1 | #ifndef _SamplingStategy_H__
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2 | #define _SamplingStategy_H__
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3 |
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4 | #include <vector>
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5 | using namespace std;
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6 |
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7 | #include "Halton.h"
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8 |
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9 | namespace GtpVisibilityPreprocessor {
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10 |
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11 |
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12 | class Preprocessor;
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13 | struct SimpleRay;
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14 | class SimpleRayContainer;
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15 | struct VssRayContainer;
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16 |
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17 | /** This class generates a specific sampling strategy.
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18 | */
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19 | class SamplingStrategy
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20 | {
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21 | public:
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22 |
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23 | /** Sample rays of particular type
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24 | */
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25 | enum
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26 | {
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27 | DUMMY_DISTRIBUTION = 0,
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28 | DIRECTION_BASED_DISTRIBUTION,
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29 | OBJECT_BASED_DISTRIBUTION,
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30 | DIRECTION_BOX_BASED_DISTRIBUTION,
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31 | SPATIAL_BOX_BASED_DISTRIBUTION,
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32 | VSS_BASED_DISTRIBUTION,
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33 | RSS_BASED_DISTRIBUTION,
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34 | RSS_SILHOUETTE_BASED_DISTRIBUTION,
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35 | OBJECT_DIRECTION_BASED_DISTRIBUTION,
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36 | OBJECTS_INTERIOR_DISTRIBUTION,
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37 | REVERSE_OBJECT_BASED_DISTRIBUTION,
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38 | VIEWCELL_BORDER_BASED_DISTRIBUTION,
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39 | VIEWSPACE_BORDER_BASED_DISTRIBUTION,
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40 | REVERSE_VIEWSPACE_BORDER_BASED_DISTRIBUTION,
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41 | GLOBAL_LINES_DISTRIBUTION,
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42 | GVS
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43 | };
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44 |
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45 | /** Default constructor
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46 | */
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47 | SamplingStrategy(Preprocessor &preprocessor);
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48 |
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49 | virtual ~SamplingStrategy();
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50 |
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51 | /** Each strategy has to implement this function.
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52 | @returns true if generated valid sample.
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53 | */
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54 |
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55 | virtual int GenerateSamples(const int number, SimpleRayContainer &rays);
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56 |
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57 |
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58 | virtual bool GenerateSample(SimpleRay &ray) = 0;
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59 |
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60 |
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61 |
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62 | virtual void Update(VssRayContainer &vssRays) {}
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63 |
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64 |
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65 |
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66 | friend bool LowerRatio(const SamplingStrategy *a, const SamplingStrategy *b) {
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67 | return a->mRatio < b->mRatio;
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68 | }
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69 |
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70 | public:
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71 | /// variables usefull for mixed distribution sampling
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72 | int mType;
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73 | int mRays;
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74 | float mContribution;
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75 | float mTime;
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76 | float mRatio;
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77 |
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78 | int mTotalRays;
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79 | float mTotalContribution;
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80 | protected:
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81 |
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82 | Preprocessor &mPreprocessor;
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83 |
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84 | };
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85 |
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86 |
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87 | class ObjectBasedDistribution: public SamplingStrategy
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88 | {
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89 | public:
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90 | HaltonSequence mHalton;
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91 |
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92 | ObjectBasedDistribution(Preprocessor &preprocessor):
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93 | SamplingStrategy(preprocessor) {
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94 | mType = OBJECT_BASED_DISTRIBUTION;
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95 | }
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96 |
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97 | private:
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98 | virtual bool GenerateSample(SimpleRay &ray);
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99 | };
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100 |
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101 |
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102 | class ReverseObjectBasedDistribution: public SamplingStrategy
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103 | {
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104 | public:
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105 |
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106 | ReverseObjectBasedDistribution(Preprocessor &preprocessor):
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107 | SamplingStrategy(preprocessor) {
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108 | mType = REVERSE_OBJECT_BASED_DISTRIBUTION;
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109 | }
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110 |
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111 | private:
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112 | virtual bool GenerateSample(SimpleRay &ray);
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113 | };
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114 |
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115 |
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116 | class ObjectDirectionBasedDistribution: public SamplingStrategy
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117 | {
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118 | HaltonSequence mHalton;
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119 |
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120 | public:
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121 | ObjectDirectionBasedDistribution(Preprocessor &preprocessor):
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122 | SamplingStrategy(preprocessor) {
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123 | mType = OBJECT_DIRECTION_BASED_DISTRIBUTION;
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124 | }
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125 | private:
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126 | virtual bool GenerateSample(SimpleRay &ray);
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127 | };
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128 |
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129 |
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130 | class DirectionBasedDistribution: public SamplingStrategy
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131 | {
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132 | public:
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133 | DirectionBasedDistribution(Preprocessor &preprocessor):
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134 | SamplingStrategy(preprocessor){
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135 | mType = DIRECTION_BASED_DISTRIBUTION;
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136 | }
