belongs to back objects
|
---|
774 | if (objMid < midPoint)
|
---|
775 | {
|
---|
776 | objectsBack.push_back(obj);
|
---|
777 | }
|
---|
778 | else
|
---|
779 | {
|
---|
780 | objectsFront.push_back(obj);
|
---|
781 | }
|
---|
782 | }
|
---|
783 |
|
---|
784 | const float oldRenderCost = EvalRenderCost(tData.mNode->mObjects);
|
---|
785 | const float newRenderCost = EvalRenderCost(objectsFront) * EvalRenderCost(objectsBack);
|
---|
786 |
|
---|
787 | const float ratio = newRenderCost / oldRenderCost;
|
---|
788 | return ratio;
|
---|
789 | }
|
---|
790 |
|
---|
791 | #else
|
---|
792 |
|
---|
793 | /// compute object partition by getting balanced objects on the left and right side
|
---|
794 | float BvHierarchy::EvalLocalObjectPartition(const BvhTraversalData &tData,
|
---|
795 | const int axis,
|
---|
796 | ObjectContainer &objectsFront,
|
---|
797 | ObjectContainer &objectsBack)
|
---|
798 | {
|
---|
799 | PrepareLocalSubdivisionCandidates(tData, axis);
|
---|
800 |
|
---|
801 | SortableEntryContainer::const_iterator cit, cit_end = mSubdivisionCandidates->end();
|
---|
802 |
|
---|
803 | int i = 0;
|
---|
804 | const int border = (int)tData.mNode->mObjects.size() / 2;
|
---|
805 |
|
---|
806 | for (cit = mSubdivisionCandidates->begin(); cit != cit_end; ++ cit, ++ i)
|
---|
807 | {
|
---|
808 | Intersectable *obj = (*cit).mObject;
|
---|
809 |
|
---|
810 | // object mailed => belongs to back objects
|
---|
811 | if (i < border)
|
---|
812 | {
|
---|
813 | objectsBack.push_back(obj);
|
---|
814 | }
|
---|
815 | else
|
---|
816 | {
|
---|
817 | objectsFront.push_back(obj);
|
---|
818 | }
|
---|
819 | }
|
---|
820 |
|
---|
821 | #if 1
|
---|
822 | const float cost = (tData.mNode->GetBoundingBox().Size().DrivingAxis() == axis) ? -1.0f : 0.0f;
|
---|
823 | #else
|
---|
824 | const float oldRenderCost = EvalRenderCost(tData.mNode->mObjects);
|
---|
825 | const float newRenderCost = EvalRenderCost(objectsFront) * EvalRenderCost(objectsBack);
|
---|
826 |
|
---|
827 | const float cost = newRenderCost / oldRenderCost;
|
---|
828 | #endif
|
---|
829 |
|
---|
830 | return cost;
|
---|
831 | }
|
---|
832 | #endif
|
---|
833 |
|
---|
834 | #if 1
|
---|
835 |
|
---|
836 | float BvHierarchy::EvalSah(const BvhTraversalData &tData,
|
---|
837 | const int axis,
|
---|
838 | ObjectContainer &objectsFront,
|
---|
839 | ObjectContainer &objectsBack)
|
---|
840 | {
|
---|
841 | // go through the lists, count the number of objects left and right
|
---|
842 | // and evaluate the following cost funcion:
|
---|
843 | // C = ct_div_ci + (ol + or) / queries
|
---|
844 | PrepareLocalSubdivisionCandidates(tData, axis);
|
---|
845 |
|
---|
846 | const float totalRenderCost = EvalAbsCost(tData.mNode->mObjects);
|
---|
847 | float objectsLeft = 0, objectsRight = totalRenderCost;
|
---|
848 |
|
---|
849 | const AxisAlignedBox3 nodeBbox = tData.mNode->GetBoundingBox();
|
---|
850 | const float boxArea = nodeBbox.SurfaceArea();
|
---|
851 |
|
---|
852 | float minSum = 1e20f;
|
---|
853 |
|
---|
854 | float minBorder = nodeBbox.Max(axis);
|
---|
855 | float maxBorder = nodeBbox.Min(axis);
|
---|
856 |
|
---|
857 | float areaLeft = 0, areaRight = 0;
|
---|
858 |
|
---|
859 | SortableEntryContainer::const_iterator currentPos =
|
---|
860 | mSubdivisionCandidates->begin();
|
---|
861 |
|
---|
862 | vector<float> bordersRight;
|
---|
863 |
|
---|
864 | // we keep track of both borders of the bounding boxes =>
|
---|
865 | // store the events in descending order
|
---|
866 |
|
---|
867 | bordersRight.resize(mSubdivisionCandidates->size());
|
---|
868 |
|
---|
869 | SortableEntryContainer::reverse_iterator rcit =
|
---|
870 | mSubdivisionCandidates->rbegin(), rcit_end =
|
---|
871 | mSubdivisionCandidates->rend();
|
---|
872 |
|
---|
873 | vector<float>::reverse_iterator rbit = bordersRight.rbegin();
|
---|
874 |
|
---|
875 | for (; rcit != rcit_end; ++ rcit, ++ rbit)
|
---|
876 | {
|
---|
877 | Intersectable *obj = (*rcit).mObject;
|
---|
878 | const AxisAlignedBox3 obox = obj->GetBox();
|
---|
879 |
|
---|
880 | if (obox.Min(axis) < minBorder)
|
---|
881 | {
|
---|
882 | minBorder = obox.Min(axis);
|
---|
883 | }
|
---|
884 |
|
---|
885 | (*rbit) = minBorder;
|
---|
886 | }
|
---|
887 |
|
---|
888 | // temporary surface areas
|
---|
889 | float al = 0;
|
---|
890 | float ar = boxArea;
|
---|
891 |
|
---|
892 | vector<float>::const_iterator bit = bordersRight.begin();
|
---|
893 | SortableEntryContainer::const_iterator cit, cit_end = mSubdivisionCandidates->end();
|
---|
894 |
|
---|
895 | for (cit = mSubdivisionCandidates->begin(); cit != cit_end; ++ cit, ++ bit)
|
---|
896 | {
|
---|
897 | Intersectable *obj = (*cit).mObject;
|
---|
898 |
|
---|
899 | const float renderCost = mViewCellsManager->EvalRenderCost(obj);
|
---|
900 |
|
---|
901 | objectsLeft += renderCost;
|
---|
902 | objectsRight -= renderCost;
|
---|
903 |
|
---|
904 | const AxisAlignedBox3 obox = obj->GetBox();
|
---|
905 |
|
---|
906 | // the borders of the bounding boxes have changed
|
---|
907 | if (obox.Max(axis) > maxBorder)
|
---|
908 | {
|
---|
909 | maxBorder = obox.Max(axis);
|
---|
910 | }
|
---|
911 |
|
---|
912 | minBorder = (*bit);
|
---|
913 |
|
---|
914 | AxisAlignedBox3 lbox = nodeBbox;
|
---|
915 | AxisAlignedBox3 rbox = nodeBbox;
|
---|
916 |
|
---|
917 | lbox.SetMax(axis, maxBorder);
|
---|
918 | rbox.SetMin(axis, minBorder);
|
---|
919 |
|
---|
920 | al = lbox.SurfaceArea();
|
---|
921 | ar = rbox.SurfaceArea();
|
---|
922 |
|
---|
923 | const bool noValidSplit = ((objectsLeft <= Limits::Small) || (objectsRight <= Limits::Small));
|
---|
924 | const float sum = noValidSplit ? 1e25 : objectsLeft * al + objectsRight * ar;
|
---|
925 |
|
---|
926 | /*cout << "pos=" << (*cit).mPos << "\t q=(" << objectsLeft << "," << objectsRight <<")\t r=("
|
---|
927 | << lbox.SurfaceArea() << "," << rbox.SurfaceArea() << ")" << endl;
|
---|
928 | cout << "minborder: " << minBorder << " maxborder: " << maxBorder << endl;
|
---|
929 | cout << "cost= " << sum << endl;*/
|
---|
930 |
|
---|
931 | if (sum < minSum)
|
---|
932 | {
|
---|
933 | minSum = sum;
|
---|
934 | areaLeft = al;
|
---|
935 | areaRight = ar;
|
---|
936 |
|
---|
937 | // objects belong to left side now
|
---|
938 | for (; currentPos != (cit + 1); ++ currentPos);
|
---|
939 | }
|
---|
940 | }
|
---|
941 |
|
---|
942 | ////////////
|
---|
943 | //-- assign object to front and back volume
|
---|
944 |
|
---|
945 | // belongs to back bv
|
---|
946 | for (cit = mSubdivisionCandidates->begin(); cit != currentPos; ++ cit)
|
---|
947 | objectsBack.push_back((*cit).mObject);
|
---|
948 |
|
---|
949 | // belongs to front bv
|
---|
950 | for (cit = currentPos; cit != cit_end; ++ cit)
|
---|
951 | objectsFront.push_back((*cit).mObject);
|
---|
952 |
|
---|
953 | float newCost = minSum / boxArea;
|
---|
954 | float ratio = newCost / totalRenderCost;
|
---|
955 |
|
---|
956 | #ifdef GTP_DEBUG
|
---|
957 | cout << "\n\nobjects=(" << (int)objectsBack.size() << "," << (int)objectsFront.size() << " of "
|
---|
958 | << (int)tData.mNode->mObjects.size() << ")\t area=("
|
---|
959 | << areaLeft << ", " << areaRight << ", " << boxArea << ")" << endl
|
---|
960 | << "cost= " << newCost << " oldCost=" << totalRenderCost / boxArea << endl;
|
---|
961 | #endif
|
---|
962 |
|
---|
963 | return ratio;
|
---|
964 | }
|
---|
965 |
|
---|
966 | #else
|
---|
967 |
|
---|
968 | float BvHierarchy::EvalSah(const BvhTraversalData &tData,
|
---|
969 | const int axis,
|
---|
970 | ObjectContainer &objectsFront,
|
---|
971 | ObjectContainer &objectsBack)
