[1020] | 1 | #include "SamplingStrategy.h"
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| 2 | #include "Ray.h"
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| 3 | #include "Intersectable.h"
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| 4 | #include "Preprocessor.h"
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| 5 | #include "ViewCellsManager.h"
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| 6 | #include "AxisAlignedBox3.h"
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[1891] | 7 | #include "RssTree.h"
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[1989] | 8 | #include "Mutation.h"
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[2043] | 9 | #include "PerfTimer.h"
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[1020] | 10 |
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[2069] | 11 |
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[1020] | 12 | namespace GtpVisibilityPreprocessor {
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| 13 |
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[2044] | 14 | extern PerfTimer pvsTimer;
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| 15 | extern PerfTimer viewCellCastTimer;
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[2015] | 16 |
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[1901] | 17 | //HaltonSequence SamplingStrategy::sHalton;
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| 18 |
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[1899] | 19 | HaltonSequence ObjectBasedDistribution::sHalton;
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| 20 | HaltonSequence MixtureDistribution::sHalton;
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| 21 | HaltonSequence GlobalLinesDistribution::sHalton;
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| 22 | HaltonSequence SpatialBoxBasedDistribution::sHalton;
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| 23 | HaltonSequence ObjectDirectionBasedDistribution::sHalton;
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[1952] | 24 | HaltonSequence DirectionBasedDistribution::sHalton;
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[1968] | 25 | HaltonSequence HwGlobalLinesDistribution::sHalton;
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[1899] | 26 |
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[1996] | 27 | HaltonSequence ViewCellBasedDistribution::sHalton;
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[1899] | 28 |
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[1884] | 29 | SamplingStrategy::SamplingStrategy(Preprocessor &preprocessor):
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[1968] | 30 | mPreprocessor(preprocessor),
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| 31 | mRatio(1.0f),
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| 32 | mTotalRays(0),
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| 33 | mTotalContribution(0.0f)
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| 34 | {
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[1520] | 35 | }
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| 36 |
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| 37 |
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| 38 | SamplingStrategy::~SamplingStrategy()
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| 39 | {
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| 40 | }
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| 41 |
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[1771] | 42 | int
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| 43 | SamplingStrategy::GenerateSamples(const int number,
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[1867] | 44 | SimpleRayContainer &rays)
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[1771] | 45 | {
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[1772] | 46 | SimpleRay ray;
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| 47 | int samples = 0;
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| 48 | int i = 0;
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| 49 | const int maxTries = 20;
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| 50 | // tmp changed matt. Q: should one rejected sample
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| 51 | // terminate the whole method?
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[1989] | 52 | for (; i < number; i++)
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| 53 | {
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| 54 | int j = 0;
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| 55 | bool sampleGenerated = false;
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| 56 |
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| 57 | for (j = 0; !sampleGenerated && (j < maxTries); ++ j)
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| 58 | {
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| 59 | sampleGenerated = GenerateSample(ray);
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| 60 |
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| 61 | if (sampleGenerated)
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| 62 | {
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| 63 | ++ samples;
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| 64 | rays.push_back(ray);
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| 65 | }
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| 66 | }
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| 67 | }
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[1520] | 68 |
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[1994] | 69 |
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[1992] | 70 |
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[1772] | 71 |
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| 72 | return samples;
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[1771] | 73 | }
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[1520] | 74 |
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[1771] | 75 |
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[1020] | 76 | /*********************************************************************/
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| 77 | /* Individual sampling strategies implementation */
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| 78 | /*********************************************************************/
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| 79 |
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| 80 |
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[1867] | 81 | bool ObjectBasedDistribution::GenerateSample(SimpleRay &ray)
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[1020] | 82 | {
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[1883] | 83 | Vector3 origin, direction;
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| 84 |
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| 85 | float r[5];
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[1898] | 86 | sHalton.GetNext(5, r);
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[1883] | 87 |
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| 88 | mPreprocessor.mViewCellsManager->GetViewPoint(origin,
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| 89 | Vector3(r[2],r[3],r[4]));
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| 90 |
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[1020] | 91 |
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[1883] | 92 | Vector3 point, normal;
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| 93 |
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[1898] | 94 | r[0] *= (float)mPreprocessor.mObjects.size() - 1;
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[1883] | 95 | const int i = (int)r[0];
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| 96 |
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| 97 | Intersectable *object = mPreprocessor.mObjects[i];
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| 98 |
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| 99 | // take the remainder as a parameter over objects surface
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| 100 | r[0] -= (float)i;
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| 101 |
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| 102 | object->GetRandomSurfacePoint(r[0], r[1], point, normal);
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| 103 |
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| 104 | direction = point - origin;
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| 105 |
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| 106 | const float c = Magnitude(direction);
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| 107 |
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| 108 | if (c <= Limits::Small)
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| 109 | return false;
