1 | #include "Plane3.h"
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2 | #include "ViewCellBsp.h"
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3 | #include "Mesh.h"
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4 | #include "common.h"
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5 | #include "ViewCell.h"
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6 | #include "Environment.h"
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7 | #include "Polygon3.h"
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8 | #include "Ray.h"
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9 | #include "AxisAlignedBox3.h"
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10 | #include <stack>
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11 |
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12 | #include "Exporter.h"
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13 | #include "Plane3.h"
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14 |
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15 | //-- static members
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16 |
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17 | int BspNode::sMailId = 1;
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18 |
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19 | /** Evaluates split plane classification with respect to the plane's
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20 | contribution for a minimum number splits in the tree.
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21 | */
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22 | const float BspTree::sLeastPolySplitsTable[] = {0, 0, 1, 0};
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23 | /** Evaluates split plane classification with respect to the plane's
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24 | contribution for a balanced tree.
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25 | */
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26 | const float BspTree::sBalancedPolysTable[] = {1, -1, 0, 0};
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27 |
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28 | /** Evaluates split plane classification with respect to the plane's
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29 | contribution for a minimum number of ray splits.
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30 | */
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31 | const float BspTree::sLeastRaySplitsTable[] = {0, 0, 1, 1, 0};
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32 | /** Evaluates split plane classification with respect to the plane's
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33 | contribution for balanced rays.
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34 | */
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35 | const float BspTree::sBalancedRaysTable[] = {1, -1, 0, 0, 0};
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36 |
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37 | int BspTree::sFrontId = 0;
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38 | int BspTree::sBackId = 0;
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39 | int BspTree::sFrontAndBackId = 0;
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40 |
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41 |
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42 | /****************************************************************/
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43 | /* class BspNode implementation */
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44 | /****************************************************************/
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45 |
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46 |
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47 | BspNode::BspNode():
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48 | mParent(NULL), mTreeValid(true)
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49 | {}
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50 |
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51 | BspNode::BspNode(BspInterior *parent):
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52 | mParent(parent), mTreeValid(true)
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53 | {}
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54 |
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55 |
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56 | bool BspNode::IsRoot() const
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57 | {
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58 | return mParent == NULL;
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59 | }
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60 |
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61 |
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62 | BspInterior *BspNode::GetParent()
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63 | {
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64 | return mParent;
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65 | }
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66 |
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67 |
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68 | void BspNode::SetParent(BspInterior *parent)
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69 | {
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70 | mParent = parent;
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71 | }
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72 |
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73 |
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74 | bool BspNode::IsSibling(BspNode *n) const
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75 | {
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76 | return ((this != n) && mParent &&
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77 | (mParent->GetFront() == n) || (mParent->GetBack() == n));
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78 | }
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79 |
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80 |
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81 | int BspNode::GetDepth() const
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82 | {
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83 | int depth = 0;
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84 | BspNode *p = mParent;
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85 |
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86 | while (p)
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87 | {
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88 | p = p->mParent;
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89 | ++ depth;
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90 | }
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91 |
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92 | return depth;
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93 | }
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94 |
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95 |
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96 | bool BspNode::TreeValid() const
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97 | {
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98 | return mTreeValid;
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99 | }
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100 |
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101 |
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102 | void BspNode::SetTreeValid(const bool v)
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103 | {
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104 | mTreeValid = v;
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105 | }
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106 |
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107 |
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108 | /****************************************************************/
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109 | /* class BspInterior implementation */
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110 | /****************************************************************/
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111 |
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112 |
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113 | BspInterior::BspInterior(const Plane3 &plane):
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114 | mPlane(plane), mFront(NULL), mBack(NULL)
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115 | {}
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116 |
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117 | BspInterior::~BspInterior()
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118 | {
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119 | DEL_PTR(mFront);
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120 | DEL_PTR(mBack);
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121 | }
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122 |
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123 | bool BspInterior::IsLeaf() const
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124 | {
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125 | return false;
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126 | }
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127 |
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128 | BspNode *BspInterior::GetBack()
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129 | {
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130 | return mBack;
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131 | }
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132 |
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133 | BspNode *BspInterior::GetFront()
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134 | {
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135 | return mFront;
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136 | }
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137 |
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138 | Plane3 BspInterior::GetPlane() const
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139 | {
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140 | return mPlane;
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141 | }
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142 |
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143 | void BspInterior::ReplaceChildLink(BspNode *oldChild, BspNode *newChild)
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144 | {
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145 | if (mBack == oldChild)
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146 | mBack = newChild;
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147 | else
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148 | mFront = newChild;
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149 | }
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150 |
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151 | void BspInterior::SetupChildLinks(BspNode *b, BspNode *f)
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152 | {
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153 | mBack = b;
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154 | mFront = f;
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155 | }
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156 |
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157 | /****************************************************************/
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158 | /* class BspLeaf implementation */
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159 | /****************************************************************/
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160 |
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161 |
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162 | BspLeaf::BspLeaf(): mViewCell(NULL), mPvs(NULL)
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163 | {
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164 | }
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165 |
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166 |
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167 | BspLeaf::~BspLeaf()
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168 | {
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169 | DEL_PTR(mPvs);
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170 | }
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171 |
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172 |
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173 | BspLeaf::BspLeaf(BspViewCell *viewCell):
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174 | mViewCell(viewCell)
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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 | BspLeaf::BspLeaf(BspInterior *parent):
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180 | BspNode(parent), mViewCell(NULL), mPvs(NULL)
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181 | {}
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182 |
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183 |
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184 |
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185 | BspLeaf::BspLeaf(BspInterior *parent, BspViewCell *viewCell):
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186 | BspNode(parent), mViewCell(viewCell), mPvs(NULL)
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187 | {
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188 | }
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189 |
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190 | BspViewCell *BspLeaf::GetViewCell() const
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191 | {
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192 | return mViewCell;
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193 | }
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194 |
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195 | void BspLeaf::SetViewCell(BspViewCell *viewCell)
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196 | {
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197 | mViewCell = viewCell;
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198 | }
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199 |
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200 | bool BspLeaf::IsLeaf() const
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201 | {
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202 | return true;
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203 | }
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204 |
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205 | /****************************************************************/
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206 | /* class BspTree implementation */
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207 | /****************************************************************/
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208 |
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209 | BspTree::BspTree():
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210 | mRoot(NULL),
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211 | mPvsUseArea(true),
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212 | mGenerateViewCells(true)
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213 | {
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214 | Randomize(); // initialise random generator for heuristics
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215 |
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216 | // the view cell corresponding to unbounded space
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217 | mRootCell = new BspViewCell();
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218 |
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219 | //-- termination criteria for autopartition
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220 | environment->GetIntValue("BspTree.Termination.maxDepth", mTermMaxDepth);
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221 | environment->GetIntValue("BspTree.Termination.minPvs", mTermMinPvs);
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222 | environment->GetIntValue("BspTree.Termination.minPolygons", mTermMinPolys);
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223 | environment->GetIntValue("BspTree.Termination.minRays", mTermMinRays);
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224 | environment->GetFloatValue("BspTree.Termination.minArea", mTermMinArea);
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225 | environment->GetFloatValue("BspTree.Termination.maxRayContribution", mTermMaxRayContribution);
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226 | environment->GetFloatValue("BspTree.Termination.minAccRayLenght", mTermMinAccRayLength);
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227 |
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228 | //-- factors for bsp tree split plane heuristics
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229 | environment->GetFloatValue("BspTree.Factor.verticalSplits", mVerticalSplitsFactor);
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230 | environment->GetFloatValue("BspTree.Factor.largestPolyArea", mLargestPolyAreaFactor);
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231 | environment->GetFloatValue("BspTree.Factor.blockedRays", mBlockedRaysFactor);
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232 | environment->GetFloatValue("BspTree.Factor.leastRaySplits", mLeastRaySplitsFactor);
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233 | environment->GetFloatValue("BspTree.Factor.balancedRays", mBalancedRaysFactor);
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234 | environment->GetFloatValue("BspTree.Factor.pvs", mPvsFactor);
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235 | environment->GetFloatValue("BspTree.Factor.leastSplits" , mLeastSplitsFactor);
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236 | environment->GetFloatValue("BspTree.Factor.balancedPolys", mBalancedPolysFactor);
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237 | environment->GetFloatValue("BspTree.Factor.balancedViewCells", mBalancedViewCellsFactor);
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238 | environment->GetFloatValue("BspTree.Termination.ct_div_ci", mCtDivCi);
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239 |
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240 | //-- termination criteria for axis aligned split
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241 | environment->GetFloatValue("BspTree.Termination.AxisAligned.ct_div_ci", mAxisAlignedCtDivCi);
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242 | environment->GetFloatValue("BspTree.Termination.maxCostRatio", mMaxCostRatio);
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243 | environment->GetIntValue("BspTree.Termination.AxisAligned.minPolys",
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244 | mTermMinPolysForAxisAligned);
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245 | environment->GetIntValue("BspTree.Termination.AxisAligned.minRays",
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246 | mTermMinRaysForAxisAligned);
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247 | environment->GetIntValue("BspTree.Termination.AxisAligned.minObjects",
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248 | mTermMinObjectsForAxisAligned);
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249 | //-- partition criteria
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250 | environment->GetIntValue("BspTree.maxPolyCandidates", mMaxPolyCandidates);
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251 | environment->GetIntValue("BspTree.maxRayCandidates", mMaxRayCandidates);
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252 | environment->GetIntValue("BspTree.splitPlaneStrategy", mSplitPlaneStrategy);
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253 | environment->GetFloatValue("BspTree.AxisAligned.splitBorder", mSplitBorder);
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254 | environment->GetIntValue("BspTree.maxTests", mMaxTests);
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255 |
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256 | environment->GetFloatValue("BspTree.Construction.epsilon", mEpsilon);
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257 |
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258 | Debug << "BSP max depth: " << mTermMaxDepth << endl;
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259 | Debug << "BSP min PVS: " << mTermMinPvs << endl;
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260 | Debug << "BSP min area: " << mTermMinArea << endl;
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261 | Debug << "BSP max polys: " << mTermMinPolys << endl;
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262 | Debug << "BSP max rays: " << mTermMinRays << endl;
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263 | Debug << "BSP max polygon candidates: " << mMaxPolyCandidates << endl;
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264 | Debug << "BSP max plane candidates: " << mMaxRayCandidates << endl;
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265 |
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266 | Debug << "Split plane strategy: ";
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267 | if (mSplitPlaneStrategy & RANDOM_POLYGON)
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268 | Debug << "random polygon ";
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269 | if (mSplitPlaneStrategy & AXIS_ALIGNED)
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270 | Debug << "axis aligned ";
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271 | if (mSplitPlaneStrategy & LEAST_SPLITS)
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272 | Debug << "least splits ";
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273 | if (mSplitPlaneStrategy & BALANCED_POLYS)
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274 | Debug << "balanced polygons ";
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275 | if (mSplitPlaneStrategy & BALANCED_VIEW_CELLS)
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276 | Debug << "balanced view cells ";
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277 | if (mSplitPlaneStrategy & LARGEST_POLY_AREA)
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278 | Debug << "largest polygon area ";
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279 | if (mSplitPlaneStrategy & VERTICAL_AXIS)
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280 | Debug << "vertical axis ";