|
---|
972 | {
|
---|
973 | // go through the lists, count the number of objects left and right
|
---|
974 | // and evaluate the following cost funcion:
|
---|
975 | // C = ct_div_ci + (ol + or) / queries
|
---|
976 | PrepareLocalSubdivisionCandidates(tData, axis);
|
---|
977 |
|
---|
978 | const float totalRenderCost = EvalAbsCost(tData.mNode->mObjects);
|
---|
979 | float objectsLeft = 0, objectsRight = totalRenderCost;
|
---|
980 |
|
---|
981 | const AxisAlignedBox3 nodeBbox = tData.mNode->GetBoundingBox();
|
---|
982 |
|
---|
983 | const float minBox = nodeBbox.Min(axis);
|
---|
984 | const float maxBox = nodeBbox.Max(axis);
|
---|
985 | const float boxArea = nodeBbox.SurfaceArea();
|
---|
986 |
|
---|
987 | float minSum = 1e20f;
|
---|
988 |
|
---|
989 | Vector3 minBorder = nodeBbox.Max();
|
---|
990 | Vector3 maxBorder = nodeBbox.Min();
|
---|
991 |
|
---|
992 | float areaLeft = 0, areaRight = 0;
|
---|
993 |
|
---|
994 | SortableEntryContainer::const_iterator currentPos =
|
---|
995 | mSubdivisionCandidates->begin();
|
---|
996 |
|
---|
997 | vector<Vector3> bordersRight;
|
---|
998 |
|
---|
999 | // we keep track of both borders of the bounding boxes =>
|
---|
1000 | // store the events in descending order
|
---|
1001 | bordersRight.resize(mSubdivisionCandidates->size());
|
---|
1002 |
|
---|
1003 | SortableEntryContainer::reverse_iterator rcit =
|
---|
1004 | mSubdivisionCandidates->rbegin(), rcit_end =
|
---|
1005 | mSubdivisionCandidates->rend();
|
---|
1006 |
|
---|
1007 | vector<Vector3>::reverse_iterator rbit = bordersRight.rbegin();
|
---|
1008 |
|
---|
1009 | for (; rcit != rcit_end; ++ rcit, ++ rbit)
|
---|
1010 | {
|
---|
1011 | Intersectable *obj = (*rcit).mObject;
|
---|
1012 | const AxisAlignedBox3 obox = obj->GetBox();
|
---|
1013 |
|
---|
1014 | for (int i = 0; i < 3; ++ i)
|
---|
1015 | {
|
---|
1016 | if (obox.Min(i) < minBorder[i])
|
---|
1017 | {
|
---|
1018 | minBorder[i] = obox.Min(i);
|
---|
1019 | }
|
---|
1020 | }
|
---|
1021 |
|
---|
1022 | (*rbit) = minBorder;
|
---|
1023 | }
|
---|
1024 |
|
---|
1025 | // temporary surface areas
|
---|
1026 | float al = 0;
|
---|
1027 | float ar = boxArea;
|
---|
1028 |
|
---|
1029 | vector<Vector3>::const_iterator bit = bordersRight.begin();
|
---|
1030 | SortableEntryContainer::const_iterator cit, cit_end =
|
---|
1031 | mSubdivisionCandidates->end();
|
---|
1032 |
|
---|
1033 | for (cit = mSubdivisionCandidates->begin(); cit != cit_end; ++ cit, ++ bit)
|
---|
1034 | {
|
---|
1035 | Intersectable *obj = (*cit).mObject;
|
---|
1036 |
|
---|
1037 | const float renderCost = mViewCellsManager->EvalRenderCost(obj);
|
---|
1038 |
|
---|
1039 | objectsLeft += renderCost;
|
---|
1040 | objectsRight -= renderCost;
|
---|
1041 |
|
---|
1042 | const AxisAlignedBox3 obox = obj->GetBox();
|
---|
1043 |
|
---|
1044 | AxisAlignedBox3 lbox = nodeBbox;
|
---|
1045 | AxisAlignedBox3 rbox = nodeBbox;
|
---|
1046 |
|
---|
1047 | // the borders of the left bounding box have changed
|
---|
1048 | for (int i = 0; i < 3; ++ i)
|
---|
1049 | {
|
---|
1050 | if (obox.Max(i) > maxBorder[i])
|
---|
1051 | {
|
---|
1052 | maxBorder[i] = obox.Max(i);
|
---|
1053 | }
|
---|
1054 | }
|
---|
1055 |
|
---|
1056 | minBorder = (*bit);
|
---|
1057 |
|
---|
1058 | lbox.SetMax(maxBorder);
|
---|
1059 | rbox.SetMin(minBorder);
|
---|
1060 |
|
---|
1061 | al = lbox.SurfaceArea();
|
---|
1062 | ar = rbox.SurfaceArea();
|
---|
1063 |
|
---|
1064 | const bool noValidSplit = ((objectsLeft <= Limits::Small) || (objectsRight <= Limits::Small));
|
---|
1065 | const float sum = noValidSplit ? 1e25 : objectsLeft * al + objectsRight * ar;
|
---|
1066 |
|
---|
1067 | /*cout << "pos=" << (*cit).mPos << "\t q=(" << objectsLeft << "," << objectsRight <<")\t r=("
|
---|
1068 | << lbox.SurfaceArea() << "," << rbox.SurfaceArea() << ")" << endl;
|
---|
1069 | cout << "minborder: " << minBorder << " maxborder: " << maxBorder << endl;
|
---|
1070 | cout << "cost= " << sum << endl;*/
|
---|
1071 |
|
---|
1072 | if (sum < minSum)
|
---|
1073 | {
|
---|
1074 | minSum = sum;
|
---|
1075 | areaLeft = al;
|
---|
1076 | areaRight = ar;
|
---|
1077 |
|
---|
1078 | // objects belong to left side now
|
---|
1079 | for (; currentPos != (cit + 1); ++ currentPos);
|
---|
1080 | }
|
---|
1081 | }
|
---|
1082 |
|
---|
1083 | /////////////
|
---|
1084 | //-- assign object to front and back volume
|
---|
1085 |
|
---|
1086 | // belongs to back bv
|
---|
1087 | for (cit = mSubdivisionCandidates->begin(); cit != currentPos; ++ cit)
|
---|
1088 | objectsBack.push_back((*cit).mObject);
|
---|
1089 |
|
---|
1090 | // belongs to front bv
|
---|
1091 | for (cit = currentPos; cit != cit_end; ++ cit)
|
---|
1092 | objectsFront.push_back((*cit).mObject);
|
---|
1093 |
|
---|
1094 | float newCost = minSum / boxArea;
|
---|
1095 | float ratio = newCost / totalRenderCost;
|
---|
1096 |
|
---|
1097 | #ifdef GTP_DEBUG
|
---|
1098 | cout << "\n\nobjects=(" << (int)objectsBack.size() << "," << (int)objectsFront.size() << " of "
|
---|
1099 | << (int)tData.mNode->mObjects.size() << ")\t area=("
|
---|
1100 | << areaLeft << ", " << areaRight << ", " << boxArea << ")" << endl
|
---|
1101 | << "cost= " << newCost << " oldCost=" << totalRenderCost / boxArea << endl;
|
---|
1102 | #endif
|
---|
1103 |
|
---|
1104 | return ratio;
|
---|
1105 | }
|
---|
1106 |
|
---|
1107 | #endif
|
---|
1108 |
|
---|
1109 | static bool PrepareOutput(const int axis,
|
---|
1110 | const int leaves,
|
---|
1111 | ofstream &sumStats,
|
---|
1112 | ofstream &vollStats,
|
---|
1113 | ofstream &volrStats)
|
---|
1114 | {
|
---|
1115 | if ((axis == 0) && (leaves > 0) && (leaves < 90))
|
---|
1116 | {
|
---|
1117 | char str[64];
|
---|
1118 | sprintf(str, "tmp/bvh_heur_sum-%04d.log", leaves);
|
---|
1119 | sumStats.open(str);
|
---|
1120 | sprintf(str, "tmp/bvh_heur_voll-%04d.log", leaves);
|
---|
1121 | vollStats.open(str);
|
---|
1122 | sprintf(str, "tmp/bvh_heur_volr-%04d.log", leaves);
|
---|
1123 | volrStats.open(str);
|
---|
1124 | }
|
---|
1125 |
|
---|
1126 | return sumStats.is_open() && vollStats.is_open() && volrStats.is_open();
|
---|
1127 | }
|
---|
1128 |
|
---|
1129 |
|
---|
1130 | static void PrintHeuristics(const float objectsRight,
|
---|
1131 | const float sum,
|
---|
1132 | const float volLeft,
|
---|
1133 | const float volRight,
|
---|
1134 | const float viewSpaceVol,
|
---|
1135 | ofstream &sumStats,
|
---|
1136 | ofstream &vollStats,
|
---|
1137 | ofstream &volrStats)
|
---|
1138 | {
|
---|
1139 | sumStats
|
---|
1140 | << "#Position\n" << objectsRight << endl
|
---|
1141 | << "#Sum\n" << sum / viewSpaceVol << endl
|
---|
1142 | << "#Vol\n" << (volLeft + volRight) / viewSpaceVol << endl;
|
---|
1143 |
|
---|
1144 | vollStats
|
---|
1145 | << "#Position\n" << objectsRight << endl
|
---|
1146 | << "#Vol\n" << volLeft / viewSpaceVol << endl;
|
---|
1147 |
|
---|
1148 | volrStats
|
---|
1149 | << "#Position\n" << objectsRight << endl
|
---|
1150 | << "#Vol\n" << volRight / viewSpaceVol << endl;
|
---|
1151 | }
|
---|
1152 |
|
---|
1153 |
|
---|
1154 | float BvHierarchy::EvalLocalCostHeuristics(const BvhTraversalData &tData,
|
---|
1155 | const int axis,
|
---|
1156 | ObjectContainer &objectsFront,
|
---|
1157 | ObjectContainer &objectsBack)
|
---|
1158 | {
|
---|
1159 | ///////////////////////////////////////////////////////
|
---|
1160 | //-- go through the lists, count the number of objects left
|
---|
1161 | //-- and right and evaluate the cost funcion
|
---|
1162 |
|
---|
1163 | // prepare the heuristics by setting mailboxes and counters.
