1 | #include "SceneGraph.h"
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2 | #include "KdTree.h"
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3 | #include "VssPreprocessor.h"
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4 | #include "X3dExporter.h"
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5 | #include "Environment.h"
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6 | #include "MutualVisibility.h"
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7 | #include "Polygon3.h"
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8 | #include "ViewCell.h"
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9 | #include "VssRay.h"
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10 | #include "VssTree.h"
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11 | #include "ViewCellsManager.h"
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12 | #include "RenderSimulator.h"
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13 |
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14 | bool useViewSpaceBox = true;//true;
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15 | bool use2dSampling = false;
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16 | bool useViewspacePlane = true;//true;
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17 |
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18 | VssPreprocessor::VssPreprocessor():
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19 | mPass(0),
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20 | mVssRays()
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21 | {
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22 | // this should increase coherence of the samples
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23 | environment->GetIntValue("VssPreprocessor.samplesPerPass", mSamplesPerPass);
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24 | environment->GetIntValue("VssPreprocessor.initialSamples", mInitialSamples);
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25 | environment->GetIntValue("VssPreprocessor.vssSamples", mVssSamples);
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26 | environment->GetIntValue("VssPreprocessor.vssSamplesPerPass", mVssSamplesPerPass);
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27 | environment->GetBoolValue("VssPreprocessor.useImportanceSampling", mUseImportanceSampling);
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28 | environment->GetIntValue("BspTree.Construction.samples", mBspConstructionSamples);
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29 |
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30 | mStats.open("stats.log");
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31 | }
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32 |
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33 | VssPreprocessor::~VssPreprocessor()
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34 | {
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35 | CLEAR_CONTAINER(mVssRays);
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36 | }
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37 |
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38 | void
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39 | VssPreprocessor::SetupRay(Ray &ray,
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40 | const Vector3 &point,
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41 | const Vector3 &direction
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42 | )
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43 | {
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44 | ray.Clear();
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45 | // do not store anything else then intersections at the ray
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46 | ray.Init(point, direction, Ray::LOCAL_RAY);
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47 | }
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48 |
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49 | int
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50 | VssPreprocessor::CastRay(
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51 | Vector3 &viewPoint,
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52 | Vector3 &direction,
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53 | VssRayContainer &vssRays
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54 | )
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55 | {
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56 | int hits = 0;
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57 | static Ray ray;
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58 | AxisAlignedBox3 box = mKdTree->GetBox();
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59 |
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60 | AxisAlignedBox3 sbox = box;
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61 | sbox.Enlarge(Vector3(-Limits::Small));
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62 | if (!sbox.IsInside(viewPoint))
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63 | return 0;
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64 |
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65 | SetupRay(ray, viewPoint, direction);
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66 | // cast ray to KD tree to find intersection with other objects
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67 | Intersectable *objectA, *objectB;
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68 | Vector3 pointA, pointB;
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69 | float bsize = Magnitude(box.Size());
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70 | if (mKdTree->CastRay(ray)) {
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71 | objectA = ray.intersections[0].mObject;
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72 | pointA = ray.Extrap(ray.intersections[0].mT);
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73 | } else {
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74 | objectA = NULL;
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75 | // compute intersection with the scene bounding box
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76 | float tmin, tmax;
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77 | box.ComputeMinMaxT(ray, &tmin, &tmax);
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78 | if (tmax > bsize) {
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79 | // cerr<<"Warning: tmax > box size tmax="<<tmax<<" tmin="<<tmin<<" size="<<bsize<<endl;
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80 | // cerr<<"ray"<<ray<<endl;
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81 | }
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82 | pointA = ray.Extrap(tmax);
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83 |
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84 | }
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85 |
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86 | bool detectEmptyViewSpace = true;
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87 |
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88 | if (detectEmptyViewSpace) {
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89 | SetupRay(ray, pointA, -direction);
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90 | } else
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91 | SetupRay(ray, viewPoint, -direction);
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92 |
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93 |
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94 | if (mKdTree->CastRay(ray)) {
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95 |
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96 | objectB = ray.intersections[0].mObject;
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97 | pointB = ray.Extrap(ray.intersections[0].mT);
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98 |
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99 | } else {
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100 | objectB = NULL;
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101 | float tmin, tmax;
