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 | #define TEST_POWERPLANT 0
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29 |
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30 |
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31 | //int BvhNode::sMailId = 10000;
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32 | //int BvhNode::sReservedMailboxes = 1;
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33 |
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34 | BvHierarchy *BvHierarchy::BvhSubdivisionCandidate::sBvHierarchy = NULL;
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35 |
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36 |
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37 | /// sorting operator
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38 | inline static bool ilt(Intersectable *obj1, Intersectable *obj2)
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39 | {
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40 | return obj1->mId < obj2->mId;
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41 | }
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42 |
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43 |
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44 | /// sorting operator
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45 | inline static bool smallerSize(Intersectable *obj1, Intersectable *obj2)
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46 | {
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47 | return obj1->GetBox().SurfaceArea() < obj2->GetBox().SurfaceArea();
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48 | }
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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 | /* class BvhNode implementation */
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54 | /***************************************************************/
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55 |
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56 | BvhNode::BvhNode():
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57 | mParent(NULL),
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58 | mTimeStamp(0),
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59 | mRenderCost(-1)
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60 |
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61 | {
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62 |
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63 | }
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64 |
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65 | BvhNode::BvhNode(const AxisAlignedBox3 &bbox):
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66 | mParent(NULL),
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67 | mBoundingBox(bbox),
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68 | mTimeStamp(0),
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69 | mRenderCost(-1)
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70 | {
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71 | }
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72 |
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73 |
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74 | BvhNode::BvhNode(const AxisAlignedBox3 &bbox, BvhInterior *parent):
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75 | mBoundingBox(bbox),
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76 | mParent(parent),
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77 | mTimeStamp(0),
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78 | mRenderCost(-1)
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79 | {
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80 | }
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81 |
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82 |
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83 | bool BvhNode::IsRoot() const
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84 | {
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85 | return mParent == NULL;
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86 | }
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87 |
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88 |
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89 | BvhInterior *BvhNode::GetParent()
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90 | {
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91 | return mParent;
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92 | }
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93 |
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94 |
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95 | void BvhNode::SetParent(BvhInterior *parent)
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96 | {
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97 | mParent = parent;
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98 | }
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99 |
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100 |
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101 | int BvhNode::GetRandomEdgePoint(Vector3 &point,
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102 | Vector3 &normal)
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103 | {
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104 | // get random edge
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105 | const int idx = Random(12);
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106 | Vector3 a, b;
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107 | mBoundingBox.GetEdge(idx, &a, &b);
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108 |
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109 | const float w = RandomValue(0.0f, 1.0f);
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110 |
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111 | point = a * w + b * (1.0f - w);
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112 |
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113 | // TODO
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114 | normal = Vector3(0);
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115 |
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116 | return idx;
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117 | }
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118 |
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119 |
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120 |
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121 | /******************************************************************/
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122 | /* class BvhInterior implementation */
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123 | /******************************************************************/
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124 |
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125 |
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126 | BvhLeaf::BvhLeaf(const AxisAlignedBox3 &bbox):
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127 | BvhNode(bbox),
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128 | mSubdivisionCandidate(NULL),
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129 | mGlList(0)
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130 | {
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131 | mActiveNode = this;
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132 | }
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133 |
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134 |
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135 | BvhLeaf::BvhLeaf(const AxisAlignedBox3 &bbox, BvhInterior *parent):
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136 | BvhNode(bbox, parent),
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137 | mGlList(0)
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138 |
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139 | {
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140 | mActiveNode = this;
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141 | }
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142 |
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143 |
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144 | BvhLeaf::BvhLeaf(const AxisAlignedBox3 &bbox,
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145 | BvhInterior *parent,
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146 | const int numObjects):
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147 | BvhNode(bbox, parent),
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148 | mGlList(0)
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149 |
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150 | {
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151 | mObjects.reserve(numObjects);
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152 | mActiveNode = this;
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153 | }
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154 |
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155 |
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156 | bool BvhLeaf::IsLeaf() const
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157 | {
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158 | return true;
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159 | }
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160 |
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161 |
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162 | BvhLeaf::~BvhLeaf()
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163 | {
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164 | }
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165 |
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166 |
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167 | void BvhLeaf::CollectObjects(ObjectContainer &objects)
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168 | {
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169 | ObjectContainer::const_iterator oit, oit_end = mObjects.end();
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170 | for (oit = mObjects.begin(); oit != oit_end; ++ oit)
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171 | {
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172 | objects.push_back(*oit);
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173 | }
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174 | }
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175 |
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176 |
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177 |
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178 | /******************************************************************/
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179 | /* class BvhInterior implementation */
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180 | /******************************************************************/
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181 |
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182 |
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183 | BvhInterior::BvhInterior(const AxisAlignedBox3 &bbox):
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184 | BvhNode(bbox), mFront(NULL), mBack(NULL)
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185 | {
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186 | }
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187 |
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188 |
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189 | BvhInterior::BvhInterior(const AxisAlignedBox3 &bbox, BvhInterior *parent):
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190 | BvhNode(bbox, parent), mFront(NULL), mBack(NULL)
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191 | {
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192 | }
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193 |
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194 |
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195 | void BvhInterior::ReplaceChildLink(BvhNode *oldChild, BvhNode *newChild)
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196 | {
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197 | if (mBack == oldChild)
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198 | mBack = newChild;
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199 | else
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200 | mFront = newChild;
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201 | }
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202 |
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203 |
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204 | bool BvhInterior::IsLeaf() const
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205 | {
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206 | return false;
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207 | }
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208 |
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209 |
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210 | BvhInterior::~BvhInterior()
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211 | {
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212 | DEL_PTR(mFront);
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213 | DEL_PTR(mBack);
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214 | }
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215 |
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216 |
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217 | void BvhInterior::SetupChildLinks(BvhNode *front, BvhNode *back)
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218 | {
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219 | mBack = back;
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220 | mFront = front;
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221 | }
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222 |
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223 |
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224 | void BvhInterior::CollectObjects(ObjectContainer &objects)
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225 | {
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226 | mFront->CollectObjects(objects);
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227 | mBack->CollectObjects(objects);
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228 | }
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229 |
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230 |
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231 | /*******************************************************************/
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232 | /* class BvHierarchy implementation */
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233 | /*******************************************************************/
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234 |
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235 |
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236 | BvHierarchy::BvHierarchy():
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237 | mRoot(NULL),
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238 | mTimeStamp(1),
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239 | mIsInitialSubdivision(false)
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240 | {
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241 | ReadEnvironment();
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242 | mSubdivisionCandidates = new SortableEntryContainer;
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243 | // for (int i = 0; i < 4; ++ i)
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244 | // mSortedObjects[i] = NULL;
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245 | }
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246 |
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247 |
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248 | BvHierarchy::~BvHierarchy()
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249 | {
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250 | // delete the local subdivision candidates
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251 | DEL_PTR(mSubdivisionCandidates);
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252 |
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253 | // delete the presorted objects
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254 | /*for (int i = 0; i < 4; ++ i)
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255 | {
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256 | DEL_PTR(mSortedObjects[i]);
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257 | }*/
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258 |
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259 | // delete the tree
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260 | DEL_PTR(mRoot);
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261 | }
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262 |
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263 |
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264 | void BvHierarchy::ReadEnvironment()
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265 | {
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266 | bool randomize = false;
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267 | Environment::GetSingleton()->GetBoolValue("BvHierarchy.Construction.randomize", randomize);
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268 |
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269 | // initialise random generator for heuristics
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270 | if (randomize)
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271 | Randomize();
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272 |
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273 | //////////////////////////////
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274 | //-- termination criteria for autopartition
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275 |
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276 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.maxDepth", mTermMaxDepth);
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277 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.maxLeaves", mTermMaxLeaves);
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278 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.minObjects", mTermMinObjects);
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279 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.minRays", mTermMinRays);
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280 | Environment::GetSingleton()->GetFloatValue("BvHierarchy.Termination.minProbability", mTermMinProbability);
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281 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.missTolerance", mTermMissTolerance);
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282 |
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283 |
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284 | //////////////////////////////
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285 | //-- max cost ratio for early tree termination
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286 |
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287 | Environment::GetSingleton()->GetFloatValue("BvHierarchy.Termination.maxCostRatio", mTermMaxCostRatio);
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288 | Environment::GetSingleton()->GetFloatValue("BvHierarchy.Termination.minGlobalCostRatio",
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289 | mTermMinGlobalCostRatio);
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290 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.globalCostMissTolerance",
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291 | mTermGlobalCostMissTolerance);
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292 |
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293 |
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294 | //////////////////////////////
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295 | //-- factors for subdivision heuristics
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296 |
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297 | // if only the driving axis is used for splits
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298 | Environment::GetSingleton()->GetBoolValue("BvHierarchy.splitUseOnlyDrivingAxis", mOnlyDrivingAxis);
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299 | Environment::GetSingleton()->GetFloatValue("BvHierarchy.maxStaticMemory", mMaxMemory);
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300 | Environment::GetSingleton()->GetBoolValue("BvHierarchy.useCostHeuristics", mUseCostHeuristics);
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301 | Environment::GetSingleton()->GetBoolValue("BvHierarchy.useSah", mUseSah);
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302 |
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303 | char subdivisionStatsLog[100];
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304 | Environment::GetSingleton()->GetStringValue("BvHierarchy.subdivisionStats", subdivisionStatsLog);
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305 | mSubdivisionStats.open(subdivisionStatsLog);
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306 |
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307 | Environment::GetSingleton()->GetFloatValue("BvHierarchy.Construction.renderCostDecreaseWeight", mRenderCostDecreaseWeight);
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308 | Environment::GetSingleton()->GetBoolValue("BvHierarchy.Construction.useGlobalSorting", mUseGlobalSorting);
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309 | Environment::GetSingleton()->GetIntValue("BvHierarchy.minRaysForVisibility", mMinRaysForVisibility);
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310 | Environment::GetSingleton()->GetIntValue("BvHierarchy.maxTests", mMaxTests);
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311 | Environment::GetSingleton()->GetBoolValue("BvHierarchy.Construction.useInitialSubdivision", mApplyInitialPartition);
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312 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Construction.Initial.minObjects", mInitialMinObjects);
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313 | Environment::GetSingleton()->GetFloatValue("BvHierarchy.Construction.Initial.maxAreaRatio", mInitialMaxAreaRatio);
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314 | Environment::GetSingleton()->GetFloatValue("BvHierarchy.Construction.Initial.minArea", mInitialMinArea);
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315 |
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316 | //mMemoryConst = (float)(sizeof(VspLeaf) + sizeof(VspViewCell));
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317 | //mMemoryConst = (float)sizeof(BvhLeaf);
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318 | mMemoryConst = 16;//(float)sizeof(ObjectContainer);
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319 |
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320 | mUseBboxAreaForSah = true;
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321 |
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322 | /////////////
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323 | //-- debug output
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324 |
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325 | Debug << "******* Bvh hierarchy options ******** " << endl;
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326 | Debug << "max depth: " << mTermMaxDepth << endl;
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327 | Debug << "min probabiliy: " << mTermMinProbability<< endl;
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328 | Debug << "min objects: " << mTermMinObjects << endl;
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329 | Debug << "max cost ratio: " << mTermMaxCostRatio << endl;
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330 | Debug << "miss tolerance: " << mTermMissTolerance << endl;
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331 | Debug << "max leaves: " << mTermMaxLeaves << endl;
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332 | Debug << "randomize: " << randomize << endl;
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333 | Debug << "min global cost ratio: " << mTermMinGlobalCostRatio << endl;
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334 | Debug << "global cost miss tolerance: " << mTermGlobalCostMissTolerance << endl;
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335 | Debug << "only driving axis: " << mOnlyDrivingAxis << endl;
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336 | Debug << "max memory: " << mMaxMemory << endl;
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337 | Debug << "use cost heuristics: " << mUseCostHeuristics << endl;
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338 | Debug << "use surface area heuristics: " << mUseSah << endl;
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339 | Debug << "subdivision stats log: " << subdivisionStatsLog << endl;
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340 | //Debug << "split borders: " << mSplitBorder << endl;
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341 | Debug << "render cost decrease weight: " << mRenderCostDecreaseWeight << endl;
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342 | Debug << "use global sort: " << mUseGlobalSorting << endl;
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343 | Debug << "minimal rays for visibility: " << mMinRaysForVisibility << endl;
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344 | Debug << "bvh mem const: " << mMemoryConst << endl;
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345 | Debug << "apply initial partition: " << mApplyInitialPartition << endl;
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346 | Debug << "min objects: " << mInitialMinObjects << endl;
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347 | Debug << "max area ratio: " << mInitialMaxAreaRatio << endl;
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348 | Debug << "min area: " << mInitialMinArea << endl;
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349 |
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350 | Debug << endl;
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351 | }
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352 |
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353 |
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354 | void BvHierarchy::AssociateObjectsWithLeaf(BvhLeaf *leaf)
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355 | {
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356 | ObjectContainer::const_iterator oit, oit_end = leaf->mObjects.end();
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357 |
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358 | for (oit = leaf->mObjects.begin(); oit != oit_end; ++ oit)
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359 | {
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360 | (*oit)->mBvhLeaf = leaf;
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361 | }
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362 | }
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363 |
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364 |
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365 | static int CountRays(const ObjectContainer &objects)
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366 | {
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367 | int nRays = 0;
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368 |
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369 | ObjectContainer::const_iterator oit, oit_end = objects.end();
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370 |
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371 | // warning: not exact number (there can be rays counted twice)
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372 | // otherwise we would have to traverse trough all rays
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373 | for (oit = objects.begin(); oit != oit_end; ++ oit)
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374 | {
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375 | nRays += (int)(*oit)->GetOrCreateRays()->size();
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376 | }
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377 |
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378 | return nRays;
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379 | }
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380 |
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381 |
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382 | float BvHierarchy::GetViewSpaceVolume() const
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383 | {
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384 | return mViewCellsManager->GetViewSpaceBox().GetVolume();
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385 | }
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386 |
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387 |
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388 | void BvHierarchy::UpdateViewCells(const BvhSubdivisionCandidate &sc)
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389 | {
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390 | ViewCellContainer viewCells, frontViewCells, backViewCells;
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391 |
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392 | CollectViewCells(*sc.mParentData.mSampledObjects, viewCells, false, false);
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393 | CollectViewCells(sc.mSampledFrontObjects, frontViewCells, false, false);
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394 | CollectViewCells(sc.mSampledBackObjects, backViewCells, false, false);
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395 |
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396 | const float frontTri = (float)sc.mFrontObjects.size();
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397 | const float backTri = (float)sc.mBackObjects.size();
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398 | const float totalTri = (float)(*sc.mParentData.mSortedObjects[0]).size();
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399 |
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400 | ViewCell::NewMail(3);
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401 |
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402 | ViewCellContainer::const_iterator fit, fit_end = frontViewCells.end();
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403 |
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404 | for (fit = frontViewCells.begin(); fit != fit_end; ++ fit)
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405 | {
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406 | ViewCell *vc = *fit;
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407 | vc->Mail(0);
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408 | }
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409 |
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410 | ViewCellContainer::const_iterator bit, bit_end = backViewCells.end();
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411 |
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412 | for (bit = backViewCells.begin(); bit != bit_end; ++ bit)
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413 | {
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414 | ViewCell *vc = *bit;
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415 |
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416 | if (vc->Mailed(0))
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417 | vc->Mail(2);
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418 | else
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419 | vc->Mail(1);
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420 | }
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421 |
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422 | ViewCellContainer::const_iterator vit, vit_end = viewCells.end();
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423 |
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424 | for (vit = viewCells.begin(); vit != viewCells.end(); ++ vit)
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425 | {
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426 | ViewCell *vc = *vit;
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427 |
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428 | float vcTri;
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429 | int vcObj;
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430 |
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431 | float oldVcTri = vc->GetPvsCost();
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432 | int oldVcObj = vc->GetEntriesInPvs();
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433 |
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434 | // both objects in view cell
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435 | if (vc->Mailed(2))
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436 | {
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437 | vcTri = oldVcTri;
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438 | vcObj = oldVcObj + 1;
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439 | }
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440 | else if (vc->Mailed(1))
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441 | {
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442 | vcTri = oldVcTri - totalTri + backTri;
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443 | vcObj = oldVcObj;
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444 | }
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445 | else // (vc->Mailed(0))
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446 | {
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447 | vcTri = oldVcTri - totalTri + frontTri;
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448 | vcObj = oldVcObj;
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449 | }
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450 |
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451 | vc->SetPvsCost(vcTri);
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452 | vc->SetEntriesInPvs(vcObj);
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453 |
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454 | //cout << "old pvs tri: " << oldVcTri << " new: " << vcTri << endl;
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455 | //cout << "old pvs obj: " << oldVcObj << " new: " << vcObj<< endl;
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456 | }
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457 | }
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458 |
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459 |
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460 | BvhInterior *BvHierarchy::SubdivideNode(const BvhSubdivisionCandidate &sc,
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461 | BvhTraversalData &frontData,
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462 | BvhTraversalData &backData)
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463 | {
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464 | // fill view cells cache
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465 | mNodeTimer.Entry();
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466 |
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467 | const BvhTraversalData &tData = sc.mParentData;
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468 | BvhLeaf *leaf = tData.mNode;
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469 |
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470 | AxisAlignedBox3 parentBox = leaf->GetBoundingBox();
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471 |
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472 | // update stats: we have two new leaves
|
---|
473 | mBvhStats.nodes += 2;
|
---|
474 |
|
---|
475 | if (tData.mDepth > mBvhStats.maxDepth)
|
---|
476 | {
|
---|
477 | mBvhStats.maxDepth = tData.mDepth;
|
---|
478 | }
|
---|
479 |
|
---|
480 | // add the new nodes to the tree
|
---|
481 | BvhInterior *node = new BvhInterior(parentBox, leaf->GetParent());
|
---|
482 |
|
---|
483 |
|
---|
484 | //////////////////
|
---|
485 | //-- create front and back leaf
|
---|
486 |
|
---|
487 | AxisAlignedBox3 fbox = EvalBoundingBox(sc.mFrontObjects, &parentBox);
|
---|
488 | AxisAlignedBox3 bbox = EvalBoundingBox(sc.mBackObjects, &parentBox);
|
---|
489 |
|
---|
490 | BvhLeaf *back = new BvhLeaf(bbox, node, (int)sc.mBackObjects.size());
|
---|
491 | BvhLeaf *front = new BvhLeaf(fbox, node, (int)sc.mFrontObjects.size());
|
---|
492 |
|
---|
493 | BvhInterior *parent = leaf->GetParent();
|
---|
494 |
|
---|
495 | // replace a link from node's parent
|
---|
496 | if (parent)
|
---|
497 | {
|
---|
498 | parent->ReplaceChildLink(leaf, node);
|
---|
499 | node->SetParent(parent);
|
---|
500 | }
|
---|
501 | else // no parent => this node is the root
|
---|
502 | {
|
---|
503 | mRoot = node;
|
---|
504 | }
|
---|
505 |
|
---|
506 | // and setup child links
|
---|
507 | node->SetupChildLinks(front, back);
|
---|
508 |
|
---|
509 | ++ mBvhStats.splits;
|
---|
510 |
|
---|
511 |
|
---|
512 | ////////////////////////////////
|
---|
513 | //-- fill front and back traversal data with the new values
|
---|
514 |
|
---|
515 | frontData.mDepth = backData.mDepth = tData.mDepth + 1;
|
---|
516 |
|
---|
517 | frontData.mNode = front;
|
---|
518 | backData.mNode = back;
|
---|
519 |
|
---|
520 | backData.mSampledObjects = new ObjectContainer();
|
---|
521 | frontData.mSampledObjects = new ObjectContainer();
|
---|
522 |
|
---|
523 | *backData.mSampledObjects = sc.mSampledBackObjects;
|
---|
524 | *frontData.mSampledObjects = sc.mSampledFrontObjects;
|
---|
525 |
|
---|
526 | back->mObjects = sc.mBackObjects;
|
---|
527 | front->mObjects = sc.mFrontObjects;
|
---|
528 |
|
---|
529 | // if the number of rays is too low, no assumptions can be made
|
---|
530 | // (=> switch to surface area heuristics?)