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137 | private:
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138 | virtual bool GenerateSample(SimpleRay &ray);
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139 | };
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140 |
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141 |
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142 | class DirectionBoxBasedDistribution: public SamplingStrategy
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143 | {
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144 | public:
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145 | DirectionBoxBasedDistribution(Preprocessor &preprocessor):
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146 | SamplingStrategy(preprocessor){
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147 | mType = DIRECTION_BOX_BASED_DISTRIBUTION;
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148 | }
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149 |
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150 | private:
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151 | virtual bool GenerateSample(SimpleRay &ray);
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152 | };
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153 |
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154 |
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155 | class SpatialBoxBasedDistribution: public SamplingStrategy
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156 | {
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157 | public:
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158 | HaltonSequence mHalton;
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159 | SpatialBoxBasedDistribution(Preprocessor &preprocessor):
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160 | SamplingStrategy(preprocessor){
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161 | mType = DIRECTION_BOX_BASED_DISTRIBUTION;
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162 | }
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163 |
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164 | private:
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165 | virtual bool GenerateSample(SimpleRay &ray);
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166 | };
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167 |
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168 |
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169 | class ViewSpaceBorderBasedDistribution: public SamplingStrategy
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170 | {
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171 | public:
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172 | ViewSpaceBorderBasedDistribution(Preprocessor &preprocessor):
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173 | SamplingStrategy(preprocessor){
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174 | mType = SPATIAL_BOX_BASED_DISTRIBUTION;
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175 | }
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176 |
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177 | private:
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178 | virtual bool GenerateSample(SimpleRay &ray);
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179 | };
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180 |
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181 |
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182 | class ReverseViewSpaceBorderBasedDistribution: public SamplingStrategy
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183 | {
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184 | public:
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185 | ReverseViewSpaceBorderBasedDistribution(Preprocessor &preprocessor):
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186 | SamplingStrategy(preprocessor){
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187 | mType = SPATIAL_BOX_BASED_DISTRIBUTION;
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188 | }
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189 |
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190 | private:
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191 | virtual bool GenerateSample(SimpleRay &ray);
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192 | };
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193 |
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194 |
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195 |
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196 |
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197 | class ViewCellBorderBasedDistribution: public SamplingStrategy
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198 | {
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199 | public:
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200 | ViewCellBorderBasedDistribution(Preprocessor &preprocessor):
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201 | SamplingStrategy(preprocessor) {}
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202 |
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203 | virtual bool GenerateSample(SimpleRay &ray);
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204 | };
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205 |
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206 | class GlobalLinesDistribution: public SamplingStrategy
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207 | {
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208 | public:
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209 | //Halton<4> halton;
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210 | HaltonSequence mHalton;
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211 |
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212 | GlobalLinesDistribution(Preprocessor &preprocessor):
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213 | SamplingStrategy(preprocessor) {
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214 | mType = GLOBAL_LINES_DISTRIBUTION;
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215 | }
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216 |
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217 | virtual bool GenerateSample(SimpleRay &ray);
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218 | };
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219 |
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220 |
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221 | /** This strategy generates samples inside of the objects, e.g.,
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222 | for sampling the inside of a colon.
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223 | */
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224 | /*class ObjectsInteriorDistribution: public SamplingStrategy
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225 | {
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226 | public:
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227 | ObjectsInteriorDistribution(Preprocessor &preprocessor):
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228 | SamplingStrategy(preprocessor) {}
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229 |
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230 | virtual bool GenerateSample(SimpleRay &ray);
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231 | };
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232 | */
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233 |
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234 | class MixtureDistribution : public SamplingStrategy {
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235 | public:
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236 | // halton sequence generator for deciding between distributions
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237 | HaltonSequence mHalton;
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238 |
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239 | // container for the distributions
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240 | vector<SamplingStrategy *> mDistributions;
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241 |
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242 | MixtureDistribution(Preprocessor &preprocessor):
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243 | SamplingStrategy(preprocessor)
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244 | {
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245 | }
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246 |
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247 | // has to called before first usage
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248 | void Init();
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249 |
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250 | // equalize distribution contributions
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251 | void
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252 | Reset();
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253 |
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254 | // Generate a new sample according to a mixture distribution
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255 | virtual bool GenerateSample(SimpleRay &ray);
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256 |
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257 | // add contributions of the sample to the strategies
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258 | void ComputeContributions(VssRayContainer &vssRays);
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259 |
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260 | void
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261 | UpdateRatios();
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262 |
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263 |
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264 | };
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265 |
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266 | };
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267 |
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268 | #endif
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