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102 | box.ComputeMinMaxT(ray, &tmin, &tmax);
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103 | if (tmax > bsize) {
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104 | // cerr<<"Warning: tmax > box size tmax="<<tmax<<" tmin="<<tmin<<" size="<<bsize<<endl;
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105 | // cerr<<"ray"<<ray<<endl;
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106 | }
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107 |
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108 | pointB = ray.Extrap(tmax);
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109 | }
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110 |
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111 | VssRay *vssRay = NULL;
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112 |
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113 | bool validSample = true;
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114 | if (detectEmptyViewSpace) {
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115 | if (Distance(pointA, pointB) <
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116 | Distance(viewPoint, pointA) + Distance(viewPoint, pointB) - Limits::Small) {
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117 | validSample = false;
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118 | }
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119 | }
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120 |
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121 | if (validSample) {
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122 | if (objectA) {
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123 | vssRay = new VssRay(pointB,
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124 | pointA,
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125 | objectB,
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126 | objectA);
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127 | vssRays.push_back(vssRay);
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128 | hits ++;
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129 | }
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130 |
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131 | if (objectB) {
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132 | vssRay = new VssRay(pointA,
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133 | pointB,
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134 | objectA,
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135 | objectB);
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136 | vssRays.push_back(vssRay);
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137 | hits ++;
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138 | }
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139 | }
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140 |
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141 | return hits;
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142 | }
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143 |
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144 |
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145 | Vector3
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146 | VssPreprocessor::GetViewpoint(AxisAlignedBox3 *viewSpaceBox)
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147 | {
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148 | AxisAlignedBox3 box;
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149 |
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150 | if (viewSpaceBox)
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151 | box =*viewSpaceBox;
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152 | else
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153 | box = mKdTree->GetBox();
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154 |
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155 | // shrink the box in the y direction
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156 | return box.GetRandomPoint();
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157 | }
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158 |
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159 | Vector3
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160 | VssPreprocessor::GetDirection(const Vector3 &viewpoint,
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161 | AxisAlignedBox3 *viewSpaceBox
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162 | )
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163 | {
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164 | Vector3 point;
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165 | if (!use2dSampling) {
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166 | Vector3 normal;
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167 | int i = RandomValue(0, mObjects.size()-1);
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168 | Intersectable *object = mObjects[i];
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169 | object->GetRandomSurfacePoint(point, normal);
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170 | } else {
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171 | AxisAlignedBox3 box;
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172 |
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173 | if (viewSpaceBox)
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174 | box =*viewSpaceBox;
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175 | else
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176 | box = mKdTree->GetBox();
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177 |
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178 | point = box.GetRandomPoint();
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179 | point.y = viewpoint.y;
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180 | }
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181 |
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182 | return point - viewpoint;
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183 | }
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184 |
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185 | int
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186 | VssPreprocessor::GenerateImportanceRays(VssTree *vssTree,
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187 | const int desiredSamples,
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188 | SimpleRayContainer &rays
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189 | )
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190 | {
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191 | int num;
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192 | if (0) {
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193 | float minRayContribution;
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194 | float maxRayContribution;
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195 | float avgRayContribution;
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196 |
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197 | vssTree->GetRayContributionStatistics(minRayContribution,
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198 | maxRayContribution,
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199 | avgRayContribution);
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200 |
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201 | cout<<
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202 | "#MIN_RAY_CONTRIB\n"<<minRayContribution<<endl<<
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203 | "#MAX_RAY_CONTRIB\n"<<maxRayContribution<<endl<<
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204 | "#AVG_RAY_CONTRIB\n"<<avgRayContribution<<endl;
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205 |
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206 | float p = desiredSamples/(float)(avgRayContribution*vssTree->stat.Leaves());
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207 | num = vssTree->GenerateRays(p, rays);
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208 | } else {