|
---|
531 | frontData.mNumRays = CountRays(sc.mSampledFrontObjects);
|
---|
532 | backData.mNumRays = CountRays(sc.mSampledBackObjects);
|
---|
533 |
|
---|
534 | AssociateObjectsWithLeaf(back);
|
---|
535 | AssociateObjectsWithLeaf(front);
|
---|
536 |
|
---|
537 | ////////////
|
---|
538 | //-- compute pvs correction to cope with undersampling
|
---|
539 |
|
---|
540 | frontData.mPvs = (float)sc.mNumFrontViewCells;
|
---|
541 | backData.mPvs = (float)sc.mNumBackViewCells;
|
---|
542 |
|
---|
543 | frontData.mCorrectedPvs = sc.mCorrectedFrontPvs;
|
---|
544 | backData.mCorrectedPvs = sc.mCorrectedBackPvs;
|
---|
545 |
|
---|
546 |
|
---|
547 | // compute probability of this node being visible,
|
---|
548 | // i.e., volume of the view cells that can see this node
|
---|
549 | frontData.mVolume = sc.mVolumeFrontViewCells;
|
---|
550 | backData.mVolume = sc.mVolumeBackViewCells;
|
---|
551 |
|
---|
552 | frontData.mCorrectedVolume = sc.mCorrectedFrontVolume;
|
---|
553 | backData.mCorrectedVolume = sc.mCorrectedBackVolume;
|
---|
554 |
|
---|
555 |
|
---|
556 | // how often was max cost ratio missed in this branch?
|
---|
557 | frontData.mMaxCostMisses = sc.GetMaxCostMisses();
|
---|
558 | backData.mMaxCostMisses = sc.GetMaxCostMisses();
|
---|
559 |
|
---|
560 | // set the time stamp so the order of traversal can be reconstructed
|
---|
561 | node->SetTimeStamp(mHierarchyManager->mTimeStamp ++);
|
---|
562 |
|
---|
563 | // assign the objects in sorted order
|
---|
564 | if (mUseGlobalSorting)
|
---|
565 | {
|
---|
566 | AssignSortedObjects(sc, frontData, backData);
|
---|
567 | }
|
---|
568 |
|
---|
569 | // compute e.g., new render cost decrease after this split
|
---|
570 | UpdateViewCells(sc);
|
---|
571 |
|
---|
572 | mNodeTimer.Exit();
|
---|
573 |
|
---|
574 | // return the new interior node
|
---|
575 | return node;
|
---|
576 | }
|
---|
577 |
|
---|
578 |
|
---|
579 | BvhNode *BvHierarchy::Subdivide(SplitQueue &tQueue,
|
---|
580 | SubdivisionCandidate *splitCandidate,
|
---|
581 | const bool globalCriteriaMet
|
---|
582 | ,vector<SubdivisionCandidate *> &dirtyList
|
---|
583 | )
|
---|
584 | {
|
---|
585 | mSubdivTimer.Entry();
|
---|
586 |
|
---|
587 | BvhSubdivisionCandidate *sc =
|
---|
588 | static_cast<BvhSubdivisionCandidate *>(splitCandidate);
|
---|
589 | BvhTraversalData &tData = sc->mParentData;
|
---|
590 |
|
---|
591 | BvhNode *currentNode = tData.mNode;
|
---|
592 |
|
---|
593 | if (!LocalTerminationCriteriaMet(tData) && !globalCriteriaMet)
|
---|
594 | {
|
---|
595 | //////////////
|
---|
596 | //-- continue subdivision
|
---|
597 |
|
---|
598 | BvhTraversalData tFrontData;
|
---|
599 | BvhTraversalData tBackData;
|
---|
600 |
|
---|
601 | // create new interior node and two leaf node
|
---|
602 | currentNode = SubdivideNode(*sc, tFrontData, tBackData);
|
---|
603 |
|
---|
604 | // decrease the weighted average cost of the subdivisoin
|
---|
605 | mTotalCost -= sc->GetRenderCostDecrease();
|
---|
606 | mPvsEntries += sc->GetPvsEntriesIncr();
|
---|
607 |
|
---|
608 | // subdivision statistics
|
---|
609 | if (1) PrintSubdivisionStats(*sc);
|
---|
610 |
|
---|
611 |
|
---|
612 | ///////////////////////////
|
---|
613 | //-- push the new split candidates on the queue
|
---|
614 |
|
---|
615 | BvhSubdivisionCandidate *frontCandidate =
|
---|
616 | new BvhSubdivisionCandidate(tFrontData);
|
---|
617 | BvhSubdivisionCandidate *backCandidate =
|
---|
618 | new BvhSubdivisionCandidate(tBackData);
|
---|
619 |
|
---|
620 | // preprocess view cells
|
---|
621 | AssociateViewCellsWithObjects(*tData.mSampledObjects);
|
---|
622 |
|
---|
623 | EvalSubdivisionCandidate(*frontCandidate, true, false);
|
---|
624 | EvalSubdivisionCandidate(*backCandidate, true, false);
|
---|
625 |
|
---|
626 | CollectDirtyCandidates(sc, dirtyList, true);
|
---|
627 |
|
---|
628 | // release preprocessed view cells
|
---|
629 | ReleaseViewCells(*tData.mSampledObjects);
|
---|
630 |
|
---|
631 | // cross reference
|
---|
632 | tFrontData.mNode->SetSubdivisionCandidate(frontCandidate);
|
---|
633 | tBackData.mNode->SetSubdivisionCandidate(backCandidate);
|
---|
634 |
|
---|
635 | //cout << "f: " << frontCandidate->GetPriority() << " b: " << backCandidate->GetPriority() << endl;
|
---|
636 | tQueue.Push(frontCandidate);
|
---|
637 | tQueue.Push(backCandidate);
|
---|
638 | }
|
---|
639 |
|
---|
640 | /////////////////////////////////
|
---|
641 | //-- node is a leaf => terminate traversal
|
---|
642 |
|
---|
643 | if (currentNode->IsLeaf())
|
---|
644 | {
|
---|
645 | /////////////////////
|
---|
646 | //-- store additional info
|
---|
647 | EvaluateLeafStats(tData);
|
---|
648 |
|
---|
649 | // this leaf is no candidate for splitting anymore
|
---|
650 | // => detach subdivision candidate
|
---|
651 | tData.mNode->SetSubdivisionCandidate(NULL);
|
---|
652 | // detach node so we don't delete it with the traversal data
|
---|
653 | tData.mNode = NULL;
|
---|
654 | }
|
---|
655 |
|
---|
656 | mSubdivTimer.Exit();
|
---|
657 |
|
---|
658 | return currentNode;
|
---|
659 | }
|
---|
660 |
|
---|
661 |
|
---|
662 | float BvHierarchy::EvalPriority(const BvhSubdivisionCandidate &splitCandidate,
|
---|
663 | const float renderCostDecr,
|
---|
664 | const float oldRenderCost) const
|
---|
665 | {
|
---|
666 | float priority;
|
---|
667 |
|
---|
668 | if (mIsInitialSubdivision)
|
---|
669 | {
|
---|
670 | priority = (float)-splitCandidate.mParentData.mDepth;
|
---|
671 | return priority;
|
---|
672 | }
|
---|
673 |
|
---|
674 | BvhLeaf *leaf = splitCandidate.mParentData.mNode;
|
---|
675 |
|
---|
676 | // surface area heuristics is used when there is
|
---|
677 | // no view space subdivision available.
|
---|
678 | // In order to have some prioritized traversal,
|
---|
679 | // we use this formula instead
|
---|
680 | if (mHierarchyManager->GetViewSpaceSubdivisionType() ==
|
---|
681 | HierarchyManager::NO_VIEWSPACE_SUBDIV)
|
---|
682 | {
|
---|
683 | priority = EvalSahCost(leaf);
|
---|
684 | }
|
---|
685 | else
|
---|
686 | {
|
---|
687 | // take render cost of node into account
|
---|
688 | // otherwise danger of being stuck in a local minimum!
|
---|
689 | const float factor = mRenderCostDecreaseWeight;
|
---|
690 |
|
---|
691 | priority = factor * renderCostDecr + (1.0f - factor) * oldRenderCost;
|
---|
692 |
|
---|
693 | if (mHierarchyManager->mConsiderMemory)
|
---|
694 | {
|
---|
695 | priority /= ((float)splitCandidate.GetPvsEntriesIncr() + mMemoryConst);
|
---|
696 | }
|
---|
697 | }
|
---|
698 |
|
---|
699 | // hack: don't allow empty splits to be taken
|
---|
700 | if (splitCandidate.mFrontObjects.empty() || splitCandidate.mBackObjects.empty())
|
---|
701 | priority = 0;
|
---|
702 |
|
---|
703 | return priority;
|
---|
704 | }
|
---|
705 |
|
---|
706 |
|
---|
707 | static float AvgRayContribution(const int pvs, const int nRays)
|
---|
708 | {
|
---|
709 | return (float)pvs / ((float)nRays + Limits::Small);
|
---|
710 | }
|
---|
711 |
|
---|
712 |
|
---|
713 | static float AvgRaysPerObject(const int pvs, const int nRays)
|
---|
714 | {
|
---|
715 | return (float)nRays / ((float)pvs + Limits::Small);
|
---|
716 | }
|
---|
717 |
|
---|
718 |
|
---|
719 | void BvHierarchy::EvalSubdivisionCandidate(BvhSubdivisionCandidate &splitCandidate,
|
---|
720 | const bool computeSplitPlane,
|
---|
721 | const bool preprocessViewCells)
|
---|
722 | {
|
---|
723 | mPlaneTimer.Entry();
|
---|
724 |
|
---|
725 | const BvhTraversalData &tData = splitCandidate.mParentData;
|
---|
726 | BvhLeaf *leaf = tData.mNode;
|
---|
727 |
|
---|
728 | #if STORE_VIEWCELLS_WITH_BVH
|
---|
729 | if (preprocessViewCells) // fill view cells cache
|
---|
730 | AssociateViewCellsWithObjects(*splitCandidate.mParentData.mSampledObjects);
|
---|
731 | #endif
|
---|
732 |
|
---|
733 | if (computeSplitPlane)
|
---|
734 | {
|
---|
735 | splitCandidate.mFrontObjects.clear();
|
---|
736 | splitCandidate.mBackObjects.clear();
|
---|
737 |
|
---|
738 | splitCandidate.mSampledFrontObjects.clear();
|
---|
739 | splitCandidate.mSampledBackObjects.clear();
|
---|
740 |
|
---|
741 | const bool sufficientSamples =
|
---|
742 | tData.mNumRays > mMinRaysForVisibility;
|
---|
743 |
|
---|
744 | const bool useVisibiliyBasedHeuristics =
|
---|
745 | !mUseSah &&
|
---|
746 | (mHierarchyManager->GetViewSpaceSubdivisionType() ==
|
---|
747 | HierarchyManager::KD_BASED_VIEWSPACE_SUBDIV) &&
|
---|
748 | sufficientSamples;
|
---|
749 |
|
---|
750 | // compute best object partition
|
---|
751 | const float ratio = SelectObjectPartition(tData,
|
---|
752 | splitCandidate.mFrontObjects,
|
---|
753 | splitCandidate.mBackObjects,
|
---|
754 | useVisibiliyBasedHeuristics);
|
---|
755 |
|
---|
756 | // cost ratio violated?
|
---|
757 | const bool maxCostRatioViolated = mTermMaxCostRatio < ratio;
|
---|
758 | const int previousMisses = splitCandidate.mParentData.mMaxCostMisses;
|
---|
759 |
|
---|
760 | splitCandidate.SetMaxCostMisses(maxCostRatioViolated ?
|
---|
761 | previousMisses + 1 : previousMisses);
|
---|
762 |
|
---|
763 | StoreSampledObjects(splitCandidate.mSampledFrontObjects, splitCandidate.mFrontObjects);
|
---|
764 | StoreSampledObjects(splitCandidate.mSampledBackObjects, splitCandidate.mBackObjects);
|
---|
765 | }
|
---|
766 |
|
---|
767 | mPlaneTimer.Exit();
|
---|
768 |
|
---|
769 |
|
---|
770 | ///////////////////
|
---|
771 |
|
---|
772 | mEvalTimer.Entry();
|
---|
773 |
|
---|
774 | ViewCellContainer viewCells, frontViewCells, backViewCells;
|
---|
775 |
|
---|
776 | CollectViewCells(*tData.mSampledObjects, viewCells, false, false);
|
---|
777 | CollectViewCells(splitCandidate.mSampledFrontObjects, frontViewCells, false, false);
|
---|
778 | CollectViewCells(splitCandidate.mSampledBackObjects, backViewCells, false, false);
|
---|
779 |
|
---|
780 | // compute view cells seen from front and back side of the split
|
---|
781 | float volFront = 0, volBack = 0, parentVol = 0;
|
---|
782 |
|
---|
783 | ViewCell::NewMail(3);
|
---|
784 |
|
---|
785 | ViewCellContainer::const_iterator fvit, fvit_end = frontViewCells.end();
|
---|
786 |
|
---|
787 | for (fvit = frontViewCells.begin(); fvit != fvit_end; ++ fvit)
|
---|
788 | {
|
---|
789 | ViewCell *vc = *fvit;
|
---|
790 | vc->Mail(0);
|
---|
791 |
|
---|
792 | volFront += vc->GetVolume();
|
---|
793 | parentVol += vc->GetVolume();
|
---|
794 | }
|
---|
795 |
|
---|
796 | ViewCellContainer::const_iterator bvit, bvit_end = backViewCells.end();
|
---|
797 |
|
---|
798 | int frontAndBackViewCells = 0;
|
---|
799 |
|
---|
800 | for (bvit = backViewCells.begin(); bvit != bvit_end; ++ bvit)
|
---|
801 | {
|
---|
802 | ViewCell *vc = *bvit;
|
---|
803 |
|
---|
804 | if (vc->Mailed(0))
|
---|
805 | {
|
---|
806 | // view cell sees front AND on back side
|
---|
807 | ++ frontAndBackViewCells;
|
---|
808 | vc->Mail(2);
|
---|
809 | }
|
---|
810 | else
|
---|
811 | {
|
---|
812 | vc->Mail(1);
|
---|
813 | parentVol += vc->GetVolume();
|
---|
814 | }
|
---|
815 |
|
---|
816 | volBack += vc->GetVolume();
|
---|
817 | }
|
---|
818 |
|
---|
819 |
|
---|
820 | /////////////////////
|
---|
821 | //-- this bvh node is a pvs entry in all the view cells that see one of the objects.
|
---|
822 |
|
---|
823 | // pvs size induced by this bvh node is #view cells
|
---|
824 | const float pvs = (float)viewCells.size();
|
---|
825 | const float avgRaysPerObject = AvgRaysPerObject((int)pvs, tData.mNumRays);
|
---|
826 |
|
---|
827 | // for low #rays per object => the result is influenced by undersampling
|
---|
828 | splitCandidate.SetAvgRaysPerObject(avgRaysPerObject);
|
---|
829 | const float viewSpaceVol = GetViewSpaceVolume();
|
---|
830 |
|
---|
831 | splitCandidate.mVolumeFrontViewCells = volFront / viewSpaceVol;
|
---|
832 | splitCandidate.mVolumeBackViewCells = volBack / viewSpaceVol;
|
---|
833 |
|
---|
834 | splitCandidate.mNumFrontViewCells = (int)frontViewCells.size();
|
---|
835 | splitCandidate.mNumBackViewCells = (int)backViewCells.size();
|
---|
836 |
|
---|
837 | // currently not working!!
