[2575] | 1 |
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[1020] | 2 | #include "SamplingStrategy.h"
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| 3 | #include "Ray.h"
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| 4 | #include "Intersectable.h"
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| 5 | #include "Preprocessor.h"
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| 6 | #include "ViewCellsManager.h"
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| 7 | #include "AxisAlignedBox3.h"
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[1891] | 8 | #include "RssTree.h"
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[1989] | 9 | #include "Mutation.h"
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[2575] | 10 | #include "FilterBasedDistribution.h"
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[2548] | 11 | #include "DifferenceSampling.h"
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[1020] | 12 |
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[2069] | 13 |
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[2575] | 14 | #ifdef PERFTIMER
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| 15 | #include "Timer/PerfTimer.h"
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| 16 | #endif
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[2548] | 17 |
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[1020] | 18 | namespace GtpVisibilityPreprocessor {
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| 19 |
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[2575] | 20 |
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| 21 | #ifdef PERFTIMER
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[2076] | 22 | extern PerfTimer haltonTimer;
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[2044] | 23 | extern PerfTimer pvsTimer;
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| 24 | extern PerfTimer viewCellCastTimer;
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[2575] | 25 | #endif
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| 26 |
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[1901] | 27 | //HaltonSequence SamplingStrategy::sHalton;
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| 28 |
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[1899] | 29 | HaltonSequence ObjectBasedDistribution::sHalton;
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| 30 | HaltonSequence MixtureDistribution::sHalton;
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| 31 | HaltonSequence GlobalLinesDistribution::sHalton;
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| 32 | HaltonSequence SpatialBoxBasedDistribution::sHalton;
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| 33 | HaltonSequence ObjectDirectionBasedDistribution::sHalton;
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[1952] | 34 | HaltonSequence DirectionBasedDistribution::sHalton;
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[1968] | 35 | HaltonSequence HwGlobalLinesDistribution::sHalton;
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[1899] | 36 |
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[1996] | 37 | HaltonSequence ViewCellBasedDistribution::sHalton;
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[1899] | 38 |
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[1884] | 39 | SamplingStrategy::SamplingStrategy(Preprocessor &preprocessor):
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[1968] | 40 | mPreprocessor(preprocessor),
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| 41 | mRatio(1.0f),
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| 42 | mTotalRays(0),
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| 43 | mTotalContribution(0.0f)
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| 44 | {
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[1520] | 45 | }
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| 46 |
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| 47 |
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| 48 | SamplingStrategy::~SamplingStrategy()
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| 49 | {
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| 50 | }
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| 51 |
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[1771] | 52 | int
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| 53 | SamplingStrategy::GenerateSamples(const int number,
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[1867] | 54 | SimpleRayContainer &rays)
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[1771] | 55 | {
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[1772] | 56 | SimpleRay ray;
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| 57 | int samples = 0;
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| 58 | int i = 0;
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| 59 | const int maxTries = 20;
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| 60 | // tmp changed matt. Q: should one rejected sample
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| 61 | // terminate the whole method?
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[1989] | 62 | for (; i < number; i++)
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[2187] | 63 | {
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[1989] | 64 | int j = 0;
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| 65 | bool sampleGenerated = false;
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[2187] | 66 |
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[1989] | 67 | for (j = 0; !sampleGenerated && (j < maxTries); ++ j)
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[2187] | 68 | {
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[1989] | 69 | sampleGenerated = GenerateSample(ray);
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[2187] | 70 |
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[1989] | 71 | if (sampleGenerated)
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[2187] | 72 | {
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[1989] | 73 | ++ samples;
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| 74 | rays.push_back(ray);
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[2187] | 75 | }
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| 76 | }
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| 77 | }
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[1520] | 78 |
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[1772] | 79 | return samples;
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[1771] | 80 | }
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[1520] | 81 |
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[1771] | 82 |
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[1020] | 83 | /*********************************************************************/
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| 84 | /* Individual sampling strategies implementation */
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| 85 | /*********************************************************************/
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| 86 |
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| 87 |