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209 | int leaves = vssTree->stat.Leaves()/2;
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210 | num = vssTree->GenerateRays(desiredSamples, leaves, rays);
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211 | }
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212 |
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213 | cout<<"Generated "<<num<<" rays."<<endl;
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214 |
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215 | return num;
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216 | }
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217 |
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218 |
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219 | bool
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220 | VssPreprocessor::ExportRays(const char *filename,
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221 | const VssRayContainer &vssRays,
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222 | const int number
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223 | )
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224 | {
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225 | cout<<"Exporting vss rays..."<<endl<<flush;
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226 |
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227 | float prob = number/(float)vssRays.size();
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228 |
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229 |
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230 | Exporter *exporter = NULL;
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231 | exporter = Exporter::GetExporter(filename);
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232 | // exporter->SetWireframe();
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233 | // exporter->ExportKdTree(*mKdTree);
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234 | exporter->SetFilled();
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235 | exporter->ExportScene(mSceneGraph->mRoot);
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236 | exporter->SetWireframe();
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237 |
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238 | if (mViewSpaceBox) {
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239 | exporter->SetForcedMaterial(RgbColor(1,0,1));
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240 | exporter->ExportBox(*mViewSpaceBox);
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241 | exporter->ResetForcedMaterial();
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242 | }
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243 |
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244 | VssRayContainer rays; for (int i=0; i < vssRays.size(); i++)
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245 | if (RandomValue(0,1) < prob)
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246 | rays.push_back(vssRays[i]);
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247 |
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248 | exporter->ExportRays(rays, RgbColor(1, 0, 0));
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249 |
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250 | delete exporter;
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251 |
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252 | cout<<"done."<<endl<<flush;
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253 |
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254 | return true;
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255 | }
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256 |
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257 |
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258 | bool
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259 | VssPreprocessor::ExportVssTree(char *filename,
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260 | VssTree *tree,
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261 | const Vector3 &dir
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262 | )
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263 | {
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264 | Exporter *exporter = Exporter::GetExporter(filename);
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265 | exporter->SetFilled();
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266 | exporter->ExportScene(mSceneGraph->mRoot);
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267 | // exporter->SetWireframe();
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268 | bool result = exporter->ExportVssTree2( *tree, dir );
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269 | delete exporter;
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270 | return result;
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271 | }
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272 |
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273 | bool
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274 | VssPreprocessor::ExportVssTreeLeaf(char *filename,
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275 | VssTree *tree,
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276 | VssTreeLeaf *leaf)
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277 | {
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278 | Exporter *exporter = NULL;
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279 | exporter = Exporter::GetExporter(filename);
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280 | exporter->SetWireframe();
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281 | exporter->ExportKdTree(*mKdTree);
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282 |
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283 | if (mViewSpaceBox) {
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284 | exporter->SetForcedMaterial(RgbColor(1,0,0));
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285 | exporter->ExportBox(*mViewSpaceBox);
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286 | exporter->ResetForcedMaterial();
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287 | }
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288 |
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289 | exporter->SetForcedMaterial(RgbColor(0,0,1));
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290 | exporter->ExportBox(tree->GetBBox(leaf));
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291 | exporter->ResetForcedMaterial();
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292 |
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293 | VssRayContainer rays[4];
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294 | for (int i=0; i < leaf->rays.size(); i++) {
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295 | int k = leaf->rays[i].GetRayClass();
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296 | rays[k].push_back(leaf->rays[i].mRay);
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297 | }
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298 |
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299 | // SOURCE RAY
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300 | exporter->ExportRays(rays[0], RgbColor(1, 0, 0));
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301 | // TERMINATION RAY
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302 | exporter->ExportRays(rays[1], RgbColor(1, 1, 1));
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303 | // PASSING_RAY
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304 | exporter->ExportRays(rays[2], RgbColor(1, 1, 0));
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305 | // CONTAINED_RAY
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306 | exporter->ExportRays(rays[3], RgbColor(0, 0, 1));
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307 |
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308 | delete exporter;
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309 | return true;
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310 | }
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311 |
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312 | void