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| 110 |
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| 111 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 112 | const float pdf = 1.0f;
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| 113 |
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| 114 | direction *= 1.0f / c;
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| 115 | ray = SimpleRay(origin, direction, OBJECT_BASED_DISTRIBUTION, pdf);
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| 116 |
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| 117 | return true;
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| 118 | }
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[1020] | 119 |
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| 120 |
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[1883] | 121 | bool
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| 122 | ObjectDirectionBasedDistribution::GenerateSample(SimpleRay &ray)
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| 123 | {
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| 124 | Vector3 origin, direction;
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[1877] | 125 |
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[1020] | 126 |
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[1883] | 127 | float r[4];
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[1898] | 128 | sHalton.GetNext(4, r);
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[1877] | 129 |
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[1901] | 130 | r[0] *= (float)mPreprocessor.mObjects.size() - 1;
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[1883] | 131 | const int i = (int)r[0];
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| 132 |
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| 133 | Intersectable *object = mPreprocessor.mObjects[i];
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| 134 |
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| 135 | // take the remainder as a parameter over objects surface
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| 136 | r[0] -= (float)i;
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[1020] | 137 |
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[1883] | 138 | Vector3 normal;
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[1020] | 139 |
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[1883] | 140 | object->GetRandomSurfacePoint(r[0], r[1], origin, normal);
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| 141 |
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| 142 | direction = Normalize(CosineRandomVector(r[2], r[3], normal));
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| 143 |
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[1899] | 144 | origin += 1e-2f*direction;
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[1883] | 145 |
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| 146 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 147 | const float pdf = 1.0f;
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| 148 |
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| 149 | ray = SimpleRay(origin, direction, OBJECT_DIRECTION_BASED_DISTRIBUTION, pdf);
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| 150 |
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| 151 | return true;
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[1020] | 152 | }
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| 153 |
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| 154 |
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[1867] | 155 | bool DirectionBasedDistribution::GenerateSample(SimpleRay &ray)
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[1278] | 156 | {
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[1020] | 157 |
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[1952] | 158 | float r[5];
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| 159 | sHalton.GetNext(5, r);
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[1020] | 160 |
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[1952] | 161 | Vector3 origin, direction;
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| 162 | mPreprocessor.mViewCellsManager->GetViewPoint(origin,
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| 163 | Vector3(r[2],r[3],r[4])
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| 164 | );
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| 165 |
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| 166 | direction = UniformRandomVector(r[0], r[1]);
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| 167 | const float c = Magnitude(direction);
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| 168 |
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| 169 | if (c <= Limits::Small)
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| 170 | return false;
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| 171 |
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| 172 | const float pdf = 1.0f;
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| 173 |
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| 174 | direction *= 1.0f / c;
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| 175 | ray = SimpleRay(origin, direction, DIRECTION_BASED_DISTRIBUTION, pdf);
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| 176 |
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| 177 | return true;
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[1020] | 178 | }
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| 179 |
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| 180 |
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[1867] | 181 | bool DirectionBoxBasedDistribution::GenerateSample(SimpleRay &ray)
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[1020] | 182 | {
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| 183 | Vector3 origin, direction;
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| 184 | mPreprocessor.mViewCellsManager->GetViewPoint(origin);
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| 185 |
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[1297] | 186 | const float alpha = RandomValue(0.0f, 2.0f * (float)M_PI);
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| 187 | const float beta = RandomValue((float)-M_PI * 0.5f, (float)M_PI * 0.5f);
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[1020] | 188 |
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| 189 | direction = VssRay::GetDirection(alpha, beta);
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| 190 |
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| 191 | const float c = Magnitude(direction);
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| 192 |
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| 193 | if (c <= Limits::Small)
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| 194 | return false;
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| 195 |
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| 196 | const float pdf = 1.0f;
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| 197 |
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| 198 | direction *= 1.0f / c;
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[1883] | 199 | ray = SimpleRay(origin, direction, DIRECTION_BOX_BASED_DISTRIBUTION, pdf);
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[1020] | 200 |
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| 201 | return true;
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| 202 | }
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| 203 |
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| 204 |
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[1867] | 205 | bool SpatialBoxBasedDistribution::GenerateSample(SimpleRay &ray)
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[1020] | 206 | {
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[1867] | 207 | Vector3 origin, direction;
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[1278] | 208 |
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[1867] | 209 | float r[6];
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[1898] | 210 | sHalton.GetNext(6, r);
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[1867] | 211 | mPreprocessor.mViewCellsManager->GetViewPoint(origin, Vector3(r[0],r[1],r[2]));
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| 212 |
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| 213 | direction = mPreprocessor.mKdTree->GetBox().GetRandomPoint(Vector3(r[3],
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| 214 | r[4],
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| 215 | r[5])
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| 216 | ) - origin;
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| 217 | //cout << "z";
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| 218 | const float c = Magnitude(direction);