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281 | if (mSplitPlaneStrategy & BLOCKED_RAYS)
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282 | Debug << "blocked rays ";
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283 | if (mSplitPlaneStrategy & LEAST_RAY_SPLITS)
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284 | Debug << "least ray splits ";
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285 | if (mSplitPlaneStrategy & BALANCED_RAYS)
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286 | Debug << "balanced rays ";
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287 | if (mSplitPlaneStrategy & PVS)
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288 | Debug << "pvs";
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289 |
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290 | Debug << endl;
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291 | }
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292 |
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293 |
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294 | const BspTreeStatistics &BspTree::GetStatistics() const
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295 | {
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296 | return mStat;
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297 | }
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298 |
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299 |
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300 | int BspTree::SplitPolygons(const Plane3 &plane,
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301 | PolygonContainer &polys,
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302 | PolygonContainer &frontPolys,
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303 | PolygonContainer &backPolys,
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304 | PolygonContainer &coincident) const
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305 | {
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306 | int splits = 0;
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307 |
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308 | #ifdef _Debug
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309 | Debug << "splitting polygons of node " << this << " with plane " << mPlane << endl;
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310 | #endif
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311 | while (!polys.empty())
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312 | {
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313 | Polygon3 *poly = polys.back();
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314 | polys.pop_back();
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315 |
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316 | //-- classify polygon
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317 | const int cf = poly->ClassifyPlane(plane, mEpsilon);
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318 |
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319 | switch (cf)
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320 | {
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321 | case Polygon3::COINCIDENT:
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322 | coincident.push_back(poly);
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323 | break;
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324 | case Polygon3::FRONT_SIDE:
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325 | frontPolys.push_back(poly);
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326 | break;
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327 | case Polygon3::BACK_SIDE:
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328 | backPolys.push_back(poly);
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329 | break;
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330 | case Polygon3::SPLIT:
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331 | {
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332 | Polygon3 *front_piece = new Polygon3(poly->mParent);
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333 | Polygon3 *back_piece = new Polygon3(poly->mParent);
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334 |
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335 | //-- split polygon into front and back part
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336 | poly->Split(plane,
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337 | *front_piece,
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338 | *back_piece,
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339 | mEpsilon);
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340 |
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341 | ++ splits; // increase number of splits
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342 |
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343 | //-- inherit rays from parent polygon for blocked ray criterium
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344 | poly->InheritRays(*front_piece, *back_piece);
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345 |
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346 | // check if polygons still valid
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347 | if (front_piece->Valid(mEpsilon))
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348 | frontPolys.push_back(front_piece);
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349 | else
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350 | DEL_PTR(front_piece);
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351 |
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352 | if (back_piece->Valid(mEpsilon))
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353 | backPolys.push_back(back_piece);
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354 | else
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355 | DEL_PTR(back_piece);
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356 |
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357 | #ifdef _DEBUG
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358 | Debug << "split " << *poly << endl << *front_piece << endl << *back_piece << endl;
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359 | #endif
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360 | DEL_PTR(poly);
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361 | }
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362 | break;
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363 | default:
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364 | Debug << "SHOULD NEVER COME HERE\n";
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365 | break;
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366 | }
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367 | }
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368 |
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369 | return splits;
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370 | }
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371 |
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372 |
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373 | void BspTreeStatistics::Print(ostream &app) const
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374 | {
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375 | app << "===== BspTree statistics ===============\n";
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376 |
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377 | app << setprecision(4);
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378 |
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379 | app << "#N_CTIME ( Construction time [s] )\n" << Time() << " \n";
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380 |
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381 | app << "#N_NODES ( Number of nodes )\n" << nodes << "\n";
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382 |
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383 | app << "#N_INTERIORS ( Number of interior nodes )\n" << Interior() << "\n";
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384 |
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385 | app << "#N_LEAVES ( Number of leaves )\n" << Leaves() << "\n";
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386 |
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387 | app << "#N_POLYSPLITS ( Number of polygon splits )\n" << polySplits << "\n";
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388 |
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389 | app << "#AXIS_ALIGNED_SPLITS (number of axis aligned splits)\n" << splits[0] + splits[1] + splits[2] << endl;
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390 |
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391 | app << "#N_SPLITS ( Number of splits in axes x y z\n";
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392 |
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393 | for (int i = 0; i < 3; ++ i)
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394 | app << splits[i] << " ";
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395 | app << endl;
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396 |
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397 | app << "#N_PMAXDEPTHLEAVES ( Percentage of leaves at maximum depth )\n"
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398 | << maxDepthNodes * 100 / (double)Leaves() << endl;
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399 |
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400 | app << "#N_PMINPVSLEAVES ( Percentage of leaves with mininimal PVS )\n"
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401 | << minPvsNodes * 100 / (double)Leaves() << endl;
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402 |
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403 | app << "#N_PMINRAYSLEAVES ( Percentage of leaves with minimal number of rays)\n"
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404 | << minRaysNodes * 100 / (double)Leaves() << endl;
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405 |
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406 | app << "#N_MAXCOSTNODES ( Percentage of leaves with terminated because of max cost ratio )\n"
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407 | << maxCostNodes * 100 / (double)Leaves() << endl;
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408 |
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409 | app << "#N_PMINAREALEAVES ( Percentage of leaves with mininum area )\n"
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410 | << minAreaNodes * 100 / (double)Leaves() << endl;
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411 |
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412 | app << "#N_PMAXRAYCONTRIBLEAVES ( Percentage of leaves with maximal ray contribution )\n"
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413 | << maxRayContribNodes * 100 / (double)Leaves() << endl;
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414 |
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415 | app << "#N_PMAXDEPTH ( Maximal reached depth )\n" << maxDepth << endl;
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416 |
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417 | app << "#N_PMINDEPTH ( Minimal reached depth )\n" << minDepth << endl;
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418 |
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419 | app << "#AVGDEPTH ( average depth )\n" << AvgDepth() << endl;
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420 |
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421 | app << "#N_INPUTPOLYGONS (number of input polygons )\n" << polys << endl;
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422 |
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423 | app << "#N_INVALIDLEAVES (number of invalid leaves )\n" << invalidLeaves << endl;
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424 |
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425 | //app << "#N_PVS: " << pvs << endl;
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426 |
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427 | app << "#N_ROUTPUT_INPUT_POLYGONS ( ratio polygons after subdivision / input polygons )\n" <<
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428 | (polys + polySplits) / (double)polys << endl;
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429 |
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430 | app << "===== END OF BspTree statistics ==========\n";
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431 | }
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432 |
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433 |
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434 | BspTree::~BspTree()
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435 | {
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436 | DEL_PTR(mRoot);
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437 |
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438 | // HACK: view cells not generated => root cell not used
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439 | if (mGenerateViewCells)
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440 | DEL_PTR(mRootCell);
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441 | }
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442 |
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443 | BspViewCell *BspTree::GetRootCell() const
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444 | {
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445 | return mRootCell;
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446 | }
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447 |
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448 | void BspTree::InsertViewCell(ViewCell *viewCell)
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449 | {
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450 | PolygonContainer *polys = new PolygonContainer();
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451 |
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452 | // don't generate new view cell, insert this one
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453 | mGenerateViewCells = false;
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454 | // extract polygons that guide the split process
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455 | mStat.polys += AddMeshToPolygons(viewCell->GetMesh(), *polys, viewCell);
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456 | mBox.Include(viewCell->GetBox()); // add to BSP aabb
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457 |
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458 | InsertPolygons(polys);
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459 | }
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460 |
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461 | void BspTree::InsertPolygons(PolygonContainer *polys)
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462 | {
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463 | BspTraversalStack tStack;
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464 |
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465 | // traverse existing tree or create new tree
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466 | if (!mRoot)
|
---|
467 | mRoot = new BspLeaf();
|
---|
468 |
|
---|
469 | tStack.push(BspTraversalData(mRoot,
|
---|
470 | polys,
|
---|
471 | 0,
|
---|
472 | mRootCell,
|
---|
473 | new BoundedRayContainer(),
|
---|
474 | 0,
|
---|
475 | mBox.SurfaceArea(),
|
---|
476 | new BspNodeGeometry()));
|
---|
477 |
|
---|
478 | while (!tStack.empty())
|
---|
479 | {
|
---|
480 | // filter polygons donw the tree
|
---|
481 | BspTraversalData tData = tStack.top();
|
---|
482 | tStack.pop();
|
---|
483 |
|
---|
484 | if (!tData.mNode->IsLeaf())
|
---|
485 | {
|
---|
486 | BspInterior *interior = dynamic_cast<BspInterior *>(tData.mNode);
|
---|
487 |
|
---|
488 | //-- filter view cell polygons down the tree until a leaf is reached
|
---|
489 | if (!tData.mPolygons->empty())
|
---|
490 | {
|
---|
491 | PolygonContainer *frontPolys = new PolygonContainer();
|
---|
492 | PolygonContainer *backPolys = new PolygonContainer();
|
---|
493 | PolygonContainer coincident;
|
---|
494 |
|
---|
495 | int splits = 0;
|
---|
496 |
|
---|
497 | // split viewcell polygons with respect to split plane
|
---|
498 | splits += SplitPolygons(interior->GetPlane(),
|
---|
499 | *tData.mPolygons,
|
---|
500 | *frontPolys,
|
---|
501 | *backPolys,
|
---|
502 | coincident);
|
---|
503 |
|
---|
504 | // extract view cells associated with the split polygons
|
---|
505 | ViewCell *frontViewCell = mRootCell;
|
---|
506 | ViewCell *backViewCell = mRootCell;
|
---|
507 |
|
---|
508 | BspTraversalData frontData(interior->GetFront(),
|
---|
509 | frontPolys,
|
---|
510 | tData.mDepth + 1,
|
---|
511 | mRootCell,
|
---|
512 | tData.mRays,
|
---|
513 | tData.mPvs,
|
---|
514 | mBox.SurfaceArea(),
|
---|
515 | new BspNodeGeometry());
|
---|
516 |
|
---|
517 | BspTraversalData backData(interior->GetBack(),
|
---|
518 | backPolys,
|
---|
519 | tData.mDepth + 1,
|
---|
520 | mRootCell,
|
---|
521 | tData.mRays,
|
---|
522 | tData.mPvs,
|
---|
523 | mBox.SurfaceArea(),
|
---|
524 | new BspNodeGeometry());
|
---|
525 |
|
---|
526 | if (!mGenerateViewCells)
|
---|
527 | {
|
---|
528 | ExtractViewCells(frontData,
|
---|
529 | backData,
|
---|
530 | coincident,
|
---|
531 | interior->mPlane);
|
---|
532 | }
|
---|
533 |
|
---|
534 | // don't need coincident polygons anymore
|
---|
535 | CLEAR_CONTAINER(coincident);
|
---|
536 |
|
---|
537 | mStat.polySplits += splits;
|
---|
538 |
|
---|
539 | // push the children on the stack
|
---|
540 | tStack.push(frontData);
|
---|
541 | tStack.push(backData);
|
---|
542 | }
|
---|
543 |
|
---|
544 | // cleanup
|
---|
545 | DEL_PTR(tData.mPolygons);
|
---|
546 | DEL_PTR(tData.mRays);
|
---|
547 | }
|
---|
548 | else
|
---|
549 | {
|
---|
550 | // reached leaf => subdivide current viewcell
|
---|
551 | BspNode *subRoot = Subdivide(tStack, tData);
|
---|
552 | }
|
---|
553 | }
|
---|
554 | }
|
---|
555 |
|
---|
556 | int BspTree::AddMeshToPolygons(Mesh *mesh,
|
---|
557 | PolygonContainer &polys,
|
---|
558 | MeshInstance *parent)
|
---|
559 | {
|
---|
560 | FaceContainer::const_iterator fi;
|
---|
561 |
|
---|
562 | // copy the face data to polygons
|
---|
563 | for (fi = mesh->mFaces.begin(); fi != mesh->mFaces.end(); ++ fi)
|
---|
564 | {
|
---|
565 | Polygon3 *poly = new Polygon3((*fi), mesh);
|
---|
566 |
|
---|
567 | if (poly->Valid(mEpsilon))
|
---|
568 | {
|
---|
569 | poly->mParent = parent; // set parent intersectable
|
---|
570 | polys.push_back(poly);
|
---|
571 | }
|
---|
572 | else
|
---|
573 | DEL_PTR(poly);
|
---|
574 | }
|
---|
575 | return (int)mesh->mFaces.size();
|
---|
576 | }
|
---|
577 |
|
---|
578 | int BspTree::AddToPolygonSoup(const ViewCellContainer &viewCells,
|
---|
579 | PolygonContainer &polys,
|
---|
580 | int maxObjects)
|
---|
581 | {
|
---|
582 | int limit = (maxObjects > 0) ?
|
---|
583 | Min((int)viewCells.size(), maxObjects) : (int)viewCells.size();
|
---|
584 |
|
---|
585 | int polysSize = 0;
|
---|
586 |
|
---|
587 | for (int i = 0; i < limit; ++ i)
|
---|
588 | {
|
---|
589 | if (viewCells[i]->GetMesh()) // copy the mesh data to polygons
|
---|
590 | {
|
---|
591 | mBox.Include(viewCells[i]->GetBox()); // add to BSP tree aabb
|
---|
592 | polysSize += AddMeshToPolygons(viewCells[i]->GetMesh(), polys, viewCells[i]);
|
---|
593 | }
|
---|
594 | }
|
---|
595 |
|
---|
596 | return polysSize;
|
---|
597 | }
|
---|
598 |
|
---|
599 | int BspTree::AddToPolygonSoup(const ObjectContainer &objects, PolygonContainer &polys, int maxObjects)
|
---|
600 | {
|
---|
601 | int limit = (maxObjects > 0) ? Min((int)objects.size(), maxObjects) : (int)objects.size();
|
---|
602 |
|
---|
603 | for (int i = 0; i < limit; ++i)
|
---|
604 | {
|
---|
605 | Intersectable *object = objects[i];//*it;
|
---|
606 | Mesh *mesh = NULL;
|
---|
607 |
|
---|
608 | switch (object->Type()) // extract the meshes
|
---|
609 | {
|
---|
610 | case Intersectable::MESH_INSTANCE:
|
---|
611 | mesh = dynamic_cast<MeshInstance *>(object)->GetMesh();
|
---|
612 | break;
|
---|
613 | case Intersectable::VIEW_CELL:
|
---|
614 | mesh = dynamic_cast<ViewCell *>(object)->GetMesh();
|
---|
615 | break;
|
---|
616 | // TODO: handle transformed mesh instances
|
---|
617 | default:
|
---|
618 | Debug << "intersectable type not supported" << endl;
|
---|
619 | break;
|
---|
620 | }
|
---|
621 |
|
---|
622 | if (mesh) // copy the mesh data to polygons
|
---|
623 | {
|
---|
624 | mBox.Include(object->GetBox()); // add to BSP tree aabb
|
---|
625 | AddMeshToPolygons(mesh, polys, mRootCell);
|
---|
626 | }
|
---|
627 | }
|
---|
628 |
|
---|
629 | return (int)polys.size();
|
---|
630 | }
|
---|
631 |
|
---|
632 | void BspTree::Construct(const ViewCellContainer &viewCells)
|
---|
633 | {
|
---|
634 | mStat.nodes = 1;
|
---|
635 | mBox.Initialize(); // initialise bsp tree bounding box
|
---|
636 |
|
---|
637 | // copy view cell meshes into one big polygon soup
|
---|
638 | PolygonContainer *polys = new PolygonContainer();
|
---|
639 | mStat.polys = AddToPolygonSoup(viewCells, *polys);
|
---|
640 |
|
---|
641 | // view cells are given
|
---|
642 | mGenerateViewCells = false;
|
---|
643 | // construct tree from the view cell polygons
|
---|
644 | Construct(polys, new BoundedRayContainer());
|
---|
645 | }
|
---|
646 |
|
---|
647 |
|
---|
648 | void BspTree::Construct(const ObjectContainer &objects)
|
---|
649 | {
|
---|
650 | mStat.nodes = 1;
|
---|
651 | mBox.Initialize(); // initialise bsp tree bounding box
|
---|
652 |
|
---|
653 | PolygonContainer *polys = new PolygonContainer();
|
---|
654 |
|
---|
655 | mGenerateViewCells = true;
|
---|
656 | // copy mesh instance polygons into one big polygon soup
|
---|
657 | mStat.polys = AddToPolygonSoup(objects, *polys);
|
---|
658 |
|
---|
659 | // construct tree from polygon soup
|
---|
660 | Construct(polys, new BoundedRayContainer());
|
---|
661 | }
|
---|
662 |
|
---|
663 | void BspTree::Construct(const RayContainer &sampleRays)
|
---|
664 | {
|
---|
665 | mStat.nodes = 1;
|
---|
666 | mBox.Initialize(); // initialise BSP tree bounding box
|
---|
667 |
|
---|
668 | PolygonContainer *polys = new PolygonContainer();
|
---|
669 | BoundedRayContainer *rays = new BoundedRayContainer();
|
---|
670 |
|
---|
671 | RayContainer::const_iterator rit, rit_end = sampleRays.end();
|
---|
672 |
|
---|
673 | // generate view cells
|
---|
674 | mGenerateViewCells = true;
|
---|
675 |
|
---|
676 | long startTime = GetTime();
|
---|
677 |
|
---|
678 | Debug << "**** Extracting polygons from rays ****\n";
|
---|
679 |
|
---|
680 | std::map<Face *, Polygon3 *> facePolyMap;
|
---|
681 |
|
---|
682 | //-- extract polygons intersected by the rays
|
---|
683 | for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
|
---|
684 | {
|
---|
685 | Ray *ray = *rit;
|
---|
686 |
|
---|
687 | // get ray-face intersection. Store polygon representing the rays together
|
---|
688 | // with rays intersecting the face.
