1 | #include "RayCaster.h"
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2 | #include "VssRay.h"
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3 | #include "Ray.h"
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4 | #include "Preprocessor.h"
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5 | #include "ViewCellsManager.h"
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6 |
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7 |
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8 | namespace GtpVisibilityPreprocessor {
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9 |
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10 |
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11 | #define DEBUG_RAYCAST 0
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12 |
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13 | #define EXACT_BOX_CLIPPING 0
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14 |
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15 | RayCaster::RayCaster(const Preprocessor &preprocessor):
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16 | mPreprocessor(preprocessor)
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17 | {
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18 | }
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19 |
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20 |
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21 | RayCaster::~RayCaster()
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22 | {
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23 | }
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24 |
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25 |
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26 | VssRay *RayCaster::CastRay(const SimpleRay &simpleRay,
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27 | const AxisAlignedBox3 &box,
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28 | const bool castDoubleRay)
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29 | {
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30 | VssRayContainer rays;
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31 | CastRay(simpleRay, rays, box, castDoubleRay, true);
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32 |
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33 | if (!rays.empty())
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34 | return rays.back();
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35 | else
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36 | return NULL;
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37 | }
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38 |
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39 |
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40 | bool
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41 | RayCaster::ClipToViewSpaceBox(const Vector3 &origin,
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42 | const Vector3 &termination,
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43 | Vector3 &clippedOrigin,
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44 | Vector3 &clippedTermination)
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45 | {
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46 |
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47 | Ray ray(origin, termination - origin, Ray::LINE_SEGMENT);
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48 | ray.Precompute();
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49 |
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50 | float tmin, tmax;
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51 | if ((!mPreprocessor.mViewCellsManager->
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52 | GetViewSpaceBox().ComputeMinMaxT(ray, &tmin, &tmax)) ||
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53 | tmin>=tmax
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54 | )
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55 | return false;
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56 |
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57 | if (tmin >= 1.0f || tmax <=0.0f)
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58 | return false;
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59 |
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60 | if (tmin > 0.0f)
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61 | clippedOrigin = ray.Extrap(tmin);
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62 | else
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63 | clippedOrigin = origin;
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64 |
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65 | if (tmax < 1.0f)
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66 | clippedTermination = ray.Extrap(tmax);
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67 | else
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68 | clippedTermination = termination;
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69 |
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70 | return true;
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71 | }
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72 |
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73 | /** Checks if ray is valid, (e.g., not in empty view space or outside the view space)
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74 | */
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75 | bool
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76 | RayCaster::ValidateRay(const Vector3 &origin,
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77 | const Vector3 &direction,
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78 | const AxisAlignedBox3 &box,
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79 | Intersection &hit)
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80 | {
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81 | if (!hit.mObject)
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82 | {
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83 | // compute intersection with the scene bounding box
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84 | #if EXACT_BOX_CLIPPING
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85 | static Ray ray;
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86 | mPreprocessor.SetupRay(ray, origin, direction);
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87 |
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88 | float tmin, tmax;
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89 | if (box.ComputeMinMaxT(ray, &tmin, &tmax) && (tmin < tmax))
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90 | {
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91 | hit.mPoint = ray.Extrap(tmax);
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92 | }
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93 | else
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94 | {
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95 | // cout<<" invalid hp "<<tmin<<" "<<tmax<<endl;
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96 | // cout<<" box "<<box<<endl;
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97 | // cout<<" origin "<<origin<<endl;
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98 | // cout<<" direction "<<direction<<endl;
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99 | // cout<< "inv dir"<<ray.GetInvDir()<<endl;
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100 | return false;
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101 | }
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102 | #else
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103 | hit.mPoint = origin + direction * Magnitude(box.Diagonal());
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104 | #endif
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105 | }
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106 | else
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107 | {
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108 | if (mPreprocessor.mDetectEmptyViewSpace) {
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109 | if (DotProd(hit.mNormal, direction) >= -Limits::Small) {
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110 | hit.mObject = NULL;
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111 | return false;
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112 | }
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113 | }
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114 | }
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115 |
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116 | return true;
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117 | }
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118 |
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119 | void
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120 | RayCaster::SortRays(SimpleRayContainer &rays)
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121 | {
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122 | AxisAlignedBox3 box =
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123 | mPreprocessor.mViewCellsManager->GetViewSpaceBox();
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124 |
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125 | float b[12]={
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126 | box.Min().x,
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127 | box.Min().y,
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128 | box.Min().z,
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129 | -1,
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130 | -1,
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131 | -1,
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132 | box.Max().x,
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133 | box.Max().y,
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134 | box.Max().z,
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135 | 1,
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136 | 1,
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137 | 1
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138 | };