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[1867] | 88 | bool ObjectBasedDistribution::GenerateSample(SimpleRay &ray)
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[1020] | 89 | {
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[1883] | 90 | Vector3 origin, direction;
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| 91 |
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| 92 | float r[5];
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[1898] | 93 | sHalton.GetNext(5, r);
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[1883] | 94 |
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| 95 | mPreprocessor.mViewCellsManager->GetViewPoint(origin,
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| 96 | Vector3(r[2],r[3],r[4]));
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| 97 |
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[1020] | 98 |
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[1883] | 99 | Vector3 point, normal;
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| 100 |
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[1898] | 101 | r[0] *= (float)mPreprocessor.mObjects.size() - 1;
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[1883] | 102 | const int i = (int)r[0];
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| 103 |
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| 104 | Intersectable *object = mPreprocessor.mObjects[i];
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| 105 |
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| 106 | // take the remainder as a parameter over objects surface
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| 107 | r[0] -= (float)i;
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| 108 |
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| 109 | object->GetRandomSurfacePoint(r[0], r[1], point, normal);
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| 110 |
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| 111 | direction = point - origin;
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| 112 |
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| 113 | const float c = Magnitude(direction);
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| 114 |
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| 115 | if (c <= Limits::Small)
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| 116 | return false;
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| 117 |
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| 118 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 119 | const float pdf = 1.0f;
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| 120 |
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| 121 | direction *= 1.0f / c;
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| 122 | ray = SimpleRay(origin, direction, OBJECT_BASED_DISTRIBUTION, pdf);
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| 123 |
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| 124 | return true;
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| 125 | }
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[1020] | 126 |
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| 127 |
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[1883] | 128 | bool
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| 129 | ObjectDirectionBasedDistribution::GenerateSample(SimpleRay &ray)
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| 130 | {
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| 131 | Vector3 origin, direction;
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[1877] | 132 |
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[1020] | 133 |
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[1883] | 134 | float r[4];
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[1898] | 135 | sHalton.GetNext(4, r);
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[1877] | 136 |
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[2076] | 137 | // static Halton<4> halton;
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| 138 | // halton.GetNext(r);
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| 139 |
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[1901] | 140 | r[0] *= (float)mPreprocessor.mObjects.size() - 1;
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[1883] | 141 | const int i = (int)r[0];
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| 142 |
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| 143 | Intersectable *object = mPreprocessor.mObjects[i];
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| 144 |
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| 145 | // take the remainder as a parameter over objects surface
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| 146 | r[0] -= (float)i;
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[1020] | 147 |
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[1883] | 148 | Vector3 normal;
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[1020] | 149 |
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[1883] | 150 | object->GetRandomSurfacePoint(r[0], r[1], origin, normal);
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| 151 |
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| 152 | direction = Normalize(CosineRandomVector(r[2], r[3], normal));
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| 153 |
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[1899] | 154 | origin += 1e-2f*direction;
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[1883] | 155 |
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| 156 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 157 | const float pdf = 1.0f;
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| 158 |
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| 159 | ray = SimpleRay(origin, direction, OBJECT_DIRECTION_BASED_DISTRIBUTION, pdf);
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| 160 |
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| 161 | return true;
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[1020] | 162 | }
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| 163 |
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| 164 |
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[1867] | 165 | bool DirectionBasedDistribution::GenerateSample(SimpleRay &ray)
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[1278] | 166 | {
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[1020] | 167 |
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[1952] | 168 | float r[5];
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| 169 | sHalton.GetNext(5, r);
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[1020] | 170 |
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[1952] | 171 | Vector3 origin, direction;
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| 172 | mPreprocessor.mViewCellsManager->GetViewPoint(origin,
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| 173 | Vector3(r[2],r[3],r[4])
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| 174 | );
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| 175 |
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| 176 | direction = UniformRandomVector(r[0], r[1]);
