[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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[2580] | 10 | #if TODO
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[2575] | 11 | #include "FilterBasedDistribution.h"
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[2580] | 12 | #endif
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[2548] | 13 | #include "DifferenceSampling.h"
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[1020] | 14 |
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[2069] | 15 |
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[2575] | 16 | #ifdef PERFTIMER
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| 17 | #include "Timer/PerfTimer.h"
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| 18 | #endif
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[2548] | 19 |
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[1020] | 20 | namespace GtpVisibilityPreprocessor {
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| 21 |
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[2575] | 22 |
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| 23 | #ifdef PERFTIMER
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[2076] | 24 | extern PerfTimer haltonTimer;
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[2044] | 25 | extern PerfTimer pvsTimer;
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| 26 | extern PerfTimer viewCellCastTimer;
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[2575] | 27 | #endif
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| 28 |
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[1901] | 29 | //HaltonSequence SamplingStrategy::sHalton;
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| 30 |
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[1899] | 31 | HaltonSequence ObjectBasedDistribution::sHalton;
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| 32 | HaltonSequence MixtureDistribution::sHalton;
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| 33 | HaltonSequence GlobalLinesDistribution::sHalton;
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| 34 | HaltonSequence SpatialBoxBasedDistribution::sHalton;
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| 35 | HaltonSequence ObjectDirectionBasedDistribution::sHalton;
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[1952] | 36 | HaltonSequence DirectionBasedDistribution::sHalton;
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[1968] | 37 | HaltonSequence HwGlobalLinesDistribution::sHalton;
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[1899] | 38 |
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[1996] | 39 | HaltonSequence ViewCellBasedDistribution::sHalton;
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[1899] | 40 |
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[1884] | 41 | SamplingStrategy::SamplingStrategy(Preprocessor &preprocessor):
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[1968] | 42 | mPreprocessor(preprocessor),
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| 43 | mRatio(1.0f),
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| 44 | mTotalRays(0),
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| 45 | mTotalContribution(0.0f)
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| 46 | {
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[1520] | 47 | }
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| 48 |
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| 49 |
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| 50 | SamplingStrategy::~SamplingStrategy()
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| 51 | {
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| 52 | }
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| 53 |
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[1771] | 54 | int
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| 55 | SamplingStrategy::GenerateSamples(const int number,
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[1867] | 56 | SimpleRayContainer &rays)
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[1771] | 57 | {
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[1772] | 58 | SimpleRay ray;
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| 59 | int samples = 0;
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| 60 | int i = 0;
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| 61 | const int maxTries = 20;
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| 62 | // tmp changed matt. Q: should one rejected sample
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| 63 | // terminate the whole method?
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[1989] | 64 | for (; i < number; i++)
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[2187] | 65 | {
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[1989] | 66 | int j = 0;
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| 67 | bool sampleGenerated = false;
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[2187] | 68 |
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[1989] | 69 | for (j = 0; !sampleGenerated && (j < maxTries); ++ j)
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[2187] | 70 | {
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[1989] | 71 | sampleGenerated = GenerateSample(ray);
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[2187] | 72 |
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[1989] | 73 | if (sampleGenerated)
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[2187] | 74 | {
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[1989] | 75 | ++ samples;
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| 76 | rays.push_back(ray);
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[2187] | 77 | }
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| 78 | }
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| 79 | }
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[1520] | 80 |
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[1772] | 81 | return samples;
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[1771] | 82 | }
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[1520] | 83 |
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[1771] | 84 |
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[1020] | 85 | /*********************************************************************/
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| 86 | /* Individual sampling strategies implementation */
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| 87 | /*********************************************************************/
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| 88 |
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| 89 |
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[1867] | 90 | bool ObjectBasedDistribution::GenerateSample(SimpleRay &ray)
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[1020] | 91 | {
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[1883] | 92 | Vector3 origin, direction;
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| 93 |
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| 94 | float r[5];
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[1898] | 95 | sHalton.GetNext(5, r);
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[1883] | 96 |
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| 97 | mPreprocessor.mViewCellsManager->GetViewPoint(origin,
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| 98 | Vector3(r[2],r[3],r[4]));
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| 99 |
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[1020] | 100 |
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[1883] | 101 | Vector3 point, normal;
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| 102 |
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[1898] | 103 | r[0] *= (float)mPreprocessor.mObjects.size() - 1;
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[1883] | 104 | const int i = (int)r[0];
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| 105 |
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| 106 | Intersectable *object = mPreprocessor.mObjects[i];
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| 107 |
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| 108 | // take the remainder as a parameter over objects surface
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| 109 | r[0] -= (float)i;
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| 110 |
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| 111 | object->GetRandomSurfacePoint(r[0], r[1], point, normal);
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| 112 |
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| 113 | direction = point - origin;
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| 114 |
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| 115 | const float c = Magnitude(direction);
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| 116 |
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| 117 | if (c <= Limits::Small)
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| 118 | return false;
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| 119 |
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| 120 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 121 | const float pdf = 1.0f;
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| 122 |
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| 123 | direction *= 1.0f / c;
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| 124 | ray = SimpleRay(origin, direction, OBJECT_BASED_DISTRIBUTION, pdf);
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| 125 |
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| 126 | return true;
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| 127 | }
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[1020] | 128 |
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| 129 |