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139 |
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140 | _SortRays(rays,
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141 | 0,
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142 | (int)rays.size()-1,
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143 | 0,
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144 | b
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145 | );
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146 | }
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147 |
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148 | void
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149 | RayCaster::_SortRays(SimpleRayContainer &rays,
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150 | const int l,
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151 | const int r,
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152 | const int depth,
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153 | float box[12])
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154 | {
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155 | // pick-up a pivot
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156 | int axis;
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157 |
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158 | float maxDiff = -1.0f;
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159 | // get the largest axis
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160 | int offset = 0;
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161 | int i;
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162 |
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163 | const int batchsize = 8192;
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164 |
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165 | // if (r - l < 32*batchsize)
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166 | // offset = 3;
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167 |
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168 | // if (depth%5==0)
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169 | // offset = 3;
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170 |
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171 | for (i=offset; i < offset + 3; i++) {
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172 | float diff = box[i + 6] - box[i];
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173 | if (diff > maxDiff) {
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174 | maxDiff = diff;
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175 | axis = i;
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176 | }
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177 | }
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178 |
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179 | // cout<<depth<<" "<<axis<<" "<<l<<" "<<r<<endl;
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180 |
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181 | i=l;
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182 | int j=r;
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183 |
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184 | float x = (box[axis] + box[axis+6])*0.5f;
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185 | // float x = rays[(l+r)/2].GetParam(axis);
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186 | do {
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187 | while(i<j && rays[i].GetParam(axis) < x)
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188 | i++;
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189 | while(i<j && x < rays[j].GetParam(axis))
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190 | j--;
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191 |
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192 | if (i <= j) {
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193 | swap(rays[i], rays[j]);
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194 | i++;
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195 | j--;
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196 | }
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197 | } while (i<=j);
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198 |
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199 |
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200 | if (l + batchsize < j ) {
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201 | // set new max
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202 | float save = box[axis+6];
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203 | box[axis+6] = x;
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204 | _SortRays(rays, l, j, depth+1, box);
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205 | box[axis+6] = save;
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206 | } else {
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207 | // for (int k=0; k < 6; k++)
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208 | // cout<<k<<" "<<box[k]<<" - "<<box[k+6]<<endl;
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209 | }
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210 |
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211 | if (i + batchsize < r) {
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212 | // set new min
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213 | box[axis] = x;
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214 | _SortRays(rays, i, r, depth+1, box);
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215 | } else {
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216 | // for (int k=0; k < 6; k++)
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217 | // cout<<k<<" "<<box[k]<<" - "<<box[k+6]<<endl;
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218 | }
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219 |
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220 | }
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221 |
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222 |
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223 |
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224 | int
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225 | RayCaster::ProcessRay(const SimpleRay &simpleRay,
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226 | Intersection &hitA,
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227 | Intersection &hitB,
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228 | VssRayContainer &vssRays,
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229 | const AxisAlignedBox3 &box,
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230 | const bool castDoubleRay,
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231 | const bool pruneInvalidRays)
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232 | {
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233 | int hits = 0;
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234 |
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235 |
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236 | #if DEBUG_RAYCAST
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237 | static int id=0;
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238 | Debug<<"PRA "<<id++<<endl<<flush;
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239 | #endif
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240 |
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241 | if (pruneInvalidRays)
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242 | {
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243 | if (!hitA.mObject && !hitB.mObject) {
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244 | return 0;
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245 | }
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246 | }
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247 |
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248 |
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249 | // regardless of the pruneInvalidRays setting reject rays whic degenerate to a point
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250 | if (EpsilonEqualV3(hitA.mPoint, hitB.mPoint, Limits::Small)) {
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251 | return 0;
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252 | }
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253 |
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254 |
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255 | const bool validA = ValidateRay(simpleRay.mOrigin, simpleRay.mDirection, box, hitA);
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256 | const bool validB = //castDoubleRay &&
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257 | ValidateRay(simpleRay.mOrigin, -simpleRay.mDirection, box, hitB);
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258 |
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259 |
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260 | #if DEBUG_RAYCAST
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261 | Debug<<"PR1"<<flush;
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262 | #endif
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263 |
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264 | // reset both contributions
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265 | if (!validA || !validB) {
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266 | if (pruneInvalidRays)
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267 | return 0;
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268 |
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269 | // reset both contributions of this ray
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270 | hitA.mObject = NULL;
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271 | hitB.mObject = NULL;
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272 | }
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273 |
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274 | // 8.11. 2007 JB
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275 | // degenerate rays checked by geometrical constraint...