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| 219 |
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| 220 | if (c <= Limits::Small)
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| 221 | return false;
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| 222 |
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| 223 | const float pdf = 1.0f;
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| 224 |
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| 225 | direction *= 1.0f / c;
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[1883] | 226 | ray = SimpleRay(origin, direction, SPATIAL_BOX_BASED_DISTRIBUTION, pdf);
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[1867] | 227 |
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| 228 | return true;
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[1020] | 229 | }
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| 230 |
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[1695] | 231 |
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[1867] | 232 | bool ReverseObjectBasedDistribution::GenerateSample(SimpleRay &ray)
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[1695] | 233 | {
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| 234 | Vector3 origin, direction;
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| 235 |
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| 236 | mPreprocessor.mViewCellsManager->GetViewPoint(origin);
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| 237 |
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| 238 | Vector3 point;
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| 239 | Vector3 normal;
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[1999] | 240 |
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[1695] | 241 | const int i = (int)RandomValue(0, (float)mPreprocessor.mObjects.size() - 0.5f);
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| 242 |
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| 243 | Intersectable *object = mPreprocessor.mObjects[i];
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| 244 |
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| 245 | object->GetRandomSurfacePoint(point, normal);
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[1765] | 246 |
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[1695] | 247 | direction = origin - point;
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[1765] | 248 |
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[1695] | 249 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 250 | const float c = Magnitude(direction);
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[1765] | 251 |
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| 252 | if ((c <= Limits::Small) || (DotProd(direction, normal) < 0))
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| 253 | {
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[1695] | 254 | return false;
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[1765] | 255 | }
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[1695] | 256 |
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| 257 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 258 | const float pdf = 1.0f;
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| 259 | //cout << "p: " << point << " ";
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| 260 | direction *= 1.0f / c;
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[1765] | 261 | // a little offset
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[1772] | 262 | point += direction * 0.001f;
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[1765] | 263 |
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[1883] | 264 | ray = SimpleRay(point, direction, REVERSE_OBJECT_BASED_DISTRIBUTION, pdf);
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[1695] | 265 |
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| 266 | return true;
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| 267 | }
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| 268 |
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[1763] | 269 |
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[1867] | 270 | bool ViewCellBorderBasedDistribution::GenerateSample(SimpleRay &ray)
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[1763] | 271 | {
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| 272 | Vector3 origin, direction;
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| 273 |
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| 274 | ViewCellContainer &viewCells = mPreprocessor.mViewCellsManager->GetViewCells();
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| 275 |
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| 276 | Vector3 point;
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| 277 | Vector3 normal, normal2;
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| 278 |
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| 279 | const int vcIdx = (int)RandomValue(0, (float)viewCells.size() - 0.5f);
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| 280 | const int objIdx = (int)RandomValue(0, (float)mPreprocessor.mObjects.size() - 0.5f);
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| 281 |
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| 282 | Intersectable *object = mPreprocessor.mObjects[objIdx];
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| 283 | ViewCell *viewCell = viewCells[vcIdx];
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| 284 |
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[1769] | 285 | //cout << "vc: " << vcIdx << endl;
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| 286 | //cout << "obj: " << objIdx << endl;
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| 287 |
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[1763] | 288 | object->GetRandomSurfacePoint(point, normal);
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| 289 | viewCell->GetRandomEdgePoint(origin, normal2);
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| 290 |
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| 291 | direction = point - origin;
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| 292 |
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| 293 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 294 | const float c = Magnitude(direction);
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| 295 |
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[1769] | 296 | if ((c <= Limits::Small) /*|| (DotProd(direction, normal) < 0)*/)
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[1768] | 297 | {
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[1763] | 298 | return false;
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[1768] | 299 | }
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[1763] | 300 |
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| 301 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 302 | const float pdf = 1.0f;
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| 303 | //cout << "p: " << point << " ";
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| 304 | direction *= 1.0f / c;
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[1883] | 305 | ray = SimpleRay(origin, direction, VIEWCELL_BORDER_BASED_DISTRIBUTION, pdf);
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[1769] | 306 |
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| 307 | //cout << "ray: " << ray.mOrigin << " " << ray.mDirection << endl;
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| 308 |
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[1763] | 309 | return true;
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| 310 | }
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| 311 |
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[1765] | 312 |
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[1520] | 313 | #if 0
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[1867] | 314 | bool ObjectsInteriorDistribution::GenerateSample(SimpleRay &ray)
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[1020] | 315 | {
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| 316 | Vector3 origin, direction;
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| 317 |
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| 318 | // get random object
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| 319 | const int i = RandomValue(0, mPreprocessor.mObjects.size() - 1);
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| 320 |
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| 321 | const Intersectable *obj = mPreprocessor.mObjects[i];
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| 322 |
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| 323 | // note: if we load the polygons as meshes,
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| 324 | // asymtotically every second sample is lost!