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| 177 | const float c = Magnitude(direction);
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| 178 |
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| 179 | if (c <= Limits::Small)
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| 180 | return false;
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| 181 |
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| 182 | const float pdf = 1.0f;
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| 183 |
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| 184 | direction *= 1.0f / c;
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| 185 | ray = SimpleRay(origin, direction, DIRECTION_BASED_DISTRIBUTION, pdf);
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| 186 |
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| 187 | return true;
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[1020] | 188 | }
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| 189 |
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| 190 |
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[1867] | 191 | bool DirectionBoxBasedDistribution::GenerateSample(SimpleRay &ray)
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[1020] | 192 | {
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| 193 | Vector3 origin, direction;
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| 194 | mPreprocessor.mViewCellsManager->GetViewPoint(origin);
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| 195 |
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[1297] | 196 | const float alpha = RandomValue(0.0f, 2.0f * (float)M_PI);
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| 197 | const float beta = RandomValue((float)-M_PI * 0.5f, (float)M_PI * 0.5f);
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[1020] | 198 |
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| 199 | direction = VssRay::GetDirection(alpha, beta);
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| 200 |
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| 201 | const float c = Magnitude(direction);
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| 202 |
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| 203 | if (c <= Limits::Small)
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| 204 | return false;
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| 205 |
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| 206 | const float pdf = 1.0f;
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| 207 |
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| 208 | direction *= 1.0f / c;
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[1883] | 209 | ray = SimpleRay(origin, direction, DIRECTION_BOX_BASED_DISTRIBUTION, pdf);
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[1020] | 210 |
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| 211 | return true;
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| 212 | }
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| 213 |
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| 214 |
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[1867] | 215 | bool SpatialBoxBasedDistribution::GenerateSample(SimpleRay &ray)
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[1020] | 216 | {
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[2071] | 217 |
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[2072] | 218 | Vector3 origin, direction;
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[1278] | 219 |
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[2072] | 220 | float r[6];
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| 221 | sHalton.GetNext(6, r);
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[2199] | 222 |
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[2076] | 223 | mPreprocessor.mViewCellsManager->GetViewPoint(origin, Vector3(r[0],
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| 224 | r[1],
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| 225 | r[2]));
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[2072] | 226 |
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| 227 | direction = mPreprocessor.mKdTree->GetBox().GetRandomPoint(Vector3(r[3],
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| 228 | r[4],
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| 229 | r[5])
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[2575] | 230 | ) - origin;
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[2199] | 231 |
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[2072] | 232 | const float c = Magnitude(direction);
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| 233 |
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| 234 | if (c <= Limits::Small)
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| 235 | return false;
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| 236 |
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| 237 | const float pdf = 1.0f;
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| 238 |
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| 239 | direction *= 1.0f / c;
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| 240 | ray = SimpleRay(origin, direction, SPATIAL_BOX_BASED_DISTRIBUTION, pdf);
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[1867] | 241 |
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[2072] | 242 | return true;
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[1020] | 243 | }
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| 244 |
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[1695] | 245 |
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[1867] | 246 | bool ReverseObjectBasedDistribution::GenerateSample(SimpleRay &ray)
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[1695] | 247 | {
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| 248 | Vector3 origin, direction;
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| 249 |
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| 250 | mPreprocessor.mViewCellsManager->GetViewPoint(origin);
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| 251 |
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| 252 | Vector3 point;
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| 253 | Vector3 normal;
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[1999] | 254 |
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[1695] | 255 | const int i = (int)RandomValue(0, (float)mPreprocessor.mObjects.size() - 0.5f);
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| 256 |
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| 257 | Intersectable *object = mPreprocessor.mObjects[i];
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| 258 |
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| 259 | object->GetRandomSurfacePoint(point, normal);
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[1765] | 260 |
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[1695] | 261 | direction = origin - point;
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[1765] | 262 |
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[1695] | 263 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 264 | const float c = Magnitude(direction);