|
---|
1164 | const float totalVol = PrepareHeuristics(tData, axis);
|
---|
1165 |
|
---|
1166 | // local helper variables
|
---|
1167 | float volLeft = 0;
|
---|
1168 | float volRight = totalVol;
|
---|
1169 |
|
---|
1170 | const float nTotalObjects = EvalAbsCost(tData.mNode->mObjects);
|
---|
1171 | float nObjectsLeft = 0;
|
---|
1172 | float nObjectsRight = nTotalObjects;
|
---|
1173 |
|
---|
1174 | const float viewSpaceVol = mViewCellsManager->GetViewSpaceBox().GetVolume();
|
---|
1175 |
|
---|
1176 | SortableEntryContainer::const_iterator backObjectsStart =
|
---|
1177 | mSubdivisionCandidates->begin();
|
---|
1178 |
|
---|
1179 | /////////////////////////////////
|
---|
1180 | //-- the parameters for the current optimum
|
---|
1181 |
|
---|
1182 | float volBack = volLeft;
|
---|
1183 | float volFront = volRight;
|
---|
1184 | float newRenderCost = nTotalObjects * totalVol;
|
---|
1185 |
|
---|
1186 | #ifdef GTP_DEBUG
|
---|
1187 | ofstream sumStats;
|
---|
1188 | ofstream vollStats;
|
---|
1189 | ofstream volrStats;
|
---|
1190 |
|
---|
1191 | const bool printStats =
|
---|
1192 | PrepareOutput(axis, mBvhStats.Leaves(), sumStats, vollStats, volrStats);
|
---|
1193 | #endif
|
---|
1194 |
|
---|
1195 | ///////////////////////
|
---|
1196 | //-- the sweep heuristics
|
---|
1197 | //-- traverse through events and find best split plane
|
---|
1198 |
|
---|
1199 | SortableEntryContainer::const_iterator cit,
|
---|
1200 | cit_end = cit_end = mSubdivisionCandidates->end();
|
---|
1201 |
|
---|
1202 | for (cit = mSubdivisionCandidates->begin(); cit != cit_end; ++ cit)
|
---|
1203 | {
|
---|
1204 | Intersectable *object = (*cit).mObject;
|
---|
1205 |
|
---|
1206 | // evaluate change in l and r volume
|
---|
1207 | // voll = view cells that see only left node (i.e., left pvs)
|
---|
1208 | // volr = view cells that see only right node (i.e., right pvs)
|
---|
1209 | EvalHeuristicsContribution(object, volLeft, volRight);
|
---|
1210 |
|
---|
1211 | const float rc = mViewCellsManager->EvalRenderCost(object);
|
---|
1212 |
|
---|
1213 | nObjectsLeft += rc;
|
---|
1214 | nObjectsRight -= rc;
|
---|
1215 |
|
---|
1216 | const bool noValidSplit = ((nObjectsLeft <= Limits::Small) || (nObjectsRight <= Limits::Small));
|
---|
1217 |
|
---|
1218 | // the heuristics
|
---|
1219 | const float sum = noValidSplit ?
|
---|
1220 | 1e25 : volLeft * (float)nObjectsLeft + volRight * (float)nObjectsRight;
|
---|
1221 |
|
---|
1222 | #ifdef GTP_DEBUG
|
---|
1223 | if (printStats)
|
---|
1224 | {
|
---|
1225 | PrintHeuristics(nObjectsRight, sum, volLeft, volRight, viewSpaceVol,
|
---|
1226 | sumStats, vollStats, volrStats);
|
---|
1227 | }
|
---|
1228 | #endif
|
---|
1229 |
|
---|
1230 | if (sum < newRenderCost)
|
---|
1231 | {
|
---|
1232 | newRenderCost = sum;
|
---|
1233 |
|
---|
1234 | volBack = volLeft;
|
---|
1235 | volFront = volRight;
|
---|
1236 |
|
---|
1237 | // objects belongs to left side now
|
---|
1238 | for (; backObjectsStart != (cit + 1); ++ backObjectsStart);
|
---|
1239 | }
|
---|
1240 | }
|
---|
1241 |
|
---|
1242 | ////////////////////////////////////////////
|
---|
1243 | //-- assign object to front and back volume
|
---|
1244 |
|
---|
1245 | // belongs to back bv
|
---|
1246 | for (cit = mSubdivisionCandidates->begin(); cit != backObjectsStart; ++ cit)
|
---|
1247 | {
|
---|
1248 | objectsBack.push_back((*cit).mObject);
|
---|
1249 | }
|
---|
1250 | // belongs to front bv
|
---|
1251 | for (cit = backObjectsStart; cit != cit_end; ++ cit)
|
---|
1252 | {
|
---|
1253 | objectsFront.push_back((*cit).mObject);
|
---|
1254 | }
|
---|
1255 |
|
---|
1256 | // render cost of the old parent
|
---|
1257 | const float oldRenderCost = (float)nTotalObjects * totalVol + Limits::Small;
|
---|
1258 | // the relative cost ratio
|
---|
1259 | const float ratio = newRenderCost / oldRenderCost;
|
---|
1260 |
|
---|
1261 | #ifdef GTP_DEBUG
|
---|
1262 | Debug << "\n§§§§ bvh eval const decrease §§§§" << endl
|
---|
1263 | << "back pvs: " << (int)objectsBack.size() << " front pvs: "
|
---|
1264 | << (int)objectsFront.size() << " total pvs: " << nTotalObjects << endl
|
---|
1265 | << "back p: " << volBack / viewSpaceVol << " front p "
|
---|
1266 | << volFront / viewSpaceVol << " p: " << totalVol / viewSpaceVol << endl
|
---|
1267 | << "old rc: " << oldRenderCost / viewSpaceVol << " new rc: "
|
---|
1268 | << newRenderCost / viewSpaceVol << endl
|
---|
1269 | << "render cost decrease: "
|
---|
1270 | << oldRenderCost / viewSpaceVol - newRenderCost / viewSpaceVol << endl;
|
---|
1271 | #endif
|
---|
1272 |
|
---|
1273 | return ratio;
|
---|
1274 | }
|
---|
1275 |
|
---|
1276 |
|
---|
1277 | void BvHierarchy::PrepareLocalSubdivisionCandidates(const BvhTraversalData &tData,
|
---|
1278 | const int axis)
|
---|
1279 | {
|
---|
1280 | //-- insert object queries
|
---|
1281 | ObjectContainer *objects = mUseGlobalSorting ?
|
---|
1282 | tData.mSortedObjects[axis] : &tData.mNode->mObjects;
|
---|
1283 |
|
---|
1284 | CreateLocalSubdivisionCandidates(*objects, &mSubdivisionCandidates, !mUseGlobalSorting, axis);
|
---|
1285 | }
|
---|
1286 |
|
---|
1287 |
|
---|
1288 | void BvHierarchy::CreateLocalSubdivisionCandidates(const ObjectContainer &objects,
|
---|
1289 | SortableEntryContainer **subdivisionCandidates,
|
---|
1290 | const bool sort,
|
---|
1291 | const int axis)
|
---|
1292 | {
|
---|
1293 | (*subdivisionCandidates)->clear();
|
---|
1294 |
|
---|
1295 | // compute requested size and look if subdivision candidate has to be recomputed
|
---|
1296 | const int requestedSize = (int)objects.size() * 2;
|
---|
1297 |
|
---|
1298 | // creates a sorted split candidates array
|
---|
1299 | if ((*subdivisionCandidates)->capacity() > 500000 &&
|
---|
1300 | requestedSize < (int)((*subdivisionCandidates)->capacity() / 10) )
|
---|
1301 | {
|
---|
1302 | delete (*subdivisionCandidates);
|
---|
1303 | (*subdivisionCandidates) = new SortableEntryContainer;
|
---|
1304 | }
|
---|
1305 |
|
---|
1306 | (*subdivisionCandidates)->reserve(requestedSize);
|
---|
1307 |
|
---|
1308 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
1309 |
|
---|
1310 | for (oit = objects.begin(); oit < oit_end; ++ oit)
|
---|
1311 | {
|
---|
1312 | Intersectable *object = *oit;
|
---|
1313 | const AxisAlignedBox3 &box = object->GetBox();
|
---|
1314 | const float midPt = (box.Min(axis) + box.Max(axis)) * 0.5f;
|
---|
1315 |
|
---|
1316 | (*subdivisionCandidates)->push_back(SortableEntry(object, midPt));
|
---|
1317 | }
|
---|
1318 |
|
---|
1319 | if (sort)
|
---|
1320 | { // no presorted candidate list
|
---|
1321 | stable_sort((*subdivisionCandidates)->begin(), (*subdivisionCandidates)->end());
|
---|
1322 | }
|
---|
1323 | }
|
---|
1324 |
|
---|
1325 |
|
---|
1326 | const BvhStatistics &BvHierarchy::GetStatistics() const
|
---|
1327 | {
|
---|
1328 | return mBvhStats;
|
---|
1329 | }
|
---|
1330 |
|
---|
1331 |
|
---|
1332 | float BvHierarchy::PrepareHeuristics(const BvhTraversalData &tData,
|
---|
1333 | const int axis)
|
---|
1334 | {
|
---|
1335 | BvhLeaf *leaf = tData.mNode;
|
---|
1336 | float vol = 0;
|
---|
1337 |
|
---|
1338 | // sort so we can use a sweep from right to left
|
---|
1339 | PrepareLocalSubdivisionCandidates(tData, axis);
|
---|
1340 |
|
---|
1341 | VssRayContainer rays;
|
---|
1342 | // maximal 2 objects share the same ray
|
---|
1343 | rays.reserve(tData.mNumRays * 2);
|
---|
1344 | CollectRays(tData.mNode->mObjects, rays);
|
---|
1345 |
|
---|
1346 | const float prop = (float)mMaxTests / ((float)tData.mNumRays + Limits::Small);
|
---|
1347 |
|
---|
1348 | VssRay::NewMail();
|
---|
1349 |
|
---|
1350 | //cout << "here7 " << tData.mNumRays << " " << rays.size() << endl;
|
---|
1351 | //cout << "here5 prop: " << prop << " " << mMaxTests << " " << tData.mNumRays << endl;
|
---|
1352 | // only use a subset of the rays
|
---|
1353 | VssRayContainer::const_iterator rit, rit_end = rays.end();
|
---|
1354 |
|
---|
1355 | int nRays = 0;
|
---|
1356 |
|
---|
1357 | for (rit = rays.begin(); rit != rit_end; ++ rit)