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| 325 | origin = obj->GetBox().GetRandomPoint();
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| 326 |
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| 327 | // uniformly distributed direction
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| 328 | direction = UniformRandomVector();
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| 329 |
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| 330 | const float c = Magnitude(direction);
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| 331 |
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| 332 | if (c <= Limits::Small)
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| 333 | return false;
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| 334 |
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| 335 | const float pdf = 1.0f;
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| 336 |
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| 337 | direction *= 1.0f / c;
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| 338 | ray = SimpleRay(origin, direction, pdf);
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| 339 |
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| 340 | return true;
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[1520] | 341 | }
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[1769] | 342 |
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[1520] | 343 | #endif
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[1771] | 344 |
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[1772] | 345 |
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[1867] | 346 | bool ReverseViewSpaceBorderBasedDistribution::GenerateSample(SimpleRay &ray)
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[1772] | 347 | {
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| 348 | Vector3 origin, direction;
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| 349 |
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| 350 | origin = mPreprocessor.mViewCellsManager->GetViewSpaceBox().GetRandomSurfacePoint();
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| 351 |
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| 352 | Vector3 point;
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| 353 | Vector3 normal;
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[1999] | 354 |
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[1772] | 355 | const int i = (int)RandomValue(0, (float)mPreprocessor.mObjects.size() - 0.5f);
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| 356 |
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| 357 | Intersectable *object = mPreprocessor.mObjects[i];
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| 358 |
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| 359 | object->GetRandomSurfacePoint(point, normal);
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| 360 |
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| 361 | direction = origin - point;
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| 362 |
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| 363 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 364 | const float c = Magnitude(direction);
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| 365 |
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| 366 | if ((c <= Limits::Small) || (DotProd(direction, normal) < 0))
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| 367 | {
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| 368 | return false;
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| 369 | }
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| 370 |
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| 371 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 372 | const float pdf = 1.0f;
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| 373 | //cout << "p: " << point << " ";
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| 374 | direction *= 1.0f / c;
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| 375 | // a little offset
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| 376 | point += direction * 0.001f;
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| 377 |
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[1883] | 378 | ray = SimpleRay(point, direction, REVERSE_VIEWSPACE_BORDER_BASED_DISTRIBUTION, pdf);
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[1772] | 379 |
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| 380 | return true;
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| 381 | }
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| 382 |
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| 383 |
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[1867] | 384 | bool ViewSpaceBorderBasedDistribution::GenerateSample(SimpleRay &ray)
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[1772] | 385 | {
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| 386 | Vector3 origin, direction;
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| 387 |
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| 388 | origin = mPreprocessor.mViewCellsManager->GetViewSpaceBox().GetRandomSurfacePoint();
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| 389 |
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| 390 | Vector3 point;
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| 391 | Vector3 normal;
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[2066] | 392 |
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[1772] | 393 | const int i = (int)RandomValue(0, (float)mPreprocessor.mObjects.size() - 0.5f);
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| 394 |
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| 395 | Intersectable *object = mPreprocessor.mObjects[i];
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| 396 |
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| 397 | object->GetRandomSurfacePoint(point, normal);
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| 398 | direction = point - origin;
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| 399 |
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| 400 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 401 | const float c = Magnitude(direction);
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| 402 |
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| 403 | if (c <= Limits::Small)
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| 404 | return false;
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| 405 |
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| 406 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 407 | const float pdf = 1.0f;
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| 408 |
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| 409 | direction *= 1.0f / c;
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| 410 |
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| 411 | // a little offset
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| 412 | origin += direction * 0.001f;
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| 413 |
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[1883] | 414 | ray = SimpleRay(origin, direction, VIEWSPACE_BORDER_BASED_DISTRIBUTION, pdf);
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[1772] | 415 |
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| 416 | return true;
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| 417 | }
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| 418 |
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| 419 |
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[1824] | 420 | bool
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[1867] | 421 | GlobalLinesDistribution::GenerateSample(SimpleRay &ray)
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[1824] | 422 | {
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[1867] | 423 | Vector3 origin, termination, direction;
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[1824] | 424 |
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[1867] | 425 | float radius = 0.5f*Magnitude(mPreprocessor.mViewCellsManager->GetViewSpaceBox().Size());
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| 426 | Vector3 center = mPreprocessor.mViewCellsManager->GetViewSpaceBox().Center();
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| 427 |
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| 428 | const int tries = 1000;
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| 429 | int i;
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| 430 | for (i=0; i < tries; i++) {
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| 431 | float r[4];
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[1898] | 432 | sHalton.GetNext(4, r);
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[1824] | 433 |
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[1867] | 434 | origin = center + (radius*UniformRandomVector(r[0], r[1]));
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| 435 | termination = center + (radius*UniformRandomVector(r[2], r[3]));
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| 436 |
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[1824] | 437 | direction = termination - origin;
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[1867] | 438 |
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| 439 |
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[1824] | 440 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 441 | const float c = Magnitude(direction);
|
---|
| 442 | if (c <= Limits::Small)
|
---|
[1867] | 443 | return false;
|
---|
[1824] | 444 |
|
---|
| 445 | direction *= 1.0f / c;
|
---|
[1867] | 446 |
|
---|
| 447 | // check if the ray intersects the view space box
|
---|
| 448 | static Ray ray;
|
---|
| 449 | ray.Init(origin, direction, Ray::LOCAL_RAY);
|
---|
[1824] | 450 |
|
---|
[1867] | 451 | float tmin, tmax;
|
---|
| 452 | if (mPreprocessor.mViewCellsManager->
|
---|
| 453 | GetViewSpaceBox().ComputeMinMaxT(ray, &tmin, &tmax) && (tmin < tmax))
|
---|
| 454 | break;
|
---|
| 455 | }
|
---|
| 456 |
|
---|
| 457 | if (i!=tries) {
|
---|
[1824] | 458 | // $$ jb the pdf is yet not correct for all sampling methods!