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[1765] | 265 |
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| 266 | if ((c <= Limits::Small) || (DotProd(direction, normal) < 0))
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| 267 | {
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[1695] | 268 | return false;
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[1765] | 269 | }
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[1695] | 270 |
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| 271 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 272 | const float pdf = 1.0f;
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[2072] | 273 |
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[1695] | 274 | direction *= 1.0f / c;
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[1765] | 275 | // a little offset
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[1772] | 276 | point += direction * 0.001f;
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[1765] | 277 |
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[1883] | 278 | ray = SimpleRay(point, direction, REVERSE_OBJECT_BASED_DISTRIBUTION, pdf);
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[1695] | 279 |
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| 280 | return true;
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| 281 | }
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| 282 |
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[1763] | 283 |
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[1867] | 284 | bool ViewCellBorderBasedDistribution::GenerateSample(SimpleRay &ray)
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[1763] | 285 | {
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| 286 | Vector3 origin, direction;
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| 287 |
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| 288 | ViewCellContainer &viewCells = mPreprocessor.mViewCellsManager->GetViewCells();
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| 289 |
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| 290 | Vector3 point;
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| 291 | Vector3 normal, normal2;
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| 292 |
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| 293 | const int vcIdx = (int)RandomValue(0, (float)viewCells.size() - 0.5f);
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| 294 | const int objIdx = (int)RandomValue(0, (float)mPreprocessor.mObjects.size() - 0.5f);
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| 295 |
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| 296 | Intersectable *object = mPreprocessor.mObjects[objIdx];
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| 297 | ViewCell *viewCell = viewCells[vcIdx];
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| 298 |
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| 299 | object->GetRandomSurfacePoint(point, normal);
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| 300 | viewCell->GetRandomEdgePoint(origin, normal2);
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| 301 |
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| 302 | direction = point - origin;
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| 303 |
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| 304 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 305 | const float c = Magnitude(direction);
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| 306 |
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[1769] | 307 | if ((c <= Limits::Small) /*|| (DotProd(direction, normal) < 0)*/)
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[1768] | 308 | {
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[1763] | 309 | return false;
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[1768] | 310 | }
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[1763] | 311 |
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| 312 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 313 | const float pdf = 1.0f;
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| 314 | //cout << "p: " << point << " ";
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| 315 | direction *= 1.0f / c;
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[1883] | 316 | ray = SimpleRay(origin, direction, VIEWCELL_BORDER_BASED_DISTRIBUTION, pdf);
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[1769] | 317 |
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| 318 | //cout << "ray: " << ray.mOrigin << " " << ray.mDirection << endl;
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| 319 |
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[1763] | 320 | return true;
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| 321 | }
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| 322 |
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[1765] | 323 |
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[1867] | 324 | bool ReverseViewSpaceBorderBasedDistribution::GenerateSample(SimpleRay &ray)
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[1772] | 325 | {
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| 326 | Vector3 origin, direction;
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| 327 |
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| 328 | origin = mPreprocessor.mViewCellsManager->GetViewSpaceBox().GetRandomSurfacePoint();
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| 329 |
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| 330 | Vector3 point;
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| 331 | Vector3 normal;
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[1999] | 332 |
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[1772] | 333 | const int i = (int)RandomValue(0, (float)mPreprocessor.mObjects.size() - 0.5f);
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| 334 |
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| 335 | Intersectable *object = mPreprocessor.mObjects[i];
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| 336 |
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| 337 | object->GetRandomSurfacePoint(point, normal);
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| 338 |
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| 339 | direction = origin - point;
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| 340 |
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| 341 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 342 | const float c = Magnitude(direction);
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| 343 |
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| 344 | if ((c <= Limits::Small) || (DotProd(direction, normal) < 0))
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| 345 | {
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| 346 | return false;
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| 347 | }
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| 348 |
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| 349 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 350 | const float pdf = 1.0f;