|
---|
1358 | {
|
---|
1359 | if ((mMaxTests >= (int)rays.size()) || (Random(1.0f) < prop))
|
---|
1360 | {
|
---|
1361 | (*rit)->Mail();
|
---|
1362 | ++ nRays;
|
---|
1363 | }
|
---|
1364 | }
|
---|
1365 |
|
---|
1366 | //cout << "here99 " << nRays << " obj " << tData.mNode->mObjects.size() << endl;
|
---|
1367 | // collect and mark the view cells as belonging to front pvs
|
---|
1368 | ViewCellContainer viewCells;
|
---|
1369 | CollectViewCells(tData.mNode->mObjects, viewCells, true, true);
|
---|
1370 |
|
---|
1371 | ViewCellContainer::const_iterator vit, vit_end = viewCells.end();
|
---|
1372 | for (vit = viewCells.begin(); vit != vit_end; ++ vit)
|
---|
1373 | {
|
---|
1374 | #if USE_VOLUMES_FOR_HEURISTICS
|
---|
1375 | const float volIncr = (*vit)->GetVolume();
|
---|
1376 | #else
|
---|
1377 | const float volIncr = 1.0f;
|
---|
1378 | #endif
|
---|
1379 | vol += volIncr;
|
---|
1380 | }
|
---|
1381 |
|
---|
1382 | // we will mail view cells switching to the back side
|
---|
1383 | ViewCell::NewMail();
|
---|
1384 |
|
---|
1385 | return vol;
|
---|
1386 | }
|
---|
1387 |
|
---|
1388 | ///////////////////////////////////////////////////////////
|
---|
1389 |
|
---|
1390 |
|
---|
1391 | void BvHierarchy::EvalHeuristicsContribution(Intersectable *obj,
|
---|
1392 | float &volLeft,
|
---|
1393 | float &volRight)
|
---|
1394 | {
|
---|
1395 | // collect all view cells associated with this objects
|
---|
1396 | // (also multiple times, if they are pierced by several rays)
|
---|
1397 | ViewCellContainer viewCells;
|
---|
1398 | const bool useMailboxing = false;
|
---|
1399 |
|
---|
1400 | CollectViewCells(obj, viewCells, useMailboxing, false, true);
|
---|
1401 |
|
---|
1402 | // classify view cells and compute volume contri accordingly
|
---|
1403 | // possible view cell classifications:
|
---|
1404 | // view cell mailed => view cell can be seen from left child node
|
---|
1405 | // view cell counter > 0 view cell can be seen from right child node
|
---|
1406 | // combined: view cell volume belongs to both nodes
|
---|
1407 | ViewCellContainer::const_iterator vit, vit_end = viewCells.end();
|
---|
1408 |
|
---|
1409 | for (vit = viewCells.begin(); vit != vit_end; ++ vit)
|
---|
1410 | {
|
---|
1411 | // view cells can also be seen from left child node
|
---|
1412 | ViewCell *viewCell = *vit;
|
---|
1413 | #if USE_VOLUMES_FOR_HEURISTICS
|
---|
1414 | const float vol = viewCell->GetVolume();
|
---|
1415 | #else
|
---|
1416 | const float vol = 1.0f;
|
---|
1417 | #endif
|
---|
1418 | if (!viewCell->Mailed())
|
---|
1419 | {
|
---|
1420 | viewCell->Mail();
|
---|
1421 | // we now see view cell from both nodes
|
---|
1422 | // => add volume to left node
|
---|
1423 | volLeft += vol;
|
---|
1424 | }
|
---|
1425 |
|
---|
1426 | // last reference into the right node
|
---|
1427 | if (-- viewCell->mCounter == 0)
|
---|
1428 | {
|
---|
1429 | // view cell was previously seen from both nodes =>
|
---|
1430 | // remove volume from right node
|
---|
1431 | volRight -= vol;
|
---|
1432 | }
|
---|
1433 | }
|
---|
1434 | }
|
---|
1435 |
|
---|
1436 |
|
---|
1437 | void BvHierarchy::SetViewCellsManager(ViewCellsManager *vcm)
|
---|
1438 | {
|
---|
1439 | mViewCellsManager = vcm;
|
---|
1440 | }
|
---|
1441 |
|
---|
1442 |
|
---|
1443 | AxisAlignedBox3 BvHierarchy::GetBoundingBox() const
|
---|
1444 | {
|
---|
1445 | return mBoundingBox;
|
---|
1446 | }
|
---|
1447 |
|
---|
1448 |
|
---|
1449 | float BvHierarchy::SelectObjectPartition(const BvhTraversalData &tData,
|
---|
1450 | ObjectContainer &frontObjects,
|
---|
1451 | ObjectContainer &backObjects,
|
---|
1452 | bool useVisibilityBasedHeuristics)
|
---|
1453 | {
|
---|
1454 | ObjectContainer nFrontObjects[3];
|
---|
1455 | ObjectContainer nBackObjects[3];
|
---|
1456 | float nCostRatio[3];
|
---|
1457 |
|
---|
1458 | int sAxis = 0;
|
---|
1459 | int bestAxis = -1;
|
---|
1460 |
|
---|
1461 | if (mOnlyDrivingAxis)
|
---|
1462 | {
|
---|
1463 | const AxisAlignedBox3 box = tData.mNode->GetBoundingBox();
|
---|
1464 | sAxis = box.Size().DrivingAxis();
|
---|
1465 | }
|
---|
1466 |
|
---|
1467 | ////////////////////////////////////
|
---|
1468 | //-- evaluate split cost for all three axis
|
---|
1469 |
|
---|
1470 | for (int axis = 0; axis < 3; ++ axis)
|
---|
1471 | {
|
---|
1472 | if (!mOnlyDrivingAxis || (axis == sAxis))
|
---|
1473 | {
|
---|
1474 | if (mUseCostHeuristics)
|
---|
1475 | {
|
---|
1476 | //////////////////////////////////
|
---|
1477 | //-- split objects using heuristics
|
---|
1478 |
|
---|
1479 | if (useVisibilityBasedHeuristics)
|
---|
1480 | {
|
---|
1481 | ///////////
|
---|
1482 | //-- heuristics using objects weighted by view cells volume
|
---|
1483 | nCostRatio[axis] =
|
---|
1484 | EvalLocalCostHeuristics(tData,
|
---|
1485 | axis,
|
---|
1486 | nFrontObjects[axis],
|
---|
1487 | nBackObjects[axis]);
|
---|
1488 | }
|
---|
1489 | else
|
---|
1490 | {
|
---|
1491 | //////////////////
|
---|
1492 | //-- view cells not constructed yet => use surface area heuristic
|
---|
1493 | nCostRatio[axis] = EvalSah(tData,
|
---|
1494 | axis,
|
---|
1495 | nFrontObjects[axis],
|
---|
1496 | nBackObjects[axis]);
|
---|
1497 | }
|
---|
1498 | }
|
---|
1499 | else
|
---|
1500 | {
|
---|
1501 | //-- split objects using some simple criteria
|
---|
1502 | nCostRatio[axis] =
|
---|
1503 | EvalLocalObjectPartition(tData, axis, nFrontObjects[axis], nBackObjects[axis]);
|
---|
1504 | }
|
---|
1505 |
|
---|
1506 | if ((bestAxis == -1) || (nCostRatio[axis] < nCostRatio[bestAxis]))
|
---|
1507 | {
|
---|
1508 | bestAxis = axis;
|
---|
1509 | }
|
---|
1510 | }
|
---|
1511 | }
|
---|
1512 |
|
---|
1513 | ////////////////
|
---|
1514 | //-- assign values
|
---|
1515 |
|
---|
1516 | frontObjects = nFrontObjects[bestAxis];
|
---|
1517 | backObjects = nBackObjects[bestAxis];
|
---|
1518 |
|
---|
1519 | //cout << "val: " << nCostRatio[bestAxis] << " axis: " << bestAxis << endl;
|
---|
1520 | return nCostRatio[bestAxis];
|
---|
1521 | }
|
---|
1522 |
|
---|
1523 |
|
---|
1524 | int BvHierarchy::AssociateObjectsWithRays(const VssRayContainer &rays) const
|
---|
1525 | {
|
---|
1526 | int nRays = 0;
|
---|
1527 | VssRayContainer::const_iterator rit, rit_end = rays.end();
|
---|
1528 |
|
---|
1529 | VssRay::NewMail();
|
---|
1530 |
|
---|
1531 | for (rit = rays.begin(); rit != rays.end(); ++ rit)
|
---|
1532 | {
|
---|
1533 | VssRay *ray = (*rit);
|
---|
1534 |
|
---|
1535 | if (ray->mTerminationObject)
|
---|
1536 | {
|
---|
1537 | ray->mTerminationObject->GetOrCreateRays()->push_back(ray);
|
---|
1538 | if (!ray->Mailed())
|
---|
1539 | {
|
---|
1540 | ray->Mail();
|
---|
1541 | ++ nRays;
|
---|
1542 | }
|
---|
1543 | }
|
---|
1544 | #if COUNT_ORIGIN_OBJECTS
|
---|
1545 | if (ray->mOriginObject)
|
---|
1546 | {
|
---|
1547 | ray->mOriginObject->GetOrCreateRays()->push_back(ray);
|
---|
1548 |
|
---|
1549 | if (!ray->Mailed())
|
---|
1550 | {
|
---|
1551 | ray->Mail();
|
---|
1552 | ++ nRays;
|
---|
1553 | }
|
---|
1554 | }
|
---|
1555 | #endif
|
---|
1556 | }
|
---|
1557 |
|
---|
1558 | return nRays;
|
---|
1559 | }
|
---|
1560 |
|
---|
1561 |
|
---|
1562 | void BvHierarchy::PrintSubdivisionStats(const SubdivisionCandidate &sc)
|
---|
1563 | {
|
---|
1564 | const float costDecr = sc.GetRenderCostDecrease();
|
---|
1565 |
|
---|
1566 | mSubdivisionStats
|
---|
1567 | << "#Leaves\n" << mBvhStats.Leaves() << endl
|
---|
1568 | << "#RenderCostDecrease\n" << costDecr << endl
|
---|
1569 | << "#TotalRenderCost\n" << mTotalCost << endl
|
---|
1570 | << "#EntriesInPvs\n" << mPvsEntries << endl;
|
---|
1571 | }
|
---|
1572 |
|
---|
1573 |
|
---|
1574 | void BvHierarchy::CollectRays(const ObjectContainer &objects,
|
---|
1575 | VssRayContainer &rays) const
|
---|
1576 | {
|
---|
1577 | VssRay::NewMail();
|
---|
1578 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
1579 |
|
---|
1580 | // evaluate reverse pvs and view cell volume on left and right cell
|
---|
1581 | // note: should I take all leaf objects or rather the objects hit by rays?