|
---|
| 459 | const float pdf = 1.0f;
|
---|
[1867] | 460 |
|
---|
| 461 |
|
---|
[1883] | 462 | ray = SimpleRay(origin, direction, GLOBAL_LINES_DISTRIBUTION, pdf);
|
---|
[1824] | 463 | ray.mType = Ray::GLOBAL_RAY;
|
---|
| 464 | return true;
|
---|
[1867] | 465 | }
|
---|
| 466 |
|
---|
| 467 | return false;
|
---|
[1771] | 468 | }
|
---|
| 469 |
|
---|
[1883] | 470 |
|
---|
| 471 | // has to called before first usage
|
---|
| 472 | void
|
---|
| 473 | MixtureDistribution::Init()
|
---|
| 474 | {
|
---|
[1884] | 475 | for (int i=0; i < mDistributions.size(); i++) {
|
---|
| 476 | // small non-zero value
|
---|
| 477 | mDistributions[i]->mRays = 1;
|
---|
[1966] | 478 | mDistributions[i]->mGeneratedRays = 1;
|
---|
[1884] | 479 | // unit contribution per ray
|
---|
| 480 | if (1 || mDistributions[i]->mType != RSS_BASED_DISTRIBUTION)
|
---|
| 481 | mDistributions[i]->mContribution = 1.0f;
|
---|
| 482 | else
|
---|
| 483 | mDistributions[i]->mContribution = 0.0f;
|
---|
| 484 | }
|
---|
| 485 | UpdateRatios();
|
---|
[1824] | 486 | }
|
---|
[1884] | 487 |
|
---|
| 488 | void
|
---|
| 489 | MixtureDistribution::Reset()
|
---|
| 490 | {
|
---|
| 491 | for (int i=0; i < mDistributions.size(); i++) {
|
---|
| 492 | // small non-zero value
|
---|
[1891] | 493 | mDistributions[i]->mTotalRays = 0;
|
---|
[1884] | 494 | // unit contribution per ray
|
---|
[1891] | 495 | mDistributions[i]->mTotalContribution = 0.0f;
|
---|
[1884] | 496 | }
|
---|
| 497 | UpdateRatios();
|
---|
| 498 | }
|
---|
| 499 |
|
---|
| 500 | // Generate a new sample according to a mixture distribution
|
---|
[1883] | 501 | bool
|
---|
| 502 | MixtureDistribution::GenerateSample(SimpleRay &ray)
|
---|
| 503 | {
|
---|
[1884] | 504 | float r;
|
---|
[1898] | 505 | sHalton.GetNext(1, &r);
|
---|
[1900] | 506 | int i;
|
---|
[1884] | 507 | // pickup a distribution
|
---|
[1900] | 508 | for (i=0; i < mDistributions.size()-1; i++)
|
---|
[1884] | 509 | if (r < mDistributions[i]->mRatio)
|
---|
| 510 | break;
|
---|
[1891] | 511 |
|
---|
[1966] | 512 | bool result = mDistributions[i]->GenerateSample(ray);
|
---|
| 513 |
|
---|
| 514 | if (result)
|
---|
| 515 | mDistributions[i]->mGeneratedRays++;
|
---|
| 516 |
|
---|
| 517 | return result;
|
---|
[1883] | 518 | }
|
---|
[1824] | 519 |
|
---|
[1883] | 520 | // add contributions of the sample to the strategies
|
---|
| 521 | void
|
---|
[1884] | 522 | MixtureDistribution::ComputeContributions(VssRayContainer &vssRays)
|
---|
[1883] | 523 | {
|
---|
[1884] | 524 | int i;
|
---|
| 525 |
|
---|
| 526 | VssRayContainer::iterator it = vssRays.begin();
|
---|
[1883] | 527 |
|
---|
[1891] | 528 | for (i=0; i < mDistributions.size(); i++) {
|
---|
| 529 | mDistributions[i]->mContribution = 0;
|
---|
| 530 | mDistributions[i]->mRays = 0;
|
---|
| 531 | }
|
---|
| 532 |
|
---|
[1884] | 533 | for(; it != vssRays.end(); ++it) {
|
---|
| 534 | VssRay *ray = *it;
|
---|
[1891] | 535 | for (i=0; i < mDistributions.size()-1; i++) {
|
---|
[1884] | 536 | if (mDistributions[i]->mType == ray->mDistribution)
|
---|
| 537 | break;
|
---|
[1891] | 538 | }
|
---|
| 539 |
|
---|
[1884] | 540 | float contribution =
|
---|
[1942] | 541 | mPreprocessor.mViewCellsManager->ComputeSampleContribution(*ray,
|
---|
| 542 | true,
|
---|
| 543 | false);
|
---|
[1931] | 544 |
|
---|
[1888] | 545 | mDistributions[i]->mContribution += contribution;
|
---|
[1884] | 546 | mDistributions[i]->mRays ++;
|
---|
[1900] | 547 |
|
---|
[1891] | 548 | mDistributions[i]->mTotalContribution += contribution;
|
---|
| 549 | mDistributions[i]->mTotalRays ++;
|
---|
[1884] | 550 | }