|
---|
838 | // todo matt: fix this to cope with undersampling for new evaluation method
|
---|
839 | splitCandidate.mCorrectedFrontVolume =
|
---|
840 | mHierarchyManager->EvalCorrectedPvs(splitCandidate.mVolumeFrontViewCells,
|
---|
841 | parentVol,
|
---|
842 | avgRaysPerObject);
|
---|
843 |
|
---|
844 | splitCandidate.mCorrectedBackVolume =
|
---|
845 | mHierarchyManager->EvalCorrectedPvs(splitCandidate.mVolumeBackViewCells,
|
---|
846 | parentVol,
|
---|
847 | avgRaysPerObject);
|
---|
848 |
|
---|
849 | ///////////////////////////////////
|
---|
850 |
|
---|
851 |
|
---|
852 | float newRenderCost = 0, oldRenderCost = 0;
|
---|
853 |
|
---|
854 | const float frontTri = (float)splitCandidate.mFrontObjects.size();
|
---|
855 | const float backTri = (float)splitCandidate.mBackObjects.size();
|
---|
856 | // total #triangles in parent
|
---|
857 | const float totalTri = (float)(*tData.mSortedObjects[0]).size();
|
---|
858 |
|
---|
859 |
|
---|
860 | // compute render cost decrease in the seen view cells
|
---|
861 | ViewCellContainer::const_iterator vit, vit_end = viewCells.end();
|
---|
862 |
|
---|
863 | for (vit = viewCells.begin(); vit != viewCells.end(); ++ vit)
|
---|
864 | {
|
---|
865 | ViewCell *vc = *vit;
|
---|
866 |
|
---|
867 | // triangles in this view cell
|
---|
868 | float vcTri;
|
---|
869 | // #entries in this view cell
|
---|
870 | int vcObj;
|
---|
871 |
|
---|
872 | float oldVcTri = vc->GetPvsCost();
|
---|
873 | int oldVcObj = vc->GetEntriesInPvs();
|
---|
874 |
|
---|
875 | // both nodes in this view cell
|
---|
876 | if (vc->Mailed(2))
|
---|
877 | {
|
---|
878 | vcTri = oldVcTri;
|
---|
879 | // #entries is increasing
|
---|
880 | vcObj = oldVcObj + 1;
|
---|
881 | }
|
---|
882 | else if (vc->Mailed(1))
|
---|
883 | {
|
---|
884 | // only front node in this view cell: #triangles is decreasing
|
---|
885 | vcTri = oldVcTri - totalTri + backTri;
|
---|
886 | vcObj = oldVcObj;
|
---|
887 | }
|
---|
888 | else // (vc->Mailed(0))
|
---|
889 | {
|
---|
890 | // // only back node in this view cell: #triangles is decreasing
|
---|
891 | vcTri = oldVcTri - totalTri + frontTri;
|
---|
892 | vcObj = oldVcObj;
|
---|
893 | }
|
---|
894 |
|
---|
895 | oldRenderCost += mViewCellsManager->ComputeRenderCost((int)oldVcTri, (int)oldVcObj) * vc->GetVolume() / viewSpaceVol;
|
---|
896 | newRenderCost += mViewCellsManager->ComputeRenderCost((int)vcTri, (int)vcObj) * vc->GetVolume() / viewSpaceVol;
|
---|
897 | //cout << "old rc=" << oldRenderCost << " new rc " << newRenderCost << endl;
|
---|
898 | }
|
---|
899 |
|
---|
900 | // compute global decrease in render cost
|
---|
901 | const float renderCostDecr = (oldRenderCost - newRenderCost);
|
---|
902 |
|
---|
903 | // for each view cell seen from front and back there is a new entry
|
---|
904 | const int pvsEntriesIncr = frontAndBackViewCells;
|
---|
905 |
|
---|
906 | splitCandidate.SetRenderCostDecrease(renderCostDecr);
|
---|
907 | splitCandidate.SetPvsEntriesIncr(pvsEntriesIncr);
|
---|
908 |
|
---|
909 | //cout << "bvh render cost decrease=" << renderCostDecr << endl;
|
---|
910 |
|
---|
911 | // at last computed priority based on render cost reduction / memory increase
|
---|
912 | const float priority = EvalPriority(splitCandidate, renderCostDecr, oldRenderCost);
|
---|
913 | splitCandidate.SetPriority(priority);
|
---|
914 |
|
---|
915 | #if STORE_VIEWCELLS_WITH_BVH
|
---|
916 | if (preprocessViewCells)
|
---|
917 | ReleaseViewCells(*splitCandidate.mParentData.mSampledObjects);
|
---|
918 | #endif
|
---|
919 |
|
---|
920 | mEvalTimer.Exit();
|
---|
921 | }
|
---|
922 |
|
---|
923 |
|
---|
924 | int BvHierarchy::EvalPvsEntriesIncr(BvhSubdivisionCandidate &splitCandidate,
|
---|
925 | const float avgRaysPerObjects,
|
---|
926 | const int numParentViewCells,
|
---|
927 | const int numFrontViewCells,
|
---|
928 | const int numBackViewCells) //const
|
---|
929 | {
|
---|
930 | const float oldPvsSize = (float)numParentViewCells;
|
---|
931 | const float oldPvsRatio =
|
---|
932 | (splitCandidate.mParentData.mPvs > 0) ? oldPvsSize / splitCandidate.mParentData.mPvs : 1;
|
---|
933 |
|
---|
934 | const float parentPvs = splitCandidate.mParentData.mCorrectedPvs * oldPvsRatio;
|
---|
935 |
|
---|
936 | const int frontViewCells = numFrontViewCells;
|
---|
937 | const int backViewCells = numBackViewCells;
|
---|
938 |
|
---|
939 | splitCandidate.mCorrectedFrontPvs =
|
---|
940 | mHierarchyManager->EvalCorrectedPvs((float)frontViewCells, parentPvs, avgRaysPerObjects);
|
---|
941 | splitCandidate.mCorrectedBackPvs =
|
---|
942 | mHierarchyManager->EvalCorrectedPvs((float)backViewCells, parentPvs, avgRaysPerObjects);
|
---|
943 |
|
---|
944 | if (0)
|
---|
945 | cout << "bvh pvs"
|
---|
946 | << " avg ray contri: " << avgRaysPerObjects << " ratio: " << oldPvsRatio
|
---|
947 | << " parent: " << parentPvs << " " << " old vol: " << oldPvsSize
|
---|
948 | << " frontpvs: " << frontViewCells << " corr. " << splitCandidate.mCorrectedFrontPvs
|
---|
949 | << " backpvs: " << frontViewCells << " corr. " << splitCandidate.mCorrectedBackPvs << endl;
|
---|
950 |
|
---|
951 | return (int)(splitCandidate.mCorrectedFrontPvs + splitCandidate.mCorrectedBackPvs - parentPvs);
|
---|
952 | }
|
---|
953 |
|
---|
954 |
|
---|
955 | inline bool BvHierarchy::LocalTerminationCriteriaMet(const BvhTraversalData &tData) const
|
---|
956 | {
|
---|
957 | const bool terminationCriteriaMet =
|
---|
958 | (0
|
---|
959 | || ((int)tData.mNode->mObjects.size() <= 1)//mTermMinObjects)
|
---|
960 | //|| (data.mProbability <= mTermMinProbability)
|
---|
961 | //|| (data.mNumRays <= mTermMinRays)
|
---|
962 | );
|
---|
963 |
|
---|
964 | #ifdef _DEBUG
|
---|
965 | if (terminationCriteriaMet)
|
---|
966 | {
|
---|
967 | cout << "bvh local termination criteria met:" << endl;
|
---|
968 | cout << "objects: " << (int)tData.mNode->mObjects.size() << " (" << mTermMinObjects << ")" << endl;
|
---|
969 | }
|
---|
970 | #endif
|
---|
971 | return terminationCriteriaMet;
|
---|
972 | }
|
---|
973 |
|
---|
974 |
|
---|
975 | inline bool BvHierarchy::GlobalTerminationCriteriaMet(const BvhTraversalData &data) const
|
---|
976 | {
|
---|
977 | // note: tracking for global cost termination
|
---|
978 | // does not make much sense for interleaved vsp / osp partition
|
---|
979 | // as it is the responsibility of the hierarchy manager
|
---|
980 |
|
---|
981 | const bool terminationCriteriaMet =
|
---|
982 | (0
|
---|
983 | || (mBvhStats.Leaves() >= mTermMaxLeaves)
|
---|
984 | //|| (mBvhStats.mGlobalCostMisses >= mTermGlobalCostMissTolerance)
|
---|
985 | //|| mOutOfMemory
|
---|
986 | );
|
---|
987 |
|
---|
988 | #ifdef GTP_DEBUG
|
---|
989 | if (terminationCriteriaMet)
|
---|
990 | {
|
---|
991 | Debug << "bvh global termination criteria met:" << endl;
|
---|
992 | Debug << "cost misses: " << mBvhStats.mGlobalCostMisses << " " << mTermGlobalCostMissTolerance << endl;
|
---|
993 | Debug << "leaves: " << mBvhStats.Leaves() << " " << mTermMaxLeaves << endl;
|
---|
994 | }
|
---|
995 | #endif
|
---|
996 | return terminationCriteriaMet;
|
---|
997 | }
|
---|
998 |
|
---|
999 |
|
---|
1000 | void BvHierarchy::EvaluateLeafStats(const BvhTraversalData &data)
|
---|
1001 | {
|
---|
1002 | // the node became a leaf -> evaluate stats for leafs
|
---|
1003 | BvhLeaf *leaf = data.mNode;
|
---|
1004 |
|
---|
1005 | ++ mCreatedLeaves;
|
---|
1006 |
|
---|
1007 |
|
---|
1008 | /*if (data.mProbability <= mTermMinProbability)
|
---|
1009 | {
|
---|
1010 | ++ mBvhStats.minProbabilityNodes;
|
---|
1011 | }*/
|
---|
1012 |
|
---|
1013 | ////////////////////////////////////////////
|
---|
1014 | // depth related stuff
|
---|
1015 |
|
---|
1016 | if (data.mDepth < mBvhStats.minDepth)
|
---|
1017 | {
|
---|
1018 | mBvhStats.minDepth = data.mDepth;
|
---|
1019 | }
|
---|
1020 |
|
---|
1021 | if (data.mDepth >= mTermMaxDepth)
|
---|
1022 | {
|
---|
1023 | ++ mBvhStats.maxDepthNodes;
|
---|
1024 | }
|
---|
1025 |
|
---|
1026 | // accumulate depth to compute average depth
|
---|
1027 | mBvhStats.accumDepth += data.mDepth;
|
---|
1028 |
|
---|
1029 |
|
---|
1030 | ////////////////////////////////////////////
|
---|
1031 | // objects related stuff
|
---|
1032 |
|
---|
1033 | // note: the sum should alwaysbe total number of objects for bvh
|
---|
1034 | mBvhStats.objectRefs += (int)leaf->mObjects.size();
|
---|
1035 |
|
---|
1036 | if ((int)leaf->mObjects.size() <= mTermMinObjects)
|
---|
1037 | {
|
---|
1038 | ++ mBvhStats.minObjectsNodes;
|
---|
1039 | }
|
---|
1040 |
|
---|
1041 | if (leaf->mObjects.empty())
|
---|
1042 | {
|
---|
1043 | ++ mBvhStats.emptyNodes;
|
---|
1044 | }
|
---|
1045 |
|
---|
1046 | if ((int)leaf->mObjects.size() > mBvhStats.maxObjectRefs)
|
---|
1047 | {
|
---|
1048 | mBvhStats.maxObjectRefs = (int)leaf->mObjects.size();
|
---|
1049 | }
|
---|
1050 |
|
---|
1051 | if ((int)leaf->mObjects.size() < mBvhStats.minObjectRefs)
|
---|
1052 | {
|
---|
1053 | mBvhStats.minObjectRefs = (int)leaf->mObjects.size();
|
---|
1054 | }
|
---|
1055 |
|
---|
1056 | ////////////////////////////////////////////
|
---|
1057 | // ray related stuff
|
---|
1058 |
|
---|
1059 | // note: this number should always accumulate to the total number of rays
|
---|
1060 | mBvhStats.rayRefs += data.mNumRays;
|
---|
1061 |
|
---|
1062 | if (data.mNumRays <= mTermMinRays)
|
---|
1063 | {
|
---|
1064 | ++ mBvhStats.minRaysNodes;
|
---|
1065 | }
|
---|
1066 |
|
---|
1067 | if (data.mNumRays > mBvhStats.maxRayRefs)
|
---|
1068 | {
|
---|
1069 | mBvhStats.maxRayRefs = data.mNumRays;
|
---|
1070 | }
|
---|
1071 |
|
---|
1072 | if (data.mNumRays < mBvhStats.minRayRefs)
|
---|
1073 | {
|
---|
1074 | mBvhStats.minRayRefs = data.mNumRays;
|
---|
1075 | }
|
---|
1076 |
|
---|
1077 | #ifdef _DEBUG
|
---|
1078 | cout << "depth: " << data.mDepth << " objects: " << (int)leaf->mObjects.size()
|
---|
1079 | << " rays: " << data.mNumRays << " rays / objects "
|
---|
1080 | << (float)data.mNumRays / (float)leaf->mObjects.size() << endl;
|
---|
1081 | #endif
|
---|
1082 | }
|
---|
1083 |
|
---|
1084 |
|
---|
1085 | #if 1
|
---|
1086 |
|
---|
1087 | /// compute object boundaries using spatial mid split
|
---|
1088 | float BvHierarchy::EvalLocalObjectPartition(const BvhTraversalData &tData,
|
---|
1089 | const int axis,
|
---|
1090 | ObjectContainer &objectsFront,
|
---|
1091 | ObjectContainer &objectsBack)
|
---|
1092 | {
|
---|
1093 | AxisAlignedBox3 parentBox = tData.mNode->GetBoundingBox();
|
---|
1094 |
|
---|
1095 | const float maxBox = parentBox.Max(axis);
|
---|
1096 | const float minBox = parentBox.Min(axis);
|
---|
1097 |
|
---|
1098 | float midPoint = (maxBox + minBox) * 0.5f;
|
---|
1099 |
|
---|
1100 | ObjectContainer::const_iterator oit, oit_end = tData.mNode->mObjects.end();
|
---|
1101 |
|
---|
1102 | for (oit = tData.mNode->mObjects.begin(); oit != oit_end; ++ oit)
|
---|
1103 | {
|
---|
1104 | Intersectable *obj = *oit;
|
---|
1105 | const AxisAlignedBox3 box = obj->GetBox();
|
---|
1106 |
|
---|
1107 | const float objMid = (box.Max(axis) + box.Min(axis)) * 0.5f;
|
---|
1108 |
|
---|
1109 | // object mailed => belongs to back objects
|
---|
1110 | if (objMid < midPoint)
|
---|
1111 | {
|
---|
1112 | objectsBack.push_back(obj);
|
---|
1113 | }
|
---|
1114 | else
|
---|
1115 | {
|
---|
1116 | objectsFront.push_back(obj);
|
---|
1117 | }
|
---|
1118 | }
|
---|
1119 |
|
---|
1120 | AxisAlignedBox3 fbox = EvalBoundingBox(objectsFront, &parentBox);
|
---|
1121 | AxisAlignedBox3 bbox = EvalBoundingBox(objectsBack, &parentBox);
|
---|
1122 |
|
---|
1123 | const float oldRenderCost = (float)tData.mNode->mObjects.size() * parentBox.SurfaceArea();
|
---|
1124 | const float newRenderCost = (float)objectsFront.size() * fbox.SurfaceArea() + (float)objectsBack.size() * bbox.SurfaceArea();
|
---|
1125 |
|
---|
1126 | const float ratio = newRenderCost / oldRenderCost;
|
---|
1127 | return ratio;
|
---|
1128 | }
|
---|
1129 |
|
---|
1130 | #else
|
---|
1131 |
|
---|
1132 | /// compute object partition by getting balanced objects on the left and right side
|
---|
1133 | float BvHierarchy::EvalLocalObjectPartition(const BvhTraversalData &tData,
|
---|
1134 | const int axis,
|
---|
1135 | ObjectContainer &objectsFront,
|
---|
1136 | ObjectContainer &objectsBack)
|
---|
1137 | {
|
---|
1138 | PrepareLocalSubdivisionCandidates(tData, axis);
|
---|
1139 |
|
---|
1140 | SortableEntryContainer::const_iterator cit, cit_end = mSubdivisionCandidates->end();
|
---|
1141 |
|
---|
1142 | int i = 0;
|
---|
1143 | const int border = (int)tData.mNode->mObjects.size() / 2;
|
---|
1144 |
|
---|
1145 | for (cit = mSubdivisionCandidates->begin(); cit != cit_end; ++ cit, ++ i)
|
---|
1146 | {
|
---|
1147 | Intersectable *obj = (*cit).mObject;
|
---|
1148 |
|
---|
1149 | // object mailed => belongs to back objects
|
---|
1150 | if (i < border)
|
---|
1151 | {
|
---|
1152 | objectsBack.push_back(obj);
|
---|
1153 | }
|
---|
1154 | else
|
---|
1155 | {
|
---|
1156 | objectsFront.push_back(obj);
|
---|
1157 | }
|
---|
1158 | }
|
---|
1159 |
|
---|
1160 | #if 1
|
---|
1161 | // hack: always take driving axis
|
---|
1162 | const float cost = (tData.mNode->GetBoundingBox().Size().DrivingAxis() == axis) ? -1.0f : 0.0f;
|
---|
1163 | #else
|
---|
1164 | const float oldRenderCost = EvalAbsCost(tData.mLeaf->mObjects) / EvalProbability(tData.mSampledObjects);
|
---|
1165 | const float newRenderCost = EvalRenderCost(objectsFront) + EvalRenderCost(objectsBack);
|
---|
1166 |
|
---|
1167 | const float cost = newRenderCost / oldRenderCost;
|
---|
1168 | #endif
|
---|
1169 |
|
---|
1170 | return cost;
|
---|
1171 | }
|
---|
1172 | #endif
|
---|
1173 |
|
---|
1174 |
|
---|
1175 | float BvHierarchy::EvalSah(const BvhTraversalData &tData,
|
---|
1176 | const int axis,
|
---|
1177 | ObjectContainer &objectsFront,
|
---|
1178 | ObjectContainer &objectsBack)
|
---|
1179 | {
|
---|
1180 | // go through the lists, count the number of objects left and right
|
---|
1181 | // and evaluate the following cost funcion:
|
---|
1182 | // C = ct_div_ci + (ol + or) / queries
|
---|
1183 | PrepareLocalSubdivisionCandidates(tData, axis);
|
---|
1184 |
|
---|
1185 | const float totalRenderCost = (float)tData.mNode->mObjects.size();
|
---|
1186 | float objectsLeft = 0, objectsRight = totalRenderCost;
|
---|
1187 |
|
---|
1188 | const AxisAlignedBox3 nodeBbox = tData.mNode->GetBoundingBox();
|
---|
1189 | const float boxArea = nodeBbox.SurfaceArea();
|
---|
1190 |
|
---|
1191 | float minSum = 1e20f;
|
---|
1192 |
|
---|
1193 | float minBorder = nodeBbox.Max(axis);
|
---|
1194 | float maxBorder = nodeBbox.Min(axis);
|
---|
1195 |
|
---|
1196 | float areaLeft = 0, areaRight = 0;
|
---|
1197 |
|
---|
1198 | SortableEntryContainer::const_iterator currentPos =
|
---|
1199 | mSubdivisionCandidates->begin();
|
---|
1200 |
|
---|
1201 | vector<float> bordersRight;
|
---|
1202 |
|
---|
1203 | // we keep track of both borders of the bounding boxes =>
|
---|
1204 | // store the events in descending order
|
---|
1205 |
|
---|
1206 | bordersRight.resize(mSubdivisionCandidates->size());
|
---|
1207 |
|
---|
1208 | SortableEntryContainer::reverse_iterator rcit =
|
---|
1209 | mSubdivisionCandidates->rbegin(), rcit_end = mSubdivisionCandidates->rend();
|
---|
1210 |
|
---|
1211 | vector<float>::reverse_iterator rbit = bordersRight.rbegin();
|
---|
1212 |
|
---|
1213 | for (; rcit != rcit_end; ++ rcit, ++ rbit)
|
---|
1214 | {
|
---|
1215 | Intersectable *obj = (*rcit).mObject;
|
---|
1216 | const AxisAlignedBox3 obox = obj->GetBox();
|
---|
1217 |
|
---|
1218 | if (obox.Min(axis) < minBorder)
|
---|
1219 | {
|
---|
1220 | minBorder = obox.Min(axis);
|
---|
1221 | }
|
---|
1222 |
|
---|
1223 | (*rbit) = minBorder;
|
---|
1224 | }
|
---|
1225 |
|
---|
1226 | // record surface areas during the sweep
|
---|
1227 | float al = 0;
|
---|
1228 | float ar = boxArea;
|
---|
1229 |
|
---|
1230 | vector<float>::const_iterator bit = bordersRight.begin();
|
---|
1231 | SortableEntryContainer::const_iterator cit, cit_end = mSubdivisionCandidates->end();
|
---|
1232 |
|
---|
1233 | for (cit = mSubdivisionCandidates->begin(); cit != cit_end; ++ cit, ++ bit)
|
---|
1234 | {
|
---|
1235 | Intersectable *obj = (*cit).mObject;
|
---|
1236 |
|
---|
1237 | ++ objectsLeft;
|
---|
1238 | -- objectsRight;
|
---|
1239 |
|
---|
1240 | const bool noValidSplit = ((objectsLeft <= Limits::Small) || (objectsRight <= Limits::Small));
|
---|
1241 | const AxisAlignedBox3 obox = obj->GetBox();
|
---|
1242 |
|
---|
1243 | // the borders of the bounding boxes have changed
|
---|
1244 | if (obox.Max(axis) > maxBorder)
|
---|
1245 | {
|
---|
1246 | maxBorder = obox.Max(axis);
|
---|
1247 | }
|
---|
1248 |
|
---|
1249 | minBorder = (*bit);
|
---|
1250 |
|
---|
1251 | AxisAlignedBox3 lbox = nodeBbox;
|
---|
1252 | AxisAlignedBox3 rbox = nodeBbox;
|
---|
1253 |
|
---|
1254 | lbox.SetMax(axis, maxBorder);
|
---|
1255 | rbox.SetMin(axis, minBorder);
|
---|
1256 |
|
---|
1257 | al = lbox.SurfaceArea();
|
---|
1258 | ar = rbox.SurfaceArea();
|
---|
1259 |
|
---|
1260 | // should use classical approach here ...