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| 351 | //cout << "p: " << point << " ";
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| 352 | direction *= 1.0f / c;
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| 353 | // a little offset
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| 354 | point += direction * 0.001f;
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| 355 |
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[1883] | 356 | ray = SimpleRay(point, direction, REVERSE_VIEWSPACE_BORDER_BASED_DISTRIBUTION, pdf);
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[1772] | 357 |
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| 358 | return true;
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| 359 | }
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| 360 |
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| 361 |
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[1867] | 362 | bool ViewSpaceBorderBasedDistribution::GenerateSample(SimpleRay &ray)
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[1772] | 363 | {
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| 364 | Vector3 origin, direction;
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| 365 |
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| 366 | origin = mPreprocessor.mViewCellsManager->GetViewSpaceBox().GetRandomSurfacePoint();
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| 367 |
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| 368 | Vector3 point;
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| 369 | Vector3 normal;
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[2066] | 370 |
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[1772] | 371 | const int i = (int)RandomValue(0, (float)mPreprocessor.mObjects.size() - 0.5f);
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| 372 |
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| 373 | Intersectable *object = mPreprocessor.mObjects[i];
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| 374 |
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| 375 | object->GetRandomSurfacePoint(point, normal);
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| 376 | direction = point - origin;
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| 377 |
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| 378 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 379 | const float c = Magnitude(direction);
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| 380 |
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| 381 | if (c <= Limits::Small)
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| 382 | return false;
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| 383 |
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| 384 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 385 | const float pdf = 1.0f;
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| 386 |
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| 387 | direction *= 1.0f / c;
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| 388 |
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| 389 | // a little offset
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| 390 | origin += direction * 0.001f;
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| 391 |
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[1883] | 392 | ray = SimpleRay(origin, direction, VIEWSPACE_BORDER_BASED_DISTRIBUTION, pdf);
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[1772] | 393 |
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| 394 | return true;
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| 395 | }
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| 396 |
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| 397 |
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[1824] | 398 | bool
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[1867] | 399 | GlobalLinesDistribution::GenerateSample(SimpleRay &ray)
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[1824] | 400 | {
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[1867] | 401 | Vector3 origin, termination, direction;
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[1824] | 402 |
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[1867] | 403 | float radius = 0.5f*Magnitude(mPreprocessor.mViewCellsManager->GetViewSpaceBox().Size());
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| 404 | Vector3 center = mPreprocessor.mViewCellsManager->GetViewSpaceBox().Center();
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| 405 |
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| 406 | const int tries = 1000;
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| 407 | int i;
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| 408 | for (i=0; i < tries; i++) {
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| 409 | float r[4];
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[1898] | 410 | sHalton.GetNext(4, r);
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[1824] | 411 |
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[1867] | 412 | origin = center + (radius*UniformRandomVector(r[0], r[1]));
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| 413 | termination = center + (radius*UniformRandomVector(r[2], r[3]));
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| 414 |
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[1824] | 415 | direction = termination - origin;
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[1867] | 416 |
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| 417 |
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[1824] | 418 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 419 | const float c = Magnitude(direction);
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| 420 | if (c <= Limits::Small)
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[1867] | 421 | return false;
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[1824] | 422 |
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| 423 | direction *= 1.0f / c;
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[1867] | 424 |
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| 425 | // check if the ray intersects the view space box
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| 426 | static Ray ray;
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| 427 | ray.Init(origin, direction, Ray::LOCAL_RAY);
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[1824] | 428 |
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[1867] | 429 | float tmin, tmax;
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| 430 | if (mPreprocessor.mViewCellsManager->
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| 431 | GetViewSpaceBox().ComputeMinMaxT(ray, &tmin, &tmax) && (tmin < tmax))
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| 432 | break;
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| 433 | }
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| 434 |
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| 435 | if (i!=tries) {
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[1824] | 436 | // $$ jb the pdf is yet not correct for all sampling methods!
|
---|