|
---|
| 551 |
|
---|
[2019] | 552 | #if 0
|
---|
[2015] | 553 | pvsTimer.Entry();
|
---|
| 554 | // resort pvss
|
---|
| 555 | mPreprocessor.mViewCellsManager->SortViewCellPvs();
|
---|
| 556 | pvsTimer.Exit();
|
---|
[2019] | 557 | #endif
|
---|
[2044] | 558 |
|
---|
[1884] | 559 |
|
---|
| 560 | UpdateRatios();
|
---|
[1966] | 561 |
|
---|
[2044] | 562 | #if 1
|
---|
[2043] | 563 | cout<<"view cell cast time:"<<viewCellCastTimer.TotalTime()<<" s"<<endl;
|
---|
| 564 | cout<<"pvs time:"<<pvsTimer.TotalTime()<<" s"<<endl;
|
---|
[2044] | 565 | // cout<<"obj time:"<<objTimer.TotalTime()<<" s"<<endl;
|
---|
| 566 | #endif
|
---|
[1883] | 567 | }
|
---|
| 568 |
|
---|
[1884] | 569 | void
|
---|
[1942] | 570 | MixtureDistribution::UpdateDistributions(VssRayContainer &vssRays)
|
---|
| 571 | {
|
---|
| 572 | // now update the distributions with all the rays
|
---|
| 573 | for (int i=0; i < mDistributions.size(); i++) {
|
---|
| 574 | mDistributions[i]->Update(vssRays);
|
---|
| 575 | }
|
---|
| 576 | }
|
---|
[1966] | 577 |
|
---|
[1974] | 578 | #define RAY_CAST_TIME 0.7f
|
---|
| 579 | #define VIEWCELL_CAST_TIME 0.3f
|
---|
[1966] | 580 |
|
---|
[1942] | 581 | void
|
---|
[1884] | 582 | MixtureDistribution::UpdateRatios()
|
---|
| 583 | {
|
---|
| 584 | // now compute importance (ratio) of all distributions
|
---|
| 585 | float sum = 0.0f;
|
---|
| 586 | int i;
|
---|
| 587 | for (i=0; i < mDistributions.size(); i++) {
|
---|
[1891] | 588 | cout<<i<<": c="<<mDistributions[i]->mContribution<<
|
---|
| 589 | " rays="<<mDistributions[i]->mRays<<endl;
|
---|
| 590 | float importance = 0.0f;
|
---|
| 591 | if (mDistributions[i]->mRays != 0) {
|
---|
[1966] | 592 | //importance = pow(mDistributions[i]->mContribution/mDistributions[i]->mRays, 2);
|
---|
| 593 | importance = mDistributions[i]->mContribution/
|
---|
| 594 | (RAY_CAST_TIME*mDistributions[i]->mGeneratedRays +
|
---|
| 595 | VIEWCELL_CAST_TIME*mDistributions[i]->mRays);
|
---|
[1891] | 596 | }
|
---|
[1884] | 597 | mDistributions[i]->mRatio = importance;
|
---|
| 598 | sum += importance;
|
---|
| 599 | }
|
---|
[1891] | 600 |
|
---|
[1966] | 601 | if (sum == 0.0f)
|
---|
| 602 | sum = Limits::Small;
|
---|
[1974] | 603 |
|
---|
[1966] | 604 | const float minratio = 0.01f;
|
---|
[1974] | 605 |
|
---|
| 606 | for (i=0; i < mDistributions.size(); i++) {
|
---|
| 607 | mDistributions[i]->mRatio /= sum;
|
---|
| 608 | if (mDistributions[i]->mRatio < minratio)
|
---|
| 609 | mDistributions[i]->mRatio = minratio;
|
---|
| 610 | }
|
---|
[1966] | 611 |
|
---|
[1974] | 612 | // recaluate the sum after clip
|
---|
[1966] | 613 | sum = 0.0f;
|
---|
[1974] | 614 | for (i=0; i < mDistributions.size(); i++)
|
---|
[1966] | 615 | sum += mDistributions[i]->mRatio;
|
---|
[1974] | 616 |
|
---|
| 617 | for (i=0; i < mDistributions.size(); i++)
|
---|
| 618 | mDistributions[i]->mRatio /= sum;
|
---|
[1884] | 619 |
|
---|
| 620 | for (i=1; i < mDistributions.size(); i++) {
|
---|
[1974] | 621 | mDistributions[i]->mRatio = mDistributions[i-1]->mRatio + mDistributions[i]->mRatio;
|
---|
[1884] | 622 | }
|
---|
| 623 |
|
---|
| 624 | cout<<"ratios: ";
|
---|
[1931] | 625 | float last = 0.0f;
|
---|
| 626 | for (i=0; i < mDistributions.size(); i++) {
|
---|
| 627 | cout<<mDistributions[i]->mRatio-last<<" ";
|
---|
| 628 | last = mDistributions[i]->mRatio;
|
---|
| 629 | }
|
---|
[1884] | 630 | cout<<endl;
|
---|
[1883] | 631 | }
|
---|
[1891] | 632 |
|
---|
| 633 |
|
---|
| 634 |
|
---|
| 635 | bool
|
---|
| 636 | MixtureDistribution::Construct(char *str)
|
---|
| 637 | {
|
---|
| 638 | char *curr = str;
|