|
---|
1582 | for (oit = objects.begin(); oit != oit_end; ++ oit)
|
---|
1583 | {
|
---|
1584 | Intersectable *obj = *oit;
|
---|
1585 | VssRayContainer::const_iterator rit, rit_end = obj->GetOrCreateRays()->end();
|
---|
1586 |
|
---|
1587 | for (rit = obj->GetOrCreateRays()->begin(); rit < rit_end; ++ rit)
|
---|
1588 | {
|
---|
1589 | VssRay *ray = (*rit);
|
---|
1590 |
|
---|
1591 | if (!ray->Mailed())
|
---|
1592 | {
|
---|
1593 | ray->Mail();
|
---|
1594 | rays.push_back(ray);
|
---|
1595 | }
|
---|
1596 | }
|
---|
1597 | }
|
---|
1598 | }
|
---|
1599 |
|
---|
1600 |
|
---|
1601 | float BvHierarchy::EvalAbsCost(const ObjectContainer &objects)// const
|
---|
1602 | {
|
---|
1603 | #if USE_BETTER_RENDERCOST_EST
|
---|
1604 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
1605 |
|
---|
1606 | for (oit = objects.begin(); oit != oit_end; ++ oit)
|
---|
1607 | {
|
---|
1608 | objRenderCost += ViewCellsManager::GetRendercost(*oit);
|
---|
1609 | }
|
---|
1610 | #else
|
---|
1611 | return (float)objects.size();
|
---|
1612 | #endif
|
---|
1613 | }
|
---|
1614 |
|
---|
1615 |
|
---|
1616 | float BvHierarchy::EvalSahCost(BvhLeaf *leaf)
|
---|
1617 | {
|
---|
1618 | ////////////////
|
---|
1619 | //-- surface area heuristics
|
---|
1620 | if (leaf->mObjects.empty())
|
---|
1621 | return 0.0f;
|
---|
1622 |
|
---|
1623 | const AxisAlignedBox3 box = GetBoundingBox(leaf);
|
---|
1624 | const float area = box.SurfaceArea();
|
---|
1625 | const float viewSpaceArea = mViewCellsManager->GetViewSpaceBox().SurfaceArea();
|
---|
1626 |
|
---|
1627 | return EvalAbsCost(leaf->mObjects) * area / viewSpaceArea;
|
---|
1628 | }
|
---|
1629 |
|
---|
1630 |
|
---|
1631 | float BvHierarchy::EvalRenderCost(const ObjectContainer &objects) const
|
---|
1632 | {
|
---|
1633 | ///////////////
|
---|
1634 | //-- render cost heuristics
|
---|
1635 |
|
---|
1636 | const float viewSpaceVol = mViewCellsManager->GetViewSpaceBox().GetVolume();
|
---|
1637 |
|
---|
1638 | // probability that view point lies in a view cell which sees this node
|
---|
1639 | const float p = EvalViewCellsVolume(objects) / viewSpaceVol;
|
---|
1640 | const float objRenderCost = EvalAbsCost(objects);
|
---|
1641 |
|
---|
1642 | return objRenderCost * p;
|
---|
1643 | }
|
---|
1644 |
|
---|
1645 |
|
---|
1646 | AxisAlignedBox3 BvHierarchy::EvalBoundingBox(const ObjectContainer &objects,
|
---|
1647 | const AxisAlignedBox3 *parentBox) const
|
---|
1648 | {
|
---|
1649 | // if there are no objects in this box, box size is set to parent box size.
|
---|
1650 | // Question: Invalidate box instead?
|
---|
1651 | if (parentBox && objects.empty())
|
---|
1652 | return *parentBox;
|
---|
1653 |
|
---|
1654 | AxisAlignedBox3 box;
|
---|
1655 | box.Initialize();
|
---|
1656 |
|
---|
1657 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
1658 |
|
---|
1659 | for (oit = objects.begin(); oit != oit_end; ++ oit)
|
---|
1660 | {
|
---|
1661 | Intersectable *obj = *oit;
|
---|
1662 | // grow bounding box to include all objects
|
---|
1663 | box.Include(obj->GetBox());
|
---|
1664 | }
|
---|
1665 |
|
---|
1666 | return box;
|
---|
1667 | }
|
---|
1668 |
|
---|
1669 |
|
---|
1670 | void BvHierarchy::CollectLeaves(BvhNode *root, vector<BvhLeaf *> &leaves) const
|
---|
1671 | {
|
---|
1672 | stack<BvhNode *> nodeStack;
|
---|
1673 | nodeStack.push(root);
|
---|
1674 |
|
---|
1675 | while (!nodeStack.empty())
|
---|
1676 | {
|
---|
1677 | BvhNode *node = nodeStack.top();
|
---|
1678 | nodeStack.pop();
|
---|
1679 |
|
---|
1680 | if (node->IsLeaf())
|
---|
1681 | {
|
---|
1682 | BvhLeaf *leaf = (BvhLeaf *)node;
|
---|
1683 | leaves.push_back(leaf);
|
---|
1684 | }
|
---|
1685 | else
|
---|
1686 | {
|
---|
1687 | BvhInterior *interior = (BvhInterior *)node;
|
---|
1688 |
|
---|
1689 | nodeStack.push(interior->GetBack());
|
---|
1690 | nodeStack.push(interior->GetFront());
|
---|
1691 | }
|
---|
1692 | }
|
---|
1693 | }
|
---|
1694 |
|
---|
1695 |
|
---|
1696 | AxisAlignedBox3 BvHierarchy::GetBoundingBox(BvhNode *node) const
|
---|
1697 | {
|
---|
1698 | return node->GetBoundingBox();
|
---|
1699 | }
|
---|
1700 |
|
---|
1701 |
|
---|
1702 | int BvHierarchy::CollectViewCells(const ObjectContainer &objects,
|
---|
1703 | ViewCellContainer &viewCells,
|
---|
1704 | const bool setCounter,
|
---|
1705 | const bool onlyMailedRays) const
|
---|
1706 | {
|
---|
1707 | ViewCell::NewMail();
|
---|
1708 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
1709 |
|
---|
1710 | int numRays = 0;
|
---|
1711 | // loop through all object and collect view cell pvs of this node
|
---|
1712 | for (oit = objects.begin(); oit != oit_end; ++ oit)
|
---|
1713 | {
|
---|
1714 | // always use only mailed objects
|
---|
1715 | numRays += CollectViewCells(*oit, viewCells, true, setCounter, onlyMailedRays);
|
---|
1716 | }
|
---|
1717 |
|
---|
1718 | return numRays;
|
---|
1719 | }
|
---|
1720 |
|
---|
1721 |
|
---|
1722 | int BvHierarchy::CollectViewCells(Intersectable *obj,
|
---|
1723 | ViewCellContainer &viewCells,
|
---|
1724 | const bool useMailBoxing,
|
---|
1725 | const bool setCounter,
|
---|
1726 | const bool onlyMailedRays) const
|
---|
1727 | {
|
---|
1728 | VssRayContainer::const_iterator rit, rit_end = obj->GetOrCreateRays()->end();
|
---|
1729 |
|
---|
1730 | int numRays = 0;
|
---|
1731 |
|
---|
1732 | for (rit = obj->GetOrCreateRays()->begin(); rit < rit_end; ++ rit)
|
---|
1733 | {
|
---|
1734 | VssRay *ray = (*rit);
|
---|
1735 |
|
---|
1736 | if (onlyMailedRays && !ray->Mailed())
|
---|
1737 | continue;
|
---|
1738 |
|
---|
1739 | //ray->Mail();
|
---|
1740 | ++ numRays;
|
---|
1741 |
|
---|
1742 | ViewCellContainer tmpViewCells;
|
---|
1743 | mHierarchyManager->mVspTree->GetViewCells(*ray, tmpViewCells);
|
---|
1744 |
|
---|
1745 | // matt: probably slow to allocate memory for view cells every time
|
---|
1746 | ViewCellContainer::const_iterator vit, vit_end = tmpViewCells.end();
|
---|
1747 |
|
---|
1748 | for (vit = tmpViewCells.begin(); vit != vit_end; ++ vit)
|
---|
1749 | {
|
---|
1750 | ViewCell *vc = *vit;
|
---|
1751 |
|
---|
1752 | // store view cells
|
---|
1753 | if (!useMailBoxing || !vc->Mailed())
|
---|
1754 | {
|
---|
1755 | if (useMailBoxing)
|
---|
1756 | {
|
---|
1757 | vc->Mail();
|
---|
1758 | if (setCounter)
|
---|
1759 | {
|
---|
1760 | vc->mCounter = 0;
|
---|
1761 | }
|
---|
1762 | }
|
---|
1763 | viewCells.push_back(vc);
|
---|
1764 | }
|
---|
1765 |
|
---|
1766 | if (setCounter)
|
---|
1767 | {
|
---|
1768 | ++ vc->mCounter;
|
---|
1769 | }
|
---|
1770 | }
|
---|
1771 | }
|
---|
1772 |
|
---|
1773 | return numRays;
|
---|
1774 | }
|
---|
1775 |
|
---|
1776 |
|
---|
1777 | int BvHierarchy::CountViewCells(Intersectable *obj) const
|
---|
1778 | {
|
---|
1779 | int result = 0;
|
---|
1780 |
|
---|
1781 | VssRayContainer::const_iterator rit, rit_end = obj->GetOrCreateRays()->end();
|
---|
1782 |
|
---|
1783 | for (rit = obj->GetOrCreateRays()->begin(); rit < rit_end; ++ rit)
|
---|
1784 | {
|
---|
1785 | VssRay *ray = (*rit);
|
---|
1786 | ViewCellContainer tmpViewCells;
|
---|
1787 |
|
---|
1788 | mHierarchyManager->mVspTree->GetViewCells(*ray, tmpViewCells);
|
---|
1789 |
|
---|
1790 | ViewCellContainer::const_iterator vit, vit_end = tmpViewCells.end();
|
---|
1791 | for (vit = tmpViewCells.begin(); vit != vit_end; ++ vit)
|
---|
1792 | {
|
---|
1793 | ViewCell *vc = *vit;
|
---|
1794 |
|
---|
1795 | // store view cells
|
---|
1796 | if (!vc->Mailed())
|
---|
1797 | {
|
---|
1798 | vc->Mail();
|
---|
1799 | ++ result;
|
---|
1800 | }
|
---|
1801 | }
|
---|
1802 | }
|
---|
1803 |
|
---|
1804 | return result;
|
---|
1805 | }
|
---|
1806 |
|
---|
1807 |
|
---|
1808 | int BvHierarchy::CountViewCells(const ObjectContainer &objects) const
|
---|
1809 | {
|
---|
1810 | int nViewCells = 0;
|
---|
1811 | ViewCell::NewMail();
|
---|
1812 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
1813 |
|
---|
1814 | // loop through all object and collect view cell pvs of this node
|
---|
1815 | for (oit = objects.begin(); oit != oit_end; ++ oit)
|
---|
1816 | {
|
---|
1817 | nViewCells += CountViewCells(*oit);
|
---|
1818 | }
|
---|
1819 |
|
---|
1820 | return nViewCells;
|
---|
1821 | }
|
---|
1822 |
|
---|
1823 |
|
---|
1824 | void BvHierarchy::CollectDirtyCandidates(BvhSubdivisionCandidate *sc,
|
---|
1825 | vector<SubdivisionCandidate *> &dirtyList,
|
---|
1826 | const bool onlyUnmailed)
|
---|
1827 | {
|
---|
1828 | BvhTraversalData &tData = sc->mParentData;
|
---|
1829 | BvhLeaf *node = tData.mNode;
|
---|
1830 |
|
---|
1831 | ViewCellContainer viewCells;
|
---|
1832 | ViewCell::NewMail();
|
---|
1833 | int numRays = CollectViewCells(node->mObjects, viewCells, false, false);
|
---|
1834 |
|
---|
1835 | if (0) cout << "collected " << (int)viewCells.size() << " dirty candidates" << endl;
|
---|
1836 |
|
---|
1837 | // split candidates handling
|
---|
1838 | // these view cells are thrown into dirty list
|
---|
1839 | ViewCellContainer::const_iterator vit, vit_end = viewCells.end();
|
---|
1840 |
|
---|
1841 | for (vit = viewCells.begin(); vit != vit_end; ++ vit)
|
---|
1842 | {
|
---|
1843 | VspViewCell *vc = dynamic_cast<VspViewCell *>(*vit);
|
---|
1844 | VspLeaf *leaf = vc->mLeaves[0];
|
---|
1845 |
|
---|
1846 | SubdivisionCandidate *candidate = leaf->GetSubdivisionCandidate();
|
---|
1847 |
|
---|
1848 | // is this leaf still a split candidate?