|
---|
689 | if (!ray->intersections.empty())
|
---|
690 | {
|
---|
691 | MeshInstance *obj = dynamic_cast<MeshInstance *>(ray->intersections[0].mObject);
|
---|
692 | Face *face = obj->GetMesh()->mFaces[ray->intersections[0].mFace];
|
---|
693 |
|
---|
694 | std::map<Face *, Polygon3 *>::iterator it = facePolyMap.find(face);
|
---|
695 |
|
---|
696 | if (it != facePolyMap.end())
|
---|
697 | {
|
---|
698 | //store rays if needed for heuristics
|
---|
699 | if (mSplitPlaneStrategy & BLOCKED_RAYS)
|
---|
700 | (*it).second->mPiercingRays.push_back(ray);
|
---|
701 | }
|
---|
702 | else
|
---|
703 | { //store rays if needed for heuristics
|
---|
704 | Polygon3 *poly = new Polygon3(face, obj->GetMesh());
|
---|
705 | poly->mParent = obj;
|
---|
706 | polys->push_back(poly);
|
---|
707 |
|
---|
708 | if (mSplitPlaneStrategy & BLOCKED_RAYS)
|
---|
709 | poly->mPiercingRays.push_back(ray);
|
---|
710 |
|
---|
711 | facePolyMap[face] = poly;
|
---|
712 | }
|
---|
713 | }
|
---|
714 | }
|
---|
715 |
|
---|
716 | facePolyMap.clear();
|
---|
717 |
|
---|
718 | // compute bounding box
|
---|
719 | Polygon3::IncludeInBox(*polys, mBox);
|
---|
720 |
|
---|
721 | //-- store rays
|
---|
722 | for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
|
---|
723 | {
|
---|
724 | Ray *ray = *rit;
|
---|
725 | ray->SetId(-1); // reset id
|
---|
726 |
|
---|
727 | float minT, maxT;
|
---|
728 | if (mBox.GetRaySegment(*ray, minT, maxT))
|
---|
729 | rays->push_back(new BoundedRay(ray, minT, maxT));
|
---|
730 | }
|
---|
731 |
|
---|
732 | mStat.polys = (int)polys->size();
|
---|
733 |
|
---|
734 | Debug << "**** Finished polygon extraction ****" << endl;
|
---|
735 | Debug << (int)polys->size() << " polys extracted from " << (int)sampleRays.size() << " rays" << endl;
|
---|
736 | Debug << "extraction time: " << TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
|
---|
737 |
|
---|
738 | Construct(polys, rays);
|
---|
739 | }
|
---|
740 |
|
---|
741 | void BspTree::Construct(const ObjectContainer &objects, const RayContainer &sampleRays)
|
---|
742 | {
|
---|
743 | mStat.nodes = 1;
|
---|
744 | mBox.Initialize(); // initialise BSP tree bounding box
|
---|
745 |
|
---|
746 | BoundedRayContainer *rays = new BoundedRayContainer();
|
---|
747 | PolygonContainer *polys = new PolygonContainer();
|
---|
748 |
|
---|
749 | mGenerateViewCells = true;
|
---|
750 |
|
---|
751 | // copy mesh instance polygons into one big polygon soup
|
---|
752 | mStat.polys = AddToPolygonSoup(objects, *polys);
|
---|
753 |
|
---|
754 | RayContainer::const_iterator rit, rit_end = sampleRays.end();
|
---|
755 |
|
---|
756 | //-- store rays
|
---|
757 | for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
|
---|
758 | {
|
---|
759 | Ray *ray = *rit;
|
---|
760 | ray->SetId(-1); // reset id
|
---|
761 |
|
---|
762 | float minT, maxT;
|
---|
763 | if (mBox.GetRaySegment(*ray, minT, maxT))
|
---|
764 | rays->push_back(new BoundedRay(ray, minT, maxT));
|
---|
765 | }
|
---|
766 |
|
---|
767 | Debug << "tree has " << (int)polys->size() << " polys, " << (int)sampleRays.size() << " rays" << endl;
|
---|
768 | Construct(polys, rays);
|
---|
769 | }
|
---|
770 |
|
---|
771 | void BspTree::Construct(PolygonContainer *polys, BoundedRayContainer *rays)
|
---|
772 | {
|
---|
773 | BspTraversalStack tStack;
|
---|
774 |
|
---|
775 | mRoot = new BspLeaf();
|
---|
776 |
|
---|
777 | // constrruct root node geometry
|
---|
778 | BspNodeGeometry *cell = new BspNodeGeometry();
|
---|
779 | ConstructGeometry(mRoot, *cell);
|
---|
780 |
|
---|
781 | BspTraversalData tData(mRoot, polys, 0, mRootCell, rays,
|
---|
782 | ComputePvsSize(*rays), cell->GetArea(), cell);
|
---|
783 |
|
---|
784 | tStack.push(tData);
|
---|
785 |
|
---|
786 | mStat.Start();
|
---|
787 | cout << "Contructing bsp tree ... ";
|
---|
788 | long startTime = GetTime();
|
---|
789 | while (!tStack.empty())
|
---|
790 | {
|
---|
791 | tData = tStack.top();
|
---|
792 |
|
---|
793 | tStack.pop();
|
---|
794 |
|
---|
795 | // subdivide leaf node
|
---|
796 | BspNode *r = Subdivide(tStack, tData);
|
---|
797 |
|
---|
798 | if (r == mRoot)
|
---|
799 | Debug << "BSP tree construction time spent at root: " << TimeDiff(startTime, GetTime())*1e-3 << " secs" << endl;
|
---|
800 | }
|
---|
801 |
|
---|
802 | cout << "finished\n";
|
---|
803 |
|
---|
804 | mStat.Stop();
|
---|
805 | }
|
---|
806 |
|
---|
807 | bool BspTree::TerminationCriteriaMet(const BspTraversalData &data) const
|
---|
808 | {
|
---|
809 | return
|
---|
810 | (((int)data.mPolygons->size() <= mTermMinPolys) ||
|
---|
811 | ((int)data.mRays->size() <= mTermMinRays) ||
|
---|
812 | (data.mPvs <= mTermMinPvs) ||
|
---|
813 | (data.mArea <= mTermMinArea) ||
|
---|
814 | (data.mDepth >= mTermMaxDepth) ||
|
---|
815 | (data.GetAvgRayContribution() < mTermMaxRayContribution));
|
---|
816 | }
|
---|
817 |
|
---|
818 | BspNode *BspTree::Subdivide(BspTraversalStack &tStack, BspTraversalData &tData)
|
---|
819 | {
|
---|
820 | //-- terminate traversal
|
---|
821 | if (TerminationCriteriaMet(tData))
|
---|
822 | {
|
---|
823 | BspLeaf *leaf = dynamic_cast<BspLeaf *>(tData.mNode);
|
---|
824 |
|
---|
825 | BspViewCell *viewCell;
|
---|
826 |
|
---|
827 | // generate new view cell for each leaf
|
---|
828 | if (mGenerateViewCells)
|
---|
829 | viewCell = new BspViewCell();
|
---|
830 | else
|
---|
831 | // add view cell to leaf
|
---|
832 | viewCell = dynamic_cast<BspViewCell *>(tData.mViewCell);
|
---|
833 |
|
---|
834 | leaf->SetViewCell(viewCell);
|
---|
835 | viewCell->mLeaves.push_back(leaf);
|
---|
836 |
|
---|
837 | //-- add pvs
|
---|
838 | if (viewCell != mRootCell)
|
---|
839 | {
|
---|
840 | int conSamp = 0, sampCon = 0;
|
---|
841 | AddToPvs(leaf, *tData.mRays, conSamp, sampCon);
|
---|
842 |
|
---|
843 | mStat.contributingSamples += conSamp;
|
---|
844 | mStat.sampleContributions += sampCon;
|
---|
845 | }
|
---|
846 |
|
---|
847 | EvaluateLeafStats(tData);
|
---|
848 |
|
---|
849 | //-- clean up
|
---|
850 |
|
---|
851 | // discard polygons
|
---|
852 | CLEAR_CONTAINER(*tData.mPolygons);
|
---|
853 | // discard rays
|
---|
854 | CLEAR_CONTAINER(*tData.mRays);
|
---|
855 |
|
---|
856 | DEL_PTR(tData.mPolygons);
|
---|
857 | DEL_PTR(tData.mRays);
|
---|
858 | DEL_PTR(tData.mGeometry);
|
---|
859 |
|
---|
860 | return leaf;
|
---|
861 | }
|
---|
862 |
|
---|
863 | //-- continue subdivision
|
---|
864 | PolygonContainer coincident;
|
---|
865 |
|
---|
866 | BspTraversalData tFrontData(NULL, new PolygonContainer(), tData.mDepth + 1, mRootCell,
|
---|
867 | new BoundedRayContainer(), 0, 0, new BspNodeGeometry());
|
---|
868 | BspTraversalData tBackData(NULL, new PolygonContainer(), tData.mDepth + 1, mRootCell,
|
---|
869 | new BoundedRayContainer(), 0, 0, new BspNodeGeometry());
|
---|
870 |
|
---|
871 | // create new interior node and two leaf nodes
|
---|
872 | BspInterior *interior =
|
---|
873 | SubdivideNode(tData, tFrontData, tBackData, coincident);
|
---|
874 |
|
---|
875 | #ifdef _DEBUG
|
---|
876 | // if (frontPolys->empty() && backPolys->empty() && (coincident.size() > 2))
|
---|
877 | // { for (PolygonContainer::iterator it = coincident.begin(); it != coincident.end(); ++it)
|
---|
878 | // Debug << (*it) << " " << (*it)->GetArea() << " " << (*it)->mParent << endl ;
|
---|
879 | // Debug << endl;}
|
---|
880 | #endif
|
---|
881 |
|
---|
882 | // extract view cells from coincident polygons according to plane normal
|
---|
883 | // only if front or back polygons are empty
|
---|
884 | if (!mGenerateViewCells)
|
---|
885 | {
|
---|
886 | ExtractViewCells(tFrontData,
|
---|
887 | tBackData,
|
---|
888 | coincident,
|
---|
889 | interior->mPlane);
|
---|
890 | }
|
---|
891 |
|
---|
892 | // don't need coincident polygons anymory
|
---|
893 | CLEAR_CONTAINER(coincident);
|
---|
894 |
|
---|
895 | // push the children on the stack
|
---|
896 | tStack.push(tFrontData);
|
---|
897 | tStack.push(tBackData);
|
---|
898 |
|
---|
899 | // cleanup
|
---|
900 | DEL_PTR(tData.mNode);
|
---|
901 |
|
---|
902 | DEL_PTR(tData.mPolygons);
|
---|
903 | DEL_PTR(tData.mRays);
|
---|
904 | DEL_PTR(tData.mGeometry);
|
---|
905 |
|
---|
906 | return interior;
|
---|
907 | }
|
---|
908 |
|
---|
909 | void BspTree::ExtractViewCells(BspTraversalData &frontData,
|
---|
910 | BspTraversalData &backData,
|
---|
911 | const PolygonContainer &coincident,
|
---|
912 | const Plane3 &splitPlane) const
|
---|
913 | {
|
---|
914 | // if not empty, tree is further subdivided => don't have to find view cell
|
---|
915 | bool foundFront = !frontData.mPolygons->empty();
|
---|
916 | bool foundBack = !frontData.mPolygons->empty();
|
---|
917 |
|
---|
918 | PolygonContainer::const_iterator it =
|
---|
919 | coincident.begin(), it_end = coincident.end();
|
---|
920 |
|
---|
921 | //-- find first view cells in front and back leafs
|
---|
922 | for (; !(foundFront && foundBack) && (it != it_end); ++ it)
|
---|
923 | {
|
---|
924 | if (DotProd((*it)->GetNormal(), splitPlane.mNormal) > 0)
|
---|
925 | {
|
---|
926 | backData.mViewCell = dynamic_cast<ViewCell *>((*it)->mParent);
|
---|
927 | foundBack = true;
|
---|
928 | }
|
---|
929 | else
|
---|
930 | {
|
---|
931 | frontData.mViewCell = dynamic_cast<ViewCell *>((*it)->mParent);
|
---|
932 | foundFront = true;
|
---|
933 | }
|
---|
934 | }
|
---|
935 | }
|
---|
936 |
|
---|
937 | BspInterior *BspTree::SubdivideNode(BspTraversalData &tData,
|
---|
938 | BspTraversalData &frontData,
|
---|
939 | BspTraversalData &backData,
|
---|
940 | PolygonContainer &coincident)
|
---|
941 | {
|
---|
942 | mStat.nodes += 2;
|
---|
943 |
|
---|
944 | BspLeaf *leaf = dynamic_cast<BspLeaf *>(tData.mNode);
|
---|
945 |
|
---|
946 | Debug << "*********************" << endl;
|
---|
947 | long startTime = GetTime();
|
---|
948 |
|
---|
949 | // select subdivision plane
|
---|
950 | BspInterior *interior =
|
---|
951 | new BspInterior(SelectPlane(leaf, tData));
|
---|
952 | Debug << "time used for split plane selection: " << TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
|
---|
953 | #ifdef _DEBUG
|
---|
954 | Debug << interior << endl;
|
---|
955 | #endif
|
---|
956 |
|
---|
957 |
|
---|
958 | Debug << "number of rays: " << (int)tData.mRays->size() << endl;
|
---|
959 | Debug << "number of polys: " << (int)tData.mPolygons->size() << endl;
|
---|
960 |
|
---|
961 | startTime = GetTime();
|
---|
962 |
|
---|
963 | // subdivide rays into front and back rays
|
---|
964 | SplitRays(interior->mPlane, *tData.mRays, *frontData.mRays, *backData.mRays);
|
---|
965 |
|
---|
966 | Debug << "time used for rays splitting: " << TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
|
---|
967 |
|
---|
968 | startTime = GetTime();
|
---|
969 | // subdivide polygons with plane
|
---|
970 | mStat.polySplits += SplitPolygons(interior->GetPlane(),
|
---|
971 | *tData.mPolygons,
|
---|
972 | *frontData.mPolygons,
|
---|
973 | *backData.mPolygons,
|
---|
974 | coincident);
|
---|
975 |
|
---|
976 | Debug << "time used for polygon splitting: " << TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
|
---|
977 |
|
---|
978 | // compute pvs
|
---|
979 | frontData.mPvs = ComputePvsSize(*frontData.mRays);
|
---|
980 | backData.mPvs = ComputePvsSize(*backData.mRays);
|
---|
981 |
|
---|
982 | // split geometry and compute area
|
---|
983 | if (1)
|
---|
984 | {
|
---|
985 | tData.mGeometry->SplitGeometry(*frontData.mGeometry,
|
---|
986 | *backData.mGeometry,
|
---|
987 | interior->mPlane,
|
---|
988 | mBox,
|
---|
989 | mEpsilon);
|
---|
990 |
|
---|
991 |
|
---|
992 | frontData.mArea = frontData.mGeometry->GetArea();
|
---|
993 | backData.mArea = backData.mGeometry->GetArea();
|
---|
994 | }
|
---|
995 |
|
---|
996 | // compute accumulated ray length
|
---|
997 | //frontData.mAccRayLength = AccumulatedRayLength(*frontData.mRays);
|
---|
998 | //backData.mAccRayLength = AccumulatedRayLength(*backData.mRays);
|
---|
999 |
|
---|
1000 | //-- create front and back leaf
|
---|
1001 |
|
---|
1002 | BspInterior *parent = leaf->GetParent();
|
---|
1003 |
|
---|
1004 | // replace a link from node's parent
|
---|
1005 | if (!leaf->IsRoot())
|
---|
1006 | {
|
---|
1007 | parent->ReplaceChildLink(leaf, interior);
|
---|
1008 | interior->SetParent(parent);
|
---|
1009 | }
|
---|
1010 | else // new root
|
---|
1011 | {
|
---|
1012 | mRoot = interior;