---|
| 639 |
|
---|
| 640 | while (1) {
|
---|
| 641 | char *e = strchr(curr,'+');
|
---|
| 642 | if (e!=NULL) {
|
---|
| 643 | *e=0;
|
---|
| 644 | }
|
---|
| 645 |
|
---|
| 646 | if (strcmp(curr, "rss")==0) {
|
---|
| 647 | mDistributions.push_back(new RssBasedDistribution(mPreprocessor));
|
---|
| 648 | } else
|
---|
| 649 | if (strcmp(curr, "object")==0) {
|
---|
| 650 | mDistributions.push_back(new ObjectBasedDistribution(mPreprocessor));
|
---|
| 651 | } else
|
---|
| 652 | if (strcmp(curr, "spatial")==0) {
|
---|
| 653 | mDistributions.push_back(new SpatialBoxBasedDistribution(mPreprocessor));
|
---|
| 654 | } else
|
---|
| 655 | if (strcmp(curr, "global")==0) {
|
---|
| 656 | mDistributions.push_back(new GlobalLinesDistribution(mPreprocessor));
|
---|
| 657 | } else
|
---|
| 658 | if (strcmp(curr, "direction")==0) {
|
---|
| 659 | mDistributions.push_back(new DirectionBasedDistribution(mPreprocessor));
|
---|
| 660 | } else
|
---|
| 661 | if (strcmp(curr, "object_direction")==0) {
|
---|
| 662 | mDistributions.push_back(new ObjectDirectionBasedDistribution(mPreprocessor));
|
---|
| 663 | } else
|
---|
| 664 | if (strcmp(curr, "reverse_object")==0) {
|
---|
| 665 | mDistributions.push_back(new ReverseObjectBasedDistribution(mPreprocessor));
|
---|
| 666 | } else
|
---|
[2044] | 667 |
|
---|
[1891] | 668 | if (strcmp(curr, "reverse_viewspace_border")==0) {
|
---|
| 669 | mDistributions.push_back(new ReverseViewSpaceBorderBasedDistribution(mPreprocessor));
|
---|
[1952] | 670 | } else
|
---|
| 671 | if (strcmp(curr, "mutation")==0) {
|
---|
[2048] | 672 | mDistributions.push_back(new MutationBasedDistribution(mPreprocessor));
|
---|
[2001] | 673 | }
|
---|
[1891] | 674 |
|
---|
[1952] | 675 |
|
---|
[1891] | 676 | if (e==NULL)
|
---|
| 677 | break;
|
---|
| 678 | curr = e+1;
|
---|
| 679 | }
|
---|
| 680 |
|
---|
| 681 | Init();
|
---|
| 682 | return true;
|
---|
[1884] | 683 | }
|
---|
[1883] | 684 |
|
---|
[1966] | 685 | int
|
---|
| 686 | MixtureDistribution::GenerateSamples(const int number,
|
---|
| 687 | SimpleRayContainer &rays)
|
---|
| 688 | {
|
---|
| 689 | for (int i=0; i < mDistributions.size(); i++)
|
---|
| 690 | mDistributions[i]->mGeneratedRays = 0;
|
---|
[1952] | 691 |
|
---|
[1966] | 692 | return SamplingStrategy::GenerateSamples(number, rays);
|
---|
| 693 | }
|
---|
[1952] | 694 |
|
---|
[1974] | 695 |
|
---|
[1966] | 696 |
|
---|
[1968] | 697 | bool HwGlobalLinesDistribution::GenerateSample(SimpleRay &ray)
|
---|
| 698 | {
|
---|
| 699 | Vector3 origin, termination, direction;
|
---|
| 700 |
|
---|
| 701 | float radius = 0.5f *
|
---|
| 702 | Magnitude(mPreprocessor.mViewCellsManager->GetViewSpaceBox().Size());
|
---|
| 703 |
|
---|
| 704 | Vector3 center = mPreprocessor.mViewCellsManager->GetViewSpaceBox().Center();
|
---|
| 705 |
|
---|
| 706 | const int tries = 1000;
|
---|
| 707 | int i;
|
---|
| 708 | for (i=0; i < tries; i++)
|
---|
| 709 | {
|
---|
| 710 | float r[2];
|
---|
| 711 | sHalton.GetNext(2, r);
|
---|
| 712 |
|
---|
| 713 | origin = center + (radius * UniformRandomVector(r[0], r[1]));
|
---|
| 714 | termination = center;
|
---|
| 715 |
|
---|
| 716 | if (0)
|
---|
| 717 | {
|
---|
| 718 | // add a small offset to provide some more randomness in the sampling
|
---|
| 719 | Vector3 offset(Random(radius * 1e-3f),
|
---|
| 720 | Random(radius * 1e-3f),
|
---|
| 721 | Random(radius * 1e-3f));
|
---|
| 722 | termination += offset;
|
---|
| 723 | }
|
---|
| 724 |
|
---|
| 725 | direction = termination - origin;
|
---|
| 726 |
|
---|
| 727 | // $$ jb the pdf is yet not correct for all sampling methods!