|
---|
1261 | #if BOUND_RENDERCOST
|
---|
1262 | const float rcLeft = std::max(objectsLeft, MIN_RENDERCOST);
|
---|
1263 | const float rcRight = std::max(objectsRight, MIN_RENDERCOST);
|
---|
1264 |
|
---|
1265 | const float sum = noValidSplit ? 1e25f : objectsLeft * al + objectsRight * ar;
|
---|
1266 | #else
|
---|
1267 |
|
---|
1268 | const float sum = noValidSplit ? 1e25f : objectsLeft * al + objectsRight * ar;
|
---|
1269 | #endif
|
---|
1270 |
|
---|
1271 | if (sum < minSum)
|
---|
1272 | {
|
---|
1273 | minSum = sum;
|
---|
1274 | areaLeft = al;
|
---|
1275 | areaRight = ar;
|
---|
1276 |
|
---|
1277 | // objects belong to left side now
|
---|
1278 | for (; currentPos != (cit + 1); ++ currentPos);
|
---|
1279 | }
|
---|
1280 | }
|
---|
1281 |
|
---|
1282 | ////////////
|
---|
1283 | //-- assign object to front and back volume
|
---|
1284 |
|
---|
1285 | // belongs to back bv
|
---|
1286 | for (cit = mSubdivisionCandidates->begin(); cit != currentPos; ++ cit)
|
---|
1287 | objectsBack.push_back((*cit).mObject);
|
---|
1288 |
|
---|
1289 | // belongs to front bv
|
---|
1290 | for (cit = currentPos; cit != cit_end; ++ cit)
|
---|
1291 | objectsFront.push_back((*cit).mObject);
|
---|
1292 |
|
---|
1293 | float newCost = minSum / boxArea;
|
---|
1294 | float ratio = newCost / totalRenderCost;
|
---|
1295 |
|
---|
1296 | #ifdef GTP_DEBUG
|
---|
1297 | cout << "\n\nobjects=(" << (int)objectsBack.size() << "," << (int)objectsFront.size() << " of "
|
---|
1298 | << (int)tData.mNode->mObjects.size() << ")\t area=("
|
---|
1299 | << areaLeft << ", " << areaRight << ", " << boxArea << ")" << endl
|
---|
1300 | << "cost= " << newCost << " oldCost=" << totalRenderCost / boxArea << endl;
|
---|
1301 | #endif
|
---|
1302 |
|
---|
1303 | return ratio;
|
---|
1304 | }
|
---|
1305 |
|
---|
1306 |
|
---|
1307 |
|
---|
1308 | float BvHierarchy::EvalSahWithTigherBbox(const BvhTraversalData &tData,
|
---|
1309 | const int axis,
|
---|
1310 | ObjectContainer &objectsFront,
|
---|
1311 | ObjectContainer &objectsBack)
|
---|
1312 | {
|
---|
1313 | // go through the lists, count the number of objects left and right
|
---|
1314 | // and evaluate the following cost funcion:
|
---|
1315 | // C = ct_div_ci + (ol + or) / queries
|
---|
1316 | PrepareLocalSubdivisionCandidates(tData, axis);
|
---|
1317 |
|
---|
1318 | const float totalRenderCost = (float)tData.mNode->mObjects.size();
|
---|
1319 | float objectsLeft = 0, objectsRight = totalRenderCost;
|
---|
1320 |
|
---|
1321 | const AxisAlignedBox3 nodeBbox = tData.mNode->GetBoundingBox();
|
---|
1322 |
|
---|
1323 | const float minBox = nodeBbox.Min(axis);
|
---|
1324 | const float maxBox = nodeBbox.Max(axis);
|
---|
1325 | const float boxArea = nodeBbox.SurfaceArea();
|
---|
1326 |
|
---|
1327 | float minSum = 1e20f;
|
---|
1328 |
|
---|
1329 | Vector3 minBorder = nodeBbox.Max();
|
---|
1330 | Vector3 maxBorder = nodeBbox.Min();
|
---|
1331 |
|
---|
1332 | float areaLeft = 0, areaRight = 0;
|
---|
1333 |
|
---|
1334 | SortableEntryContainer::const_iterator currentPos =
|
---|
1335 | mSubdivisionCandidates->begin();
|
---|
1336 |
|
---|
1337 | vector<Vector3> bordersRight;
|
---|
1338 |
|
---|
1339 | // we keep track of both borders of the bounding boxes =>
|
---|
1340 | // store the events in descending order
|
---|
1341 | bordersRight.resize(mSubdivisionCandidates->size());
|
---|
1342 |
|
---|
1343 | SortableEntryContainer::reverse_iterator rcit =
|
---|
1344 | mSubdivisionCandidates->rbegin(), rcit_end =
|
---|
1345 | mSubdivisionCandidates->rend();
|
---|
1346 |
|
---|
1347 | vector<Vector3>::reverse_iterator rbit = bordersRight.rbegin();
|
---|
1348 |
|
---|
1349 | for (; rcit != rcit_end; ++ rcit, ++ rbit)
|
---|
1350 | {
|
---|
1351 | Intersectable *obj = (*rcit).mObject;
|
---|
1352 | const AxisAlignedBox3 obox = obj->GetBox();
|
---|
1353 |
|
---|
1354 | for (int i = 0; i < 3; ++ i)
|
---|
1355 | {
|
---|
1356 | if (obox.Min(i) < minBorder[i])
|
---|
1357 | {
|
---|
1358 | minBorder[i] = obox.Min(i);
|
---|
1359 | }
|
---|
1360 | }
|
---|
1361 |
|
---|
1362 | (*rbit) = minBorder;
|
---|
1363 | }
|
---|
1364 |
|
---|
1365 | // temporary surface areas
|
---|
1366 | float al = 0;
|
---|
1367 | float ar = boxArea;
|
---|
1368 |
|
---|
1369 | vector<Vector3>::const_iterator bit = bordersRight.begin();
|
---|
1370 | SortableEntryContainer::const_iterator cit, cit_end =
|
---|
1371 | mSubdivisionCandidates->end();
|
---|
1372 |
|
---|
1373 | for (cit = mSubdivisionCandidates->begin(); cit != cit_end; ++ cit, ++ bit)
|
---|
1374 | {
|
---|
1375 | Intersectable *obj = (*cit).mObject;
|
---|
1376 |
|
---|
1377 | objectsLeft ++;;
|
---|
1378 | objectsRight --;
|
---|
1379 |
|
---|
1380 | const AxisAlignedBox3 obox = obj->GetBox();
|
---|
1381 |
|
---|
1382 | AxisAlignedBox3 lbox = nodeBbox;
|
---|
1383 | AxisAlignedBox3 rbox = nodeBbox;
|
---|
1384 |
|
---|
1385 | // the borders of the left bounding box have changed
|
---|
1386 | for (int i = 0; i < 3; ++ i)
|
---|
1387 | {
|
---|
1388 | if (obox.Max(i) > maxBorder[i])
|
---|
1389 | {
|
---|
1390 | maxBorder[i] = obox.Max(i);
|
---|
1391 | }
|
---|
1392 | }
|
---|
1393 |
|
---|
1394 | minBorder = (*bit);
|
---|
1395 |
|
---|
1396 | lbox.SetMax(maxBorder);
|
---|
1397 | rbox.SetMin(minBorder);
|
---|
1398 |
|
---|
1399 | al = lbox.SurfaceArea();
|
---|
1400 | ar = rbox.SurfaceArea();
|
---|
1401 |
|
---|
1402 | const bool noValidSplit = ((objectsLeft <= Limits::Small) || (objectsRight <= Limits::Small));
|
---|
1403 | const float sum = noValidSplit ? 1e25f : objectsLeft * al + objectsRight * ar;
|
---|
1404 |
|
---|
1405 | if (sum < minSum)
|
---|
1406 | {
|
---|
1407 | minSum = sum;
|
---|
1408 | areaLeft = al;
|
---|
1409 | areaRight = ar;
|
---|
1410 |
|
---|
1411 | // objects belong to left side now
|
---|
1412 | for (; currentPos != (cit + 1); ++ currentPos);
|
---|
1413 | }
|
---|
1414 | }
|
---|
1415 |
|
---|
1416 | /////////////
|
---|
1417 | //-- assign object to front and back volume
|
---|
1418 |
|
---|
1419 | // belongs to back bv
|
---|
1420 | for (cit = mSubdivisionCandidates->begin(); cit != currentPos; ++ cit)
|
---|
1421 | objectsBack.push_back((*cit).mObject);
|
---|
1422 |
|
---|
1423 | // belongs to front bv
|
---|
1424 | for (cit = currentPos; cit != cit_end; ++ cit)
|
---|
1425 | objectsFront.push_back((*cit).mObject);
|
---|
1426 |
|
---|
1427 | float newCost = minSum / boxArea;
|
---|
1428 | float ratio = newCost / totalRenderCost;
|
---|
1429 |
|
---|
1430 | #ifdef GTP_DEBUG
|
---|
1431 | cout << "\n\nobjects=(" << (int)objectsBack.size() << "," << (int)objectsFront.size() << " of "
|
---|
1432 | << (int)tData.mNode->mObjects.size() << ")\t area=("
|
---|
1433 | << areaLeft << ", " << areaRight << ", " << boxArea << ")" << endl
|
---|
1434 | << "cost= " << newCost << " oldCost=" << totalRenderCost / boxArea << endl;
|
---|
1435 | #endif
|
---|
1436 |
|
---|
1437 | return ratio;
|
---|
1438 | }
|
---|
1439 |
|
---|
1440 |
|
---|
1441 | static bool PrepareOutput(const int axis,
|
---|
1442 | const int leaves,
|
---|
1443 | ofstream &sumStats,
|
---|
1444 | ofstream &vollStats,
|
---|
1445 | ofstream &volrStats)
|
---|
1446 | {
|
---|
1447 | if ((axis == 0) && (leaves > 0) && (leaves < 90))
|
---|
1448 | {
|
---|
1449 | char str[64];
|
---|
1450 | sprintf(str, "tmp/bvh_heur_sum-%04d.log", leaves);
|
---|
1451 | sumStats.open(str);
|
---|
1452 | sprintf(str, "tmp/bvh_heur_voll-%04d.log", leaves);
|
---|
1453 | vollStats.open(str);
|
---|
1454 | sprintf(str, "tmp/bvh_heur_volr-%04d.log", leaves);
|
---|
1455 | volrStats.open(str);
|
---|
1456 | }
|
---|
1457 |
|
---|
1458 | return sumStats.is_open() && vollStats.is_open() && volrStats.is_open();
|
---|
1459 | }
|
---|
1460 |
|
---|
1461 |
|
---|
1462 | static void PrintHeuristics(const float objectsRight,
|
---|
1463 | const float sum,
|
---|
1464 | const float volLeft,
|
---|
1465 | const float volRight,
|
---|
1466 | const float viewSpaceVol,
|
---|
1467 | ofstream &sumStats,
|
---|
1468 | ofstream &vollStats,
|
---|
1469 | ofstream &volrStats)
|
---|
1470 | {
|
---|
1471 | sumStats
|
---|
1472 | << "#Position\n" << objectsRight << endl
|
---|
1473 | << "#Sum\n" << sum / viewSpaceVol << endl
|
---|
1474 | << "#Vol\n" << (volLeft + volRight) / viewSpaceVol << endl;
|
---|
1475 |
|
---|
1476 | vollStats
|
---|
1477 | << "#Position\n" << objectsRight << endl
|
---|
1478 | << "#Vol\n" << volLeft / viewSpaceVol << endl;
|
---|
1479 |
|
---|
1480 | volrStats
|
---|
1481 | << "#Position\n" << objectsRight << endl
|
---|
1482 | << "#Vol\n" << volRight / viewSpaceVol << endl;
|
---|
1483 | }
|
---|
1484 |
|
---|
1485 |
|
---|
1486 | float BvHierarchy::EvalLocalCostHeuristics(const BvhTraversalData &tData,
|
---|
1487 | const int axis,
|
---|
1488 | ObjectContainer &objectsFront,
|
---|
1489 | ObjectContainer &objectsBack)
|
---|
1490 | {
|
---|
1491 | /////////////////////////////////////////////
|
---|
1492 | //-- go through the lists, count the number of objects
|
---|
1493 | //-- left and right and evaluate the cost funcion
|
---|
1494 |
|
---|
1495 | // prepare the heuristics, set mailboxes and counters
|
---|
1496 | const float totalVol = PrepareHeuristics(tData, axis);
|
---|
1497 |
|
---|
1498 | // local helper variables
|
---|
1499 | float volLeft = 0;
|
---|
1500 | float volRight = totalVol;
|
---|
1501 |
|
---|
1502 | const float nTotalObjects = (float)tData.mNode->mObjects.size();
|
---|
1503 | float nObjectsLeft = 0;
|
---|
1504 | float nObjectsRight = nTotalObjects;
|
---|
1505 |
|
---|
1506 | const float viewSpaceVol =
|
---|
1507 | mViewCellsManager->GetViewSpaceBox().GetVolume();
|
---|
1508 |
|
---|
1509 | SortableEntryContainer::const_iterator backObjectsStart =
|
---|
1510 | mSubdivisionCandidates->begin();
|
---|
1511 |
|
---|
1512 | /////////////////////////////////
|
---|
1513 | //-- the parameters for the current optimum
|
---|
1514 |
|
---|
1515 | float volBack = volLeft;
|
---|
1516 | float volFront = volRight;
|
---|
1517 | float newRenderCost = nTotalObjects * totalVol;
|
---|
1518 |
|
---|
1519 | #ifdef GTP_DEBUG
|
---|
1520 | ofstream sumStats;
|
---|
1521 | ofstream vollStats;
|
---|
1522 | ofstream volrStats;
|
---|
1523 |
|
---|
1524 | const bool printStats = PrepareOutput(axis,
|
---|
1525 | mBvhStats.Leaves(),
|
---|
1526 | sumStats,
|
---|
1527 | vollStats,
|
---|
1528 | volrStats);
|
---|
1529 | #endif
|
---|
1530 |
|
---|
1531 | ///////////////////////
|
---|
1532 | //-- the sweep heuristics
|
---|
1533 | //-- traverse through events and find best split plane
|
---|
1534 |
|
---|
1535 | SortableEntryContainer::const_iterator cit,
|
---|
1536 | cit_end = cit_end = mSubdivisionCandidates->end();
|
---|
1537 |
|
---|
1538 | for (cit = mSubdivisionCandidates->begin(); cit != cit_end; ++ cit)
|
---|
1539 | {
|
---|
1540 | Intersectable *object = (*cit).mObject;
|
---|
1541 |
|
---|
1542 | // evaluate change in l and r volume
|
---|
1543 | // voll = view cells that see only left node (i.e., left pvs)
|
---|
1544 | // volr = view cells that see only right node (i.e., right pvs)
|
---|
1545 | EvalHeuristicsContribution(object, volLeft, volRight);
|
---|
1546 |
|
---|
1547 | ++ nObjectsLeft;
|
---|
1548 | -- nObjectsRight;
|
---|
1549 |
|
---|
1550 | // split is only valid if #objects on left and right is not zero
|
---|
1551 | const bool noValidSplit = (nObjectsRight <= Limits::Small);
|
---|
1552 |
|
---|
1553 | // the heuristics
|
---|
1554 | const float sum = noValidSplit ?
|
---|
1555 | 1e25f : volLeft * (float)nObjectsLeft + volRight * (float)nObjectsRight;
|
---|
1556 |
|
---|
1557 |
|
---|
1558 | #ifdef GTP_DEBUG
|
---|
1559 | if (printStats)
|
---|
1560 | {
|
---|
1561 | PrintHeuristics(nObjectsRight, sum, volLeft,
|
---|
1562 | volRight, viewSpaceVol,
|
---|
1563 | sumStats, vollStats, volrStats);
|
---|
1564 | }
|
---|
1565 | #endif
|
---|
1566 |
|
---|
1567 | if (sum < newRenderCost)
|
---|
1568 | {
|
---|
1569 | newRenderCost = sum;
|
---|
1570 |
|
---|
1571 | volBack = volLeft;
|
---|
1572 | volFront = volRight;
|
---|
1573 |
|
---|
1574 | // objects belongs to left side now
|
---|
1575 | for (; backObjectsStart != (cit + 1); ++ backObjectsStart);
|
---|
1576 | }
|
---|
1577 | }
|
---|
1578 |
|
---|
1579 | ////////////////////////////////////////
|
---|
1580 | //-- assign object to front and back volume
|
---|
1581 |
|
---|
1582 | // belongs to back bv
|
---|
1583 | for (cit = mSubdivisionCandidates->begin(); cit != backObjectsStart; ++ cit)
|
---|
1584 | {
|
---|
1585 | objectsBack.push_back((*cit).mObject);
|
---|
1586 | }
|
---|
1587 | // belongs to front bv
|
---|
1588 | for (cit = backObjectsStart; cit != cit_end; ++ cit)
|
---|
1589 | {
|
---|
1590 | objectsFront.push_back((*cit).mObject);
|
---|
1591 | }
|
---|
1592 |
|
---|
1593 | // render cost of the old parent
|
---|
1594 | const float oldRenderCost = (float)nTotalObjects * totalVol + Limits::Small;
|
---|
1595 | // the relative cost ratio
|
---|
1596 | const float ratio = newRenderCost / oldRenderCost;
|
---|
1597 |
|
---|
1598 | #ifdef GTP_DEBUG
|
---|
1599 | Debug << "\n§§§§ bvh eval const decrease §§§§" << endl
|
---|
1600 | << "back pvs: " << (int)objectsBack.size() << " front pvs: "
|
---|
1601 | << (int)objectsFront.size() << " total pvs: " << nTotalObjects << endl
|
---|
1602 | << "back p: " << volBack / viewSpaceVol << " front p "
|
---|
1603 | << volFront / viewSpaceVol << " p: " << totalVol / viewSpaceVol << endl
|
---|
1604 | << "old rc: " << oldRenderCost / viewSpaceVol << " new rc: "
|
---|
1605 | << newRenderCost / viewSpaceVol << endl
|
---|
1606 | << "render cost decrease: "
|
---|
1607 | << oldRenderCost / viewSpaceVol - newRenderCost / viewSpaceVol << endl;
|
---|
1608 | #endif
|
---|
1609 |
|
---|
1610 | return ratio;
|
---|
1611 | }
|
---|
1612 |
|
---|
1613 |
|
---|
1614 | void BvHierarchy::PrepareLocalSubdivisionCandidates(const BvhTraversalData &tData,
|
---|
1615 | const int axis)
|
---|
1616 | {
|
---|
1617 | mSortTimer.Entry();
|
---|
1618 |
|
---|
1619 | //-- insert object queries
|
---|
1620 | ObjectContainer *objects = mUseGlobalSorting ?