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313 | VssPreprocessor::ExportVssTreeLeaves(VssTree *tree, const int number)
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314 | {
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315 | vector<VssTreeLeaf *> leaves;
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316 | tree->CollectLeaves(leaves);
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317 |
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318 | int num = 0;
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319 | int i;
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320 | float p = number / (float)leaves.size();
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321 | for (i=0; i < leaves.size(); i++) {
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322 | if (RandomValue(0,1) < p) {
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323 | char filename[64];
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324 | sprintf(filename, "vss-leaf-%04d.x3d", num);
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325 | ExportVssTreeLeaf(filename, tree, leaves[i]);
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326 | num++;
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327 | }
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328 | if (num >= number)
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329 | break;
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330 | }
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331 | }
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332 |
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333 |
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334 | float
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335 | VssPreprocessor::GetAvgPvsSize(VssTree *tree,
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336 | const vector<AxisAlignedBox3> &viewcells
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337 | )
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338 | {
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339 | vector<AxisAlignedBox3>::const_iterator it, it_end = viewcells.end();
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340 |
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341 | int sum = 0;
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342 | for (it = viewcells.begin(); it != it_end; ++ it)
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343 | sum += tree->GetPvsSize(*it);
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344 |
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345 | return sum/(float)viewcells.size();
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346 | }
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347 |
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348 | bool
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349 | VssPreprocessor::ComputeVisibility()
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350 | {
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351 |
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352 | mSceneGraph->CollectObjects(&mObjects);
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353 |
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354 | long startTime = GetTime();
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355 |
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356 | int totalSamples = 0;
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357 |
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358 |
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359 | AxisAlignedBox3 *box = new AxisAlignedBox3(mKdTree->GetBox());
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360 |
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361 | if (!useViewspacePlane) {
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362 | float size = 0.05f;
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363 | float s = 0.5f - size;
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364 | float olds = Magnitude(box->Size());
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365 | box->Enlarge(box->Size()*Vector3(-s));
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366 | Vector3 translation = Vector3(-olds*0.1f, 0, 0);
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367 | box->SetMin(box->Min() + translation);
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368 | box->SetMax(box->Max() + translation);
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369 | } else {
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370 |
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371 | // sample city like heights
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372 | box->SetMin(1, box->Min(1) + box->Size(1)*0.2);
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373 | box->SetMax(1, box->Min(1) + box->Size(1)*0.3);
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374 | }
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375 |
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376 | if (use2dSampling)
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377 | box->SetMax(1, box->Min(1));
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378 |
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379 | if (useViewSpaceBox)
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380 | mViewSpaceBox = box;
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381 | else
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382 | mViewSpaceBox = NULL;
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383 |
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384 |
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385 | VssTree *vssTree = NULL;
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386 |
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387 | while (totalSamples < mInitialSamples) {
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388 | int passContributingSamples = 0;
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389 | int passSampleContributions = 0;
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390 | int passSamples = 0;
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391 | int index = 0;
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392 |
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393 | int sampleContributions;
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394 |
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395 | int s = Min(mSamplesPerPass, mInitialSamples);
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396 | for (int k=0; k < s; k++) {
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397 |
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398 | Vector3 viewpoint = GetViewpoint(mViewSpaceBox);
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399 | Vector3 direction = GetDirection(viewpoint, mViewSpaceBox);
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400 |
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401 | sampleContributions = CastRay(viewpoint, direction, mVssRays);
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402 |
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403 |
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404 | //-- CORR matt: put block inside loop
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405 | if (sampleContributions) {
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406 | passContributingSamples ++;
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407 | passSampleContributions += sampleContributions;
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408 | }
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409 | passSamples++;
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410 | totalSamples++;
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411 | }
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412 |
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413 | mPass++;
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414 |
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415 | int pvsSize = 0;
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416 | float avgRayContrib = (passContributingSamples > 0) ?