|
---|
1849 | if (candidate && (!onlyUnmailed || !candidate->Mailed()))
|
---|
1850 | {
|
---|
1851 | candidate->Mail();
|
---|
1852 | candidate->SetDirty(true);
|
---|
1853 | dirtyList.push_back(candidate);
|
---|
1854 | }
|
---|
1855 | }
|
---|
1856 | }
|
---|
1857 |
|
---|
1858 |
|
---|
1859 | BvhNode *BvHierarchy::GetRoot() const
|
---|
1860 | {
|
---|
1861 | return mRoot;
|
---|
1862 | }
|
---|
1863 |
|
---|
1864 |
|
---|
1865 | bool BvHierarchy::IsObjectInLeaf(BvhLeaf *leaf, Intersectable *object) const
|
---|
1866 | {
|
---|
1867 | ObjectContainer::const_iterator oit =
|
---|
1868 | lower_bound(leaf->mObjects.begin(), leaf->mObjects.end(), object, ilt);
|
---|
1869 |
|
---|
1870 | // objects sorted by id
|
---|
1871 | if ((oit != leaf->mObjects.end()) && ((*oit)->GetId() == object->GetId()))
|
---|
1872 | {
|
---|
1873 | return true;
|
---|
1874 | }
|
---|
1875 | else
|
---|
1876 | {
|
---|
1877 | return false;
|
---|
1878 | }
|
---|
1879 | }
|
---|
1880 |
|
---|
1881 |
|
---|
1882 | BvhLeaf *BvHierarchy::GetLeaf(Intersectable *object, BvhNode *node) const
|
---|
1883 | {
|
---|
1884 | // rather use the simple version
|
---|
1885 | if (!object)
|
---|
1886 | return NULL;
|
---|
1887 | return object->mBvhLeaf;
|
---|
1888 |
|
---|
1889 | ///////////////////////////////////////
|
---|
1890 | // start from root of tree
|
---|
1891 |
|
---|
1892 | if (node == NULL)
|
---|
1893 | node = mRoot;
|
---|
1894 |
|
---|
1895 | vector<BvhLeaf *> leaves;
|
---|
1896 |
|
---|
1897 | stack<BvhNode *> nodeStack;
|
---|
1898 | nodeStack.push(node);
|
---|
1899 |
|
---|
1900 | BvhLeaf *leaf = NULL;
|
---|
1901 |
|
---|
1902 | while (!nodeStack.empty())
|
---|
1903 | {
|
---|
1904 | BvhNode *node = nodeStack.top();
|
---|
1905 | nodeStack.pop();
|
---|
1906 |
|
---|
1907 | if (node->IsLeaf())
|
---|
1908 | {
|
---|
1909 | leaf = dynamic_cast<BvhLeaf *>(node);
|
---|
1910 |
|
---|
1911 | if (IsObjectInLeaf(leaf, object))
|
---|
1912 | {
|
---|
1913 | return leaf;
|
---|
1914 | }
|
---|
1915 | }
|
---|
1916 | else
|
---|
1917 | {
|
---|
1918 | // find point
|
---|
1919 | BvhInterior *interior = dynamic_cast<BvhInterior *>(node);
|
---|
1920 |
|
---|
1921 | if (interior->GetBack()->GetBoundingBox().Includes(object->GetBox()))
|
---|
1922 | {
|
---|
1923 | nodeStack.push(interior->GetBack());
|
---|
1924 | }
|
---|
1925 |
|
---|
1926 | // search both sides as we are using bounding volumes
|
---|
1927 | if (interior->GetFront()->GetBoundingBox().Includes(object->GetBox()))
|
---|
1928 | {
|
---|
1929 | nodeStack.push(interior->GetFront());
|
---|
1930 | }
|
---|
1931 | }
|
---|
1932 | }
|
---|
1933 |
|
---|
1934 | return leaf;
|
---|
1935 | }
|
---|
1936 |
|
---|
1937 |
|
---|
1938 | bool BvHierarchy::Export(OUT_STREAM &stream)
|
---|
1939 | {
|
---|
1940 | ExportNode(mRoot, stream);
|
---|
1941 |
|
---|
1942 | return true;
|
---|
1943 | }
|
---|
1944 |
|
---|
1945 |
|
---|
1946 | void BvHierarchy::ExportObjects(BvhLeaf *leaf, OUT_STREAM &stream)
|
---|
1947 | {
|
---|
1948 | ObjectContainer::const_iterator oit, oit_end = leaf->mObjects.end();
|
---|
1949 | for (oit = leaf->mObjects.begin(); oit != oit_end; ++ oit)
|
---|
1950 | {
|
---|
1951 | stream << (*oit)->GetId() << " ";
|
---|
1952 | }
|
---|
1953 | }
|
---|
1954 |
|
---|
1955 |
|
---|
1956 | void BvHierarchy::ExportNode(BvhNode *node, OUT_STREAM &stream)
|
---|
1957 | {
|
---|
1958 | if (node->IsLeaf())
|
---|
1959 | {
|
---|
1960 | BvhLeaf *leaf = dynamic_cast<BvhLeaf *>(node);
|
---|
1961 | const AxisAlignedBox3 box = leaf->GetBoundingBox();
|
---|
1962 | stream << "<Leaf"
|
---|
1963 | << " min=\"" << box.Min().x << " " << box.Min().y << " " << box.Min().z << "\""
|
---|
1964 | << " max=\"" << box.Max().x << " " << box.Max().y << " " << box.Max().z << "\""
|
---|
1965 | << " objects=\"";
|
---|
1966 |
|
---|
1967 | //-- export objects
|
---|
1968 | ExportObjects(leaf, stream);
|
---|
1969 |
|
---|
1970 | stream << "\" />" << endl;
|
---|
1971 | }
|
---|
1972 | else
|
---|
1973 | {
|
---|
1974 | BvhInterior *interior = dynamic_cast<BvhInterior *>(node);
|
---|
1975 | const AxisAlignedBox3 box = interior->GetBoundingBox();
|
---|
1976 |
|
---|
1977 | stream << "<Interior"
|
---|
1978 | << " min=\"" << box.Min().x << " " << box.Min().y << " " << box.Min().z << "\""
|
---|
1979 | << " max=\"" << box.Max().x << " " << box.Max().y << " " << box.Max().z
|
---|
1980 | << "\">" << endl;
|
---|
1981 |
|
---|
1982 | ExportNode(interior->GetBack(), stream);
|
---|
1983 | ExportNode(interior->GetFront(), stream);
|
---|
1984 |
|
---|
1985 | stream << "</Interior>" << endl;
|
---|
1986 | }
|
---|
1987 | }
|
---|
1988 |
|
---|
1989 |
|
---|
1990 | float BvHierarchy::EvalViewCellsVolume(const ObjectContainer &objects) const
|
---|
1991 | {
|
---|
1992 | float vol = 0;
|
---|
1993 |
|
---|
1994 | ViewCellContainer viewCells;
|
---|
1995 |
|
---|
1996 | // we have to account for all view cells that can
|
---|
1997 | // be seen from the objects
|
---|
1998 | int numRays = CollectViewCells(objects, viewCells, false, false);
|
---|
1999 |
|
---|
2000 | ViewCellContainer::const_iterator vit, vit_end = viewCells.end();
|
---|
2001 |
|
---|
2002 | for (vit = viewCells.begin(); vit != vit_end; ++ vit)
|
---|
2003 | {
|
---|
2004 | vol += (*vit)->GetVolume();
|
---|
2005 | }
|
---|
2006 |
|
---|
2007 | return vol;
|
---|
2008 | }
|
---|
2009 |
|
---|
2010 |
|
---|
2011 | void BvHierarchy::Initialise(const ObjectContainer &objects)
|
---|
2012 | {
|
---|
2013 | AxisAlignedBox3 box = EvalBoundingBox(objects);
|
---|
2014 |
|
---|
2015 | ///////
|
---|
2016 | //-- create new root
|
---|
2017 |
|
---|
2018 | BvhLeaf *bvhleaf = new BvhLeaf(box, NULL, (int)objects.size());
|
---|
2019 | bvhleaf->mObjects = objects;
|
---|
2020 | mRoot = bvhleaf;
|
---|
2021 |
|
---|
2022 | // compute bounding box from objects
|
---|
2023 | mBoundingBox = mRoot->GetBoundingBox();
|
---|
2024 |
|
---|
2025 | // associate root with current objects
|
---|
2026 | AssociateObjectsWithLeaf(bvhleaf);
|
---|
2027 | }
|
---|
2028 |
|
---|
2029 |
|
---|
2030 | /*
|
---|
2031 | Mesh *BvHierarchy::MergeLeafToMesh()
|
---|
2032 | {
|
---|
2033 | vector<BvhLeaf *> leaves;
|
---|
2034 | CollectLeaves(leaves);
|
---|
2035 |
|
---|
2036 | vector<BvhLeaf *>::const_iterator lit, lit_end = leaves.end();
|
---|
2037 |
|
---|
2038 | for (lit = leaves.begin(); lit != lit_end; ++ lit)
|
---|
2039 | {
|
---|
2040 | Mesh *mesh = MergeLeafToMesh(*lit);
|
---|
2041 | }
|
---|
2042 | }*/
|
---|
2043 |
|
---|
2044 |
|
---|
2045 | SubdivisionCandidate *BvHierarchy::PrepareConstruction(const VssRayContainer &sampleRays,
|
---|
2046 | const ObjectContainer &objects)
|
---|
2047 | {
|
---|
2048 | ///////////////////////////////////////
|
---|
2049 | //-- we assume that we have objects sorted by their id =>
|
---|
2050 | //-- we don't have to sort them here and an binary search
|
---|
2051 | //-- for identifying if a object is in a leaf.