|
---|
1621 | tData.mSortedObjects[axis] : &tData.mNode->mObjects;
|
---|
1622 |
|
---|
1623 | CreateLocalSubdivisionCandidates(*objects, &mSubdivisionCandidates, !mUseGlobalSorting, axis);
|
---|
1624 |
|
---|
1625 | mSortTimer.Exit();
|
---|
1626 | }
|
---|
1627 |
|
---|
1628 |
|
---|
1629 | void BvHierarchy::CreateLocalSubdivisionCandidates(const ObjectContainer &objects,
|
---|
1630 | SortableEntryContainer **subdivisionCandidates,
|
---|
1631 | const bool sortEntries,
|
---|
1632 | const int axis)
|
---|
1633 | {
|
---|
1634 | (*subdivisionCandidates)->clear();
|
---|
1635 |
|
---|
1636 | // compute requested size and look if subdivision candidate has to be recomputed
|
---|
1637 | const int requestedSize = (int)objects.size();
|
---|
1638 |
|
---|
1639 | // creates a sorted split candidates array
|
---|
1640 | if ((*subdivisionCandidates)->capacity() > 500000 &&
|
---|
1641 | requestedSize < (int)((*subdivisionCandidates)->capacity() / 10) )
|
---|
1642 | {
|
---|
1643 | delete (*subdivisionCandidates);
|
---|
1644 | (*subdivisionCandidates) = new SortableEntryContainer;
|
---|
1645 | }
|
---|
1646 |
|
---|
1647 | (*subdivisionCandidates)->reserve(requestedSize);
|
---|
1648 |
|
---|
1649 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
1650 |
|
---|
1651 | for (oit = objects.begin(); oit < oit_end; ++ oit)
|
---|
1652 | {
|
---|
1653 | (*subdivisionCandidates)->push_back(SortableEntry(*oit, (*oit)->GetBox().Center(axis)));
|
---|
1654 | }
|
---|
1655 |
|
---|
1656 | if (sortEntries)
|
---|
1657 | { // no presorted candidate list
|
---|
1658 | stable_sort((*subdivisionCandidates)->begin(), (*subdivisionCandidates)->end());
|
---|
1659 | //sort((*subdivisionCandidates)->begin(), (*subdivisionCandidates)->end());
|
---|
1660 | }
|
---|
1661 | }
|
---|
1662 |
|
---|
1663 |
|
---|
1664 | const BvhStatistics &BvHierarchy::GetStatistics() const
|
---|
1665 | {
|
---|
1666 | return mBvhStats;
|
---|
1667 | }
|
---|
1668 |
|
---|
1669 |
|
---|
1670 | float BvHierarchy::PrepareHeuristics(const BvhTraversalData &tData,
|
---|
1671 | const int axis)
|
---|
1672 | {
|
---|
1673 | BvhLeaf *leaf = tData.mNode;
|
---|
1674 | float vol = 0;
|
---|
1675 |
|
---|
1676 | // sort so we can use a sweep from right to left
|
---|
1677 | PrepareLocalSubdivisionCandidates(tData, axis);
|
---|
1678 |
|
---|
1679 | // collect and mark the view cells as belonging to front pvs
|
---|
1680 | ViewCellContainer viewCells;
|
---|
1681 |
|
---|
1682 | const bool setCounter = true;
|
---|
1683 | const bool onlyUnmailed = true;
|
---|
1684 |
|
---|
1685 |
|
---|
1686 | CollectViewCells(*tData.mSampledObjects,
|
---|
1687 | viewCells,
|
---|
1688 | setCounter,
|
---|
1689 | onlyUnmailed);
|
---|
1690 |
|
---|
1691 | ViewCellContainer::const_iterator vit, vit_end = viewCells.end();
|
---|
1692 |
|
---|
1693 | for (vit = viewCells.begin(); vit != vit_end; ++ vit)
|
---|
1694 | {
|
---|
1695 | #if USE_VOLUMES_FOR_HEURISTICS
|
---|
1696 | const float volIncr = (*vit)->GetVolume();
|
---|
1697 | #else
|
---|
1698 | const float volIncr = 1.0f;
|
---|
1699 | #endif
|
---|
1700 | vol += volIncr;
|
---|
1701 | }
|
---|
1702 |
|
---|
1703 | // mail view cells that go from front node to back node
|
---|
1704 | ViewCell::NewMail();
|
---|
1705 |
|
---|
1706 | return vol;
|
---|
1707 | }
|
---|
1708 |
|
---|
1709 | ///////////////////////////////////////////////////////////
|
---|
1710 |
|
---|
1711 |
|
---|
1712 | void BvHierarchy::EvalHeuristicsContribution(Intersectable *obj,
|
---|
1713 | float &volLeft,
|
---|
1714 | float &volRight)
|
---|
1715 | {
|
---|
1716 | // collect all view cells associated with this objects
|
---|
1717 | // (also multiple times, if they are pierced by several rays)
|
---|
1718 | ViewCellContainer viewCells;
|
---|
1719 |
|
---|
1720 | const bool useMailboxing = false;
|
---|
1721 | const bool setCounter = false;
|
---|
1722 | const bool onlyUnmailedRays = true;
|
---|
1723 |
|
---|
1724 | CollectViewCells(obj, viewCells, useMailboxing, setCounter, onlyUnmailedRays);
|
---|
1725 |
|
---|
1726 | // classify view cells and compute volume contri accordingly
|
---|
1727 | // possible view cell classifications:
|
---|
1728 | // view cell mailed => view cell can be seen from left child node
|
---|
1729 | // view cell counter > 0 view cell can be seen from right child node
|
---|
1730 | // combined: view cell volume belongs to both nodes
|
---|
1731 | ViewCellContainer::const_iterator vit, vit_end = viewCells.end();
|
---|
1732 |
|
---|
1733 | for (vit = viewCells.begin(); vit != vit_end; ++ vit)
|
---|
1734 | {
|
---|
1735 | // view cells can also be seen from left child node
|
---|
1736 | ViewCell *viewCell = *vit;
|
---|
1737 |
|
---|
1738 | #if USE_VOLUMES_FOR_HEURISTICS
|
---|
1739 | const float vol = viewCell->GetVolume();
|
---|
1740 | #else
|
---|
1741 | const float vol = 1.0f;
|
---|
1742 | #endif
|
---|
1743 | if (!viewCell->Mailed())
|
---|
1744 | {
|
---|
1745 | viewCell->Mail();
|
---|
1746 | // we now see view cell from both nodes
|
---|
1747 | // => add volume to left node
|
---|
1748 | volLeft += vol;
|
---|
1749 | }
|
---|
1750 |
|
---|
1751 | // last reference into the right node
|
---|
1752 | if (-- viewCell->mCounter == 0)
|
---|
1753 | {
|
---|
1754 | // view cell was previously seen from both nodes =>
|
---|
1755 | // remove volume from right node
|
---|
1756 | volRight -= vol;
|
---|
1757 | }
|
---|
1758 | }
|
---|
1759 | }
|
---|
1760 |
|
---|
1761 |
|
---|
1762 | void BvHierarchy::SetViewCellsManager(ViewCellsManager *vcm)
|
---|
1763 | {
|
---|
1764 | mViewCellsManager = vcm;
|
---|
1765 | }
|
---|
1766 |
|
---|
1767 |
|
---|
1768 | AxisAlignedBox3 BvHierarchy::GetBoundingBox() const
|
---|
1769 | {
|
---|
1770 | return mBoundingBox;
|
---|
1771 | }
|
---|
1772 |
|
---|
1773 |
|
---|
1774 | float BvHierarchy::SelectObjectPartition(const BvhTraversalData &tData,
|
---|
1775 | ObjectContainer &frontObjects,
|
---|
1776 | ObjectContainer &backObjects,
|
---|
1777 | bool useVisibilityBasedHeuristics)
|
---|
1778 | {
|
---|
1779 | mSplitTimer.Entry();
|
---|
1780 |
|
---|
1781 | if (mIsInitialSubdivision)
|
---|
1782 | {
|
---|
1783 | ApplyInitialSplit(tData, frontObjects, backObjects);
|
---|
1784 | return 0;
|
---|
1785 | }
|
---|
1786 |
|
---|
1787 | ObjectContainer nFrontObjects[3];
|
---|
1788 | ObjectContainer nBackObjects[3];
|
---|
1789 | float nCostRatio[3];
|
---|
1790 |
|
---|
1791 | int sAxis = 0;
|
---|
1792 | int bestAxis = -1;
|
---|
1793 |
|
---|
1794 | if (mOnlyDrivingAxis)
|
---|
1795 | {
|
---|
1796 | const AxisAlignedBox3 box = tData.mNode->GetBoundingBox();
|
---|
1797 | sAxis = box.Size().DrivingAxis();
|
---|
1798 | }
|
---|
1799 |
|
---|
1800 | // if #rays high consider only use a subset of the rays for
|
---|
1801 | // visibility based heuristics
|
---|
1802 | VssRay::NewMail();
|
---|
1803 |
|
---|
1804 | /*if ((mMaxTests < tData.mNumRays) && mUseCostHeuristics && useVisibilityBasedHeuristics)
|
---|
1805 | {
|
---|
1806 | VssRayContainer rays;
|
---|
1807 |
|
---|
1808 | // maximal 2 objects share the same ray
|
---|
1809 | rays.reserve(tData.mNumRays * 2);
|
---|
1810 | CollectRays(tData.mNode->mObjects, rays);
|
---|
1811 |
|
---|
1812 | const float prop = (float)mMaxTests / (float)rays.size();
|
---|
1813 |
|
---|
1814 | VssRayContainer::const_iterator rit, rit_end = rays.end();
|
---|
1815 |
|
---|
1816 | // mail rays which will not be considered
|
---|
1817 | for (rit = rays.begin(); rit != rit_end; ++ rit)
|
---|
1818 | {
|
---|
1819 | if (Random(1.0f) > prop)
|
---|
1820 | {
|
---|
1821 | (*rit)->Mail();
|
---|
1822 | }
|
---|
1823 | }
|
---|
1824 | }*/
|
---|
1825 |
|
---|
1826 | ////////////////////////////////////
|
---|
1827 | //-- evaluate split cost for all three axis
|
---|
1828 |
|
---|
1829 | for (int axis = 0; axis < 3; ++ axis)
|
---|
1830 | {
|
---|
1831 | if (!mOnlyDrivingAxis || (axis == sAxis))
|
---|
1832 | {
|
---|
1833 | if (mUseCostHeuristics)
|
---|
1834 | {
|
---|
1835 | //////////////////////////////////
|
---|
1836 | //-- split objects using heuristics
|
---|
1837 |
|
---|
1838 | if (useVisibilityBasedHeuristics)
|
---|
1839 | {
|
---|
1840 | ///////////
|
---|
1841 | //-- heuristics using objects weighted by view cells volume
|
---|
1842 | nCostRatio[axis] =
|
---|
1843 | EvalLocalCostHeuristics(tData,
|
---|
1844 | axis,
|
---|
1845 | nFrontObjects[axis],
|
---|
1846 | nBackObjects[axis]);
|
---|
1847 | }
|
---|
1848 | else
|
---|
1849 | {
|
---|
1850 | //////////////////
|
---|
1851 | //-- view cells not constructed yet => use surface area heuristic
|
---|
1852 | nCostRatio[axis] = EvalSah(tData,
|
---|
1853 | axis,
|
---|
1854 | nFrontObjects[axis],
|
---|
1855 | nBackObjects[axis]);
|
---|
1856 | }
|
---|
1857 | }
|
---|
1858 | else
|
---|
1859 | {
|
---|
1860 | //-- split objects using some simple criteria
|
---|
1861 | nCostRatio[axis] =
|
---|
1862 | EvalLocalObjectPartition(tData, axis, nFrontObjects[axis], nBackObjects[axis]);
|
---|
1863 | }
|
---|
1864 |
|
---|
1865 | // avoid splits in degenerate axis with high penalty
|
---|
1866 | if (1 &&
|
---|
1867 | (tData.mNode->GetBoundingBox().Size(axis) < 0.0001))//Limits::Small))
|
---|
1868 | {
|
---|
1869 | nCostRatio[axis] += 9999;
|
---|
1870 | }
|
---|
1871 |
|
---|
1872 | if ((bestAxis == -1) || (nCostRatio[axis] < nCostRatio[bestAxis]))
|
---|
1873 | {
|
---|
1874 | bestAxis = axis;
|
---|
1875 | }
|
---|
1876 | }
|
---|
1877 | }
|
---|
1878 |
|
---|
1879 | ////////////////
|
---|
1880 | //-- assign values
|
---|
1881 |
|
---|
1882 | frontObjects = nFrontObjects[bestAxis];
|
---|
1883 | backObjects = nBackObjects[bestAxis];
|
---|
1884 |
|
---|
1885 | mSplitTimer.Exit();
|
---|
1886 |
|
---|
1887 | //cout << "val: " << nCostRatio[bestAxis] << " axis: " << bestAxis << endl;
|
---|
1888 | return nCostRatio[bestAxis];
|
---|
1889 | }
|
---|
1890 |
|
---|
1891 |
|
---|
1892 | int BvHierarchy::AssociateObjectsWithRays(const VssRayContainer &rays) const
|
---|
1893 | {
|
---|
1894 | int nRays = 0;
|
---|
1895 | VssRayContainer::const_iterator rit, rit_end = rays.end();
|
---|
1896 |
|
---|
1897 | VssRay *lastVssRay = NULL;
|
---|
1898 |
|
---|
1899 | VssRay::NewMail();
|
---|
1900 |
|
---|
1901 | for (rit = rays.begin(); rit != rays.end(); ++ rit)
|
---|
1902 | {
|
---|
1903 | VssRay *ray = (*rit);
|
---|
1904 |
|
---|
1905 | // filter out double rays (last ray the same as this ray)
|
---|
1906 | if (
|
---|
1907 | !lastVssRay ||
|
---|
1908 | !(ray->mOrigin == lastVssRay->mTermination) ||
|
---|
1909 | !(ray->mTermination == lastVssRay->mOrigin))
|
---|
1910 | {
|
---|
1911 | lastVssRay = ray;
|
---|
1912 | //cout << "j";
|
---|
1913 | if (ray->mTerminationObject)
|
---|
1914 | {
|
---|
1915 | ray->mTerminationObject->GetOrCreateRays()->push_back(ray);
|
---|
1916 | if (!ray->Mailed())
|
---|
1917 | {
|
---|
1918 | ray->Mail();
|
---|
1919 | ++ nRays;
|
---|
1920 | }
|
---|
1921 | }
|
---|
1922 |
|
---|
1923 | #if COUNT_ORIGIN_OBJECTS
|
---|
1924 |
|
---|
1925 | if (ray->mOriginObject)
|
---|
1926 | {
|
---|
1927 | //cout << "o";
|
---|
1928 | ray->mOriginObject->GetOrCreateRays()->push_back(ray);
|
---|
1929 |
|
---|
1930 | if (!ray->Mailed())
|
---|
1931 | {
|
---|
1932 | ray->Mail();
|
---|
1933 | ++ nRays;
|
---|
1934 | }
|
---|
1935 | }
|
---|
1936 | #endif
|
---|
1937 | }
|
---|
1938 | }
|
---|
1939 |
|
---|
1940 | return nRays;
|
---|
1941 | }
|
---|
1942 |
|
---|
1943 |
|
---|
1944 | void BvHierarchy::PrintSubdivisionStats(const SubdivisionCandidate &sc)
|
---|
1945 | {
|
---|
1946 | const float costDecr = sc.GetRenderCostDecrease();
|
---|
1947 |
|
---|
1948 | mSubdivisionStats
|
---|
1949 | << "#Leaves\n" << mBvhStats.Leaves() << endl
|
---|
1950 | << "#RenderCostDecrease\n" << costDecr << endl
|
---|
1951 | << "#TotalRenderCost\n" << mTotalCost << endl
|
---|
1952 | << "#EntriesInPvs\n" << mPvsEntries << endl;
|
---|
1953 | }
|
---|
1954 |
|
---|
1955 |
|
---|
1956 | void BvHierarchy::CollectRays(const ObjectContainer &objects,
|
---|
1957 | VssRayContainer &rays) const
|
---|
1958 | {
|
---|
1959 | VssRay::NewMail();
|
---|
1960 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
1961 |
|
---|
1962 | // evaluate reverse pvs and view cell volume on left and right cell
|
---|
1963 | // note: should I take all leaf objects or rather the objects hit by rays?
|
---|
1964 | for (oit = objects.begin(); oit != oit_end; ++ oit)
|
---|
1965 | {
|
---|
1966 | Intersectable *obj = *oit;
|
---|
1967 | VssRayContainer::const_iterator rit, rit_end = obj->GetOrCreateRays()->end();
|
---|
1968 |
|
---|
1969 | for (rit = obj->GetOrCreateRays()->begin(); rit < rit_end; ++ rit)
|
---|
1970 | {
|
---|
1971 | VssRay *ray = (*rit);
|
---|
1972 |
|
---|
1973 | if (!ray->Mailed())
|
---|
1974 | {
|
---|
1975 | ray->Mail();
|
---|
1976 | rays.push_back(ray);
|
---|
1977 | }
|
---|
1978 | }
|
---|
1979 | }
|
---|
1980 | }
|
---|
1981 |
|
---|
1982 |
|
---|
1983 | float BvHierarchy::EvalSahCost(BvhLeaf *leaf) const
|
---|
1984 | {
|
---|
1985 | ////////////////
|
---|
1986 | //-- surface area heuristics
|
---|
1987 |
|
---|
1988 | // eraly exit
|
---|
1989 | //if (leaf->mObjects.empty()) return 0.0f;
|
---|
1990 |
|
---|
1991 | const AxisAlignedBox3 box = GetBoundingBox(leaf);
|
---|
1992 | const float area = box.SurfaceArea();
|
---|
1993 | const float viewSpaceArea = mViewCellsManager->GetViewSpaceBox().SurfaceArea();
|
---|
1994 |
|
---|
1995 | return (float)leaf->mObjects.size() * area / viewSpaceArea;
|
---|
1996 | }
|
---|
1997 |
|
---|
1998 |
|
---|
1999 | float BvHierarchy::EvalRenderCost(const ObjectContainer &objects)// const
|
---|
2000 | {
|
---|
2001 | ///////////////
|
---|
2002 | //-- render cost heuristics
|
---|
2003 |
|
---|
2004 | const float objRenderCost = (float)objects.size();
|
---|
2005 |
|
---|
2006 | const float viewSpaceVol = mViewCellsManager->GetViewSpaceBox().GetVolume();
|
---|
2007 |
|
---|
2008 | // probability that view point lies in a view cell which sees this node
|
---|
2009 | const float p = EvalViewCellsVolume(objects) / viewSpaceVol;
|
---|
2010 |
|
---|
2011 | return objRenderCost * p;
|
---|
2012 | }
|
---|
2013 |
|
---|
2014 |
|
---|
2015 | float BvHierarchy::EvalProbability(const ObjectContainer &objects)// const
|
---|
2016 | {
|
---|
2017 | const float viewSpaceVol = mViewCellsManager->GetViewSpaceBox().GetVolume();
|
---|
2018 |
|
---|
2019 | // probability that view point lies in a view cell which sees this node
|
---|
2020 | return EvalViewCellsVolume(objects) / viewSpaceVol;
|
---|
2021 | }
|
---|
2022 |
|
---|
2023 |
|
---|
2024 | AxisAlignedBox3 BvHierarchy::EvalBoundingBox(const ObjectContainer &objects,
|
---|
2025 | const AxisAlignedBox3 *parentBox) const
|
---|
2026 | {
|
---|
2027 | // if there are no objects in this box, box size is set to parent box size.
|
---|
2028 | // Question: Invalidate box instead?