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417 | passSampleContributions/(float)passContributingSamples : 0;
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418 |
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419 | cout << "#Pass " << mPass << " : t = " << TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
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420 | cout << "#TotalSamples=" << totalSamples/1000
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421 | << "k #SampleContributions=" << passSampleContributions << " ("
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422 | << 100*passContributingSamples/(float)passSamples<<"%)" << " avgPVS="
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423 | << pvsSize/(float)mObjects.size() << endl
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424 | << "avg ray contrib=" << avgRayContrib << endl;
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425 |
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426 | mStats <<
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427 | "#Pass\n" <<mPass<<endl<<
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428 | "#Time\n" << TimeDiff(startTime, GetTime())*1e-3 << endl<<
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429 | "#TotalSamples\n" << totalSamples<< endl<<
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430 | "#SampleContributions\n" << passSampleContributions << endl <<
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431 | "#PContributingSamples\n"<<100*passContributingSamples/(float)passSamples<<endl <<
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432 | "#AvgPVS\n"<< pvsSize/(float)mObjects.size() << endl <<
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433 | "#AvgRayContrib\n" << avgRayContrib << endl;
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434 |
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435 |
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436 |
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437 |
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438 | }
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439 |
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440 | cout << "#totalPvsSize=" << mKdTree->CollectLeafPvs() << endl;
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441 | cout << "#totalRayStackSize=" << mVssRays.size() << endl <<flush;
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442 |
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443 | //int numExportRays = 10000;
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444 | int numExportRays = 0;
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445 |
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446 | if (numExportRays) {
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447 | char filename[64];
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448 | sprintf(filename, "vss-rays-initial.x3d");
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449 | ExportRays(filename, mVssRays, numExportRays);
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450 | }
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451 |
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452 | mSceneGraph->CollectObjects(&mObjects);
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453 |
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454 | // construct view cells
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455 | mViewCellsManager->Construct(mObjects, mVssRays, mViewSpaceBox);
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456 |
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457 | vssTree = new VssTree;
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458 | // viewcells = Construct(mVssRays);
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459 |
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460 | vssTree->Construct(mVssRays, mViewSpaceBox);
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461 | cout<<"VssTree root PVS size = "<<vssTree->GetRootPvsSize()<<endl;
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462 |
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463 | if (0)
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464 | {
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465 | ExportVssTree("vss-tree-100.x3d", vssTree, Vector3(1,0,0));
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466 | ExportVssTree("vss-tree-001.x3d", vssTree, Vector3(0,0,1));