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276 | // !pruneInvalidRays || (hitA.mObject != hitB.mObject);
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277 |
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278 |
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279 | #if DEBUG_RAYCAST
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280 | Debug<<"PR2"<<flush;
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281 | #endif
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282 | const bool validSample = true;
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283 | if (validSample) {
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284 | Vector3 clipA, clipB;
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285 | if (!ClipToViewSpaceBox(hitA.mPoint,
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286 | hitB.mPoint,
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287 | clipA,
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288 | clipB))
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289 | return 0;
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290 |
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291 | if (!pruneInvalidRays || hitA.mObject) {
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292 | #if DEBUG_RAYCAST
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293 | Debug<<"PR2a"<<flush;
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294 | #endif
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295 |
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296 | VssRay *vssRay = mVssRayPool.Alloc();
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297 |
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298 | #if DEBUG_RAYCAST
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299 | Debug<<"PR2b"<<flush;
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300 | #endif
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301 | *vssRay = VssRay(
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302 | !castDoubleRay ? simpleRay.mOrigin : clipB,
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303 | hitA.mPoint,
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304 | hitB.mObject,
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305 | hitA.mObject,
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306 | mPreprocessor.mPass,
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307 | simpleRay.mPdf
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308 | );
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309 | #if DEBUG_RAYCAST
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310 | Debug<<"PR2c"<<flush;
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311 | #endif
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312 |
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313 | if (validA)
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314 | vssRay->mFlags |= VssRay::Valid;
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315 |
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316 |
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317 | vssRay->mDistribution = simpleRay.mDistribution;
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318 | vssRay->mGeneratorId = simpleRay.mGeneratorId;
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319 |
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320 | vssRays.push_back(vssRay);
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321 | ++ hits;
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322 | //cout << "vssray 1: " << *vssRay << " " << vssRay->mTermination - vssRay->mOrigin << endl;
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323 | }
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324 |
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325 | #if DEBUG_RAYCAST
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326 | Debug<<"PR3"<<flush;
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327 | #endif
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328 |
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329 | if (castDoubleRay && (!pruneInvalidRays || hitB.mObject))
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330 | {
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331 | VssRay *vssRay = mVssRayPool.Alloc();
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332 |
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333 | *vssRay = VssRay(
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334 | clipA,
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335 | hitB.mPoint,
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336 | hitA.mObject,
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337 | hitB.mObject,
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338 | mPreprocessor.mPass,
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339 | simpleRay.mPdf
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340 | );
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341 | if (validB)
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342 | vssRay->mFlags |= VssRay::Valid;
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343 |
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344 |
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345 | vssRay->mDistribution = simpleRay.mDistribution;
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346 | vssRay->mGeneratorId = simpleRay.mGeneratorId;
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347 | vssRays.push_back(vssRay);
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348 | ++ hits;
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349 | //cout << "vssray 2: " << *vssRay << endl;
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350 | }
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351 | #if DEBUG_RAYCAST
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352 | Debug<<"PR4"<<flush;
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353 | #endif
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354 | }
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355 |
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356 | return hits;
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357 | }
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358 |
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359 | }
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