|
---|
2052 |
|
---|
2053 | mBvhStats.Reset();
|
---|
2054 | mBvhStats.Start();
|
---|
2055 | mBvhStats.nodes = 1;
|
---|
2056 |
|
---|
2057 | // store pointer to this tree
|
---|
2058 | BvhSubdivisionCandidate::sBvHierarchy = this;
|
---|
2059 |
|
---|
2060 | // root and bounding box was already constructed
|
---|
2061 | BvhLeaf *bvhLeaf = dynamic_cast<BvhLeaf *>(mRoot);
|
---|
2062 |
|
---|
2063 | // multiply termination criterium for comparison,
|
---|
2064 | // so it can be set between zero and one and
|
---|
2065 | // no division is necessary during traversal
|
---|
2066 |
|
---|
2067 | #if PROBABILIY_IS_BV_VOLUME
|
---|
2068 | mTermMinProbability *= mBoundingBox.GetVolume();
|
---|
2069 | // probability that bounding volume is seen
|
---|
2070 | const float prop = GetBoundingBox().GetVolume();
|
---|
2071 | #else
|
---|
2072 | mTermMinProbability *= mVspTree->GetBoundingBox().GetVolume();
|
---|
2073 | // probability that volume is "seen" from the view cells
|
---|
2074 | const float prop = EvalViewCellsVolume(objects);
|
---|
2075 | #endif
|
---|
2076 |
|
---|
2077 | // only rays intersecting objects in node are interesting
|
---|
2078 | const int nRays = AssociateObjectsWithRays(sampleRays);
|
---|
2079 | //Debug << "using " << nRays << " of " << (int)sampleRays.size() << " rays" << endl;
|
---|
2080 |
|
---|
2081 | // create bvh traversal data
|
---|
2082 | BvhTraversalData oData(bvhLeaf, 0, prop, nRays);
|
---|
2083 |
|
---|
2084 | // create sorted object lists for the first data
|
---|
2085 | if (mUseGlobalSorting)
|
---|
2086 | {
|
---|
2087 | AssignInitialSortedObjectList(oData);
|
---|
2088 | }
|
---|
2089 |
|
---|
2090 |
|
---|
2091 | ///////////////////
|
---|
2092 | //-- add first candidate for object space partition
|
---|
2093 |
|
---|
2094 | BvhSubdivisionCandidate *oSubdivisionCandidate = new BvhSubdivisionCandidate(oData);
|
---|
2095 |
|
---|
2096 | // evaluate priority
|
---|
2097 | EvalSubdivisionCandidate(*oSubdivisionCandidate);
|
---|
2098 | bvhLeaf->SetSubdivisionCandidate(oSubdivisionCandidate);
|
---|
2099 |
|
---|
2100 | mTotalCost = EvalRenderCost(objects);
|
---|
2101 | mPvsEntries = CountViewCells(objects);
|
---|
2102 |
|
---|
2103 | PrintSubdivisionStats(*oSubdivisionCandidate);
|
---|
2104 |
|
---|
2105 | return oSubdivisionCandidate;
|
---|
2106 | }
|
---|
2107 |
|
---|
2108 |
|
---|
2109 | void BvHierarchy::AssignInitialSortedObjectList(BvhTraversalData &tData)
|
---|
2110 | {
|
---|
2111 | // we sort the objects as a preprocess so they don't have
|
---|
2112 | // to be sorted for each split
|
---|
2113 | for (int i = 0; i < 3; ++ i)
|
---|
2114 | {
|
---|
2115 | // create new objects
|
---|
2116 | if (!mSortedObjects[i])
|
---|
2117 | {
|
---|
2118 | mSortedObjects[i] = new SortableEntryContainer();
|
---|
2119 | CreateLocalSubdivisionCandidates(tData.mNode->mObjects, &mSortedObjects[i], true, i);
|
---|
2120 | }
|
---|
2121 |
|
---|
2122 | // copy list into traversal data list
|
---|
2123 | tData.mSortedObjects[i] = new ObjectContainer();
|
---|
2124 | tData.mSortedObjects[i]->reserve((int)mSortedObjects[i]->size());
|
---|
2125 |
|
---|
2126 | SortableEntryContainer::const_iterator oit, oit_end = mSortedObjects[i]->end();
|
---|
2127 |
|
---|
2128 | for (oit = mSortedObjects[i]->begin(); oit != oit_end; ++ oit)
|
---|
2129 | {
|
---|
2130 | tData.mSortedObjects[i]->push_back((*oit).mObject);
|
---|
2131 | }
|
---|
2132 | }
|
---|
2133 | }
|
---|
2134 |
|
---|
2135 |
|
---|
2136 | void BvHierarchy::AssignSortedObjects(const BvhSubdivisionCandidate &sc,
|
---|
2137 | BvhTraversalData &frontData,
|
---|
2138 | BvhTraversalData &backData)
|
---|
2139 | {
|
---|
2140 | Intersectable::NewMail();
|
---|
2141 |
|
---|
2142 | // we sorted the objects as a preprocess so they don't have
|
---|
2143 | // to be sorted for each split
|
---|
2144 | ObjectContainer::const_iterator fit, fit_end = sc.mFrontObjects.end();
|
---|
2145 |
|
---|
2146 | for (fit = sc.mFrontObjects.begin(); fit != fit_end; ++ fit)
|
---|
2147 | {
|
---|
2148 | (*fit)->Mail();
|
---|
2149 | }
|
---|
2150 |
|
---|
2151 | for (int i = 0; i < 3; ++ i)
|
---|
2152 | {
|
---|
2153 | frontData.mSortedObjects[i] = new ObjectContainer();
|
---|
2154 | backData.mSortedObjects[i] = new ObjectContainer();
|
---|
2155 |
|
---|
2156 | frontData.mSortedObjects[i]->reserve((int)sc.mFrontObjects.size());
|
---|
2157 | backData.mSortedObjects[i]->reserve((int)sc.mFrontObjects.size());
|
---|
2158 |
|
---|
2159 | ObjectContainer::const_iterator oit, oit_end = sc.mParentData.mSortedObjects[i]->end();
|
---|
2160 |
|
---|
2161 | for (oit = sc.mParentData.mSortedObjects[i]->begin(); oit != oit_end; ++ oit)
|
---|
2162 | {
|
---|
2163 | if ((*oit)->Mailed())
|
---|
2164 | {
|
---|
2165 | frontData.mSortedObjects[i]->push_back(*oit);
|
---|
2166 | }
|
---|
2167 | else
|
---|
2168 | {
|
---|
2169 | backData.mSortedObjects[i]->push_back(*oit);
|
---|
2170 | }
|
---|
2171 | }
|
---|
2172 | }
|
---|
2173 | }
|
---|
2174 |
|
---|
2175 |
|
---|
2176 | SubdivisionCandidate *BvHierarchy::Reset(const VssRayContainer &sampleRays,
|
---|
2177 | const ObjectContainer &objects)
|
---|
2178 | {
|
---|
2179 | // reset stats
|
---|
2180 | mBvhStats.Reset();
|
---|
2181 | mBvhStats.Start();
|
---|
2182 | mBvhStats.nodes = 1;
|
---|
2183 |
|
---|
2184 | // reset root
|
---|
2185 | DEL_PTR(mRoot);
|
---|
2186 |
|
---|
2187 | BvhLeaf *bvhleaf = new BvhLeaf(mBoundingBox, NULL, (int)objects.size());
|
---|
2188 | bvhleaf->mObjects = objects;
|
---|
2189 | mRoot = bvhleaf;
|
---|
2190 |
|
---|
2191 | #if PROBABILIY_IS_BV_VOLUME
|
---|
2192 | mTermMinProbability *= mBoundingBox.GetVolume();
|
---|
2193 | // probability that bounding volume is seen
|
---|
2194 | const float prop = GetBoundingBox().GetVolume();
|
---|
2195 | #else
|
---|
2196 | mTermMinProbability *= mVspTree->GetBoundingBox().GetVolume();
|
---|
2197 | // probability that volume is "seen" from the view cells
|
---|
2198 | const float prop = EvalViewCellsVolume(objects);
|
---|
2199 | #endif
|
---|
2200 |
|
---|
2201 | const int nRays = CountRays(objects);
|
---|
2202 | BvhLeaf *bvhLeaf = dynamic_cast<BvhLeaf *>(mRoot);
|
---|
2203 |
|
---|
2204 | // create bvh traversal data
|
---|
2205 | BvhTraversalData oData(bvhLeaf, 0, prop, nRays);
|
---|
2206 |
|
---|
2207 | AssignInitialSortedObjectList(oData);
|
---|
2208 |
|
---|
2209 |
|
---|
2210 | ///////////////////
|
---|
2211 | //-- add first candidate for object space partition
|
---|
2212 |
|
---|
2213 | BvhSubdivisionCandidate *oSubdivisionCandidate =
|
---|
2214 | new BvhSubdivisionCandidate(oData);
|
---|
2215 |
|
---|
2216 | EvalSubdivisionCandidate(*oSubdivisionCandidate);
|
---|
2217 | bvhLeaf->SetSubdivisionCandidate(oSubdivisionCandidate);
|
---|
2218 |
|
---|
2219 | const float viewSpaceVol = mViewCellsManager->GetViewSpaceBox().GetVolume();
|
---|
2220 | mTotalCost = (float)objects.size() * prop / viewSpaceVol;
|
---|
2221 |
|
---|
2222 | PrintSubdivisionStats(*oSubdivisionCandidate);
|
---|
2223 |
|
---|
2224 | return oSubdivisionCandidate;
|
---|
2225 | }
|
---|
2226 |
|
---|
2227 |
|
---|
2228 | void BvhStatistics::Print(ostream &app) const
|
---|
2229 | {
|
---|
2230 | app << "=========== BvHierarchy statistics ===============\n";
|
---|
2231 |
|
---|
2232 | app << setprecision(4);
|
---|
2233 |
|
---|
2234 | app << "#N_CTIME ( Construction time [s] )\n" << Time() << " \n";
|
---|
2235 |
|
---|
2236 | app << "#N_NODES ( Number of nodes )\n" << nodes << "\n";
|
---|
2237 |
|
---|
2238 | app << "#N_INTERIORS ( Number of interior nodes )\n" << Interior() << "\n";
|
---|
2239 |
|
---|
2240 | app << "#N_LEAVES ( Number of leaves )\n" << Leaves() << "\n";
|
---|
2241 |
|
---|
2242 | app << "#AXIS_ALIGNED_SPLITS (number of axis aligned splits)\n" << splits << endl;
|
---|
2243 |
|
---|
2244 | app << "#N_MAXCOSTNODES ( Percentage of leaves with terminated because of max cost ratio )\n"
|
---|
2245 | << maxCostNodes * 100 / (double)Leaves() << endl;
|