|
---|
2029 | if (parentBox && objects.empty())
|
---|
2030 | return *parentBox;
|
---|
2031 |
|
---|
2032 | AxisAlignedBox3 box;
|
---|
2033 | box.Initialize();
|
---|
2034 |
|
---|
2035 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
2036 |
|
---|
2037 | for (oit = objects.begin(); oit != oit_end; ++ oit)
|
---|
2038 | {
|
---|
2039 | Intersectable *obj = *oit;
|
---|
2040 | // grow bounding box to include all objects
|
---|
2041 | box.Include(obj->GetBox());
|
---|
2042 | }
|
---|
2043 |
|
---|
2044 | return box;
|
---|
2045 | }
|
---|
2046 |
|
---|
2047 |
|
---|
2048 | void BvHierarchy::CollectLeaves(BvhNode *root, vector<BvhLeaf *> &leaves) const
|
---|
2049 | {
|
---|
2050 | stack<BvhNode *> nodeStack;
|
---|
2051 | nodeStack.push(root);
|
---|
2052 |
|
---|
2053 | while (!nodeStack.empty())
|
---|
2054 | {
|
---|
2055 | BvhNode *node = nodeStack.top();
|
---|
2056 | nodeStack.pop();
|
---|
2057 |
|
---|
2058 | if (node->IsLeaf())
|
---|
2059 | {
|
---|
2060 | BvhLeaf *leaf = (BvhLeaf *)node;
|
---|
2061 | leaves.push_back(leaf);
|
---|
2062 | }
|
---|
2063 | else
|
---|
2064 | {
|
---|
2065 | BvhInterior *interior = (BvhInterior *)node;
|
---|
2066 |
|
---|
2067 | nodeStack.push(interior->GetBack());
|
---|
2068 | nodeStack.push(interior->GetFront());
|
---|
2069 | }
|
---|
2070 | }
|
---|
2071 | }
|
---|
2072 |
|
---|
2073 |
|
---|
2074 | void BvHierarchy::CollectNodes(BvhNode *root, vector<BvhNode *> &nodes) const
|
---|
2075 | {
|
---|
2076 | stack<BvhNode *> nodeStack;
|
---|
2077 | nodeStack.push(root);
|
---|
2078 |
|
---|
2079 | while (!nodeStack.empty())
|
---|
2080 | {
|
---|
2081 | BvhNode *node = nodeStack.top();
|
---|
2082 | nodeStack.pop();
|
---|
2083 |
|
---|
2084 | nodes.push_back(node);
|
---|
2085 |
|
---|
2086 | if (!node->IsLeaf())
|
---|
2087 | {
|
---|
2088 | BvhInterior *interior = (BvhInterior *)node;
|
---|
2089 |
|
---|
2090 | nodeStack.push(interior->GetBack());
|
---|
2091 | nodeStack.push(interior->GetFront());
|
---|
2092 | }
|
---|
2093 | }
|
---|
2094 | }
|
---|
2095 |
|
---|
2096 |
|
---|
2097 | AxisAlignedBox3 BvHierarchy::GetBoundingBox(BvhNode *node) const
|
---|
2098 | {
|
---|
2099 | return node->GetBoundingBox();
|
---|
2100 | }
|
---|
2101 |
|
---|
2102 |
|
---|
2103 | int BvHierarchy::CollectViewCells(const ObjectContainer &objects,
|
---|
2104 | ViewCellContainer &viewCells,
|
---|
2105 | const bool setCounter,
|
---|
2106 | const bool onlyUnmailedRays)// const
|
---|
2107 | {
|
---|
2108 | ViewCell::NewMail();
|
---|
2109 |
|
---|
2110 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
2111 |
|
---|
2112 | // use mailing to avoid dublicates
|
---|
2113 | const bool useMailBoxing = true;
|
---|
2114 |
|
---|
2115 | int numRays = 0;
|
---|
2116 | // loop through all object and collect view cell pvs of this node
|
---|
2117 | for (oit = objects.begin(); oit != oit_end; ++ oit)
|
---|
2118 | {
|
---|
2119 | // use mailing to avoid duplicates
|
---|
2120 | numRays += CollectViewCells(*oit, viewCells, useMailBoxing, setCounter, onlyUnmailedRays);
|
---|
2121 | }
|
---|
2122 |
|
---|
2123 | return numRays;
|
---|
2124 | }
|
---|
2125 |
|
---|
2126 |
|
---|
2127 | #if STORE_VIEWCELLS_WITH_BVH
|
---|
2128 |
|
---|
2129 |
|
---|
2130 | void BvHierarchy::ReleaseViewCells(const ObjectContainer &objects)
|
---|
2131 | {
|
---|
2132 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
2133 |
|
---|
2134 | for (oit = objects.begin(); oit != oit_end; ++ oit)
|
---|
2135 | {
|
---|
2136 | (*oit)->DelViewCells();
|
---|
2137 | }
|
---|
2138 | }
|
---|
2139 |
|
---|
2140 |
|
---|
2141 | void BvHierarchy::AssociateViewCellsWithObjects(const ObjectContainer &objects) const
|
---|
2142 | {
|
---|
2143 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
2144 |
|
---|
2145 | const bool useMailBoxing = true;
|
---|
2146 | VssRay::NewMail();
|
---|
2147 |
|
---|
2148 | for (oit = objects.begin(); oit != oit_end; ++ oit)
|
---|
2149 | {
|
---|
2150 | ViewCell::NewMail();
|
---|
2151 | // use mailing to avoid duplicates
|
---|
2152 | AssociateViewCellsWithObject(*oit, useMailBoxing);
|
---|
2153 | }
|
---|
2154 | }
|
---|
2155 |
|
---|
2156 |
|
---|
2157 | int BvHierarchy::AssociateViewCellsWithObject(Intersectable *obj, const bool useMailBoxing) const
|
---|
2158 | {
|
---|
2159 | int nRays = 0;
|
---|
2160 |
|
---|
2161 | if (!obj->GetOrCreateViewCells()->empty())
|
---|
2162 | {
|
---|
2163 | cerr << "AssociateViewCellsWithObject: view cells cache not working" << endl;
|
---|
2164 | }
|
---|
2165 |
|
---|
2166 | ViewCellContainer *objViewCells = obj->GetOrCreateViewCells();
|
---|
2167 | VssRayContainer *vssRays = obj->GetOrCreateRays();
|
---|
2168 |
|
---|
2169 | VssRayContainer::const_iterator rit, rit_end = vssRays->end();
|
---|
2170 |
|
---|
2171 | // fill cache
|
---|
2172 | for (rit = vssRays->begin(); rit < rit_end; ++ rit)
|
---|
2173 | {
|
---|
2174 | VssRay *ray = (*rit);
|
---|
2175 |
|
---|
2176 | // if (onlyUnmailedRays && ray->Mailed())
|
---|
2177 | // continue;
|
---|
2178 | mHierarchyManager->mVspTree->GetViewCells(*ray, *objViewCells);
|
---|
2179 |
|
---|
2180 | if (!useMailBoxing || !ray->Mailed())
|
---|
2181 | {
|
---|
2182 | if (useMailBoxing)
|
---|
2183 | ray->Mail();
|
---|
2184 |
|
---|
2185 | ++ nRays;
|
---|
2186 | }
|
---|
2187 | }
|
---|
2188 |
|
---|
2189 | return nRays;
|
---|
2190 | }
|
---|
2191 |
|
---|
2192 |
|
---|
2193 |
|
---|
2194 | int BvHierarchy::CountViewCells(Intersectable *obj) //const
|
---|
2195 | {
|
---|
2196 | ViewCellContainer *viewCells = obj->GetOrCreateViewCells();
|
---|
2197 |
|
---|
2198 | if (obj->GetOrCreateViewCells()->empty())
|
---|
2199 | {
|
---|
2200 | //cerr << "h";//CountViewCells: view cells empty, view cells cache not working" << endl;
|
---|
2201 | return CountViewCellsFromRays(obj);
|
---|
2202 | }
|
---|
2203 |
|
---|
2204 | int result = 0;
|
---|
2205 |
|
---|
2206 | ViewCellContainer::const_iterator vit, vit_end = viewCells->end();
|
---|
2207 |
|
---|
2208 | for (vit = viewCells->begin(); vit != vit_end; ++ vit)
|
---|
2209 | {
|
---|
2210 | ViewCell *vc = *vit;
|
---|
2211 |
|
---|
2212 | // store view cells
|
---|
2213 | if (!vc->Mailed())
|
---|
2214 | {
|
---|
2215 | vc->Mail();
|
---|
2216 | ++ result;
|
---|
2217 | }
|
---|
2218 | }
|
---|
2219 |
|
---|
2220 | return result;
|
---|
2221 | }
|
---|
2222 |
|
---|
2223 |
|
---|
2224 | int BvHierarchy::CollectViewCells(Intersectable *obj,
|
---|
2225 | ViewCellContainer &viewCells,
|
---|
2226 | const bool useMailBoxing,
|
---|
2227 | const bool setCounter,
|
---|
2228 | const bool onlyUnmailedRays)// const
|
---|
2229 | {
|
---|
2230 | if (obj->GetOrCreateViewCells()->empty())
|
---|
2231 | {
|
---|
2232 | //cerr << "g";//CollectViewCells: view cells empty, view cells cache not working" << endl;
|
---|
2233 | return CollectViewCellsFromRays(obj, viewCells, useMailBoxing, setCounter, onlyUnmailedRays);
|
---|
2234 | }
|
---|
2235 |
|
---|
2236 | mCollectTimer.Entry();
|
---|
2237 |
|
---|
2238 | ViewCellContainer *objViewCells = obj->GetOrCreateViewCells();
|
---|
2239 |
|
---|
2240 | ///////////
|
---|
2241 | //-- use view cells cache
|
---|
2242 |
|
---|
2243 | // fastest way: just copy to the end
|
---|
2244 | //if (!useMailBoxing) viewCells.insert(viewCells.end(), objViewCells->begin(), objViewCells->end());
|
---|
2245 |
|
---|
2246 | // loop through view cells
|
---|
2247 | // matt: probably slow to insert view cells one by one
|
---|
2248 | ViewCellContainer::const_iterator vit, vit_end = objViewCells->end();
|
---|
2249 |
|
---|
2250 | for (vit = objViewCells->begin(); vit != vit_end; ++ vit)
|
---|
2251 | {
|
---|
2252 | ViewCell *vc = *vit;
|
---|
2253 |
|
---|
2254 | // store view cells
|
---|
2255 | if (!useMailBoxing || !vc->Mailed())
|
---|
2256 | {
|
---|
2257 | if (useMailBoxing)
|
---|
2258 | {
|
---|
2259 | // view cell not mailed
|
---|
2260 | vc->Mail();
|
---|
2261 |
|
---|
2262 | if (setCounter)
|
---|
2263 | vc->mCounter = 0;
|
---|
2264 | //viewCells.push_back(vc);
|
---|
2265 | }
|
---|
2266 |
|
---|
2267 | viewCells.push_back(vc);
|
---|
2268 | }
|
---|
2269 |
|
---|
2270 | if (setCounter)
|
---|
2271 | ++ vc->mCounter;
|
---|
2272 | }
|
---|
2273 |
|
---|
2274 | mCollectTimer.Exit();
|
---|
2275 |
|
---|
2276 | return (int)objViewCells->size();
|
---|
2277 | }
|
---|
2278 |
|
---|
2279 |
|
---|
2280 | int BvHierarchy::CollectViewCellsFromRays(Intersectable *obj,
|
---|
2281 | ViewCellContainer &viewCells,
|
---|
2282 | const bool useMailBoxing,
|
---|
2283 | const bool setCounter,
|
---|
2284 | const bool onlyUnmailedRays)
|
---|
2285 | {
|
---|
2286 | mCollectTimer.Entry();
|
---|
2287 | VssRayContainer::const_iterator rit, rit_end = obj->GetOrCreateRays()->end();
|
---|
2288 |
|
---|
2289 | int numRays = 0;
|
---|
2290 |
|
---|
2291 | for (rit = obj->GetOrCreateRays()->begin(); rit < rit_end; ++ rit)
|
---|
2292 | {
|
---|
2293 | VssRay *ray = (*rit);
|
---|
2294 |
|
---|
2295 | if (onlyUnmailedRays && ray->Mailed())
|
---|
2296 | continue;
|
---|
2297 |
|
---|
2298 | ++ numRays;
|
---|
2299 |
|
---|
2300 | ViewCellContainer tmpViewCells;
|
---|
2301 | mHierarchyManager->mVspTree->GetViewCells(*ray, tmpViewCells);
|
---|
2302 |
|
---|
2303 | // matt: probably slow to allocate memory for view cells every time
|
---|
2304 | ViewCellContainer::const_iterator vit, vit_end = tmpViewCells.end();
|
---|
2305 |
|
---|
2306 | for (vit = tmpViewCells.begin(); vit != vit_end; ++ vit)
|
---|
2307 | {
|
---|
2308 | ViewCell *vc = *vit;
|
---|
2309 |
|
---|
2310 | // store view cells
|
---|
2311 | if (!useMailBoxing || !vc->Mailed())
|
---|
2312 | {
|
---|
2313 | if (useMailBoxing) // => view cell not mailed
|
---|
2314 | {
|
---|
2315 | vc->Mail();
|
---|
2316 | if (setCounter)
|
---|
2317 | vc->mCounter = 0;
|
---|
2318 | }
|
---|
2319 |
|
---|
2320 | viewCells.push_back(vc);
|
---|
2321 | }
|
---|
2322 |
|
---|
2323 | if (setCounter)
|
---|
2324 | ++ vc->mCounter;
|
---|
2325 | }
|
---|
2326 | }
|
---|
2327 |
|
---|
2328 | mCollectTimer.Exit();
|
---|
2329 | return numRays;
|
---|
2330 | }
|
---|
2331 |
|
---|
2332 |
|
---|
2333 | int BvHierarchy::CountViewCellsFromRays(Intersectable *obj) //const
|
---|
2334 | {
|
---|
2335 | int result = 0;
|
---|
2336 |
|
---|
2337 | VssRayContainer::const_iterator rit, rit_end = obj->GetOrCreateRays()->end();
|
---|
2338 |
|
---|
2339 | for (rit = obj->GetOrCreateRays()->begin(); rit < rit_end; ++ rit)
|
---|
2340 | {
|
---|
2341 | VssRay *ray = (*rit);
|
---|
2342 | ViewCellContainer tmpViewCells;
|
---|
2343 |
|
---|
2344 | mHierarchyManager->mVspTree->GetViewCells(*ray, tmpViewCells);
|
---|
2345 |
|
---|
2346 | ViewCellContainer::const_iterator vit, vit_end = tmpViewCells.end();
|
---|
2347 | for (vit = tmpViewCells.begin(); vit != vit_end; ++ vit)
|
---|
2348 | {
|
---|
2349 | ViewCell *vc = *vit;
|
---|
2350 |
|
---|
2351 | // store view cells
|
---|
2352 | if (!vc->Mailed())
|
---|
2353 | {
|
---|
2354 | vc->Mail();
|
---|
2355 | ++ result;
|
---|
2356 | }
|
---|
2357 | }
|
---|
2358 | }
|
---|
2359 |
|
---|
2360 | return result;
|
---|
2361 | }
|
---|
2362 |
|
---|
2363 | #else
|
---|
2364 |
|
---|
2365 | int BvHierarchy::CountViewCells(Intersectable *obj) //const
|
---|
2366 | {
|
---|
2367 | int result = 0;
|
---|
2368 |
|
---|
2369 | VssRayContainer::const_iterator rit, rit_end = obj->GetOrCreateRays()->end();
|
---|
2370 |
|
---|
2371 | for (rit = obj->GetOrCreateRays()->begin(); rit < rit_end; ++ rit)
|
---|
2372 | {
|
---|
2373 | VssRay *ray = (*rit);
|
---|
2374 | ViewCellContainer tmpViewCells;
|
---|
2375 |
|
---|
2376 | mHierarchyManager->mVspTree->GetViewCells(*ray, tmpViewCells);
|
---|
2377 |
|
---|
2378 | ViewCellContainer::const_iterator vit, vit_end = tmpViewCells.end();
|
---|
2379 | for (vit = tmpViewCells.begin(); vit != vit_end; ++ vit)
|
---|
2380 | {
|
---|
2381 | ViewCell *vc = *vit;
|
---|
2382 |
|
---|
2383 | // store view cells
|
---|
2384 | if (!vc->Mailed())
|
---|
2385 | {
|
---|
2386 | vc->Mail();
|
---|
2387 | ++ result;
|
---|
2388 | }
|
---|
2389 | }
|
---|
2390 | }
|
---|
2391 |
|
---|
2392 | return result;
|
---|
2393 | }
|
---|
2394 |
|
---|
2395 |
|
---|
2396 | int BvHierarchy::CollectViewCells(Intersectable *obj,
|
---|
2397 | ViewCellContainer &viewCells,
|
---|
2398 | const bool useMailBoxing,
|
---|
2399 | const bool setCounter,
|
---|
2400 | const bool onlyUnmailedRays)
|
---|
2401 | {
|
---|
2402 | mCollectTimer.Entry();
|
---|
2403 | VssRayContainer::const_iterator rit, rit_end = obj->GetOrCreateRays()->end();
|
---|
2404 |
|
---|
2405 | int numRays = 0;
|
---|
2406 |
|
---|
2407 | for (rit = obj->GetOrCreateRays()->begin(); rit < rit_end; ++ rit)
|
---|
2408 | {
|
---|
2409 | VssRay *ray = (*rit);
|
---|
2410 |
|
---|
2411 | if (onlyUnmailedRays && ray->Mailed())
|
---|
2412 | continue;
|
---|
2413 |
|
---|
2414 | ++ numRays;
|
---|
2415 |
|
---|
2416 | ViewCellContainer tmpViewCells;
|
---|
2417 | mHierarchyManager->mVspTree->GetViewCells(*ray, tmpViewCells);
|
---|
2418 |
|
---|
2419 | // matt: probably slow to allocate memory for view cells every time
|
---|
2420 | ViewCellContainer::const_iterator vit, vit_end = tmpViewCells.end();
|
---|
2421 |
|
---|
2422 | for (vit = tmpViewCells.begin(); vit != vit_end; ++ vit)
|
---|
2423 | {
|
---|
2424 | ViewCell *vc = *vit;
|
---|
2425 |
|
---|
2426 | // store view cells
|
---|
2427 | if (!useMailBoxing || !vc->Mailed())
|
---|
2428 | {
|
---|
2429 | if (useMailBoxing) // => view cell not mailed
|
---|
2430 | {
|
---|
2431 | vc->Mail();
|
---|
2432 | if (setCounter)
|
---|
2433 | vc->mCounter = 0;
|
---|
2434 | }
|
---|
2435 |
|
---|
2436 | viewCells.push_back(vc);
|
---|
2437 | }
|
---|
2438 |
|
---|
2439 | if (setCounter)
|
---|
2440 | ++ vc->mCounter;
|
---|
2441 | }
|
---|
2442 | }
|
---|
2443 |
|
---|
2444 | mCollectTimer.Exit();
|
---|
2445 | return numRays;
|
---|
2446 | }
|
---|
2447 | #endif
|
---|
2448 |
|
---|
2449 |
|
---|
2450 | int BvHierarchy::CountViewCells(const ObjectContainer &objects)// const
|
---|
2451 | {
|
---|
2452 | int nViewCells = 0;
|
---|
2453 |
|
---|
2454 | ViewCell::NewMail();
|
---|
2455 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
2456 |
|
---|
2457 | // loop through all object and collect view cell pvs of this node
|
---|
2458 | for (oit = objects.begin(); oit != oit_end; ++ oit)
|
---|
2459 | {
|
---|
2460 | nViewCells += CountViewCells(*oit);
|
---|
2461 | }
|
---|
2462 |
|
---|
2463 | return nViewCells;
|
---|
2464 | }
|
---|
2465 |
|
---|
2466 |
|
---|
2467 | void BvHierarchy::CollectDirtyCandidates(BvhSubdivisionCandidate *sc,
|
---|
2468 | vector<SubdivisionCandidate *> &dirtyList,
|
---|
2469 | const bool onlyUnmailed)
|
---|
2470 | {
|
---|
2471 | BvhTraversalData &tData = sc->mParentData;
|
---|
2472 | BvhLeaf *node = tData.mNode;
|
---|
2473 |
|
---|
2474 | ViewCellContainer viewCells;
|
---|
2475 | //ViewCell::NewMail();
|
---|
2476 | int numRays = CollectViewCells(*tData.mSampledObjects, viewCells, false, false);
|
---|
2477 |
|
---|
2478 | if (0) cout << "collected " << (int)viewCells.size() << " dirty candidates" << endl;
|
---|
2479 |
|
---|
2480 | // split candidates handling
|
---|
2481 | // these view cells are thrown into dirty list
|
---|
2482 | ViewCellContainer::const_iterator vit, vit_end = viewCells.end();
|
---|
2483 |
|
---|
2484 | for (vit = viewCells.begin(); vit != vit_end; ++ vit)
|
---|
2485 | {
|
---|
2486 | VspViewCell *vc = static_cast<VspViewCell *>(*vit);
|
---|
2487 | VspLeaf *leaf = vc->mLeaves[0];
|
---|
2488 |
|
---|
2489 | SubdivisionCandidate *candidate = leaf->GetSubdivisionCandidate();
|
---|
2490 |
|
---|
2491 | // is this leaf still a split candidate?