|
---|
| 728 | const float c = Magnitude(direction);
|
---|
| 729 |
|
---|
| 730 | if (c <= Limits::Small)
|
---|
| 731 | return false;
|
---|
| 732 |
|
---|
| 733 | direction *= 1.0f / c;
|
---|
| 734 |
|
---|
| 735 | // check if the ray intersects the view space box
|
---|
| 736 | static Ray ray;
|
---|
| 737 | ray.Init(origin, direction, Ray::LOCAL_RAY);
|
---|
| 738 |
|
---|
| 739 | float tmin, tmax;
|
---|
| 740 | if (mPreprocessor.mViewCellsManager->
|
---|
| 741 | GetViewSpaceBox().ComputeMinMaxT(ray, &tmin, &tmax) && (tmin < tmax))
|
---|
| 742 | break;
|
---|
| 743 | }
|
---|
| 744 |
|
---|
| 745 | if (i != tries)
|
---|
| 746 | {
|
---|
| 747 | // $$ jb the pdf is yet not correct for all sampling methods!
|
---|
| 748 | const float pdf = 1.0f;
|
---|
| 749 |
|
---|
| 750 | ray = SimpleRay(origin, direction, HW_GLOBAL_LINES_DISTRIBUTION, pdf);
|
---|
| 751 | ray.mType = Ray::GLOBAL_RAY;
|
---|
| 752 | return true;
|
---|
| 753 | }
|
---|
| 754 |
|
---|
| 755 | return false;
|
---|
[1952] | 756 | }
|
---|
| 757 |
|
---|
| 758 |
|
---|
[1996] | 759 | bool ViewCellBasedDistribution::GenerateSample(SimpleRay &ray)
|
---|
| 760 | {
|
---|
| 761 | Vector3 origin, direction;
|
---|
| 762 |
|
---|
| 763 | ViewCellContainer &viewCells =
|
---|
| 764 | mPreprocessor.mViewCellsManager->GetViewCells();
|
---|
| 765 |
|
---|
| 766 | Vector3 point;
|
---|
[2003] | 767 | Vector3 normal;
|
---|
| 768 |
|
---|
| 769 | //Vector normalObj;
|
---|
[2000] | 770 | // float r[1];
|
---|
| 771 | // sHalton.GetNext(1, r);
|
---|
| 772 | // const int objIdx = (int)(r[0] * (float)mPreprocessor.mObjects.size() - 1.0f);
|
---|
| 773 | // Intersectable *object = mPreprocessor.mObjects[objIdx];
|
---|
| 774 | // object->GetRandomSurfacePoint(point, normal);
|
---|
| 775 | // cout << "obj: " << objIdx << endl;
|
---|
[1996] | 776 |
|
---|
[2000] | 777 | float r[2];
|
---|
| 778 | sHalton.GetNext(2, r);
|
---|
[1996] | 779 |
|
---|
[2000] | 780 | direction = UniformRandomVector(r[0], r[1]);
|
---|
| 781 | const float c = Magnitude(direction);
|
---|
[1996] | 782 |
|
---|
[2000] | 783 | if (c <= Limits::Small)
|
---|
| 784 | return false;
|
---|
| 785 |
|
---|
| 786 | direction *= 1.0f / c;
|
---|
| 787 |
|
---|
| 788 | // get point on view cell surface
|
---|
[2003] | 789 | mViewCell->GetRandomSurfacePoint(origin, normal);
|
---|
[1996] | 790 |
|
---|
[2000] | 791 | //direction = point - origin;
|
---|
[1996] | 792 |
|
---|
| 793 | // move a little bit back to avoid piercing through walls
|
---|
| 794 | // that bound the view cell
|
---|
[2003] | 795 | origin -= 0.01f * normal;
|
---|
[1996] | 796 |
|
---|
| 797 | // $$ jb the pdf is yet not correct for all sampling methods!
|
---|
| 798 | const float pdf = 1.0f;
|
---|
| 799 |
|
---|
| 800 | ray = SimpleRay(origin, direction, VIEWCELL_BASED_DISTRIBUTION, pdf);
|
---|
| 801 |
|
---|
| 802 | //cout << "ray: " << ray.mOrigin << " " << ray.mDirection << endl;
|
---|
| 803 |
|
---|
| 804 | return true;
|
---|
[1968] | 805 | }
|
---|
| 806 |
|
---|
| 807 |
|
---|
[1996] | 808 | }
|
---|
| 809 |
|
---|
| 810 |
|
---|