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467 | ExportVssTree("vss-tree-101.x3d", vssTree, Vector3(1,0,1));
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468 | ExportVssTree("vss-tree-101m.x3d", vssTree, Vector3(-1,0,-1));
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469 | ExportVssTreeLeaves(vssTree, 10);
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470 | }
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471 |
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472 | // viewcells->UpdatePVS(newVssRays);
|
---|
473 | // get viewcells as kd tree boxes
|
---|
474 | vector<AxisAlignedBox3> kdViewcells;
|
---|
475 | if (0) {
|
---|
476 | vector<KdLeaf *> leaves;
|
---|
477 | mKdTree->CollectLeaves(leaves);
|
---|
478 | vector<KdLeaf *>::const_iterator it;
|
---|
479 | int targetLeaves = 50;
|
---|
480 | float prob = targetLeaves/(float)leaves.size();
|
---|
481 | for (it = leaves.begin(); it != leaves.end(); ++it)
|
---|
482 | if (RandomValue(0.0f,1.0f) < prob)
|
---|
483 | kdViewcells.push_back(mKdTree->GetBox(*it));
|
---|
484 |
|
---|
485 | float avgPvs = GetAvgPvsSize(vssTree, kdViewcells);
|
---|
486 | cout<<"Initial average PVS size = "<<avgPvs<<endl;
|
---|
487 | }
|
---|
488 |
|
---|
489 |
|
---|
490 | int samples = 0;
|
---|
491 | int pass = 0;
|
---|
492 |
|
---|
493 | /// Rays used for post processing and visualizations
|
---|
494 | RayContainer storedRays;
|
---|
495 | // cast view cell samples
|
---|
496 | while (1) {
|
---|
497 | int num = mVssSamplesPerPass;
|
---|
498 | SimpleRayContainer rays;
|
---|
499 | VssRayContainer vssRays;
|
---|
500 |
|
---|
501 | if (!mUseImportanceSampling) {
|
---|
502 | for (int j=0; j < num; j++) {
|
---|
503 | Vector3 viewpoint = GetViewpoint(mViewSpaceBox);
|
---|
504 | Vector3 direction = GetDirection(viewpoint, mViewSpaceBox);
|
---|
505 | rays.push_back(SimpleRay(viewpoint, direction));
|
---|
506 | }
|
---|
507 | } else {
|
---|
508 | num = GenerateImportanceRays(vssTree, num, rays);
|
---|
509 | }
|
---|
510 |
|
---|
511 | for (int i=0; i < rays.size(); i++)
|
---|
512 | CastRay(rays[i].mOrigin, rays[i].mDirection, vssRays);
|
---|
513 |
|
---|
514 | vssTree->AddRays(vssRays);
|
---|
515 |
|
---|
516 | if (0) {
|
---|
517 | int subdivided = vssTree->UpdateSubdivision();
|
---|
518 | cout<<"subdivided leafs = "<<subdivided<<endl;
|
---|
519 | }
|
---|
520 |
|
---|
521 | float avgPvs = GetAvgPvsSize(vssTree, kdViewcells);
|
---|
522 | cout<<"Average PVS size = "<<avgPvs<<endl;
|
---|
523 |
|
---|
524 | if (numExportRays) {
|
---|
525 | char filename[64];
|
---|
526 | if (mUseImportanceSampling)
|
---|
527 | sprintf(filename, "vss-rays-i%04d.x3d", pass);
|
---|
528 | else
|
---|
529 | sprintf(filename, "vss-rays-%04d.x3d", pass);
|
---|
530 |
|
---|
531 | ExportRays(filename, vssRays, numExportRays);
|
---|
532 | }
|
---|
533 |
|
---|
534 | //-- prepare traversal rays for view cell intersections
|
---|
535 | /// compute view cell contribution of rays
|
---|
536 | mViewCellsManager->ComputeSampleContributions(vssRays);
|
---|
537 |
|
---|
538 | samples+=num;
|
---|
539 | float pvs = vssTree->GetAvgPvsSize();
|
---|
540 | cout<<"*****************************\n";
|
---|
541 | cout<<samples<<" avgPVS ="<<pvs<<endl;
|
---|
542 | cout<<"VssTree root PVS size = "<<vssTree->GetRootPvsSize()<<endl;
|
---|
543 | cout<<"*****************************\n";
|
---|
544 | if (samples >= mVssSamples)
|
---|
545 | break;
|
---|
546 | pass++;
|
---|
547 | }
|
---|
548 |
|
---|
549 | {
|
---|
550 | VssRayContainer storedRays;
|
---|
551 | vssTree->CollectRays(storedRays, Max(
|
---|
552 | mViewCellsManager->GetPostProcessSamples(),
|
---|
553 | mViewCellsManager->GetVisualizationSamples()));
|
---|
554 |
|
---|
555 | //-- post process view cells
|
---|
556 | mViewCellsManager->PostProcess(mObjects, storedRays);
|
---|
557 |
|
---|
558 | //-- several visualizations and statistics
|
---|
559 | mViewCellsManager->PrintStatistics(Debug);
|
---|
560 |
|
---|
561 | mViewCellsManager->Visualize(mObjects, storedRays);
|
---|
562 |
|
---|
563 | CLEAR_CONTAINER(storedRays);
|
---|
564 | }
|
---|
565 |
|
---|
566 | //-- render simulation after merge
|
---|
567 | cout << "\nevaluating bsp view cells render time after merge ... ";
|
---|
568 |
|
---|
569 | const SimulationStatistics ss = mViewCellsManager->SimulateRendering();
|
---|
570 |
|
---|
571 | cout << " finished" << endl;
|
---|
572 | cout << ss << endl;
|
---|
573 | Debug << ss << endl;
|
---|
574 |
|
---|
575 |
|
---|
576 | delete vssTree;
|
---|
577 |
|
---|
578 | return true;
|
---|
579 | }
|
---|