|
---|
2492 | if (candidate && (!onlyUnmailed || !candidate->Mailed()))
|
---|
2493 | {
|
---|
2494 | candidate->Mail();
|
---|
2495 | candidate->SetDirty(true);
|
---|
2496 | dirtyList.push_back(candidate);
|
---|
2497 | }
|
---|
2498 | }
|
---|
2499 | }
|
---|
2500 |
|
---|
2501 |
|
---|
2502 | BvhNode *BvHierarchy::GetRoot() const
|
---|
2503 | {
|
---|
2504 | return mRoot;
|
---|
2505 | }
|
---|
2506 |
|
---|
2507 |
|
---|
2508 | bool BvHierarchy::IsObjectInLeaf(BvhLeaf *leaf, Intersectable *object) const
|
---|
2509 | {
|
---|
2510 | ObjectContainer::const_iterator oit =
|
---|
2511 | lower_bound(leaf->mObjects.begin(), leaf->mObjects.end(), object, ilt);
|
---|
2512 |
|
---|
2513 | // objects sorted by id
|
---|
2514 | if ((oit != leaf->mObjects.end()) && ((*oit)->GetId() == object->GetId()))
|
---|
2515 | {
|
---|
2516 | return true;
|
---|
2517 | }
|
---|
2518 | else
|
---|
2519 | {
|
---|
2520 | return false;
|
---|
2521 | }
|
---|
2522 | }
|
---|
2523 |
|
---|
2524 | #if 0
|
---|
2525 | BvhLeaf *BvHierarchy::GetLeaf(Intersectable *object, BvhNode *node) const
|
---|
2526 | {
|
---|
2527 | // hack: we use the simpler but faster version
|
---|
2528 | if (!object)
|
---|
2529 | return NULL;
|
---|
2530 |
|
---|
2531 | return object->mBvhLeaf;
|
---|
2532 |
|
---|
2533 | ///////////////////////////////////////
|
---|
2534 | // start from root of tree
|
---|
2535 |
|
---|
2536 | if (node == NULL)
|
---|
2537 | node = mRoot;
|
---|
2538 |
|
---|
2539 | vector<BvhLeaf *> leaves;
|
---|
2540 |
|
---|
2541 | stack<BvhNode *> nodeStack;
|
---|
2542 | nodeStack.push(node);
|
---|
2543 |
|
---|
2544 | BvhLeaf *leaf = NULL;
|
---|
2545 |
|
---|
2546 | while (!nodeStack.empty())
|
---|
2547 | {
|
---|
2548 | BvhNode *node = nodeStack.top();
|
---|
2549 | nodeStack.pop();
|
---|
2550 |
|
---|
2551 | if (node->IsLeaf())
|
---|
2552 | {
|
---|
2553 | leaf = static_cast<BvhLeaf *>(node);
|
---|
2554 |
|
---|
2555 | if (IsObjectInLeaf(leaf, object))
|
---|
2556 | {
|
---|
2557 | return leaf;
|
---|
2558 | }
|
---|
2559 | }
|
---|
2560 | else
|
---|
2561 | {
|
---|
2562 | // find point
|
---|
2563 | BvhInterior *interior = static_cast<BvhInterior *>(node);
|
---|
2564 |
|
---|
2565 | if (interior->GetBack()->GetBoundingBox().Includes(object->GetBox()))
|
---|
2566 | {
|
---|
2567 | nodeStack.push(interior->GetBack());
|
---|
2568 | }
|
---|
2569 |
|
---|
2570 | // search both sides as we are using bounding volumes
|
---|
2571 | if (interior->GetFront()->GetBoundingBox().Includes(object->GetBox()))
|
---|
2572 | {
|
---|
2573 | nodeStack.push(interior->GetFront());
|
---|
2574 | }
|
---|
2575 | }
|
---|
2576 | }
|
---|
2577 |
|
---|
2578 | return leaf;
|
---|
2579 | }
|
---|
2580 | #endif
|
---|
2581 |
|
---|
2582 | bool BvHierarchy::Export(OUT_STREAM &stream)
|
---|
2583 | {
|
---|
2584 | ExportNode(mRoot, stream);
|
---|
2585 |
|
---|
2586 | return true;
|
---|
2587 | }
|
---|
2588 |
|
---|
2589 |
|
---|
2590 | void BvHierarchy::ExportObjects(BvhLeaf *leaf, OUT_STREAM &stream)
|
---|
2591 | {
|
---|
2592 | ObjectContainer::const_iterator oit, oit_end = leaf->mObjects.end();
|
---|
2593 |
|
---|
2594 | for (oit = leaf->mObjects.begin(); oit != oit_end; ++ oit)
|
---|
2595 | {
|
---|
2596 | stream << (*oit)->GetId() << " ";
|
---|
2597 | }
|
---|
2598 | }
|
---|
2599 |
|
---|
2600 |
|
---|
2601 | void BvHierarchy::ExportNode(BvhNode *node, OUT_STREAM &stream)
|
---|
2602 | {
|
---|
2603 | if (node->IsLeaf())
|
---|
2604 | {
|
---|
2605 | BvhLeaf *leaf = static_cast<BvhLeaf *>(node);
|
---|
2606 | const AxisAlignedBox3 box = leaf->GetBoundingBox();
|
---|
2607 | stream << "<Leaf id=\"" << node->GetId() << "\""
|
---|
2608 | << " min=\"" << box.Min().x << " " << box.Min().y << " " << box.Min().z << "\""
|
---|
2609 | << " max=\"" << box.Max().x << " " << box.Max().y << " " << box.Max().z << "\""
|
---|
2610 | << " objects=\"";
|
---|
2611 |
|
---|
2612 | //-- export objects
|
---|
2613 | // tmp matt
|
---|
2614 | if (1) ExportObjects(leaf, stream);
|
---|
2615 |
|
---|
2616 | stream << "\" />" << endl;
|
---|
2617 | }
|
---|
2618 | else
|
---|
2619 | {
|
---|
2620 | BvhInterior *interior = static_cast<BvhInterior *>(node);
|
---|
2621 | const AxisAlignedBox3 box = interior->GetBoundingBox();
|
---|
2622 |
|
---|
2623 | stream << "<Interior id=\"" << node->GetId() << "\""
|
---|
2624 | << " min=\"" << box.Min().x << " " << box.Min().y << " " << box.Min().z << "\""
|
---|
2625 | << " max=\"" << box.Max().x << " " << box.Max().y << " " << box.Max().z
|
---|
2626 | << "\">" << endl;
|
---|
2627 |
|
---|
2628 | ExportNode(interior->GetBack(), stream);
|
---|
2629 | ExportNode(interior->GetFront(), stream);
|
---|
2630 |
|
---|
2631 | stream << "</Interior>" << endl;
|
---|
2632 | }
|
---|
2633 | }
|
---|
2634 |
|
---|
2635 |
|
---|
2636 | float BvHierarchy::EvalViewCellsVolume(const ObjectContainer &objects)// const
|
---|
2637 | {
|
---|
2638 | float vol = 0;
|
---|
2639 |
|
---|
2640 | ViewCellContainer viewCells;
|
---|
2641 |
|
---|
2642 | // we have to account for all view cells that can
|
---|
2643 | // be seen from the objects
|
---|
2644 | int numRays = CollectViewCells(objects, viewCells, false, false);
|
---|
2645 |
|
---|
2646 | ViewCellContainer::const_iterator vit, vit_end = viewCells.end();
|
---|
2647 |
|
---|
2648 | for (vit = viewCells.begin(); vit != vit_end; ++ vit)
|
---|
2649 | {
|
---|
2650 | vol += (*vit)->GetVolume();
|
---|
2651 | }
|
---|
2652 |
|
---|
2653 | return vol;
|
---|
2654 | }
|
---|
2655 |
|
---|
2656 |
|
---|
2657 | void BvHierarchy::Initialise(const ObjectContainer &objects)
|
---|
2658 | {
|
---|
2659 | AxisAlignedBox3 box = EvalBoundingBox(objects);
|
---|
2660 |
|
---|
2661 | ///////
|
---|
2662 | //-- create new root
|
---|
2663 |
|
---|
2664 | BvhLeaf *bvhleaf = new BvhLeaf(box, NULL, (int)objects.size());
|
---|
2665 | bvhleaf->mObjects = objects;
|
---|
2666 | mRoot = bvhleaf;
|
---|
2667 |
|
---|
2668 | // compute bounding box from objects
|
---|
2669 | mBoundingBox = mRoot->GetBoundingBox();
|
---|
2670 |
|
---|
2671 | // associate root with current objects
|
---|
2672 | AssociateObjectsWithLeaf(bvhleaf);
|
---|
2673 | }
|
---|
2674 |
|
---|
2675 |
|
---|
2676 | void BvHierarchy::StoreSampledObjects(ObjectContainer &sampledObjects, const ObjectContainer &objects)
|
---|
2677 | {
|
---|
2678 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
2679 |
|
---|
2680 | for (oit = objects.begin(); oit != objects.end(); ++ oit)
|
---|
2681 | {
|
---|
2682 | Intersectable *obj = *oit;
|
---|
2683 |
|
---|
2684 | if (!obj->GetOrCreateRays()->empty())
|
---|
2685 | {
|
---|
2686 | sampledObjects.push_back(obj);
|
---|
2687 | }
|
---|
2688 | }
|
---|
2689 | }
|
---|
2690 |
|
---|
2691 |
|
---|
2692 | void BvHierarchy::PrepareConstruction(SplitQueue &tQueue,
|
---|
2693 | const VssRayContainer &sampleRays,
|
---|
2694 | const ObjectContainer &objects)
|
---|
2695 | {
|
---|
2696 | ///////////////////////////////////////
|
---|
2697 | //-- we assume that we have objects sorted by their id =>
|
---|
2698 | //-- we don't have to sort them here and an binary search
|
---|
2699 | //-- for identifying if a object is in a leaf.
|
---|
2700 |
|
---|
2701 | mBvhStats.Reset();
|
---|
2702 | mBvhStats.Start();
|
---|
2703 | mBvhStats.nodes = 1;
|
---|
2704 |
|
---|
2705 | // store pointer to this tree
|
---|
2706 | BvhSubdivisionCandidate::sBvHierarchy = this;
|
---|
2707 |
|
---|
2708 | // root and bounding box was already constructed
|
---|
2709 | BvhLeaf *bvhLeaf = static_cast<BvhLeaf *>(mRoot);
|
---|
2710 |
|
---|
2711 | // only rays intersecting objects in node are interesting
|
---|
2712 | const int nRays = AssociateObjectsWithRays(sampleRays);
|
---|
2713 | //cout << "using " << nRays << " of " << (int)sampleRays.size() << " rays" << endl;
|
---|
2714 |
|
---|
2715 | ObjectContainer *sampledObjects = new ObjectContainer();
|
---|
2716 | StoreSampledObjects(*sampledObjects, objects);
|
---|
2717 |
|
---|
2718 | #if STORE_VIEWCELLS_WITH_BVH
|
---|
2719 | AssociateViewCellsWithObjects(*sampledObjects);
|
---|
2720 | #endif
|
---|
2721 |
|
---|
2722 | // probability that volume is "seen" from the view cells
|
---|
2723 | const float prop = EvalViewCellsVolume(*sampledObjects) / GetViewSpaceVolume();
|
---|
2724 |
|
---|
2725 | // create bvh traversal data
|
---|
2726 | BvhTraversalData oData(bvhLeaf, 0, prop, nRays);
|
---|
2727 |
|
---|
2728 | // create sorted object lists for the first data
|
---|
2729 | if (mUseGlobalSorting)
|
---|
2730 | {
|
---|
2731 | AssignInitialSortedObjectList(oData, objects);
|
---|
2732 | }
|
---|
2733 |
|
---|
2734 | oData.mSampledObjects = sampledObjects;
|
---|
2735 |
|
---|
2736 | ///////////////////
|
---|
2737 | //-- add first candidate for object space partition
|
---|
2738 |
|
---|
2739 | mTotalCost = EvalRenderCost(objects);
|
---|
2740 | mPvsEntries = CountViewCells(*sampledObjects);
|
---|
2741 |
|
---|
2742 | oData.mCorrectedPvs = oData.mPvs = (float)mPvsEntries;
|
---|
2743 | oData.mCorrectedVolume = oData.mVolume = prop;
|
---|
2744 |
|
---|
2745 | BvhSubdivisionCandidate *oSubdivisionCandidate =
|
---|
2746 | new BvhSubdivisionCandidate(oData);
|
---|
2747 |
|
---|
2748 | bvhLeaf->SetSubdivisionCandidate(oSubdivisionCandidate);
|
---|
2749 |
|
---|
2750 | #if STORE_VIEWCELLS_WITH_BVH
|
---|
2751 | ReleaseViewCells(*sampledObjects);
|
---|
2752 | #endif
|
---|
2753 |
|
---|
2754 | if (mApplyInitialPartition)
|
---|
2755 | {
|
---|
2756 | vector<SubdivisionCandidate *> candidateContainer;
|
---|
2757 |
|
---|
2758 | mIsInitialSubdivision = true;
|
---|
2759 |
|
---|
2760 | // evaluate priority
|
---|
2761 | EvalSubdivisionCandidate(*oSubdivisionCandidate, true, true);
|
---|
2762 | PrintSubdivisionStats(*oSubdivisionCandidate);
|
---|
2763 |
|
---|
2764 | ApplyInitialSubdivision(oSubdivisionCandidate, candidateContainer);
|
---|
2765 |
|
---|
2766 | mIsInitialSubdivision = false;
|
---|
2767 |
|
---|
2768 | vector<SubdivisionCandidate *>::const_iterator cit, cit_end = candidateContainer.end();
|
---|
2769 |
|
---|
2770 | for (cit = candidateContainer.begin(); cit != cit_end; ++ cit)
|
---|
2771 | {
|
---|
2772 | BvhSubdivisionCandidate *sCandidate = static_cast<BvhSubdivisionCandidate *>(*cit);
|
---|
2773 |
|
---|
2774 | // reevaluate priority
|
---|
2775 | EvalSubdivisionCandidate(*sCandidate, true, true);
|
---|
2776 | tQueue.Push(sCandidate);
|
---|
2777 | }
|
---|
2778 |
|
---|
2779 | cout << "size of initial bv subdivision: " << GetStatistics().Leaves() << endl;
|
---|
2780 | }
|
---|
2781 | else
|
---|
2782 | {
|
---|
2783 | // evaluate priority
|
---|
2784 | EvalSubdivisionCandidate(*oSubdivisionCandidate, true, true);
|
---|
2785 | PrintSubdivisionStats(*oSubdivisionCandidate);
|
---|
2786 |
|
---|
2787 | tQueue.Push(oSubdivisionCandidate);
|
---|
2788 | cout << "size of initial bv subdivision: " << GetStatistics().Leaves() << endl;
|
---|
2789 | }
|
---|
2790 | }
|
---|
2791 |
|
---|
2792 |
|
---|
2793 | void BvHierarchy::AssignInitialSortedObjectList(BvhTraversalData &tData,
|
---|
2794 | const ObjectContainer &objects)
|
---|
2795 | {
|
---|
2796 | const bool doSort = true;
|
---|
2797 |
|
---|
2798 | // we sort the objects as a preprocess so they don't have
|
---|
2799 | // to be sorted for each split
|
---|
2800 | for (int i = 0; i < 3; ++ i)
|
---|
2801 | {
|
---|
2802 | SortableEntryContainer *sortedObjects = new SortableEntryContainer();
|
---|
2803 |
|
---|
2804 | CreateLocalSubdivisionCandidates(objects,
|
---|
2805 | &sortedObjects,
|
---|
2806 | doSort,
|
---|
2807 | i);
|
---|
2808 |
|
---|
2809 | // copy list into traversal data list
|
---|
2810 | tData.mSortedObjects[i] = new ObjectContainer();
|
---|
2811 | tData.mSortedObjects[i]->reserve((int)objects.size());
|
---|
2812 |
|
---|
2813 | SortableEntryContainer::const_iterator oit, oit_end = sortedObjects->end();
|
---|
2814 |
|
---|
2815 | for (oit = sortedObjects->begin(); oit != oit_end; ++ oit)
|
---|
2816 | {
|
---|
2817 | tData.mSortedObjects[i]->push_back((*oit).mObject);
|
---|
2818 | }
|
---|
2819 |
|
---|
2820 | delete sortedObjects;
|
---|
2821 | }
|
---|
2822 |
|
---|
2823 | // next sorted list: by size (for initial criteria)
|
---|
2824 | tData.mSortedObjects[3] = new ObjectContainer();
|
---|
2825 | tData.mSortedObjects[3]->reserve((int)objects.size());
|
---|
2826 |
|
---|
2827 | *(tData.mSortedObjects[3]) = objects;
|
---|
2828 |
|
---|
2829 | stable_sort(tData.mSortedObjects[3]->begin(), tData.mSortedObjects[3]->end(), smallerSize);
|
---|
2830 | }
|
---|
2831 |
|
---|
2832 |
|
---|
2833 | void BvHierarchy::AssignSortedObjects(const BvhSubdivisionCandidate &sc,
|
---|
2834 | BvhTraversalData &frontData,
|
---|
2835 | BvhTraversalData &backData)
|
---|
2836 | {
|
---|
2837 | Intersectable::NewMail();
|
---|
2838 |
|
---|
2839 | // we sorted the objects as a preprocess so they don't have
|
---|
2840 | // to be sorted for each split
|
---|
2841 | ObjectContainer::const_iterator fit, fit_end = sc.mFrontObjects.end();
|
---|
2842 |
|
---|
2843 | for (fit = sc.mFrontObjects.begin(); fit != fit_end; ++ fit)
|
---|
2844 | {
|
---|
2845 | (*fit)->Mail();
|
---|
2846 | }
|
---|
2847 |
|
---|
2848 | for (int i = 0; i < 4; ++ i)
|
---|
2849 | {
|
---|
2850 | frontData.mSortedObjects[i] = new ObjectContainer();
|
---|
2851 | backData.mSortedObjects[i] = new ObjectContainer();
|
---|
2852 |
|
---|
2853 | frontData.mSortedObjects[i]->reserve((int)sc.mFrontObjects.size());
|
---|
2854 | backData.mSortedObjects[i]->reserve((int)sc.mBackObjects.size());
|
---|
2855 |
|
---|
2856 | ObjectContainer::const_iterator oit, oit_end = sc.mParentData.mSortedObjects[i]->end();
|
---|
2857 |
|
---|
2858 | // all the front objects are mailed => assign the sorted object lists
|
---|
2859 | for (oit = sc.mParentData.mSortedObjects[i]->begin(); oit != oit_end; ++ oit)
|
---|
2860 | {
|
---|
2861 | if ((*oit)->Mailed())
|
---|
2862 | {
|
---|
2863 | frontData.mSortedObjects[i]->push_back(*oit);
|
---|
2864 | }
|
---|
2865 | else
|
---|
2866 | {
|
---|
2867 | backData.mSortedObjects[i]->push_back(*oit);
|
---|
2868 | }
|
---|
2869 | }
|
---|
2870 | }
|
---|
2871 | }
|
---|
2872 |
|
---|
2873 |
|
---|
2874 | void BvHierarchy::Reset(SplitQueue &tQueue,
|
---|
2875 | const VssRayContainer &sampleRays,
|
---|
2876 | const ObjectContainer &objects)
|
---|
2877 | {
|
---|
2878 |
|
---|
2879 | // reset stats
|
---|
2880 | mBvhStats.Reset();
|
---|
2881 | mBvhStats.Start();
|
---|