|
---|
1013 | }
|
---|
1014 |
|
---|
1015 | // and setup child links
|
---|
1016 | interior->SetupChildLinks(new BspLeaf(interior), new BspLeaf(interior));
|
---|
1017 |
|
---|
1018 | frontData.mNode = interior->GetFront();
|
---|
1019 | backData.mNode = interior->GetBack();
|
---|
1020 |
|
---|
1021 | //DEL_PTR(leaf);
|
---|
1022 | return interior;
|
---|
1023 | }
|
---|
1024 |
|
---|
1025 | void BspTree::SortSplitCandidates(const PolygonContainer &polys,
|
---|
1026 | const int axis,
|
---|
1027 | vector<SortableEntry> &splitCandidates) const
|
---|
1028 | {
|
---|
1029 | splitCandidates.clear();
|
---|
1030 |
|
---|
1031 | int requestedSize = 2 * (int)polys.size();
|
---|
1032 | // creates a sorted split candidates array
|
---|
1033 | splitCandidates.reserve(requestedSize);
|
---|
1034 |
|
---|
1035 | PolygonContainer::const_iterator it, it_end = polys.end();
|
---|
1036 |
|
---|
1037 | AxisAlignedBox3 box;
|
---|
1038 |
|
---|
1039 | // insert all queries
|
---|
1040 | for(it = polys.begin(); it != it_end; ++ it)
|
---|
1041 | {
|
---|
1042 | box.Initialize();
|
---|
1043 | box.Include(*(*it));
|
---|
1044 |
|
---|
1045 | splitCandidates.push_back(SortableEntry(SortableEntry::POLY_MIN, box.Min(axis), *it));
|
---|
1046 | splitCandidates.push_back(SortableEntry(SortableEntry::POLY_MAX, box.Max(axis), *it));
|
---|
1047 | }
|
---|
1048 |
|
---|
1049 | stable_sort(splitCandidates.begin(), splitCandidates.end());
|
---|
1050 | }
|
---|
1051 |
|
---|
1052 |
|
---|
1053 | float BspTree::BestCostRatio(const PolygonContainer &polys,
|
---|
1054 | const AxisAlignedBox3 &box,
|
---|
1055 | const int axis,
|
---|
1056 | float &position,
|
---|
1057 | int &objectsBack,
|
---|
1058 | int &objectsFront) const
|
---|
1059 | {
|
---|
1060 | vector<SortableEntry> splitCandidates;
|
---|
1061 |
|
---|
1062 | SortSplitCandidates(polys, axis, splitCandidates);
|
---|
1063 |
|
---|
1064 | // go through the lists, count the number of objects left and right
|
---|
1065 | // and evaluate the following cost funcion:
|
---|
1066 | // C = ct_div_ci + (ol + or)/queries
|
---|
1067 |
|
---|
1068 | int objectsLeft = 0, objectsRight = (int)polys.size();
|
---|
1069 |
|
---|
1070 | float minBox = box.Min(axis);
|
---|
1071 | float maxBox = box.Max(axis);
|
---|
1072 | float boxArea = box.SurfaceArea();
|
---|
1073 |
|
---|
1074 | float minBand = minBox + mSplitBorder * (maxBox - minBox);
|
---|
1075 | float maxBand = minBox + (1.0f - mSplitBorder) * (maxBox - minBox);
|
---|
1076 |
|
---|
1077 | float minSum = 1e20f;
|
---|
1078 | vector<SortableEntry>::const_iterator ci, ci_end = splitCandidates.end();
|
---|
1079 |
|
---|
1080 | for(ci = splitCandidates.begin(); ci != ci_end; ++ ci)
|
---|
1081 | {
|
---|
1082 | switch ((*ci).type)
|
---|
1083 | {
|
---|
1084 | case SortableEntry::POLY_MIN:
|
---|
1085 | ++ objectsLeft;
|
---|
1086 | break;
|
---|
1087 | case SortableEntry::POLY_MAX:
|
---|
1088 | -- objectsRight;
|
---|
1089 | break;
|
---|
1090 | default:
|
---|
1091 | break;
|
---|
1092 | }
|
---|
1093 |
|
---|
1094 | if ((*ci).value > minBand && (*ci).value < maxBand)
|
---|
1095 | {
|
---|
1096 | AxisAlignedBox3 lbox = box;
|
---|
1097 | AxisAlignedBox3 rbox = box;
|
---|
1098 | lbox.SetMax(axis, (*ci).value);
|
---|
1099 | rbox.SetMin(axis, (*ci).value);
|
---|
1100 |
|
---|
1101 | const float sum = objectsLeft * lbox.SurfaceArea() +
|
---|
1102 | objectsRight * rbox.SurfaceArea();
|
---|
1103 |
|
---|
1104 | if (sum < minSum)
|
---|
1105 | {
|
---|
1106 | minSum = sum;
|
---|
1107 | position = (*ci).value;
|
---|
1108 |
|
---|
1109 | objectsBack = objectsLeft;
|
---|
1110 | objectsFront = objectsRight;
|
---|
1111 | }
|
---|
1112 | }
|
---|
1113 | }
|
---|
1114 |
|
---|
1115 | const float oldCost = (float)polys.size();
|
---|
1116 | const float newCost = mAxisAlignedCtDivCi + minSum / boxArea;
|
---|
1117 | const float ratio = newCost / oldCost;
|
---|
1118 |
|
---|
1119 |
|
---|
1120 | #if 0
|
---|
1121 | Debug << "====================" << endl;
|
---|
1122 | Debug << "costRatio=" << ratio << " pos=" << position<<" t=" << (position - minBox)/(maxBox - minBox)
|
---|
1123 | << "\t o=(" << objectsBack << "," << objectsFront << ")" << endl;
|
---|
1124 | #endif
|
---|
1125 | return ratio;
|
---|
1126 | }
|
---|
1127 |
|
---|
1128 | bool BspTree::SelectAxisAlignedPlane(Plane3 &plane,
|
---|
1129 | const PolygonContainer &polys) const
|
---|
1130 | {
|
---|
1131 | AxisAlignedBox3 box;
|
---|
1132 | box.Initialize();
|
---|
1133 |
|
---|
1134 | // create bounding box of region
|
---|
1135 | Polygon3::IncludeInBox(polys, box);
|
---|
1136 |
|
---|
1137 | int objectsBack = 0, objectsFront = 0;
|
---|
1138 | int axis = 0;
|
---|
1139 | float costRatio = MAX_FLOAT;
|
---|
1140 | Vector3 position;
|
---|
1141 |
|
---|
1142 | //-- area subdivision
|
---|
1143 | for (int i = 0; i < 3; ++ i)
|
---|
1144 | {
|
---|
1145 | float p = 0;
|
---|
1146 | float r = BestCostRatio(polys, box, i, p, objectsBack, objectsFront);
|
---|
1147 |
|
---|
1148 | if (r < costRatio)
|
---|
1149 | {
|
---|
1150 | costRatio = r;
|
---|
1151 | axis = i;
|
---|
1152 | position = p;
|
---|
1153 | }
|
---|
1154 | }
|
---|
1155 |
|
---|
1156 | if (costRatio >= mMaxCostRatio)
|
---|
1157 | return false;
|
---|
1158 |
|
---|
1159 | Vector3 norm(0,0,0); norm[axis] = 1.0f;
|
---|
1160 | plane = Plane3(norm, position);
|
---|
1161 |
|
---|
1162 | return true;
|
---|
1163 | }
|
---|
1164 |
|
---|
1165 | Plane3 BspTree::SelectPlane(BspLeaf *leaf, BspTraversalData &data)
|
---|
1166 | {
|
---|
1167 | if (data.mPolygons->empty() && data.mRays->empty())
|
---|
1168 | {
|
---|
1169 | Debug << "Warning: No autopartition polygon candidate available\n";
|
---|
1170 |
|
---|
1171 | // return axis aligned split
|
---|
1172 | AxisAlignedBox3 box;
|
---|
1173 | box.Initialize();
|
---|
1174 |
|
---|
1175 | // create bounding box of region
|
---|
1176 | Polygon3::IncludeInBox(*data.mPolygons, box);
|
---|
1177 |
|
---|
1178 | const int axis = box.Size().DrivingAxis();
|
---|
1179 | const Vector3 position = (box.Min()[axis] + box.Max()[axis])*0.5f;
|
---|
1180 |
|
---|
1181 | Vector3 norm(0,0,0); norm[axis] = 1.0f;
|
---|
1182 | return Plane3(norm, position);
|
---|
1183 | }
|
---|
1184 |
|
---|
1185 | if ((mSplitPlaneStrategy & AXIS_ALIGNED) &&
|
---|
1186 | ((int)data.mPolygons->size() > mTermMinPolysForAxisAligned) &&
|
---|
1187 | ((int)data.mRays->size() > mTermMinRaysForAxisAligned) &&
|
---|
1188 | ((mTermMinObjectsForAxisAligned < 0) ||
|
---|
1189 | (Polygon3::ParentObjectsSize(*data.mPolygons) > mTermMinObjectsForAxisAligned)))
|
---|
1190 | {
|
---|
1191 | Plane3 plane;
|
---|
1192 | if (SelectAxisAlignedPlane(plane, *data.mPolygons))
|
---|
1193 | return plane;
|
---|
1194 | }
|
---|
1195 |
|
---|
1196 | // simplest strategy: just take next polygon
|
---|
1197 | if (mSplitPlaneStrategy & RANDOM_POLYGON)
|
---|
1198 | {
|
---|
1199 | if (!data.mPolygons->empty())
|
---|
1200 | {
|
---|
1201 | Polygon3 *nextPoly =
|
---|
1202 | (*data.mPolygons)[(int)RandomValue(0, (Real)((int)data.mPolygons->size() - 1))];
|
---|
1203 | return nextPoly->GetSupportingPlane();
|
---|
1204 | }
|
---|
1205 | else
|
---|
1206 | {
|
---|
1207 | const int candidateIdx = (int)RandomValue(0, (Real)((int)data.mRays->size() - 1));
|
---|
1208 | BoundedRay *bRay = (*data.mRays)[candidateIdx];
|
---|
1209 |
|
---|
1210 | Ray *ray = bRay->mRay;
|
---|
1211 |
|
---|
1212 | const Vector3 minPt = ray->Extrap(bRay->mMinT);
|
---|
1213 | const Vector3 maxPt = ray->Extrap(bRay->mMaxT);
|
---|
1214 |
|
---|
1215 | const Vector3 pt = (maxPt + minPt) * 0.5;
|
---|
1216 |
|
---|
1217 | const Vector3 normal = ray->GetDir();
|
---|
1218 |
|
---|
1219 | return Plane3(normal, pt);
|
---|
1220 | }
|
---|
1221 |
|
---|
1222 | return Plane3();
|
---|
1223 | }
|
---|
1224 |
|
---|
1225 | // use heuristics to find appropriate plane
|
---|
1226 | return SelectPlaneHeuristics(leaf, data);
|
---|
1227 | }
|
---|
1228 |
|
---|
1229 |
|
---|
1230 | Plane3 BspTree::ChooseCandidatePlane(const BoundedRayContainer &rays) const
|
---|
1231 | {
|
---|
1232 | const int candidateIdx = (int)RandomValue(0, (Real)((int)rays.size() - 1));
|
---|
1233 | BoundedRay *bRay = rays[candidateIdx];
|
---|
1234 | Ray *ray = bRay->mRay;
|
---|
1235 |
|
---|
1236 | const Vector3 minPt = ray->Extrap(bRay->mMinT);
|
---|
1237 | const Vector3 maxPt = ray->Extrap(bRay->mMaxT);
|
---|
1238 |
|
---|
1239 | const Vector3 pt = (maxPt + minPt) * 0.5;
|
---|
1240 |
|
---|
1241 | const Vector3 normal = ray->GetDir();
|
---|
1242 |
|
---|
1243 | return Plane3(normal, pt);
|
---|
1244 | }
|
---|
1245 |
|
---|
1246 | Plane3 BspTree::ChooseCandidatePlane2(const BoundedRayContainer &rays) const
|
---|
1247 | {
|
---|
1248 | Vector3 pt[3];
|
---|
1249 | int idx[3];
|
---|
1250 | int cmaxT = 0;
|
---|
1251 | int cminT = 0;
|
---|
1252 | bool chooseMin = false;
|
---|
1253 |
|
---|
1254 | for (int j = 0; j < 3; j ++)
|
---|
1255 | {
|
---|
1256 | idx[j] = (int)RandomValue(0, Real((int)rays.size() * 2 - 1));
|
---|
1257 |
|
---|
1258 | if (idx[j] >= (int)rays.size())
|
---|
1259 | {
|
---|
1260 | idx[j] -= (int)rays.size();
|
---|
1261 | chooseMin = (cminT < 2);
|
---|
1262 | }
|
---|
1263 | else
|
---|
1264 | chooseMin = (cmaxT < 2);
|
---|
1265 |
|
---|
1266 | BoundedRay *bRay = rays[idx[j]];
|
---|
1267 | pt[j] = chooseMin ? bRay->mRay->Extrap(bRay->mMinT) :
|
---|
1268 | bRay->mRay->Extrap(bRay->mMaxT);
|
---|
1269 | }
|
---|
1270 |
|
---|
1271 | return Plane3(pt[0], pt[1], pt[2]);
|
---|
1272 | }
|
---|
1273 |
|
---|
1274 | Plane3 BspTree::ChooseCandidatePlane3(const BoundedRayContainer &rays) const
|
---|
1275 | {
|
---|
1276 | Vector3 pt[3];
|
---|
1277 |
|
---|
1278 | int idx1 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
|
---|
1279 | int idx2 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
|
---|
1280 |
|
---|
1281 | // check if rays different
|
---|
1282 | if (idx1 == idx2)
|
---|
1283 | idx2 = (idx2 + 1) % (int)rays.size();
|
---|
1284 |
|
---|
1285 | const BoundedRay *ray1 = rays[idx1];
|
---|
1286 | const BoundedRay *ray2 = rays[idx2];
|
---|
1287 |
|
---|
1288 | // normal vector of the plane parallel to both lines
|
---|
1289 | const Vector3 norm =
|
---|
1290 | Normalize(CrossProd(ray1->mRay->GetDir(), ray2->mRay->GetDir()));
|
---|
1291 |
|
---|
1292 | const Vector3 orig1 = ray1->mRay->Extrap(ray1->mMinT);
|
---|
1293 | const Vector3 orig2 = ray2->mRay->Extrap(ray2->mMinT);
|
---|
1294 |
|
---|
1295 | // vector from line 1 to line 2
|
---|
1296 | const Vector3 vd = orig1 - orig2;
|
---|
1297 |
|
---|
1298 | // project vector on normal to get distance
|
---|
1299 | const float dist = DotProd(vd, norm);
|
---|
1300 |
|
---|
1301 | // point on plane lies halfway between the two planes
|
---|
1302 | const Vector3 planePt = orig1 + norm * dist * 0.5;
|
---|
1303 |
|
---|
1304 | return Plane3(norm, planePt);
|
---|
1305 | }
|
---|
1306 |
|
---|
1307 |
|
---|
1308 | Plane3 BspTree::SelectPlaneHeuristics(BspLeaf *leaf, BspTraversalData &data)
|
---|
1309 | {
|
---|
1310 | float lowestCost = MAX_FLOAT;
|
---|
1311 | Plane3 bestPlane;
|
---|
1312 | // intermediate plane
|
---|
1313 | Plane3 plane;
|
---|
1314 |
|
---|
1315 | const int limit = Min((int)data.mPolygons->size(), mMaxPolyCandidates);
|
---|
1316 | int maxIdx = (int)data.mPolygons->size();
|
---|
1317 |
|
---|
1318 | for (int i = 0; i < limit; ++ i)
|
---|
1319 | {
|
---|
1320 | // assure that no index is taken twice
|
---|
1321 | const int candidateIdx = (int)RandomValue(0, (Real)(-- maxIdx));
|
---|
1322 | //Debug << "current Idx: " << maxIdx << " cand idx " << candidateIdx << endl;
|
---|
1323 |
|
---|
1324 | Polygon3 *poly = (*data.mPolygons)[candidateIdx];
|
---|
1325 |
|
---|
1326 | // swap candidate to the end to avoid testing same plane
|
---|
1327 | std::swap((*data.mPolygons)[maxIdx], (*data.mPolygons)[candidateIdx]);
|
---|
1328 |
|
---|
1329 | //Polygon3 *poly = (*data.mPolygons)[(int)RandomValue(0, (int)polys.size() - 1)];
|
---|
1330 |
|
---|
1331 | // evaluate current candidate
|
---|
1332 | const float candidateCost =
|
---|
1333 | SplitPlaneCost(poly->GetSupportingPlane(), data);
|
---|
1334 |
|
---|
1335 | if (candidateCost < lowestCost)
|
---|
1336 | {
|
---|
1337 | bestPlane = poly->GetSupportingPlane();
|
---|