| 437 | const float pdf = 1.0f;
|
---|
[1867] | 438 |
|
---|
| 439 |
|
---|
[1883] | 440 | ray = SimpleRay(origin, direction, GLOBAL_LINES_DISTRIBUTION, pdf);
|
---|
[1824] | 441 | ray.mType = Ray::GLOBAL_RAY;
|
---|
| 442 | return true;
|
---|
[1867] | 443 | }
|
---|
| 444 |
|
---|
| 445 | return false;
|
---|
[1771] | 446 | }
|
---|
| 447 |
|
---|
[1883] | 448 |
|
---|
[2210] | 449 | /******************************************************************/
|
---|
| 450 | /* class MixtureDistribution implementation */
|
---|
| 451 | /******************************************************************/
|
---|
| 452 |
|
---|
| 453 |
|
---|
| 454 | // has to be called before first usage
|
---|
[1883] | 455 | void
|
---|
| 456 | MixtureDistribution::Init()
|
---|
| 457 | {
|
---|
[1884] | 458 | for (int i=0; i < mDistributions.size(); i++) {
|
---|
| 459 | // small non-zero value
|
---|
| 460 | mDistributions[i]->mRays = 1;
|
---|
[1966] | 461 | mDistributions[i]->mGeneratedRays = 1;
|
---|
[1884] | 462 | // unit contribution per ray
|
---|
| 463 | if (1 || mDistributions[i]->mType != RSS_BASED_DISTRIBUTION)
|
---|
| 464 | mDistributions[i]->mContribution = 1.0f;
|
---|
| 465 | else
|
---|
| 466 | mDistributions[i]->mContribution = 0.0f;
|
---|
| 467 | }
|
---|
| 468 | UpdateRatios();
|
---|
[1824] | 469 | }
|
---|
[1884] | 470 |
|
---|
| 471 | void
|
---|
| 472 | MixtureDistribution::Reset()
|
---|
| 473 | {
|
---|
| 474 | for (int i=0; i < mDistributions.size(); i++) {
|
---|
| 475 | // small non-zero value
|
---|
[1891] | 476 | mDistributions[i]->mTotalRays = 0;
|
---|
[1884] | 477 | // unit contribution per ray
|
---|
[1891] | 478 | mDistributions[i]->mTotalContribution = 0.0f;
|
---|
[1884] | 479 | }
|
---|
| 480 | UpdateRatios();
|
---|
| 481 | }
|
---|
| 482 |
|
---|
| 483 | // Generate a new sample according to a mixture distribution
|
---|
[1883] | 484 | bool
|
---|
| 485 | MixtureDistribution::GenerateSample(SimpleRay &ray)
|
---|
| 486 | {
|
---|
[1884] | 487 | float r;
|
---|
[2076] | 488 |
|
---|
[1898] | 489 | sHalton.GetNext(1, &r);
|
---|
[2076] | 490 | //static Halton<1> halton;
|
---|
| 491 | // halton.GetNext(&r);
|
---|
| 492 |
|
---|
[1900] | 493 | int i;
|
---|
[1884] | 494 | // pickup a distribution
|
---|
[2199] | 495 | for (i=0; i < (int)mDistributions.size()-1; i++)
|
---|
[1884] | 496 | if (r < mDistributions[i]->mRatio)
|
---|
| 497 | break;
|
---|
[2199] | 498 |
|
---|
[1966] | 499 | bool result = mDistributions[i]->GenerateSample(ray);
|
---|
| 500 |
|
---|
| 501 | if (result)
|
---|
| 502 | mDistributions[i]->mGeneratedRays++;
|
---|
| 503 |
|
---|
| 504 | return result;
|
---|
[1883] | 505 | }
|
---|
[1824] | 506 |
|
---|
[2353] | 507 |
|
---|
| 508 | #if TEST_PACKETS
|
---|
| 509 |
|
---|
| 510 | // add contributions of the sample to the strategies
|
---|
| 511 | void MixtureDistribution::ComputeContributions(VssRayContainer &vssRays)
|
---|
| 512 | {
|
---|
| 513 | int i;
|
---|
| 514 |
|
---|
| 515 | mPreprocessor.mViewCellsManager->ComputeSampleContributions(vssRays, true, false);
|
---|
| 516 |
|
---|
| 517 | VssRayContainer::iterator it = vssRays.begin();
|
---|
| 518 |
|
---|
| 519 | for (i=0; i < mDistributions.size(); i++) {
|
---|
| 520 | mDistributions[i]->mContribution = 0;
|
---|
| 521 | mDistributions[i]->mRays = 0;
|
---|
| 522 | }
|
---|
| 523 |
|
---|
| 524 | for(; it != vssRays.end(); ++ it)
|
---|
| 525 | {
|
---|
| 526 | VssRay *ray = *it;
|
---|
| 527 |
|
---|
| 528 | for (i = 0; i < mDistributions.size() - 1; ++ i)
|
---|
| 529 | {
|
---|
| 530 | if (mDistributions[i]->mType == ray->mDistribution)
|
---|
| 531 | break;
|
---|
| 532 | }
|
---|
| 533 |
|
---|
| 534 | float contribution =
|
---|
| 535 | mPreprocessor.mViewCellsManager->ComputeSampleContribution(*ray, true, false);
|
---|
| 536 |
|
---|
| 537 | mDistributions[i]->mContribution += contribution;
|
---|
| 538 | mDistributions[i]->mRays ++;
|
---|
| 539 |
|
---|
| 540 | mDistributions[i]->mTotalContribution += contribution;
|
---|
| 541 | mDistributions[i]->mTotalRays ++;
|
---|
| 542 | }
|
---|
| 543 |
|
---|
| 544 | UpdateRatios();
|
---|
| 545 |
|
---|
| 546 |
|
---|
| 547 | const float vcTime = viewCellCastTimer.TotalTime();
|
---|
| 548 | const float pvsTime = pvsTimer.TotalTime();
|
---|
| 549 | const float haltonTime = haltonTimer.TotalTime();
|
---|
| 550 |
|
---|
| 551 | cout << "view cell cast time: " << vcTime << " s" << endl;
|
---|
| 552 | cout << "pvs time: " << pvsTime << " s" << endl;
|
---|
| 553 | cout << "halton time: "<< haltonTime << " s" << endl;
|
---|
| 554 |
|
---|
| 555 | Debug << "view cell cast time: " << vcTime << " s" << endl;
|
---|
| 556 | Debug << "pvs time: " << pvsTime << " s" << endl;
|
---|
| 557 | Debug << "halton time: "<< haltonTime << " s" << endl;
|
---|
| 558 | }
|
---|
| 559 |
|
---|
| 560 |
|
---|
| 561 | #else
|
---|
| 562 |
|
---|
| 563 | // add contributions of the sample to the strategies
|
---|
[1883] | 564 | void
|
---|
[1884] | 565 | MixtureDistribution::ComputeContributions(VssRayContainer &vssRays)
|
---|
[1883] | 566 | {
|
---|
[2353] | 567 | int i;
|
---|
[1883] | 568 |
|
---|
[2353] | 569 | VssRayContainer::iterator it = vssRays.begin();
|
---|
[1891] | 570 |
|
---|
[2353] | 571 | for (i=0; i < mDistributions.size(); i++) {
|
---|
| 572 | mDistributions[i]->mContribution = 0;
|
---|
| 573 | mDistributions[i]->mRays = 0;
|
---|
[1891] | 574 | }
|
---|
[1931] | 575 |
|
---|
[2353] | 576 | for(; it != vssRays.end(); ++it) {
|
---|
| 577 | VssRay *ray = *it;
|
---|
| 578 | for (i=0; i < mDistributions.size()-1; i++) {
|
---|
| 579 | if (mDistributions[i]->mType == ray->mDistribution)
|
---|
| 580 | break;
|
---|
| 581 | }
|
---|
[1884] | 582 |
|
---|
[2353] | 583 | float contribution =
|
---|
| 584 | mPreprocessor.mViewCellsManager->ComputeSampleContribution(*ray,
|
---|
| 585 | true,
|
---|
| 586 | false);
|
---|
[2044] | 587 |
|
---|
[2353] | 588 | mDistributions[i]->mContribution += contribution;
|
---|
| 589 | mDistributions[i]->mRays ++;
|
---|
[1966] | 590 |
|
---|
[2353] | 591 | mDistributions[i]->mTotalContribution += contribution;
|
---|
| 592 | mDistributions[i]->mTotalRays ++;
|
---|
| 593 | }
|
---|
[2116] | 594 |
|
---|
[2353] | 595 | UpdateRatios();
|
---|
[2116] | 596 |
|
---|
[2353] | 597 |
|
---|
| 598 | if (1)
|
---|
| 599 | {
|
---|
[2575] | 600 | #ifdef PERFTIMER
|
---|
[2353] | 601 | const float vcTime = viewCellCastTimer.TotalTime();
|
---|
| 602 | const float pvsTime = pvsTimer.TotalTime();
|
---|
| 603 | const float haltonTime = haltonTimer.TotalTime();
|
---|
[2575] | 604 |
|
---|
[2353] | 605 | cout << "view cell cast time: " << vcTime << " s" << endl;
|
---|
| 606 | cout << "pvs time: " << pvsTime << " s" << endl;
|
---|
| 607 | cout << "halton time: "<< haltonTime << " s" << endl;
|
---|
| 608 |
|
---|
| 609 | Debug << "view cell cast time: " << vcTime << " s" << endl;
|
---|
| 610 | Debug << "pvs time: " << pvsTime << " s" << endl;
|
---|
| 611 | Debug << "halton time: "<< haltonTime << " s" << endl;
|
---|
[2575] | 612 | #else
|
---|
| 613 | cout << "Timers not supported" << endl;
|
---|
| 614 | Debug << "Timers for PVS,Halton,Viewcell not supported" << endl;
|
---|
| 615 | #endif
|
---|
[2353] | 616 | }
|
---|
[1883] | 617 | }
|
---|
| 618 |
|
---|