---|
2246 |
|
---|
2247 | app << "#N_PMINPROBABILITYLEAVES ( Percentage of leaves with mininum probability )\n"
|
---|
2248 | << minProbabilityNodes * 100 / (double)Leaves() << endl;
|
---|
2249 |
|
---|
2250 |
|
---|
2251 | //////////////////////////////////////////////////
|
---|
2252 |
|
---|
2253 | app << "#N_PMAXDEPTHLEAVES ( Percentage of leaves at maximum depth )\n"
|
---|
2254 | << maxDepthNodes * 100 / (double)Leaves() << endl;
|
---|
2255 |
|
---|
2256 | app << "#N_PMAXDEPTH ( Maximal reached depth )\n" << maxDepth << endl;
|
---|
2257 |
|
---|
2258 | app << "#N_PMINDEPTH ( Minimal reached depth )\n" << minDepth << endl;
|
---|
2259 |
|
---|
2260 | app << "#AVGDEPTH ( average depth )\n" << AvgDepth() << endl;
|
---|
2261 |
|
---|
2262 |
|
---|
2263 | ////////////////////////////////////////////////////////
|
---|
2264 |
|
---|
2265 | app << "#N_PMINOBJECTSLEAVES ( Percentage of leaves with mininum objects )\n"
|
---|
2266 | << minObjectsNodes * 100 / (double)Leaves() << endl;
|
---|
2267 |
|
---|
2268 | app << "#N_MAXOBJECTREFS ( Max number of object refs / leaf )\n" << maxObjectRefs << "\n";
|
---|
2269 |
|
---|
2270 | app << "#N_MINOBJECTREFS ( Min number of object refs / leaf )\n" << minObjectRefs << "\n";
|
---|
2271 |
|
---|
2272 | app << "#N_EMPTYLEAFS ( Empty leafs )\n" << emptyNodes << "\n";
|
---|
2273 |
|
---|
2274 | app << "#N_PAVGOBJECTSLEAVES ( average object refs / leaf)\n" << AvgObjectRefs() << endl;
|
---|
2275 |
|
---|
2276 |
|
---|
2277 | ////////////////////////////////////////////////////////
|
---|
2278 |
|
---|
2279 | app << "#N_PMINRAYSLEAVES ( Percentage of leaves with mininum rays )\n"
|
---|
2280 | << minRaysNodes * 100 / (double)Leaves() << endl;
|
---|
2281 |
|
---|
2282 | app << "#N_MAXRAYREFS ( Max number of ray refs / leaf )\n" << maxRayRefs << "\n";
|
---|
2283 |
|
---|
2284 | app << "#N_MINRAYREFS ( Min number of ray refs / leaf )\n" << minRayRefs << "\n";
|
---|
2285 |
|
---|
2286 | app << "#N_PAVGRAYLEAVES ( average ray refs / leaf )\n" << AvgRayRefs() << endl;
|
---|
2287 |
|
---|
2288 | app << "#N_PAVGRAYCONTRIBLEAVES ( Average ray contribution)\n" <<
|
---|
2289 | rayRefs / (double)objectRefs << endl;
|
---|
2290 |
|
---|
2291 | app << "#N_PMAXRAYCONTRIBLEAVES ( Percentage of leaves with maximal ray contribution )\n"<<
|
---|
2292 | maxRayContriNodes * 100 / (double)Leaves() << endl;
|
---|
2293 |
|
---|
2294 | app << "#N_PGLOBALCOSTMISSES ( Global cost misses )\n" << mGlobalCostMisses << endl;
|
---|
2295 |
|
---|
2296 | app << "========== END OF BvHierarchy statistics ==========\n";
|
---|
2297 | }
|
---|
2298 |
|
---|
2299 |
|
---|
2300 | // TODO: return memory usage in MB
|
---|
2301 | float BvHierarchy::GetMemUsage() const
|
---|
2302 | {
|
---|
2303 | return (float)(sizeof(BvHierarchy)
|
---|
2304 | + mBvhStats.Leaves() * sizeof(BvhLeaf)
|
---|
2305 | + mBvhStats.Interior() * sizeof(BvhInterior)
|
---|
2306 | ) / float(1024 * 1024);
|
---|
2307 | }
|
---|
2308 |
|
---|
2309 |
|
---|
2310 | void BvHierarchy::SetActive(BvhNode *node) const
|
---|
2311 | {
|
---|
2312 | vector<BvhLeaf *> leaves;
|
---|
2313 |
|
---|
2314 | // sets the pointers to the currently active view cells
|
---|
2315 | CollectLeaves(node, leaves);
|
---|
2316 | vector<BvhLeaf *>::const_iterator lit, lit_end = leaves.end();
|
---|
2317 |
|
---|
2318 | for (lit = leaves.begin(); lit != lit_end; ++ lit)
|
---|
2319 | {
|
---|
2320 | (*lit)->SetActiveNode(node);
|
---|
2321 | }
|
---|
2322 | }
|
---|
2323 |
|
---|
2324 |
|
---|
2325 | BvhNode *BvHierarchy::SubdivideAndCopy(SplitQueue &tQueue,
|
---|
2326 | SubdivisionCandidate *splitCandidate)
|
---|
2327 | {
|
---|
2328 | BvhSubdivisionCandidate *sc =
|
---|
2329 | dynamic_cast<BvhSubdivisionCandidate *>(splitCandidate);
|
---|
2330 | BvhTraversalData &tData = sc->mParentData;
|
---|
2331 |
|
---|
2332 | BvhNode *currentNode = tData.mNode;
|
---|
2333 | BvhNode *oldNode = (BvhNode *)splitCandidate->mEvaluationHack;
|
---|
2334 |
|
---|
2335 | if (!oldNode->IsLeaf())
|
---|
2336 | {
|
---|
2337 | //////////////
|
---|
2338 | //-- continue subdivision
|
---|
2339 |
|
---|
2340 | BvhTraversalData tFrontData;
|
---|
2341 | BvhTraversalData tBackData;
|
---|
2342 |
|
---|
2343 | BvhInterior *oldInterior = dynamic_cast<BvhInterior *>(oldNode);
|
---|
2344 |
|
---|
2345 | sc->mFrontObjects.clear();
|
---|
2346 | sc->mBackObjects.clear();
|
---|
2347 |
|
---|
2348 | oldInterior->GetFront()->CollectObjects(sc->mFrontObjects);
|
---|
2349 | oldInterior->GetBack()->CollectObjects(sc->mBackObjects);
|
---|
2350 |
|
---|
2351 | // evaluate the changes in render cost and pvs entries
|
---|
2352 | EvalSubdivisionCandidate(*sc, false);
|
---|
2353 |
|
---|
2354 | // create new interior node and two leaf node
|
---|
2355 | currentNode = SubdivideNode(*sc, tFrontData, tBackData);
|
---|
2356 |
|
---|
2357 | //oldNode->mRenderCostDecr += sc->GetRenderCostDecrease();
|
---|
2358 | //oldNode->mPvsEntriesIncr += sc->GetPvsEntriesIncr();
|
---|
2359 |
|
---|
2360 | //oldNode->mRenderCostDecr = sc->GetRenderCostDecrease();
|
---|
2361 | //oldNode->mPvsEntriesIncr = sc->GetPvsEntriesIncr();
|
---|
2362 |
|
---|
2363 | ///////////////////////////
|
---|
2364 | //-- push the new split candidates on the queue
|
---|
2365 |
|
---|
2366 | BvhSubdivisionCandidate *frontCandidate = new BvhSubdivisionCandidate(tFrontData);
|
---|
2367 | BvhSubdivisionCandidate *backCandidate = new BvhSubdivisionCandidate(tBackData);
|
---|
2368 |
|
---|
2369 | frontCandidate->SetPriority((float)-oldInterior->GetFront()->GetTimeStamp());
|
---|
2370 | backCandidate->SetPriority((float)-oldInterior->GetBack()->GetTimeStamp());
|
---|
2371 |
|
---|
2372 | frontCandidate->mEvaluationHack = oldInterior->GetFront();
|
---|
2373 | backCandidate->mEvaluationHack = oldInterior->GetBack();
|
---|
2374 |
|
---|
2375 | // cross reference
|
---|
2376 | tFrontData.mNode->SetSubdivisionCandidate(frontCandidate);
|
---|
2377 | tBackData.mNode->SetSubdivisionCandidate(backCandidate);
|
---|
2378 |
|
---|
2379 | //cout << "f: " << frontCandidate->GetPriority() << " b: " << backCandidate->GetPriority() << endl;
|
---|
2380 | tQueue.Push(frontCandidate);
|
---|
2381 | tQueue.Push(backCandidate);
|
---|
2382 | }
|
---|
2383 |
|
---|
2384 | /////////////////////////////////
|
---|
2385 | //-- node is a leaf => terminate traversal
|
---|
2386 |
|
---|
2387 | if (currentNode->IsLeaf())
|
---|
2388 | {
|
---|
2389 | // this leaf is no candidate for splitting anymore
|
---|
2390 | // => detach subdivision candidate
|
---|
2391 | tData.mNode->SetSubdivisionCandidate(NULL);
|
---|
2392 | // detach node so we don't delete it with the traversal data
|
---|
2393 | tData.mNode = NULL;
|
---|
2394 | }
|
---|
2395 |
|
---|
2396 | return currentNode;
|
---|
2397 | }
|
---|
2398 |
|
---|
2399 |
|
---|
2400 | void BvHierarchy::CollectObjects(const AxisAlignedBox3 &box, ObjectContainer &objects)
|
---|
2401 | {
|
---|
2402 | stack<BvhNode *> nodeStack;
|
---|
2403 |
|
---|
2404 | nodeStack.push(mRoot);
|
---|
2405 |
|
---|
2406 | while (!nodeStack.empty())
|
---|
2407 | {
|
---|
2408 | BvhNode *node = nodeStack.top();
|
---|
2409 |
|
---|
2410 | nodeStack.pop();
|
---|
2411 |
|
---|
2412 | if (node->IsLeaf())
|
---|
2413 | {
|
---|
2414 | BvhLeaf *leaf = (BvhLeaf *)node;
|
---|
2415 | if (Overlap(box, leaf->GetBoundingBox())) {
|
---|
2416 | Intersectable *object = leaf;
|
---|
2417 | if (!object->Mailed()) {
|
---|
2418 | object->Mail();
|
---|
2419 | objects.push_back(object);
|
---|
2420 | }
|
---|
2421 | }
|
---|
2422 | }
|
---|
2423 | else
|
---|
2424 | {
|
---|
2425 | BvhInterior *interior = (BvhInterior *)node;
|
---|
2426 |
|
---|
2427 | if (Overlap(box, interior->GetBoundingBox()))
|
---|
2428 | nodeStack.push(interior->GetFront());
|
---|
2429 |
|
---|
2430 | if (Overlap(box, interior->GetBoundingBox()))
|
---|
2431 | nodeStack.push(interior->GetBack());
|
---|
2432 | }
|
---|
2433 | }
|
---|
2434 | }
|
---|
2435 |
|
---|
2436 | }
|
---|