1338 | lowestCost = candidateCost;
|
---|
1339 | }
|
---|
1340 | }
|
---|
1341 |
|
---|
1342 | //-- choose candidate planes extracted from rays
|
---|
1343 | for (int i = 0; i < mMaxRayCandidates; ++ i)
|
---|
1344 | {
|
---|
1345 | plane = ChooseCandidatePlane3(*data.mRays);
|
---|
1346 | const float candidateCost = SplitPlaneCost(plane, data);
|
---|
1347 |
|
---|
1348 | if (candidateCost < lowestCost)
|
---|
1349 | {
|
---|
1350 | bestPlane = plane;
|
---|
1351 | lowestCost = candidateCost;
|
---|
1352 | }
|
---|
1353 | }
|
---|
1354 |
|
---|
1355 | #ifdef _DEBUG
|
---|
1356 | Debug << "plane lowest cost: " << lowestCost << endl;
|
---|
1357 | #endif
|
---|
1358 |
|
---|
1359 | return bestPlane;
|
---|
1360 | }
|
---|
1361 |
|
---|
1362 |
|
---|
1363 | float BspTree::SplitPlaneCost(const Plane3 &candidatePlane,
|
---|
1364 | const PolygonContainer &polys) const
|
---|
1365 | {
|
---|
1366 | float val = 0;
|
---|
1367 |
|
---|
1368 | float sumBalancedPolys = 0;
|
---|
1369 | float sumSplits = 0;
|
---|
1370 | float sumPolyArea = 0;
|
---|
1371 | float sumBalancedViewCells = 0;
|
---|
1372 | float sumBlockedRays = 0;
|
---|
1373 | float totalBlockedRays = 0;
|
---|
1374 | //float totalArea = 0;
|
---|
1375 | int totalViewCells = 0;
|
---|
1376 |
|
---|
1377 | // need three unique ids for each type of view cell
|
---|
1378 | // for balanced view cells criterium
|
---|
1379 | ViewCell::NewMail();
|
---|
1380 | const int backId = ViewCell::sMailId;
|
---|
1381 | ViewCell::NewMail();
|
---|
1382 | const int frontId = ViewCell::sMailId;
|
---|
1383 | ViewCell::NewMail();
|
---|
1384 | const int frontAndBackId = ViewCell::sMailId;
|
---|
1385 |
|
---|
1386 | bool useRand;;
|
---|
1387 | int limit;
|
---|
1388 |
|
---|
1389 | // choose test polyongs randomly if over threshold
|
---|
1390 | if ((int)polys.size() > mMaxTests)
|
---|
1391 | {
|
---|
1392 | useRand = true;
|
---|
1393 | limit = mMaxTests;
|
---|
1394 | }
|
---|
1395 | else
|
---|
1396 | {
|
---|
1397 | useRand = false;
|
---|
1398 | limit = (int)polys.size();
|
---|
1399 | }
|
---|
1400 |
|
---|
1401 | for (int i = 0; i < limit; ++ i)
|
---|
1402 | {
|
---|
1403 | const int testIdx = useRand ? (int)RandomValue(0, (Real)(limit - 1)) : i;
|
---|
1404 |
|
---|
1405 | Polygon3 *poly = polys[testIdx];
|
---|
1406 |
|
---|
1407 | const int classification =
|
---|
1408 | poly->ClassifyPlane(candidatePlane, mEpsilon);
|
---|
1409 |
|
---|
1410 | if (mSplitPlaneStrategy & BALANCED_POLYS)
|
---|
1411 | sumBalancedPolys += sBalancedPolysTable[classification];
|
---|
1412 |
|
---|
1413 | if (mSplitPlaneStrategy & LEAST_SPLITS)
|
---|
1414 | sumSplits += sLeastPolySplitsTable[classification];
|
---|
1415 |
|
---|
1416 | if (mSplitPlaneStrategy & LARGEST_POLY_AREA)
|
---|
1417 | {
|
---|
1418 | if (classification == Polygon3::COINCIDENT)
|
---|
1419 | sumPolyArea += poly->GetArea();
|
---|
1420 | //totalArea += area;
|
---|
1421 | }
|
---|
1422 |
|
---|
1423 | if (mSplitPlaneStrategy & BLOCKED_RAYS)
|
---|
1424 | {
|
---|
1425 | const float blockedRays = (float)poly->mPiercingRays.size();
|
---|
1426 |
|
---|
1427 | if (classification == Polygon3::COINCIDENT)
|
---|
1428 | sumBlockedRays += blockedRays;
|
---|
1429 |
|
---|
1430 | totalBlockedRays += blockedRays;
|
---|
1431 | }
|
---|
1432 |
|
---|
1433 | // assign view cells to back or front according to classificaion
|
---|
1434 | if (mSplitPlaneStrategy & BALANCED_VIEW_CELLS)
|
---|
1435 | {
|
---|
1436 | MeshInstance *viewCell = poly->mParent;
|
---|
1437 |
|
---|
1438 | // assure that we only count a view cell
|
---|
1439 | // once for the front and once for the back side of the plane
|
---|
1440 | if (classification == Polygon3::FRONT_SIDE)
|
---|
1441 | {
|
---|
1442 | if ((viewCell->mMailbox != frontId) &&
|
---|
1443 | (viewCell->mMailbox != frontAndBackId))
|
---|
1444 | {
|
---|
1445 | sumBalancedViewCells += 1.0;
|
---|
1446 |
|
---|
1447 | if (viewCell->mMailbox != backId)
|
---|
1448 | viewCell->mMailbox = frontId;
|
---|
1449 | else
|
---|
1450 | viewCell->mMailbox = frontAndBackId;
|
---|
1451 |
|
---|
1452 | ++ totalViewCells;
|
---|
1453 | }
|
---|
1454 | }
|
---|
1455 | else if (classification == Polygon3::BACK_SIDE)
|
---|
1456 | {
|
---|
1457 | if ((viewCell->mMailbox != backId) &&
|
---|
1458 | (viewCell->mMailbox != frontAndBackId))
|
---|
1459 | {
|
---|
1460 | sumBalancedViewCells -= 1.0;
|
---|
1461 |
|
---|
1462 | if (viewCell->mMailbox != frontId)
|
---|
1463 | viewCell->mMailbox = backId;
|
---|
1464 | else
|
---|
1465 | viewCell->mMailbox = frontAndBackId;
|
---|
1466 |
|
---|
1467 | ++ totalViewCells;
|
---|
1468 | }
|
---|
1469 | }
|
---|
1470 | }
|
---|
1471 | }
|
---|
1472 |
|
---|
1473 | const float polysSize = (float)polys.size() + Limits::Small;
|
---|
1474 |
|
---|
1475 | // all values should be approx. between 0 and 1 so they can be combined
|
---|
1476 | // and scaled with the factors according to their importance
|
---|
1477 | if (mSplitPlaneStrategy & BALANCED_POLYS)
|
---|
1478 | val += mBalancedPolysFactor * fabs(sumBalancedPolys) / polysSize;
|
---|
1479 |
|
---|
1480 | if (mSplitPlaneStrategy & LEAST_SPLITS)
|
---|
1481 | val += mLeastSplitsFactor * sumSplits / polysSize;
|
---|
1482 |
|
---|
1483 | if (mSplitPlaneStrategy & LARGEST_POLY_AREA)
|
---|
1484 | // HACK: polys.size should be total area so scaling is between 0 and 1
|
---|
1485 | val += mLargestPolyAreaFactor * (float)polys.size() / sumPolyArea;
|
---|
1486 |
|
---|
1487 | if (mSplitPlaneStrategy & BLOCKED_RAYS)
|
---|
1488 | if (totalBlockedRays != 0)
|
---|
1489 | val += mBlockedRaysFactor * (totalBlockedRays - sumBlockedRays) / totalBlockedRays;
|
---|
1490 |
|
---|
1491 | if (mSplitPlaneStrategy & BALANCED_VIEW_CELLS)
|
---|
1492 | val += mBalancedViewCellsFactor * fabs(sumBalancedViewCells) /
|
---|
1493 | ((float)totalViewCells + Limits::Small);
|
---|
1494 |
|
---|
1495 | return val;
|
---|
1496 | }
|
---|
1497 |
|
---|
1498 |
|
---|
1499 | inline void BspTree::GenerateUniqueIdsForPvs()
|
---|
1500 | {
|
---|
1501 | Intersectable::NewMail(); sBackId = ViewCell::sMailId;
|
---|
1502 | Intersectable::NewMail(); sFrontId = ViewCell::sMailId;
|
---|
1503 | Intersectable::NewMail(); sFrontAndBackId = ViewCell::sMailId;
|
---|
1504 | }
|
---|
1505 |
|
---|
1506 | float BspTree::SplitPlaneCost(const Plane3 &candidatePlane,
|
---|
1507 | const BoundedRayContainer &rays,
|
---|
1508 | const int pvs,
|
---|
1509 | const float area,
|
---|
1510 | const BspNodeGeometry &cell) const
|
---|
1511 | {
|
---|
1512 | float val = 0;
|
---|
1513 |
|
---|
1514 | float sumBalancedRays = 0;
|
---|
1515 | float sumRaySplits = 0;
|
---|
1516 |
|
---|
1517 | int frontPvs = 0;
|
---|
1518 | int backPvs = 0;
|
---|
1519 |
|
---|
1520 | // probability that view point lies in child
|
---|
1521 | float pOverall = 0;
|
---|
1522 | float pFront = 0;
|
---|
1523 | float pBack = 0;
|
---|
1524 |
|
---|
1525 | const bool pvsUseLen = false;
|
---|
1526 |
|
---|
1527 | if (mSplitPlaneStrategy & PVS)
|
---|
1528 | {
|
---|
1529 | // create unique ids for pvs heuristics
|
---|
1530 | GenerateUniqueIdsForPvs();
|
---|
1531 |
|
---|
1532 | if (mPvsUseArea) // use front and back cell areas to approximate volume
|
---|
1533 | {
|
---|
1534 | // construct child geometry with regard to the candidate split plane
|
---|
1535 | BspNodeGeometry frontCell;
|
---|
1536 | BspNodeGeometry backCell;
|
---|
1537 |
|
---|
1538 | cell.SplitGeometry(frontCell,
|
---|
1539 | backCell,
|
---|
1540 | candidatePlane,
|
---|
1541 | mBox,
|
---|
1542 | mEpsilon);
|
---|
1543 |
|
---|
1544 | pFront = frontCell.GetArea();
|
---|
1545 | pBack = backCell.GetArea();
|
---|
1546 |
|
---|
1547 | pOverall = area;
|
---|
1548 | }
|
---|
1549 | }
|
---|
1550 |
|
---|
1551 | bool useRand;;
|
---|
1552 | int limit;
|
---|
1553 |
|
---|
1554 | // choose test polyongs randomly if over threshold
|
---|
1555 | if ((int)rays.size() > mMaxTests)
|
---|
1556 | {
|
---|
1557 | useRand = true;
|
---|
1558 | limit = mMaxTests;
|
---|
1559 | }
|
---|
1560 | else
|
---|
1561 | {
|
---|
1562 | useRand = false;
|
---|
1563 | limit = (int)rays.size();
|
---|
1564 | }
|
---|
1565 |
|
---|
1566 | for (int i = 0; i < limit; ++ i)
|
---|
1567 | {
|
---|
1568 | const int testIdx = useRand ? (int)RandomValue(0, (Real)(limit - 1)) : i;
|
---|
1569 |
|
---|
1570 | BoundedRay *bRay = rays[testIdx];
|
---|
1571 |
|
---|
1572 | Ray *ray = bRay->mRay;
|
---|
1573 | const float minT = bRay->mMinT;
|
---|
1574 | const float maxT = bRay->mMaxT;
|
---|
1575 |
|
---|
1576 | Vector3 entP, extP;
|
---|
1577 |
|
---|
1578 | const int cf =
|
---|
1579 | ray->ClassifyPlane(candidatePlane, minT, maxT, entP, extP);
|
---|
1580 |
|
---|
1581 | if (mSplitPlaneStrategy & LEAST_RAY_SPLITS)
|
---|
1582 | {
|
---|
1583 | sumBalancedRays += sBalancedRaysTable[cf];
|
---|
1584 | }
|
---|
1585 |
|
---|
1586 | if (mSplitPlaneStrategy & BALANCED_RAYS)
|
---|
1587 | {
|
---|
1588 | sumRaySplits += sLeastRaySplitsTable[cf];
|
---|
1589 | }
|
---|
1590 |
|
---|
1591 | if (mSplitPlaneStrategy & PVS)
|
---|
1592 | {
|
---|
1593 | // in case the ray intersects an object
|
---|
1594 | // assure that we only count the object
|
---|
1595 | // once for the front and once for the back side of the plane
|
---|
1596 |
|
---|
1597 | // add the termination object
|
---|
1598 | if (!ray->intersections.empty())
|
---|
1599 | AddObjToPvs(ray->intersections[0].mObject, cf, frontPvs, backPvs);
|
---|
1600 |
|
---|
1601 | // add the source object
|
---|
1602 | AddObjToPvs(ray->sourceObject.mObject, cf, frontPvs, backPvs);
|
---|
1603 |
|
---|
1604 | if (mPvsUseArea)
|
---|
1605 | {
|
---|
1606 | float len = 1;
|
---|
1607 |
|
---|
1608 | if (pvsUseLen)
|
---|
1609 | len = SqrDistance(entP, extP);
|
---|
1610 |
|
---|
1611 | // use length of rays to approximate volume
|
---|
1612 | if (Ray::BACK && Ray::COINCIDENT)
|
---|
1613 | pBack += len;
|
---|
1614 | if (Ray::FRONT && Ray::COINCIDENT)
|
---|
1615 | pFront += len;
|
---|
1616 | if (Ray::FRONT_BACK || Ray::BACK_FRONT)
|
---|
1617 | {
|
---|
1618 | if (pvsUseLen)
|
---|
1619 | {
|
---|
1620 | const Vector3 extp = ray->Extrap(maxT);
|
---|
1621 | const float t = candidatePlane.FindT(ray->GetLoc(), extp);
|
---|
1622 |
|
---|
1623 | const float newT = t * maxT;
|
---|
1624 | const float newLen = SqrDistance(ray->Extrap(newT), extp);
|
---|
1625 |
|
---|
1626 | if (Ray::FRONT_BACK)
|
---|
1627 | {
|
---|
1628 | pFront += len - newLen;
|
---|
1629 | pBack += newLen;
|
---|
1630 | }
|
---|
1631 | else
|
---|
1632 | {
|
---|
1633 | pBack += len - newLen;
|
---|
1634 | pFront += newLen;
|
---|
1635 | }
|
---|
1636 | }
|
---|
1637 | else
|
---|
1638 | {
|
---|
1639 | ++ pFront;
|
---|
1640 | ++ pBack;
|
---|
1641 | }
|
---|
1642 | }
|
---|
1643 | }
|
---|
1644 | }
|
---|
1645 | }
|
---|
1646 |
|
---|
1647 | const float raysSize = (float)rays.size() + Limits::Small;
|
---|
1648 |
|
---|
1649 | if (mSplitPlaneStrategy & LEAST_RAY_SPLITS)
|
---|
1650 | val += mLeastRaySplitsFactor * sumRaySplits / raysSize;
|
---|
1651 |
|
---|
1652 | if (mSplitPlaneStrategy & BALANCED_RAYS)
|
---|
1653 | val += mBalancedRaysFactor * fabs(sumBalancedRays) / raysSize;
|
---|
1654 |
|
---|
1655 | const float denom = pOverall * (float)pvs * 2.0f + Limits::Small;
|
---|
1656 |
|
---|
1657 | if (mSplitPlaneStrategy & PVS)
|
---|
1658 | {
|
---|
1659 | val += mPvsFactor * (frontPvs * pFront + (backPvs * pBack)) / denom;
|
---|
1660 |
|
---|
1661 | // give penalty to unbalanced split
|
---|
1662 | if (0)
|
---|
1663 | if (((pFront * 0.2 + Limits::Small) > pBack) ||
|
---|
1664 | (pFront < (pBack * 0.2 + Limits::Small)))
|
---|
1665 | val += 0.5;
|
---|
1666 | }
|
---|
1667 |
|
---|
1668 |
|
---|
1669 | #ifdef _DEBUG
|
---|
1670 | Debug << "totalpvs: " << pvs << " ptotal: " << pOverall
|
---|
1671 | << " frontpvs: " << frontPvs << " pFront: " << pFront
|
---|
1672 | << " backpvs: " << backPvs << " pBack: " << pBack << endl << endl;
|
---|
1673 | #endif
|
---|
1674 |
|
---|
1675 | return val;
|
---|
1676 | }
|
---|
1677 |
|
---|
1678 | void BspTree::AddObjToPvs(Intersectable *obj,
|
---|
1679 | const int cf,
|
---|
1680 | int &frontPvs,
|
---|
1681 | int &backPvs) const
|
---|
1682 | {
|
---|
1683 | if (!obj)
|
---|
1684 | return;
|
---|
1685 | // TODO: does this really belong to no pvs?