[2353] | 619 | #endif
|
---|
| 620 |
|
---|
| 621 |
|
---|
[1884] | 622 | void
|
---|
[1942] | 623 | MixtureDistribution::UpdateDistributions(VssRayContainer &vssRays)
|
---|
| 624 | {
|
---|
| 625 | // now update the distributions with all the rays
|
---|
| 626 | for (int i=0; i < mDistributions.size(); i++) {
|
---|
| 627 | mDistributions[i]->Update(vssRays);
|
---|
| 628 | }
|
---|
| 629 | }
|
---|
[1966] | 630 |
|
---|
[1974] | 631 | #define RAY_CAST_TIME 0.7f
|
---|
| 632 | #define VIEWCELL_CAST_TIME 0.3f
|
---|
[1966] | 633 |
|
---|
[1942] | 634 | void
|
---|
[1884] | 635 | MixtureDistribution::UpdateRatios()
|
---|
| 636 | {
|
---|
| 637 | // now compute importance (ratio) of all distributions
|
---|
| 638 | float sum = 0.0f;
|
---|
| 639 | int i;
|
---|
| 640 | for (i=0; i < mDistributions.size(); i++) {
|
---|
[1891] | 641 | cout<<i<<": c="<<mDistributions[i]->mContribution<<
|
---|
| 642 | " rays="<<mDistributions[i]->mRays<<endl;
|
---|
| 643 | float importance = 0.0f;
|
---|
| 644 | if (mDistributions[i]->mRays != 0) {
|
---|
[1966] | 645 | //importance = pow(mDistributions[i]->mContribution/mDistributions[i]->mRays, 2);
|
---|
| 646 | importance = mDistributions[i]->mContribution/
|
---|
| 647 | (RAY_CAST_TIME*mDistributions[i]->mGeneratedRays +
|
---|
| 648 | VIEWCELL_CAST_TIME*mDistributions[i]->mRays);
|
---|
[1891] | 649 | }
|
---|
[1884] | 650 | mDistributions[i]->mRatio = importance;
|
---|
| 651 | sum += importance;
|
---|
| 652 | }
|
---|
[1891] | 653 |
|
---|
[1966] | 654 | if (sum == 0.0f)
|
---|
| 655 | sum = Limits::Small;
|
---|
[1974] | 656 |
|
---|
[1966] | 657 | const float minratio = 0.01f;
|
---|
[1974] | 658 |
|
---|
| 659 | for (i=0; i < mDistributions.size(); i++) {
|
---|
| 660 | mDistributions[i]->mRatio /= sum;
|
---|
| 661 | if (mDistributions[i]->mRatio < minratio)
|
---|
| 662 | mDistributions[i]->mRatio = minratio;
|
---|
| 663 | }
|
---|
[1966] | 664 |
|
---|
[1974] | 665 | // recaluate the sum after clip
|
---|
[1966] | 666 | sum = 0.0f;
|
---|
[1974] | 667 | for (i=0; i < mDistributions.size(); i++)
|
---|
[1966] | 668 | sum += mDistributions[i]->mRatio;
|
---|
[1974] | 669 |
|
---|
| 670 | for (i=0; i < mDistributions.size(); i++)
|
---|
| 671 | mDistributions[i]->mRatio /= sum;
|
---|
[1884] | 672 |
|
---|
| 673 | for (i=1; i < mDistributions.size(); i++) {
|
---|
[1974] | 674 | mDistributions[i]->mRatio = mDistributions[i-1]->mRatio + mDistributions[i]->mRatio;
|
---|
[1884] | 675 | }
|
---|
| 676 |
|
---|
| 677 | cout<<"ratios: ";
|
---|
[1931] | 678 | float last = 0.0f;
|
---|
| 679 | for (i=0; i < mDistributions.size(); i++) {
|
---|
| 680 | cout<<mDistributions[i]->mRatio-last<<" ";
|
---|
| 681 | last = mDistributions[i]->mRatio;
|
---|
| 682 | }
|
---|
[1884] | 683 | cout<<endl;
|
---|
[1883] | 684 | }
|
---|
[1891] | 685 |
|
---|
| 686 |
|
---|
| 687 |
|
---|
| 688 | bool
|
---|
| 689 | MixtureDistribution::Construct(char *str)
|
---|
| 690 | {
|
---|
| 691 | char *curr = str;
|
---|
| 692 |
|
---|
| 693 | while (1) {
|
---|
| 694 | char *e = strchr(curr,'+');
|
---|
| 695 | if (e!=NULL) {
|
---|
| 696 | *e=0;
|
---|
| 697 | }
|
---|
| 698 |
|
---|
| 699 | if (strcmp(curr, "rss")==0) {
|
---|
| 700 | mDistributions.push_back(new RssBasedDistribution(mPreprocessor));
|
---|
| 701 | } else
|
---|
| 702 | if (strcmp(curr, "object")==0) {
|
---|
| 703 | mDistributions.push_back(new ObjectBasedDistribution(mPreprocessor));
|
---|
| 704 | } else
|
---|
| 705 | if (strcmp(curr, "spatial")==0) {
|
---|
| 706 | mDistributions.push_back(new SpatialBoxBasedDistribution(mPreprocessor));
|
---|
| 707 | } else
|
---|
| 708 | if (strcmp(curr, "global")==0) {
|
---|
| 709 | mDistributions.push_back(new GlobalLinesDistribution(mPreprocessor));
|
---|
| 710 | } else
|
---|
| 711 | if (strcmp(curr, "direction")==0) {
|
---|
| 712 | mDistributions.push_back(new DirectionBasedDistribution(mPreprocessor));
|
---|
| 713 | } else
|
---|
| 714 | if (strcmp(curr, "object_direction")==0) {
|
---|
| 715 | mDistributions.push_back(new ObjectDirectionBasedDistribution(mPreprocessor));
|
---|
| 716 | } else
|
---|
| 717 | if (strcmp(curr, "reverse_object")==0) {
|
---|
| 718 | mDistributions.push_back(new ReverseObjectBasedDistribution(mPreprocessor));
|
---|
| 719 | } else
|
---|
[2044] | 720 |
|
---|
[1891] | 721 | if (strcmp(curr, "reverse_viewspace_border")==0) {
|
---|
| 722 | mDistributions.push_back(new ReverseViewSpaceBorderBasedDistribution(mPreprocessor));
|
---|
[1952] | 723 | } else
|
---|
| 724 | if (strcmp(curr, "mutation")==0) {
|
---|
[2048] | 725 | mDistributions.push_back(new MutationBasedDistribution(mPreprocessor));
|
---|
[2575] | 726 | } else
|
---|
| 727 | if (strcmp(curr, "filter_based")==0) {
|
---|
| 728 | mDistributions.push_back(new FilterBasedDistribution(mPreprocessor));
|
---|
| 729 | }
|
---|
[2548] | 730 | else if (strcmp(curr, "difference")==0) {
|
---|
| 731 | mDistributions.push_back(new DifferenceSampling(mPreprocessor));
|
---|
| 732 | }
|
---|
[1891] | 733 |
|
---|
[1952] | 734 |
|
---|
[2575] | 735 |
|
---|
[1891] | 736 | if (e==NULL)
|
---|
| 737 | break;
|
---|
| 738 | curr = e+1;
|
---|
| 739 | }
|
---|
| 740 |
|
---|
| 741 | Init();
|
---|
| 742 | return true;
|
---|
[1884] | 743 | }
|
---|
[1883] | 744 |
|
---|
[1966] | 745 | int
|
---|
| 746 | MixtureDistribution::GenerateSamples(const int number,
|
---|
| 747 | SimpleRayContainer &rays)
|
---|
| 748 | {
|
---|
| 749 | for (int i=0; i < mDistributions.size(); i++)
|
---|
| 750 | mDistributions[i]->mGeneratedRays = 0;
|
---|
[1952] | 751 |
|
---|
[1966] | 752 | return SamplingStrategy::GenerateSamples(number, rays);
|
---|
| 753 | }
|
---|
[1952] | 754 |
|
---|
[1974] | 755 |
|
---|
[2076] | 756 | HwGlobalLinesDistribution::HwGlobalLinesDistribution(Preprocessor &preprocessor):
|
---|
| 757 | SamplingStrategy(preprocessor)
|
---|
| 758 | {
|
---|
| 759 | mType = HW_GLOBAL_LINES_DISTRIBUTION;
|
---|
| 760 | preprocessor.mUseHwGlobalLines = true;
|
---|
| 761 | }
|
---|
[1966] | 762 |
|
---|
[2210] | 763 |
|
---|
[1968] | 764 | bool HwGlobalLinesDistribution::GenerateSample(SimpleRay &ray)
|
---|
| 765 | {
|
---|
| 766 | Vector3 origin, termination, direction;
|
---|
| 767 |
|
---|
[2566] | 768 | const float radius = 0.5f *
|
---|
[1968] | 769 | Magnitude(mPreprocessor.mViewCellsManager->GetViewSpaceBox().Size());
|
---|
| 770 |
|
---|
| 771 | Vector3 center = mPreprocessor.mViewCellsManager->GetViewSpaceBox().Center();
|
---|
| 772 |
|
---|
| 773 | const int tries = 1000;
|
---|
| 774 | int i;
|
---|
| 775 | for (i=0; i < tries; i++)
|
---|
| 776 | {
|
---|
| 777 | float r[2];
|
---|
| 778 | sHalton.GetNext(2, r);
|
---|
| 779 |
|
---|
| 780 | origin = center + (radius * UniformRandomVector(r[0], r[1]));
|
---|
| 781 | termination = center;
|
---|
| 782 |
|
---|
| 783 | if (0)
|
---|
| 784 | {
|
---|
| 785 | // add a small offset to provide some more randomness in the sampling
|
---|
| 786 | Vector3 offset(Random(radius * 1e-3f),
|
---|
| 787 | Random(radius * 1e-3f),
|
---|
| 788 | Random(radius * 1e-3f));
|
---|
| 789 | termination += offset;
|
---|
| 790 | }
|
---|
| 791 |
|
---|
| 792 | direction = termination - origin;
|
---|
| 793 |
|
---|
| 794 | // $$ jb the pdf is yet not correct for all sampling methods!