2882 | mBvhStats.nodes = 1;
|
---|
2883 |
|
---|
2884 | // reset root
|
---|
2885 | DEL_PTR(mRoot);
|
---|
2886 |
|
---|
2887 | BvhLeaf *bvhleaf = new BvhLeaf(mBoundingBox, NULL, (int)objects.size());
|
---|
2888 | bvhleaf->mObjects = objects;
|
---|
2889 | mRoot = bvhleaf;
|
---|
2890 |
|
---|
2891 | ObjectContainer *sampledObjects = new ObjectContainer();
|
---|
2892 | StoreSampledObjects(*sampledObjects, objects);
|
---|
2893 |
|
---|
2894 | #if STORE_VIEWCELLS_WITH_BVH
|
---|
2895 | AssociateViewCellsWithObjects(*sampledObjects);
|
---|
2896 | #endif
|
---|
2897 |
|
---|
2898 | //mTermMinProbability *= mVspTree->GetBoundingBox().GetVolume();
|
---|
2899 | // probability that volume is "seen" from the view cells
|
---|
2900 | const float viewSpaceVol = mViewCellsManager->GetViewSpaceBox().GetVolume();
|
---|
2901 | const float prop = EvalViewCellsVolume(*sampledObjects);
|
---|
2902 |
|
---|
2903 | const int nRays = CountRays(*sampledObjects);
|
---|
2904 | BvhLeaf *bvhLeaf = static_cast<BvhLeaf *>(mRoot);
|
---|
2905 |
|
---|
2906 | // create bvh traversal data
|
---|
2907 | BvhTraversalData oData(bvhLeaf, 0, prop, nRays);
|
---|
2908 |
|
---|
2909 | oData.mSampledObjects = sampledObjects;
|
---|
2910 |
|
---|
2911 | if (mUseGlobalSorting)
|
---|
2912 | AssignInitialSortedObjectList(oData, objects);
|
---|
2913 |
|
---|
2914 | #if STORE_VIEWCELLS_WITH_BVH
|
---|
2915 | ReleaseViewCells(*sampledObjects);
|
---|
2916 | #endif
|
---|
2917 | ///////////////////
|
---|
2918 | //-- add first candidate for object space partition
|
---|
2919 |
|
---|
2920 | BvhSubdivisionCandidate *oSubdivisionCandidate =
|
---|
2921 | new BvhSubdivisionCandidate(oData);
|
---|
2922 |
|
---|
2923 | EvalSubdivisionCandidate(*oSubdivisionCandidate, true, true);
|
---|
2924 | bvhLeaf->SetSubdivisionCandidate(oSubdivisionCandidate);
|
---|
2925 |
|
---|
2926 | mTotalCost = (float)objects.size() * prop;
|
---|
2927 |
|
---|
2928 | PrintSubdivisionStats(*oSubdivisionCandidate);
|
---|
2929 |
|
---|
2930 | tQueue.Push(oSubdivisionCandidate);
|
---|
2931 | }
|
---|
2932 |
|
---|
2933 |
|
---|
2934 | void BvhStatistics::Print(ostream &app) const
|
---|
2935 | {
|
---|
2936 | app << "=========== BvHierarchy statistics ===============\n";
|
---|
2937 |
|
---|
2938 | app << setprecision(4);
|
---|
2939 |
|
---|
2940 | app << "#N_CTIME ( Construction time [s] )\n" << Time() << " \n";
|
---|
2941 |
|
---|
2942 | app << "#N_NODES ( Number of nodes )\n" << nodes << "\n";
|
---|
2943 |
|
---|
2944 | app << "#N_INTERIORS ( Number of interior nodes )\n" << Interior() << "\n";
|
---|
2945 |
|
---|
2946 | app << "#N_LEAVES ( Number of leaves )\n" << Leaves() << "\n";
|
---|
2947 |
|
---|
2948 | app << "#AXIS_ALIGNED_SPLITS (number of axis aligned splits)\n" << splits << endl;
|
---|
2949 |
|
---|
2950 | app << "#N_MAXCOSTNODES ( Percentage of leaves with terminated because of max cost ratio )\n"
|
---|
2951 | << maxCostNodes * 100 / (double)Leaves() << endl;
|
---|
2952 |
|
---|
2953 | app << "#N_PMINPROBABILITYLEAVES ( Percentage of leaves with mininum probability )\n"
|
---|
2954 | << minProbabilityNodes * 100 / (double)Leaves() << endl;
|
---|
2955 |
|
---|
2956 |
|
---|
2957 | //////////////////////////////////////////////////
|
---|
2958 |
|
---|
2959 | app << "#N_PMAXDEPTHLEAVES ( Percentage of leaves at maximum depth )\n"
|
---|
2960 | << maxDepthNodes * 100 / (double)Leaves() << endl;
|
---|
2961 |
|
---|
2962 | app << "#N_PMAXDEPTH ( Maximal reached depth )\n" << maxDepth << endl;
|
---|
2963 |
|
---|
2964 | app << "#N_PMINDEPTH ( Minimal reached depth )\n" << minDepth << endl;
|
---|
2965 |
|
---|
2966 | app << "#AVGDEPTH ( average depth )\n" << AvgDepth() << endl;
|
---|
2967 |
|
---|
2968 |
|
---|
2969 | ////////////////////////////////////////////////////////
|
---|
2970 |
|
---|
2971 | app << "#N_PMINOBJECTSLEAVES ( Percentage of leaves with mininum objects )\n"
|
---|
2972 | << minObjectsNodes * 100 / (double)Leaves() << endl;
|
---|
2973 |
|
---|
2974 | app << "#N_MAXOBJECTREFS ( Max number of object refs / leaf )\n" << maxObjectRefs << "\n";
|
---|
2975 |
|
---|
2976 | app << "#N_MINOBJECTREFS ( Min number of object refs / leaf )\n" << minObjectRefs << "\n";
|
---|
2977 |
|
---|
2978 | app << "#N_EMPTYLEAFS ( Empty leafs )\n" << emptyNodes << "\n";
|
---|
2979 |
|
---|
2980 | app << "#N_PAVGOBJECTSLEAVES ( average object refs / leaf)\n" << AvgObjectRefs() << endl;
|
---|
2981 |
|
---|
2982 |
|
---|
2983 | ////////////////////////////////////////////////////////
|
---|
2984 |
|
---|
2985 | app << "#N_PMINRAYSLEAVES ( Percentage of leaves with mininum rays )\n"
|
---|
2986 | << minRaysNodes * 100 / (double)Leaves() << endl;
|
---|
2987 |
|
---|
2988 | app << "#N_MAXRAYREFS ( Max number of ray refs / leaf )\n" << maxRayRefs << "\n";
|
---|
2989 |
|
---|
2990 | app << "#N_MINRAYREFS ( Min number of ray refs / leaf )\n" << minRayRefs << "\n";
|
---|
2991 |
|
---|
2992 | app << "#N_PAVGRAYLEAVES ( average ray refs / leaf )\n" << AvgRayRefs() << endl;
|
---|
2993 |
|
---|
2994 | app << "#N_PAVGRAYCONTRIBLEAVES ( Average ray contribution)\n" <<
|
---|
2995 | rayRefs / (double)objectRefs << endl;
|
---|
2996 |
|
---|
2997 | app << "#N_PMAXRAYCONTRIBLEAVES ( Percentage of leaves with maximal ray contribution )\n"<<
|
---|
2998 | maxRayContriNodes * 100 / (double)Leaves() << endl;
|
---|
2999 |
|
---|
3000 | app << "#N_PGLOBALCOSTMISSES ( Global cost misses )\n" << mGlobalCostMisses << endl;
|
---|
3001 |
|
---|
3002 | app << "========== END OF BvHierarchy statistics ==========\n";
|
---|
3003 | }
|
---|
3004 |
|
---|
3005 |
|
---|
3006 | // TODO: return memory usage in MB
|
---|
3007 | float BvHierarchy::GetMemUsage() const
|
---|
3008 | {
|
---|
3009 | return (float)(sizeof(BvHierarchy)
|
---|
3010 | + mBvhStats.Leaves() * sizeof(BvhLeaf)
|
---|
3011 | + mBvhStats.Interior() * sizeof(BvhInterior)
|
---|
3012 | ) / float(1024 * 1024);
|
---|
3013 | }
|
---|
3014 |
|
---|
3015 |
|
---|
3016 | void BvHierarchy::SetActive(BvhNode *node) const
|
---|
3017 | {
|
---|
3018 | vector<BvhLeaf *> leaves;
|
---|
3019 |
|
---|
3020 | // sets the pointers to the currently active view cells
|
---|
3021 | CollectLeaves(node, leaves);
|
---|
3022 | vector<BvhLeaf *>::const_iterator lit, lit_end = leaves.end();
|
---|
3023 |
|
---|
3024 | for (lit = leaves.begin(); lit != lit_end; ++ lit)
|
---|
3025 | {
|
---|
3026 | (*lit)->SetActiveNode(node);
|
---|
3027 | }
|
---|
3028 | }
|
---|
3029 |
|
---|
3030 |
|
---|
3031 | void BvHierarchy::CollectObjects(const AxisAlignedBox3 &box,
|
---|
3032 | ObjectContainer &objects)
|
---|
3033 | {
|
---|
3034 | stack<BvhNode *> nodeStack;
|
---|
3035 |
|
---|
3036 | nodeStack.push(mRoot);
|
---|
3037 |
|
---|
3038 | while (!nodeStack.empty()) {
|
---|
3039 | BvhNode *node = nodeStack.top();
|
---|
3040 |
|
---|
3041 | nodeStack.pop();
|
---|
3042 | if (node->IsLeaf()) {
|
---|
3043 | BvhLeaf *leaf = (BvhLeaf *)node;
|
---|
3044 | if (Overlap(box, leaf->GetBoundingBox())) {
|
---|
3045 | Intersectable *object = leaf;
|
---|
3046 | if (!object->Mailed()) {
|
---|
3047 | object->Mail();
|
---|
3048 | objects.push_back(object);
|
---|
3049 | }
|
---|
3050 | }
|
---|
3051 | }
|
---|
3052 | else
|
---|
3053 | {
|
---|
3054 | BvhInterior *interior = (BvhInterior *)node;
|
---|
3055 | if (Overlap(box, interior->GetBoundingBox())) {
|
---|
3056 | bool pushed = false;
|
---|
3057 | if (!interior->GetFront()->Mailed()) {
|
---|
3058 | nodeStack.push(interior->GetFront());
|
---|
3059 | pushed = true;
|
---|
3060 | }
|
---|
3061 | if (!interior->GetBack()->Mailed()) {
|
---|
3062 | nodeStack.push(interior->GetBack());
|
---|
3063 | pushed = true;
|
---|
3064 | }
|
---|
3065 | // avoid traversal of this node in the next query
|
---|
3066 | if (!pushed)
|
---|
3067 | interior->Mail();
|
---|
3068 | }
|
---|
3069 | }
|
---|
3070 | }
|
---|
3071 | }
|
---|
3072 |
|
---|
3073 |
|
---|
3074 | void BvHierarchy::CreateUniqueObjectIds()
|
---|
3075 | {
|
---|
3076 | stack<BvhNode *> nodeStack;
|
---|
3077 | nodeStack.push(mRoot);
|
---|
3078 |
|
---|
3079 | int currentId = 0;
|
---|
3080 | while (!nodeStack.empty())
|
---|
3081 | {
|
---|
3082 | BvhNode *node = nodeStack.top();
|
---|
3083 | nodeStack.pop();
|
---|
3084 |
|
---|
3085 | node->SetId(currentId ++);
|
---|
3086 |
|
---|
3087 | if (!node->IsLeaf())
|
---|
3088 | {
|
---|
3089 | BvhInterior *interior = (BvhInterior *)node;
|
---|
3090 |
|
---|
3091 | nodeStack.push(interior->GetFront());
|
---|
3092 | nodeStack.push(interior->GetBack());
|
---|
3093 | }
|
---|
3094 | }
|
---|
3095 | }
|
---|
3096 |
|
---|
3097 |
|
---|
3098 | void BvHierarchy::ApplyInitialSubdivision(SubdivisionCandidate *firstCandidate,
|
---|
3099 | vector<SubdivisionCandidate *> &candidateContainer)
|
---|
3100 | {
|
---|
3101 | SplitQueue tempQueue;
|
---|
3102 | tempQueue.Push(firstCandidate);
|
---|
3103 |
|
---|
3104 | while (!tempQueue.Empty())
|
---|
3105 | {
|
---|
3106 | SubdivisionCandidate *candidate = tempQueue.Top();
|
---|
3107 | tempQueue.Pop();
|
---|
3108 |
|
---|
3109 | BvhSubdivisionCandidate *bsc =
|
---|
3110 | static_cast<BvhSubdivisionCandidate *>(candidate);
|
---|
3111 |
|
---|
3112 | if (!InitialTerminationCriteriaMet(bsc->mParentData))
|
---|
3113 | {
|
---|
3114 | const bool globalCriteriaMet = GlobalTerminationCriteriaMet(bsc->mParentData);
|
---|
3115 |
|
---|
3116 | SubdivisionCandidateContainer dirtyList;
|
---|
3117 | BvhNode *node = Subdivide(tempQueue, bsc, globalCriteriaMet, dirtyList);
|
---|
3118 |
|
---|
3119 | // not needed anymore
|
---|
3120 | delete bsc;
|
---|
3121 | }
|
---|
3122 | else
|
---|
3123 | {
|
---|
3124 | // initial preprocessing finished for this candidate
|
---|
3125 | // add to candidate container
|
---|
3126 | candidateContainer.push_back(bsc);
|
---|
3127 | }
|
---|
3128 | }
|
---|
3129 | }
|
---|
3130 |
|
---|
3131 |
|
---|
3132 | void BvHierarchy::ApplyInitialSplit(const BvhTraversalData &tData,
|
---|
3133 | ObjectContainer &frontObjects,
|
---|
3134 | ObjectContainer &backObjects)
|
---|
3135 | {
|
---|
3136 | ObjectContainer *objects = tData.mSortedObjects[3];
|
---|
3137 |
|
---|
3138 | ObjectContainer::const_iterator oit, oit_end = objects->end();
|
---|
3139 |
|
---|
3140 | float maxAreaDiff = -1.0f;
|
---|
3141 |
|
---|
3142 | ObjectContainer::const_iterator backObjectsStart = objects->begin();
|
---|
3143 |
|
---|
3144 | for (oit = objects->begin(); oit != (objects->end() - 1); ++ oit)
|
---|
3145 | {
|
---|
3146 | Intersectable *objS = *oit;
|
---|
3147 | Intersectable *objL = *(oit + 1);
|
---|
3148 |
|
---|
3149 | const float areaDiff =
|
---|
3150 | objL->GetBox().SurfaceArea() - objS->GetBox().SurfaceArea();
|
---|
3151 |
|
---|
3152 | if (areaDiff > maxAreaDiff)
|
---|
3153 | {
|
---|
3154 | maxAreaDiff = areaDiff;
|
---|
3155 | backObjectsStart = oit + 1;
|
---|
3156 | }
|
---|
3157 | }
|
---|
3158 |
|
---|
3159 | // belongs to back bv
|
---|
3160 | for (oit = objects->begin(); oit != backObjectsStart; ++ oit)
|
---|
3161 | {
|
---|
3162 | frontObjects.push_back(*oit);
|
---|
3163 | }
|
---|
3164 |
|
---|
3165 | // belongs to front bv
|
---|
3166 | for (oit = backObjectsStart; oit != oit_end; ++ oit)
|
---|
3167 | {
|
---|
3168 | backObjects.push_back(*oit);
|
---|
3169 | }
|
---|
3170 |
|
---|
3171 | cout << "front: " << (int)frontObjects.size() << " back: " << (int)backObjects.size() << " "
|
---|
3172 | << backObjects.front()->GetBox().SurfaceArea() - frontObjects.back()->GetBox().SurfaceArea() << endl;
|
---|
3173 | }
|
---|
3174 |
|
---|
3175 |
|
---|
3176 | inline static float AreaRatio(Intersectable *smallObj, Intersectable *largeObj)
|
---|
3177 | {
|
---|
3178 | const float areaSmall = smallObj->GetBox().SurfaceArea();
|
---|
3179 | const float areaLarge = largeObj->GetBox().SurfaceArea();
|
---|
3180 |
|
---|
3181 | return areaSmall / (areaLarge - areaSmall + Limits::Small);
|
---|
3182 | }
|
---|
3183 |
|
---|
3184 |
|
---|
3185 | bool BvHierarchy::InitialTerminationCriteriaMet(const BvhTraversalData &tData) const
|
---|
3186 | {
|
---|
3187 | const bool terminationCriteriaMet =
|
---|
3188 | (0
|
---|
3189 | || ((int)tData.mNode->mObjects.size() < mInitialMinObjects)
|
---|
3190 | || (tData.mNode->mObjects.back()->GetBox().SurfaceArea() < mInitialMinArea)
|
---|
3191 | || (AreaRatio(tData.mNode->mObjects.front(), tData.mNode->mObjects.back()) > mInitialMaxAreaRatio)
|
---|
3192 | );
|
---|
3193 |
|
---|
3194 | cout << "criteria met: "<< terminationCriteriaMet << "\n"
|
---|
3195 | << "size: " << (int)tData.mNode->mObjects.size() << " max: " << mInitialMinObjects << endl
|
---|
3196 | << "ratio: " << AreaRatio(tData.mNode->mObjects.front(), tData.mNode->mObjects.back()) << " max: " << mInitialMaxAreaRatio << endl
|
---|
3197 | << "area: " << tData.mNode->mObjects.back()->GetBox().SurfaceArea() << " max: " << mInitialMinArea << endl << endl;
|
---|
3198 |
|
---|
3199 | return terminationCriteriaMet;
|
---|
3200 | }
|
---|
3201 |
|
---|
3202 |
|
---|
3203 | // HACK
|
---|
3204 | float BvHierarchy::GetTriangleSizeIncrementially(BvhNode *node) const
|
---|
3205 | {
|
---|
3206 | if (node->mRenderCost < 0)
|
---|
3207 | {
|
---|
3208 | //cout <<"p";
|
---|
3209 | if (node->IsLeaf())
|
---|
3210 | {
|
---|
3211 | BvhLeaf *leaf = static_cast<BvhLeaf *>(node);
|
---|
3212 | node->mRenderCost = (float)leaf->mObjects.size();
|
---|
3213 | }
|
---|
3214 | else
|
---|
3215 | {
|
---|
3216 | BvhInterior *interior = static_cast<BvhInterior *>(node);
|
---|
3217 |
|
---|
3218 | node->mRenderCost = GetTriangleSizeIncrementially(interior->GetFront()) +
|
---|
3219 | GetTriangleSizeIncrementially(interior->GetBack());
|
---|
3220 | }
|
---|
3221 | }
|
---|
3222 |
|
---|
3223 | return node->mRenderCost;
|
---|
3224 | }
|
---|
3225 |
|
---|
3226 |
|
---|
3227 | void BvHierarchy::Compress()
|
---|
3228 | {
|
---|
3229 | }
|
---|
3230 |
|
---|
3231 |
|
---|
3232 | void BvHierarchy::SetUniqueNodeIds()
|
---|
3233 | {
|
---|
3234 | // export bounding boxes
|
---|
3235 | vector<BvhNode *> nodes;
|
---|
3236 |
|
---|
3237 | // hack: should also expect interior nodes
|
---|
3238 | CollectNodes(mRoot, nodes);
|
---|
3239 |
|
---|
3240 | vector<BvhNode *>::const_iterator oit, oit_end = nodes.end();
|
---|
3241 |
|
---|
3242 | int id = 0;
|
---|
3243 |
|
---|
3244 | for (oit = nodes.begin(); oit != oit_end; ++ oit, ++ id)
|
---|
3245 | {
|
---|
3246 | (*oit)->SetId(id);
|
---|
3247 | }
|
---|
3248 | }
|
---|
3249 |
|
---|
3250 |
|
---|
3251 | }
|
---|