|
---|
1686 | //if (cf == Ray::COINCIDENT) return;
|
---|
1687 |
|
---|
1688 | // object belongs to both PVS
|
---|
1689 | const bool bothSides = (cf == Ray::FRONT_BACK) ||
|
---|
1690 | (cf == Ray::BACK_FRONT) ||
|
---|
1691 | (cf == Ray::COINCIDENT);
|
---|
1692 |
|
---|
1693 | if ((cf == Ray::FRONT) || bothSides)
|
---|
1694 | {
|
---|
1695 | if ((obj->mMailbox != sFrontId) &&
|
---|
1696 | (obj->mMailbox != sFrontAndBackId))
|
---|
1697 | {
|
---|
1698 | ++ frontPvs;
|
---|
1699 |
|
---|
1700 | if (obj->mMailbox == sBackId)
|
---|
1701 | obj->mMailbox = sFrontAndBackId;
|
---|
1702 | else
|
---|
1703 | obj->mMailbox = sFrontId;
|
---|
1704 | }
|
---|
1705 | }
|
---|
1706 |
|
---|
1707 | if ((cf == Ray::BACK) || bothSides)
|
---|
1708 | {
|
---|
1709 | if ((obj->mMailbox != sBackId) &&
|
---|
1710 | (obj->mMailbox != sFrontAndBackId))
|
---|
1711 | {
|
---|
1712 | ++ backPvs;
|
---|
1713 |
|
---|
1714 | if (obj->mMailbox == sFrontId)
|
---|
1715 | obj->mMailbox = sFrontAndBackId;
|
---|
1716 | else
|
---|
1717 | obj->mMailbox = sBackId;
|
---|
1718 | }
|
---|
1719 | }
|
---|
1720 | }
|
---|
1721 |
|
---|
1722 | float BspTree::SplitPlaneCost(const Plane3 &candidatePlane,
|
---|
1723 | BspTraversalData &data) const
|
---|
1724 | {
|
---|
1725 | float val = 0;
|
---|
1726 |
|
---|
1727 | if (mSplitPlaneStrategy & VERTICAL_AXIS)
|
---|
1728 | {
|
---|
1729 | Vector3 tinyAxis(0,0,0); tinyAxis[mBox.Size().TinyAxis()] = 1.0f;
|
---|
1730 | // we put a penalty on the dot product between the "tiny" vertical axis
|
---|
1731 | // and the split plane axis
|
---|
1732 | val += mVerticalSplitsFactor *
|
---|
1733 | fabs(DotProd(candidatePlane.mNormal, tinyAxis));
|
---|
1734 | }
|
---|
1735 |
|
---|
1736 | // the following criteria loop over all polygons to find the cost value
|
---|
1737 | if ((mSplitPlaneStrategy & BALANCED_POLYS) ||
|
---|
1738 | (mSplitPlaneStrategy & LEAST_SPLITS) ||
|
---|
1739 | (mSplitPlaneStrategy & LARGEST_POLY_AREA) ||
|
---|
1740 | (mSplitPlaneStrategy & BALANCED_VIEW_CELLS) ||
|
---|
1741 | (mSplitPlaneStrategy & BLOCKED_RAYS))
|
---|
1742 | {
|
---|
1743 | val += SplitPlaneCost(candidatePlane, *data.mPolygons);
|
---|
1744 | }
|
---|
1745 |
|
---|
1746 | // the following criteria loop over all rays to find the cost value
|
---|
1747 | if ((mSplitPlaneStrategy & BALANCED_RAYS) ||
|
---|
1748 | (mSplitPlaneStrategy & LEAST_RAY_SPLITS) ||
|
---|
1749 | (mSplitPlaneStrategy & PVS))
|
---|
1750 | {
|
---|
1751 | val += SplitPlaneCost(candidatePlane, *data.mRays, data.mPvs,
|
---|
1752 | data.mArea, *data.mGeometry);
|
---|
1753 | }
|
---|
1754 |
|
---|
1755 | // return linear combination of the sums
|
---|
1756 | return val;
|
---|
1757 | }
|
---|
1758 |
|
---|
1759 | void BspTree::CollectLeaves(vector<BspLeaf *> &leaves) const
|
---|
1760 | {
|
---|
1761 | stack<BspNode *> nodeStack;
|
---|
1762 | nodeStack.push(mRoot);
|
---|
1763 |
|
---|
1764 | while (!nodeStack.empty())
|
---|
1765 | {
|
---|
1766 | BspNode *node = nodeStack.top();
|
---|
1767 |
|
---|
1768 | nodeStack.pop();
|
---|
1769 |
|
---|
1770 | if (node->IsLeaf())
|
---|
1771 | {
|
---|
1772 | BspLeaf *leaf = (BspLeaf *)node;
|
---|
1773 | leaves.push_back(leaf);
|
---|
1774 | }
|
---|
1775 | else
|
---|
1776 | {
|
---|
1777 | BspInterior *interior = dynamic_cast<BspInterior *>(node);
|
---|
1778 |
|
---|
1779 | nodeStack.push(interior->GetBack());
|
---|
1780 | nodeStack.push(interior->GetFront());
|
---|
1781 | }
|
---|
1782 | }
|
---|
1783 | }
|
---|
1784 |
|
---|
1785 |
|
---|
1786 | AxisAlignedBox3 BspTree::GetBoundingBox() const
|
---|
1787 | {
|
---|
1788 | return mBox;
|
---|
1789 | }
|
---|
1790 |
|
---|
1791 |
|
---|
1792 | BspNode *BspTree::GetRoot() const
|
---|
1793 | {
|
---|
1794 | return mRoot;
|
---|
1795 | }
|
---|
1796 |
|
---|
1797 | void BspTree::EvaluateLeafStats(const BspTraversalData &data)
|
---|
1798 | {
|
---|
1799 | // the node became a leaf -> evaluate stats for leafs
|
---|
1800 | BspLeaf *leaf = dynamic_cast<BspLeaf *>(data.mNode);
|
---|
1801 |
|
---|
1802 | // store maximal and minimal depth
|
---|
1803 | if (data.mDepth > mStat.maxDepth)
|
---|
1804 | mStat.maxDepth = data.mDepth;
|
---|
1805 |
|
---|
1806 | if (data.mDepth < mStat.minDepth)
|
---|
1807 | mStat.minDepth = data.mDepth;
|
---|
1808 |
|
---|
1809 | // accumulate depth to compute average depth
|
---|
1810 | mStat.accumDepth += data.mDepth;
|
---|
1811 |
|
---|
1812 |
|
---|
1813 | if (data.mDepth >= mTermMaxDepth)
|
---|
1814 | ++ mStat.maxDepthNodes;
|
---|
1815 |
|
---|
1816 | if (data.mPvs < mTermMinPvs)
|
---|
1817 | ++ mStat.minPvsNodes;
|
---|
1818 |
|
---|
1819 | if ((int)data.mRays->size() < mTermMinRays)
|
---|
1820 | ++ mStat.minRaysNodes;
|
---|
1821 |
|
---|
1822 | if (data.GetAvgRayContribution() > mTermMaxRayContribution)
|
---|
1823 | ++ mStat.maxRayContribNodes;
|
---|
1824 |
|
---|
1825 | if (data.mGeometry->GetArea() <= mTermMinArea)
|
---|
1826 | ++ mStat.minAreaNodes;
|
---|
1827 |
|
---|
1828 | #ifdef _DEBUG
|
---|
1829 | Debug << "BSP stats: "
|
---|
1830 | << "Depth: " << data.mDepth << " (max: " << mTermMaxDepth << "), "
|
---|
1831 | << "PVS: " << data.mPvs << " (min: " << mTermMinPvs << "), "
|
---|
1832 | << "Area: " << data.mArea << " (min: " << mTermMinArea << "), "
|
---|
1833 | << "#polygons: " << (int)data.mPolygons->size() << " (max: " << mTermMinPolys << "), "
|
---|
1834 | << "#rays: " << (int)data.mRays->size() << " (max: " << mTermMinRays << "), "
|
---|
1835 | << "#pvs: " << leaf->GetViewCell()->GetPvs().GetSize() << "=, "
|
---|
1836 | << "#avg ray contrib (pvs): " << (float)data.mPvs / (float)data.mRays->size() << endl;
|
---|
1837 | #endif
|
---|
1838 | }
|
---|
1839 |
|
---|
1840 | int
|
---|
1841 | BspTree::_CastRay(Ray &ray)
|
---|
1842 | {
|
---|
1843 | int hits = 0;
|
---|
1844 |
|
---|
1845 | stack<BspRayTraversalData> tStack;
|
---|
1846 |
|
---|
1847 | float maxt, mint;
|
---|
1848 |
|
---|
1849 | if (!mBox.GetRaySegment(ray, mint, maxt))
|
---|
1850 | return 0;
|
---|
1851 |
|
---|
1852 | Intersectable::NewMail();
|
---|
1853 |
|
---|
1854 | Vector3 entp = ray.Extrap(mint);
|
---|
1855 | Vector3 extp = ray.Extrap(maxt);
|
---|
1856 |
|
---|
1857 | BspNode *node = mRoot;
|
---|
1858 | BspNode *farChild = NULL;
|
---|
1859 |
|
---|
1860 | while (1)
|
---|
1861 | {
|
---|
1862 | if (!node->IsLeaf())
|
---|
1863 | {
|
---|
1864 | BspInterior *in = dynamic_cast<BspInterior *>(node);
|
---|
1865 |
|
---|
1866 | Plane3 splitPlane = in->GetPlane();
|
---|
1867 | const int entSide = splitPlane.Side(entp);
|
---|
1868 | const int extSide = splitPlane.Side(extp);
|
---|
1869 |
|
---|
1870 | if (entSide < 0)
|
---|
1871 | {
|
---|
1872 | node = in->GetBack();
|
---|
1873 |
|
---|
1874 | if(extSide <= 0) // plane does not split ray => no far child
|
---|
1875 | continue;
|
---|
1876 |
|
---|
1877 | farChild = in->GetFront(); // plane splits ray
|
---|
1878 |
|
---|
1879 | } else if (entSide > 0)
|
---|
1880 | {
|
---|
1881 | node = in->GetFront();
|
---|
1882 |
|
---|
1883 | if (extSide >= 0) // plane does not split ray => no far child
|
---|
1884 | continue;
|
---|
1885 |
|
---|
1886 | farChild = in->GetBack(); // plane splits ray
|
---|
1887 | }
|
---|
1888 | else // ray and plane are coincident
|
---|
1889 | {
|
---|
1890 | // WHAT TO DO IN THIS CASE ?
|
---|
1891 | //break;
|
---|
1892 | node = in->GetFront();
|
---|
1893 | continue;
|
---|
1894 | }
|
---|
1895 |
|
---|
1896 | // push data for far child
|
---|
1897 | tStack.push(BspRayTraversalData(farChild, extp, maxt));
|
---|
1898 |
|
---|
1899 | // find intersection of ray segment with plane
|
---|
1900 | float t;
|
---|
1901 | extp = splitPlane.FindIntersection(ray.GetLoc(), extp, &t);
|
---|
1902 | maxt *= t;
|
---|
1903 |
|
---|
1904 | } else // reached leaf => intersection with view cell
|
---|
1905 | {
|
---|
1906 | BspLeaf *leaf = dynamic_cast<BspLeaf *>(node);
|
---|
1907 |
|
---|
1908 | if (!leaf->mViewCell->Mailed())
|
---|
1909 | {
|
---|
1910 | // ray.bspIntersections.push_back(Ray::BspIntersection(maxt, leaf));
|
---|
1911 | leaf->mViewCell->Mail();
|
---|
1912 | ++ hits;
|
---|
1913 | }
|
---|
1914 |
|
---|
1915 | //-- fetch the next far child from the stack
|
---|
1916 | if (tStack.empty())
|
---|
1917 | break;
|
---|
1918 |
|
---|
1919 | entp = extp;
|
---|
1920 | mint = maxt; // NOTE: need this?
|
---|
1921 |
|
---|
1922 | if (ray.GetType() == Ray::LINE_SEGMENT && mint > 1.0f)
|
---|
1923 | break;
|
---|
1924 |
|
---|
1925 | BspRayTraversalData &s = tStack.top();
|
---|
1926 |
|
---|
1927 | node = s.mNode;
|
---|
1928 | extp = s.mExitPoint;
|
---|
1929 | maxt = s.mMaxT;
|
---|
1930 |
|
---|
1931 | tStack.pop();
|
---|
1932 | }
|
---|
1933 | }
|
---|
1934 |
|
---|
1935 | return hits;
|
---|
1936 | }
|
---|
1937 |
|
---|
1938 |
|
---|
1939 | int BspTree::CastLineSegment(const Vector3 &origin,
|
---|
1940 | const Vector3 &termination,
|
---|
1941 | vector<ViewCell *> &viewcells)
|
---|
1942 | {
|
---|
1943 | int hits = 0;
|
---|
1944 | stack<BspRayTraversalData> tStack;
|
---|
1945 |
|
---|
1946 | float mint = 0.0f, maxt = 1.0f;
|
---|
1947 |
|
---|
1948 | Intersectable::NewMail();
|
---|
1949 |
|
---|
1950 | Vector3 entp = origin;
|
---|
1951 | Vector3 extp = termination;
|
---|
1952 |
|
---|
1953 | BspNode *node = mRoot;
|
---|
1954 | BspNode *farChild = NULL;
|
---|
1955 |
|
---|
1956 | while (1)
|
---|
1957 | {
|
---|
1958 | if (!node->IsLeaf())
|
---|
1959 | {
|
---|
1960 | BspInterior *in = dynamic_cast<BspInterior *>(node);
|
---|
1961 |
|
---|
1962 | Plane3 splitPlane = in->GetPlane();
|
---|
1963 |
|
---|
1964 | const int entSide = splitPlane.Side(entp);
|
---|
1965 | const int extSide = splitPlane.Side(extp);
|
---|
1966 |
|
---|
1967 | if (entSide < 0)
|
---|
1968 | {
|
---|
1969 | node = in->GetBack();
|
---|
1970 |
|
---|
1971 | if(extSide <= 0) // plane does not split ray => no far child
|
---|
1972 | continue;
|
---|
1973 |
|
---|
1974 | farChild = in->GetFront(); // plane splits ray
|
---|
1975 |
|
---|
1976 | }
|
---|
1977 | else if (entSide > 0)
|
---|
1978 | {
|
---|
1979 | node = in->GetFront();
|
---|
1980 |
|
---|
1981 | if (extSide >= 0) // plane does not split ray => no far child
|
---|
1982 | continue;
|
---|
1983 |
|
---|
1984 | farChild = in->GetBack(); // plane splits ray
|
---|
1985 | }
|
---|
1986 | else // ray and plane are coincident
|
---|
1987 | {
|
---|
1988 | // WHAT TO DO IN THIS CASE ?
|
---|
1989 | //break;
|
---|
1990 | node = in->GetFront();
|
---|
1991 | continue;
|
---|
1992 | }
|
---|
1993 |
|
---|
1994 | // push data for far child
|
---|
1995 | tStack.push(BspRayTraversalData(farChild, extp, maxt));
|
---|
1996 |
|
---|
1997 | // find intersection of ray segment with plane
|
---|
1998 | float t;
|
---|
1999 | extp = splitPlane.FindIntersection(origin, extp, &t);
|
---|
2000 | maxt *= t;
|
---|
2001 | }
|
---|
2002 | else
|
---|
2003 | {
|
---|
2004 | // reached leaf => intersection with view cell
|
---|
2005 | BspLeaf *leaf = dynamic_cast<BspLeaf *>(node);
|
---|
2006 |
|
---|
2007 | if (!leaf->mViewCell->Mailed())
|
---|
2008 | {
|
---|
2009 | viewcells.push_back(leaf->mViewCell);
|
---|
2010 | leaf->mViewCell->Mail();
|
---|
2011 | hits++;
|
---|
2012 | }
|
---|
2013 |
|
---|
2014 | //-- fetch the next far child from the stack
|
---|
2015 | if (tStack.empty())
|
---|
2016 | break;
|
---|
2017 |
|
---|
2018 | entp = extp;
|
---|
2019 | mint = maxt; // NOTE: need this?