|
---|
| 795 | const float c = Magnitude(direction);
|
---|
| 796 |
|
---|
| 797 | if (c <= Limits::Small)
|
---|
| 798 | return false;
|
---|
| 799 |
|
---|
| 800 | direction *= 1.0f / c;
|
---|
| 801 |
|
---|
| 802 | // check if the ray intersects the view space box
|
---|
| 803 | static Ray ray;
|
---|
| 804 | ray.Init(origin, direction, Ray::LOCAL_RAY);
|
---|
| 805 |
|
---|
| 806 | float tmin, tmax;
|
---|
| 807 | if (mPreprocessor.mViewCellsManager->
|
---|
| 808 | GetViewSpaceBox().ComputeMinMaxT(ray, &tmin, &tmax) && (tmin < tmax))
|
---|
| 809 | break;
|
---|
| 810 | }
|
---|
| 811 |
|
---|
| 812 | if (i != tries)
|
---|
| 813 | {
|
---|
| 814 | // $$ jb the pdf is yet not correct for all sampling methods!
|
---|
| 815 | const float pdf = 1.0f;
|
---|
| 816 |
|
---|
| 817 | ray = SimpleRay(origin, direction, HW_GLOBAL_LINES_DISTRIBUTION, pdf);
|
---|
| 818 | ray.mType = Ray::GLOBAL_RAY;
|
---|
| 819 | return true;
|
---|
| 820 | }
|
---|
| 821 |
|
---|
| 822 | return false;
|
---|
[1952] | 823 | }
|
---|
| 824 |
|
---|
| 825 |
|
---|
[1996] | 826 | bool ViewCellBasedDistribution::GenerateSample(SimpleRay &ray)
|
---|
| 827 | {
|
---|
| 828 | Vector3 origin, direction;
|
---|
| 829 |
|
---|
| 830 | ViewCellContainer &viewCells =
|
---|
| 831 | mPreprocessor.mViewCellsManager->GetViewCells();
|
---|
| 832 |
|
---|
| 833 | Vector3 point;
|
---|
[2003] | 834 | Vector3 normal;
|
---|
| 835 |
|
---|
| 836 | //Vector normalObj;
|
---|
[2000] | 837 | // float r[1];
|
---|
| 838 | // sHalton.GetNext(1, r);
|
---|
| 839 | // const int objIdx = (int)(r[0] * (float)mPreprocessor.mObjects.size() - 1.0f);
|
---|
| 840 | // Intersectable *object = mPreprocessor.mObjects[objIdx];
|
---|
| 841 | // object->GetRandomSurfacePoint(point, normal);
|
---|
| 842 | // cout << "obj: " << objIdx << endl;
|
---|
[1996] | 843 |
|
---|
[2000] | 844 | float r[2];
|
---|
| 845 | sHalton.GetNext(2, r);
|
---|
[1996] | 846 |
|
---|
[2000] | 847 | direction = UniformRandomVector(r[0], r[1]);
|
---|
| 848 | const float c = Magnitude(direction);
|
---|
[1996] | 849 |
|
---|
[2000] | 850 | if (c <= Limits::Small)
|
---|
| 851 | return false;
|
---|
| 852 |
|
---|
| 853 | direction *= 1.0f / c;
|
---|
| 854 |
|
---|
| 855 | // get point on view cell surface
|
---|
[2003] | 856 | mViewCell->GetRandomSurfacePoint(origin, normal);
|
---|
[1996] | 857 |
|
---|
[2000] | 858 | //direction = point - origin;
|
---|
[1996] | 859 |
|
---|
| 860 | // move a little bit back to avoid piercing through walls
|
---|
| 861 | // that bound the view cell
|
---|
[2003] | 862 | origin -= 0.01f * normal;
|
---|
[1996] | 863 |
|
---|
| 864 | // $$ jb the pdf is yet not correct for all sampling methods!
|
---|
| 865 | const float pdf = 1.0f;
|
---|
| 866 |
|
---|
| 867 | ray = SimpleRay(origin, direction, VIEWCELL_BASED_DISTRIBUTION, pdf);
|
---|
| 868 |
|
---|
| 869 | //cout << "ray: " << ray.mOrigin << " " << ray.mDirection << endl;
|
---|
| 870 |
|
---|
| 871 | return true;
|
---|
[1968] | 872 | }
|
---|
| 873 |
|
---|
| 874 |
|
---|
[1996] | 875 | }
|
---|
| 876 |
|
---|
| 877 |
|
---|