|
---|
2020 |
|
---|
2021 | BspRayTraversalData &s = tStack.top();
|
---|
2022 |
|
---|
2023 | node = s.mNode;
|
---|
2024 | extp = s.mExitPoint;
|
---|
2025 | maxt = s.mMaxT;
|
---|
2026 |
|
---|
2027 | tStack.pop();
|
---|
2028 | }
|
---|
2029 | }
|
---|
2030 | return hits;
|
---|
2031 | }
|
---|
2032 |
|
---|
2033 | bool BspTree::Export(const string filename)
|
---|
2034 | {
|
---|
2035 | Exporter *exporter = Exporter::GetExporter(filename);
|
---|
2036 |
|
---|
2037 | if (exporter)
|
---|
2038 | {
|
---|
2039 | exporter->ExportBspTree(*this);
|
---|
2040 | return true;
|
---|
2041 | }
|
---|
2042 |
|
---|
2043 | return false;
|
---|
2044 | }
|
---|
2045 |
|
---|
2046 | void BspTree::CollectViewCells(ViewCellContainer &viewCells) const
|
---|
2047 | {
|
---|
2048 | stack<BspNode *> nodeStack;
|
---|
2049 | nodeStack.push(mRoot);
|
---|
2050 |
|
---|
2051 | ViewCell::NewMail();
|
---|
2052 |
|
---|
2053 | while (!nodeStack.empty())
|
---|
2054 | {
|
---|
2055 | BspNode *node = nodeStack.top();
|
---|
2056 | nodeStack.pop();
|
---|
2057 |
|
---|
2058 | if (node->IsLeaf())
|
---|
2059 | {
|
---|
2060 | ViewCell *viewCell = dynamic_cast<BspLeaf *>(node)->mViewCell;
|
---|
2061 |
|
---|
2062 | if (!viewCell->Mailed())
|
---|
2063 | {
|
---|
2064 | viewCell->Mail();
|
---|
2065 | viewCells.push_back(viewCell);
|
---|
2066 | }
|
---|
2067 | }
|
---|
2068 | else
|
---|
2069 | {
|
---|
2070 | BspInterior *interior = dynamic_cast<BspInterior *>(node);
|
---|
2071 |
|
---|
2072 | nodeStack.push(interior->GetFront());
|
---|
2073 | nodeStack.push(interior->GetBack());
|
---|
2074 | }
|
---|
2075 | }
|
---|
2076 | }
|
---|
2077 |
|
---|
2078 |
|
---|
2079 | BspTreeStatistics &BspTree::GetStat()
|
---|
2080 | {
|
---|
2081 | return mStat;
|
---|
2082 | }
|
---|
2083 |
|
---|
2084 |
|
---|
2085 | float BspTree::AccumulatedRayLength(BoundedRayContainer &rays) const
|
---|
2086 | {
|
---|
2087 | float len = 0;
|
---|
2088 |
|
---|
2089 | BoundedRayContainer::const_iterator it, it_end = rays.end();
|
---|
2090 |
|
---|
2091 | for (it = rays.begin(); it != it_end; ++ it)
|
---|
2092 | {
|
---|
2093 | len += SqrDistance((*it)->mRay->Extrap((*it)->mMinT),
|
---|
2094 | (*it)->mRay->Extrap((*it)->mMaxT));
|
---|
2095 | }
|
---|
2096 |
|
---|
2097 | return len;
|
---|
2098 | }
|
---|
2099 |
|
---|
2100 |
|
---|
2101 | int BspTree::SplitRays(const Plane3 &plane,
|
---|
2102 | BoundedRayContainer &rays,
|
---|
2103 | BoundedRayContainer &frontRays,
|
---|
2104 | BoundedRayContainer &backRays)
|
---|
2105 | {
|
---|
2106 | int splits = 0;
|
---|
2107 |
|
---|
2108 | while (!rays.empty())
|
---|
2109 | {
|
---|
2110 | BoundedRay *bRay = rays.back();
|
---|
2111 | Ray *ray = bRay->mRay;
|
---|
2112 | float minT = bRay->mMinT;
|
---|
2113 | float maxT = bRay->mMaxT;
|
---|
2114 |
|
---|
2115 | rays.pop_back();
|
---|
2116 |
|
---|
2117 | Vector3 entP, extP;
|
---|
2118 |
|
---|
2119 | const int cf =
|
---|
2120 | ray->ClassifyPlane(plane, minT, maxT, entP, extP);
|
---|
2121 |
|
---|
2122 | // set id to ray classification
|
---|
2123 | ray->SetId(cf);
|
---|
2124 |
|
---|
2125 | switch (cf)
|
---|
2126 | {
|
---|
2127 | case Ray::COINCIDENT: // TODO: should really discard ray?
|
---|
2128 | frontRays.push_back(bRay);
|
---|
2129 | //DEL_PTR(bRay);
|
---|
2130 | break;
|
---|
2131 | case Ray::BACK:
|
---|
2132 | backRays.push_back(bRay);
|
---|
2133 | break;
|
---|
2134 | case Ray::FRONT:
|
---|
2135 | frontRays.push_back(bRay);
|
---|
2136 | break;
|
---|
2137 | case Ray::FRONT_BACK:
|
---|
2138 | {
|
---|
2139 | // find intersection of ray segment with plane
|
---|
2140 | const float t = plane.FindT(ray->GetLoc(), extP);
|
---|
2141 |
|
---|
2142 | const float newT = t * maxT;
|
---|
2143 |
|
---|
2144 | frontRays.push_back(new BoundedRay(ray, minT, newT));
|
---|
2145 | backRays.push_back(new BoundedRay(ray, newT, maxT));
|
---|
2146 |
|
---|
2147 | DEL_PTR(bRay);
|
---|
2148 | }
|
---|
2149 | break;
|
---|
2150 | case Ray::BACK_FRONT:
|
---|
2151 | {
|
---|
2152 | // find intersection of ray segment with plane
|
---|
2153 | const float t = plane.FindT(ray->GetLoc(), extP);
|
---|
2154 | const float newT = t * bRay->mMaxT;
|
---|
2155 |
|
---|
2156 | backRays.push_back(new BoundedRay(ray, minT, newT));
|
---|
2157 | frontRays.push_back(new BoundedRay(ray, newT, maxT));
|
---|
2158 |
|
---|
2159 | DEL_PTR(bRay);
|
---|
2160 |
|
---|
2161 | ++ splits;
|
---|
2162 | }
|
---|
2163 | break;
|
---|
2164 | default:
|
---|
2165 | Debug << "Should not come here 4" << endl;
|
---|
2166 | break;
|
---|
2167 | }
|
---|
2168 | }
|
---|
2169 |
|
---|
2170 | return splits;
|
---|
2171 | }
|
---|
2172 |
|
---|
2173 | void BspTree::ExtractHalfSpaces(BspNode *n, vector<Plane3> &halfSpaces) const
|
---|
2174 | {
|
---|
2175 | BspNode *lastNode;
|
---|
2176 | do
|
---|
2177 | {
|
---|
2178 | lastNode = n;
|
---|
2179 |
|
---|
2180 | // want to get planes defining geometry of this node => don't take
|
---|
2181 | // split plane of node itself
|
---|
2182 | n = n->GetParent();
|
---|
2183 |
|
---|
2184 | if (n)
|
---|
2185 | {
|
---|
2186 | BspInterior *interior = dynamic_cast<BspInterior *>(n);
|
---|
2187 | Plane3 halfSpace = dynamic_cast<BspInterior *>(interior)->GetPlane();
|
---|
2188 |
|
---|
2189 | if (interior->GetFront() != lastNode)
|
---|
2190 | halfSpace.ReverseOrientation();
|
---|
2191 |
|
---|
2192 | halfSpaces.push_back(halfSpace);
|
---|
2193 | }
|
---|
2194 | }
|
---|
2195 | while (n);
|
---|
2196 | }
|
---|
2197 |
|
---|
2198 | void BspTree::ConstructGeometry(BspNode *n, BspNodeGeometry &cell) const
|
---|
2199 | {
|
---|
2200 | PolygonContainer polys;
|
---|
2201 | ConstructGeometry(n, polys);
|
---|
2202 | cell.mPolys = polys;
|
---|
2203 | }
|
---|
2204 |
|
---|
2205 | void BspTree::ConstructGeometry(BspViewCell *vc, PolygonContainer &cell) const
|
---|
2206 | {
|
---|
2207 | vector<BspLeaf *> leaves = vc->mLeaves;
|
---|
2208 |
|
---|
2209 | vector<BspLeaf *>::const_iterator it, it_end = leaves.end();
|
---|
2210 |
|
---|
2211 | for (it = leaves.begin(); it != it_end; ++ it)
|
---|
2212 | ConstructGeometry(*it, cell);
|
---|
2213 | }
|
---|
2214 |
|
---|
2215 |
|
---|
2216 | void BspTree::ConstructGeometry(BspNode *n, PolygonContainer &cell) const
|
---|
2217 | {
|
---|
2218 | vector<Plane3> halfSpaces;
|
---|
2219 | ExtractHalfSpaces(n, halfSpaces);
|
---|
2220 |
|
---|
2221 | PolygonContainer candidates;
|
---|
2222 |
|
---|
2223 | // bounded planes are added to the polygons (reverse polygons
|
---|
2224 | // as they have to be outfacing
|
---|
2225 | for (int i = 0; i < (int)halfSpaces.size(); ++ i)
|
---|
2226 | {
|
---|
2227 | Polygon3 *p = GetBoundingBox().CrossSection(halfSpaces[i]);
|
---|
2228 |
|
---|
2229 | if (p->Valid(mEpsilon))
|
---|
2230 | {
|
---|
2231 | candidates.push_back(p->CreateReversePolygon());
|
---|
2232 | DEL_PTR(p);
|
---|
2233 | }
|
---|
2234 | }
|
---|
2235 |
|
---|
2236 | // add faces of bounding box (also could be faces of the cell)
|
---|
2237 | for (int i = 0; i < 6; ++ i)
|
---|
2238 | {
|
---|
2239 | VertexContainer vertices;
|
---|
2240 |
|
---|
2241 | for (int j = 0; j < 4; ++ j)
|
---|
2242 | vertices.push_back(mBox.GetFace(i).mVertices[j]);
|
---|
2243 |
|
---|
2244 | candidates.push_back(new Polygon3(vertices));
|
---|
2245 | }
|
---|
2246 |
|
---|
2247 | for (int i = 0; i < (int)candidates.size(); ++ i)
|
---|
2248 | {
|
---|
2249 | // polygon is split by all other planes
|
---|
2250 | for (int j = 0; (j < (int)halfSpaces.size()) && candidates[i]; ++ j)
|
---|
2251 | {
|
---|
2252 | if (i == j) // polygon and plane are coincident
|
---|
2253 | continue;
|
---|
2254 |
|
---|
2255 | VertexContainer splitPts;
|
---|
2256 | Polygon3 *frontPoly, *backPoly;
|
---|
2257 |
|
---|
2258 | const int cf = candidates[i]->
|
---|
2259 | ClassifyPlane(halfSpaces[j], mEpsilon);
|
---|
2260 |
|
---|
2261 | switch (cf)
|
---|
2262 | {
|
---|
2263 | case Polygon3::SPLIT:
|
---|
2264 | frontPoly = new Polygon3();
|
---|
2265 | backPoly = new Polygon3();
|
---|
2266 |
|
---|
2267 | candidates[i]->Split(halfSpaces[j],
|
---|
2268 | *frontPoly,
|
---|
2269 | *backPoly,
|
---|
2270 | mEpsilon);
|
---|
2271 |
|
---|
2272 | DEL_PTR(candidates[i]);
|
---|
2273 |
|
---|
2274 | if (frontPoly->Valid(mEpsilon))
|
---|
2275 | candidates[i] = frontPoly;
|
---|
2276 | else
|
---|
2277 | DEL_PTR(frontPoly);
|
---|
2278 |
|
---|
2279 | DEL_PTR(backPoly);
|
---|
2280 | break;
|
---|
2281 | case Polygon3::BACK_SIDE:
|
---|
2282 | DEL_PTR(candidates[i]);
|
---|
2283 | break;
|
---|
2284 | // just take polygon as it is
|
---|
2285 | case Polygon3::FRONT_SIDE:
|
---|
2286 | case Polygon3::COINCIDENT:
|
---|
2287 | default:
|
---|
2288 | break;
|
---|
2289 | }
|
---|
2290 | }
|
---|
2291 |
|
---|
2292 | if (candidates[i])
|
---|
2293 | cell.push_back(candidates[i]);
|
---|
2294 | }
|
---|
2295 | }
|
---|
2296 |
|
---|
2297 |
|
---|
2298 | int BspTree::FindNeighbors(BspNode *n, vector<BspLeaf *> &neighbors,
|
---|
2299 | const bool onlyUnmailed) const
|
---|
2300 | {
|
---|
2301 | PolygonContainer cell;
|
---|
2302 |
|
---|
2303 | ConstructGeometry(n, cell);
|
---|
2304 |
|
---|
2305 | stack<BspNode *> nodeStack;
|
---|
2306 | nodeStack.push(mRoot);
|
---|
2307 |
|
---|
2308 | // planes needed to verify that we found neighbor leaf.
|
---|
2309 | vector<Plane3> halfSpaces;
|
---|
2310 | ExtractHalfSpaces(n, halfSpaces);
|
---|
2311 |
|
---|
2312 | while (!nodeStack.empty())
|
---|
2313 | {
|
---|
2314 | BspNode *node = nodeStack.top();
|
---|
2315 | nodeStack.pop();
|
---|
2316 |
|
---|
2317 | if (node->IsLeaf())
|
---|
2318 | {
|
---|
2319 | if (node != n && (!onlyUnmailed || !node->Mailed()))
|
---|
2320 | {
|
---|
2321 | // test all planes of current node if candidate really
|
---|
2322 | // is neighbour
|
---|
2323 | PolygonContainer neighborCandidate;
|
---|
2324 | ConstructGeometry(node, neighborCandidate);
|
---|
2325 |
|
---|
2326 | bool isAdjacent = true;
|
---|
2327 | for (int i = 0; (i < halfSpaces.size()) && isAdjacent; ++ i)
|
---|
2328 | {
|
---|
2329 | const int cf =
|
---|
2330 | Polygon3::ClassifyPlane(neighborCandidate,
|
---|
2331 | halfSpaces[i],
|
---|
2332 | mEpsilon);
|
---|
2333 |
|
---|
2334 | if (cf == Polygon3::BACK_SIDE)
|
---|
2335 | isAdjacent = false;
|
---|
2336 | }
|
---|
2337 |
|
---|
2338 | if (isAdjacent)
|
---|
2339 | neighbors.push_back(dynamic_cast<BspLeaf *>(node));
|
---|
2340 |
|
---|
2341 | CLEAR_CONTAINER(neighborCandidate);
|
---|
2342 | }
|
---|
2343 | }
|
---|
2344 | else
|
---|
2345 | {
|
---|
2346 | BspInterior *interior = dynamic_cast<BspInterior *>(node);
|
---|
2347 |
|
---|
2348 | const int cf = Polygon3::ClassifyPlane(cell,
|
---|
2349 | interior->mPlane,
|
---|
2350 | mEpsilon);
|
---|
2351 |
|
---|
2352 | if (cf == Polygon3::FRONT_SIDE)
|
---|
2353 | nodeStack.push(interior->GetFront());
|
---|
2354 | else
|
---|
2355 | if (cf == Polygon3::BACK_SIDE)
|
---|
2356 | nodeStack.push(interior->GetBack());
|
---|
2357 | else
|
---|
2358 | {
|
---|
2359 | // random decision
|
---|
2360 | nodeStack.push(interior->GetBack());
|
---|
2361 | nodeStack.push(interior->GetFront());
|
---|
2362 | }
|
---|
2363 | }
|
---|
2364 | }
|
---|
2365 |
|
---|
2366 | CLEAR_CONTAINER(cell);
|
---|
2367 | return (int)neighbors.size();
|
---|
2368 | }
|
---|
2369 |
|
---|
2370 | BspLeaf *BspTree::GetRandomLeaf(const Plane3 &halfspace)
|
---|
2371 | {
|
---|
2372 | stack<BspNode *> nodeStack;
|
---|
2373 | nodeStack.push(mRoot);
|
---|
2374 |
|
---|
2375 | int mask = rand();
|
---|
2376 |
|
---|
2377 | while (!nodeStack.empty())
|
---|
2378 | {
|
---|
2379 | BspNode *node = nodeStack.top();
|
---|
2380 | nodeStack.pop();
|
---|
2381 |
|
---|
2382 | if (node->IsLeaf())
|
---|
2383 | {
|
---|
2384 | return dynamic_cast<BspLeaf *>(node);
|
---|
2385 | }
|
---|
2386 | else
|
---|
2387 | {
|
---|
2388 | BspInterior *interior = dynamic_cast<BspInterior *>(node);
|
---|
2389 |
|
---|
2390 | BspNode *next;
|
---|
2391 |
|
---|
2392 | PolygonContainer cell;
|
---|
2393 |
|
---|
2394 | // todo: not very efficient: constructs full cell everytime
|
---|
2395 | ConstructGeometry(interior, cell);
|
---|
2396 |
|
---|
2397 | const int cf = Polygon3::ClassifyPlane(cell,
|
---|
2398 | halfspace,
|
---|
2399 | mEpsilon);
|
---|
2400 |
|
---|
2401 | if (cf == Polygon3::BACK_SIDE)
|
---|
2402 | next = interior->GetFront();
|
---|
2403 | else
|
---|
2404 | if (cf == Polygon3::FRONT_SIDE)
|
---|
2405 | next = interior->GetFront();
|
---|
2406 | else
|
---|
2407 | {
|
---|
2408 | // random decision
|
---|
2409 | if (mask & 1)
|
---|
2410 | next = interior->GetBack();
|
---|
2411 | else
|
---|
2412 | next = interior->GetFront();
|
---|
2413 | mask = mask >> 1;
|
---|
2414 | }
|
---|
2415 |
|
---|
2416 | nodeStack.push(next);
|
---|
2417 | }
|
---|
2418 | }
|
---|
2419 |
|
---|
2420 | return NULL;
|
---|
2421 | }
|
---|
2422 |
|
---|
2423 | BspLeaf *BspTree::GetRandomLeaf(const bool onlyUnmailed)
|
---|
2424 | {
|
---|
2425 | stack<BspNode *> nodeStack;
|
---|
2426 |
|
---|
2427 | nodeStack.push(mRoot);
|
---|
2428 |
|
---|
2429 | int mask = rand();
|
---|
2430 |
|
---|
2431 | while (!nodeStack.empty())
|
---|
2432 | {
|
---|
2433 | BspNode *node = nodeStack.top();
|
---|
2434 | nodeStack.pop();
|
---|
2435 |
|
---|
2436 | if (node->IsLeaf())
|
---|
2437 | {
|
---|
2438 | if ( (!onlyUnmailed || !node->Mailed()) )
|
---|
2439 | return dynamic_cast<BspLeaf *>(node);
|
---|
2440 | }
|
---|
2441 | else
|
---|
2442 | {
|
---|
2443 | BspInterior *interior = dynamic_cast<BspInterior *>(node);
|
---|
2444 |
|
---|
2445 | // random decision
|
---|
2446 | if (mask & 1)
|
---|
2447 | nodeStack.push(interior->GetBack());
|
---|
2448 | else
|
---|
2449 | nodeStack.push(interior->GetFront());
|
---|
2450 |
|
---|
2451 | mask = mask >> 1;
|
---|
2452 | }
|
---|
2453 | }
|
---|
2454 |
|
---|
2455 | return NULL;
|
---|
2456 | }
|
---|
2457 |
|
---|
2458 | void BspTree::AddToPvs(BspLeaf *leaf,
|
---|
2459 | const BoundedRayContainer &rays,
|
---|
2460 | int &sampleContributions,
|
---|
2461 | int &contributingSamples)
|
---|
2462 | {
|
---|
2463 | sampleContributions = 0;
|
---|
2464 | contributingSamples = 0;
|
---|
2465 |
|
---|
2466 | BoundedRayContainer::const_iterator it, it_end = rays.end();
|
---|
2467 |
|
---|
2468 | ViewCell *vc = leaf->GetViewCell();
|
---|
2469 |
|
---|
2470 | // add contributions from samples to the PVS
|
---|
2471 | for (it = rays.begin(); it != it_end; ++ it)
|
---|
2472 | {
|
---|
2473 | int contribution = 0;
|
---|
2474 | Ray *ray = (*it)->mRay;
|
---|
2475 | float relContribution;
|
---|
2476 | if (!ray->intersections.empty())
|
---|
2477 | contribution += vc->GetPvs().AddSample(ray->intersections[0].mObject, relContribution);
|
---|
2478 |
|
---|
2479 | if (ray->sourceObject.mObject)
|
---|
2480 | contribution += vc->GetPvs().AddSample(ray->sourceObject.mObject, relContribution);
|
---|
2481 |
|
---|
2482 | if (contribution)
|
---|
2483 | {
|
---|
2484 | sampleContributions += contribution;
|
---|
2485 | ++ contributingSamples;
|
---|
2486 | }
|
---|
2487 |
|
---|
2488 | //if (ray->mFlags & Ray::STORE_BSP_INTERSECTIONS)
|
---|
2489 | // ray->bspIntersections.push_back(Ray::BspIntersection((*it)->mMinT, this));
|
---|
2490 | }
|
---|
2491 | }
|
---|
2492 |
|
---|
2493 | int BspTree::ComputePvsSize(const BoundedRayContainer &rays) const
|
---|
2494 | {
|
---|
2495 | int pvsSize = 0;
|
---|
2496 |
|
---|
2497 | BoundedRayContainer::const_iterator rit, rit_end = rays.end();
|
---|
2498 |
|
---|
2499 | Intersectable::NewMail();
|
---|
2500 |
|
---|
2501 | for (rit = rays.begin(); rit != rays.end(); ++ rit)
|
---|
2502 | {
|
---|
2503 | Ray *ray = (*rit)->mRay;
|
---|
2504 |
|
---|
2505 | if (!ray->intersections.empty())
|
---|
2506 | {
|
---|
2507 | if (!ray->intersections[0].mObject->Mailed())
|
---|
2508 | {
|
---|
2509 | ray->intersections[0].mObject->Mail();
|
---|
2510 | ++ pvsSize;
|
---|
2511 | }
|
---|
2512 | }
|
---|
2513 | if (ray->sourceObject.mObject)
|
---|
2514 | {
|
---|
2515 | if (!ray->sourceObject.mObject->Mailed())
|
---|
2516 | {
|
---|
2517 | ray->sourceObject.mObject->Mail();
|
---|
2518 | ++ pvsSize;
|
---|
2519 | }
|
---|
2520 | }
|
---|
2521 | }
|
---|
2522 |
|
---|
2523 | return pvsSize;
|
---|
2524 | }
|
---|
2525 |
|
---|
2526 | float BspTree::GetEpsilon() const
|
---|
2527 | {
|
---|
2528 | return mEpsilon;
|
---|
2529 | }
|
---|
2530 |
|
---|
2531 |
|
---|
2532 | /*************************************************************/
|
---|
2533 | /* BspNodeGeometry Implementation */
|
---|
2534 | /*************************************************************/
|
---|
2535 |
|
---|
2536 | BspNodeGeometry::~BspNodeGeometry()
|
---|
2537 | {
|
---|
2538 | CLEAR_CONTAINER(mPolys);
|
---|
2539 | }
|
---|
2540 |
|
---|
2541 | float BspNodeGeometry::GetArea() const
|
---|
2542 | {
|
---|
2543 | return Polygon3::GetArea(mPolys);
|
---|
2544 | }
|
---|
2545 |
|
---|
2546 | void BspNodeGeometry::SplitGeometry(BspNodeGeometry &front,
|
---|
2547 | BspNodeGeometry &back,
|
---|
2548 | const Plane3 &splitPlane,
|
---|
2549 | const AxisAlignedBox3 &box,
|
---|
2550 | const float epsilon) const
|
---|
2551 | {
|
---|
2552 | // get cross section of new polygon
|
---|
2553 | Polygon3 *planePoly = box.CrossSection(splitPlane);
|
---|
2554 |
|
---|
2555 | // split polygon with all other polygons
|
---|
2556 | planePoly = SplitPolygon(planePoly, epsilon);
|
---|
2557 |
|
---|
2558 | //-- new polygon splits all other polygons
|
---|
2559 | for (int i = 0; i < (int)mPolys.size(); ++ i)
|
---|
2560 | {
|
---|
2561 | /// don't use epsilon here to get exact split planes
|
---|
2562 | const int cf =
|
---|
2563 | mPolys[i]->ClassifyPlane(splitPlane, Limits::Small);
|
---|
2564 |
|
---|
2565 | switch (cf)
|
---|
2566 | {
|
---|
2567 | case Polygon3::SPLIT:
|
---|
2568 | {
|
---|
2569 | Polygon3 *poly = new Polygon3(mPolys[i]->mVertices);
|
---|
2570 |
|
---|
2571 | Polygon3 *frontPoly = new Polygon3();
|
---|
2572 | Polygon3 *backPoly = new Polygon3();
|
---|
2573 |
|
---|
2574 | poly->Split(splitPlane,
|
---|
2575 | *frontPoly,
|
---|
2576 | *backPoly,
|
---|
2577 | epsilon);
|
---|
2578 |
|
---|
2579 | DEL_PTR(poly);
|
---|
2580 |
|
---|
2581 | if (frontPoly->Valid(epsilon))
|
---|
2582 | front.mPolys.push_back(frontPoly);
|
---|
2583 | else
|
---|
2584 | DEL_PTR(frontPoly);
|
---|
2585 |
|
---|
2586 | if (backPoly->Valid(epsilon))
|
---|
2587 | back.mPolys.push_back(backPoly);
|
---|
2588 | else
|
---|
2589 | DEL_PTR(backPoly);
|
---|
2590 | }
|
---|
2591 |
|
---|
2592 | break;
|
---|
2593 | case Polygon3::BACK_SIDE:
|
---|
2594 | back.mPolys.push_back(new Polygon3(mPolys[i]->mVertices));
|
---|
2595 | break;
|
---|
2596 | case Polygon3::FRONT_SIDE:
|
---|
2597 | front.mPolys.push_back(new Polygon3(mPolys[i]->mVertices));
|
---|
2598 | break;
|
---|
2599 | case Polygon3::COINCIDENT:
|
---|
2600 | //front.mPolys.push_back(CreateReversePolygon(mPolys[i]));
|
---|
2601 | back.mPolys.push_back(new Polygon3(mPolys[i]->mVertices));
|
---|
2602 | break;
|
---|
2603 | default:
|
---|
2604 | break;
|
---|
2605 | }
|
---|
2606 | }
|
---|
2607 |
|
---|
2608 | //-- finally add the new polygon to the child node geometries
|
---|
2609 | if (planePoly)
|
---|
2610 | {
|
---|
2611 | // add polygon with normal pointing into positive half space to back cell
|
---|
2612 | back.mPolys.push_back(planePoly);
|
---|
2613 | // add polygon with reverse orientation to front cell
|
---|
2614 | front.mPolys.push_back(planePoly->CreateReversePolygon());
|
---|
2615 | }
|
---|
2616 |
|
---|
2617 | //Debug << "returning new geometry " << mPolys.size() << " f: " << front.mPolys.size() << " b: " << back.mPolys.size() << endl;
|
---|
2618 | //Debug << "old area " << GetArea() << " f: " << front.GetArea() << " b: " << back.GetArea() << endl;
|
---|
2619 | }
|
---|
2620 |
|
---|
2621 | Polygon3 *BspNodeGeometry::SplitPolygon(Polygon3 *planePoly,
|
---|
2622 | const float epsilon) const
|
---|
2623 | {
|
---|
2624 | if (!planePoly->Valid(epsilon))
|
---|
2625 | DEL_PTR(planePoly);
|
---|
2626 |
|
---|
2627 | // polygon is split by all other planes
|
---|
2628 | for (int i = 0; (i < (int)mPolys.size()) && planePoly; ++ i)
|
---|
2629 | {
|
---|
2630 | Plane3 plane = mPolys[i]->GetSupportingPlane();
|
---|
2631 |
|
---|
2632 | /// don't use epsilon here to get exact split planes
|
---|
2633 | const int cf =
|
---|
2634 | planePoly->ClassifyPlane(plane, Limits::Small);
|
---|
2635 |
|
---|
2636 | // split new polygon with all previous planes
|
---|
2637 | switch (cf)
|
---|
2638 | {
|
---|
2639 | case Polygon3::SPLIT:
|
---|
2640 | {
|
---|
2641 | Polygon3 *frontPoly = new Polygon3();
|
---|
2642 | Polygon3 *backPoly = new Polygon3();
|
---|
2643 |
|
---|
2644 | planePoly->Split(plane,
|
---|
2645 | *frontPoly,
|
---|
2646 | *backPoly,
|
---|
2647 | epsilon);
|
---|
2648 |
|
---|
2649 | // don't need anymore
|
---|
2650 | DEL_PTR(planePoly);
|
---|
2651 | DEL_PTR(frontPoly);
|
---|
2652 |
|
---|
2653 | // back polygon is belonging to geometry
|
---|
2654 | if (backPoly->Valid(epsilon))
|
---|
2655 | planePoly = backPoly;
|
---|
2656 | else
|
---|
2657 | DEL_PTR(backPoly);
|
---|
2658 | }
|
---|
2659 | break;
|
---|
2660 | case Polygon3::FRONT_SIDE:
|
---|
2661 | DEL_PTR(planePoly);
|
---|
2662 | break;
|
---|
2663 | // polygon is taken as it is
|
---|
2664 | case Polygon3::BACK_SIDE:
|
---|
2665 | case Polygon3::COINCIDENT:
|
---|
2666 | default:
|
---|
2667 | break;
|
---|
2668 | }
|
---|
2669 | }
|
---|
2670 |
|
---|
2671 | return planePoly;
|
---|
2672 | }
|
---|
2673 |
|
---|
2674 |
|
---|
2675 | ViewCell *
|
---|
2676 | BspTree::GetViewCell(const Vector3 &point)
|
---|
2677 | {
|
---|
2678 | if (mRoot == NULL)
|
---|
2679 | return NULL;
|
---|
2680 |
|
---|
2681 |
|
---|
2682 | stack<BspNode *> nodeStack;
|
---|
2683 | nodeStack.push(mRoot);
|
---|
2684 |
|
---|
2685 | ViewCell *viewcell = NULL;
|
---|
2686 |
|
---|
2687 | while (!nodeStack.empty()) {
|
---|
2688 | BspNode *node = nodeStack.top();
|
---|
2689 | nodeStack.pop();
|
---|
2690 |
|
---|
2691 | if (node->IsLeaf()) {
|
---|
2692 | viewcell = dynamic_cast<BspLeaf *>(node)->mViewCell;
|
---|
2693 | break;
|
---|
2694 | } else {
|
---|
2695 |
|
---|
2696 | BspInterior *interior = dynamic_cast<BspInterior *>(node);
|
---|
2697 |
|
---|
2698 | // random decision
|
---|
2699 | if (interior->GetPlane().Side(point) < 0)
|
---|
2700 | nodeStack.push(interior->GetBack());
|
---|
2701 | else
|
---|
2702 | nodeStack.push(interior->GetFront());
|
---|
2703 | }
|
---|
2704 | }
|
---|
2705 |
|
---|
2706 | return viewcell;
|
---|
2707 | }
|
---|
2708 |
|
---|
2709 | void BspNodeGeometry::ComputeBoundingBox(AxisAlignedBox3 &box)
|
---|
2710 | {
|
---|
2711 | Polygon3::IncludeInBox(mPolys, box);
|
---|
2712 | }
|
---|