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[1883] | 130 | bool
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| 131 | ObjectDirectionBasedDistribution::GenerateSample(SimpleRay &ray)
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| 132 | {
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| 133 | Vector3 origin, direction;
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[1877] | 134 |
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[1020] | 135 |
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[1883] | 136 | float r[4];
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[1898] | 137 | sHalton.GetNext(4, r);
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[1877] | 138 |
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[2076] | 139 | // static Halton<4> halton;
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| 140 | // halton.GetNext(r);
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| 141 |
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[1901] | 142 | r[0] *= (float)mPreprocessor.mObjects.size() - 1;
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[1883] | 143 | const int i = (int)r[0];
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| 144 |
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| 145 | Intersectable *object = mPreprocessor.mObjects[i];
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| 146 |
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| 147 | // take the remainder as a parameter over objects surface
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| 148 | r[0] -= (float)i;
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[1020] | 149 |
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[1883] | 150 | Vector3 normal;
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[1020] | 151 |
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[1883] | 152 | object->GetRandomSurfacePoint(r[0], r[1], origin, normal);
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| 153 |
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| 154 | direction = Normalize(CosineRandomVector(r[2], r[3], normal));
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| 155 |
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[1899] | 156 | origin += 1e-2f*direction;
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[1883] | 157 |
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| 158 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 159 | const float pdf = 1.0f;
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| 160 |
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| 161 | ray = SimpleRay(origin, direction, OBJECT_DIRECTION_BASED_DISTRIBUTION, pdf);
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| 162 |
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| 163 | return true;
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[1020] | 164 | }
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| 165 |
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| 166 |
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[1867] | 167 | bool DirectionBasedDistribution::GenerateSample(SimpleRay &ray)
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[1278] | 168 | {
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[1020] | 169 |
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[1952] | 170 | float r[5];
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| 171 | sHalton.GetNext(5, r);
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[1020] | 172 |
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[1952] | 173 | Vector3 origin, direction;
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| 174 | mPreprocessor.mViewCellsManager->GetViewPoint(origin,
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| 175 | Vector3(r[2],r[3],r[4])
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| 176 | );
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| 177 |
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| 178 | direction = UniformRandomVector(r[0], r[1]);
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| 179 | const float c = Magnitude(direction);
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| 180 |
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| 181 | if (c <= Limits::Small)
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| 182 | return false;
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| 183 |
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| 184 | const float pdf = 1.0f;
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| 185 |
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| 186 | direction *= 1.0f / c;
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| 187 | ray = SimpleRay(origin, direction, DIRECTION_BASED_DISTRIBUTION, pdf);
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| 188 |
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| 189 | return true;
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[1020] | 190 | }
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| 191 |
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| 192 |
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[1867] | 193 | bool DirectionBoxBasedDistribution::GenerateSample(SimpleRay &ray)
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[1020] | 194 | {
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| 195 | Vector3 origin, direction;
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| 196 | mPreprocessor.mViewCellsManager->GetViewPoint(origin);
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| 197 |
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[1297] | 198 | const float alpha = RandomValue(0.0f, 2.0f * (float)M_PI);
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| 199 | const float beta = RandomValue((float)-M_PI * 0.5f, (float)M_PI * 0.5f);
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[1020] | 200 |
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| 201 | direction = VssRay::GetDirection(alpha, beta);
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| 202 |
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| 203 | const float c = Magnitude(direction);
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| 204 |
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| 205 | if (c <= Limits::Small)
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| 206 | return false;
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| 207 |
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| 208 | const float pdf = 1.0f;
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| 209 |
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| 210 | direction *= 1.0f / c;
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[1883] | 211 | ray = SimpleRay(origin, direction, DIRECTION_BOX_BASED_DISTRIBUTION, pdf);
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[1020] | 212 |
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| 213 | return true;
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| 214 | }
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| 215 |
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| 216 |
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[1867] | 217 | bool SpatialBoxBasedDistribution::GenerateSample(SimpleRay &ray)
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[1020] | 218 | {
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[2071] | 219 |
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[2072] | 220 | Vector3 origin, direction;
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[1278] | 221 |
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[2072] | 222 | float r[6];
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| 223 | sHalton.GetNext(6, r);
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[2199] | 224 |
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[2076] | 225 | mPreprocessor.mViewCellsManager->GetViewPoint(origin, Vector3(r[0],
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| 226 | r[1],
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| 227 | r[2]));
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[2072] | 228 |
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| 229 | direction = mPreprocessor.mKdTree->GetBox().GetRandomPoint(Vector3(r[3],
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| 230 | r[4],
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| 231 | r[5])
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[2575] | 232 | ) - origin;
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[2199] | 233 |
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[2072] | 234 | const float c = Magnitude(direction);
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| 235 |
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| 236 | if (c <= Limits::Small)
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| 237 | return false;
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| 238 |
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| 239 | const float pdf = 1.0f;
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| 240 |
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| 241 | direction *= 1.0f / c;
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| 242 | ray = SimpleRay(origin, direction, SPATIAL_BOX_BASED_DISTRIBUTION, pdf);
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[1867] | 243 |
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[2072] | 244 | return true;
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[1020] | 245 | }
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| 246 |
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[1695] | 247 |
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[1867] | 248 | bool ReverseObjectBasedDistribution::GenerateSample(SimpleRay &ray)
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[1695] | 249 | {
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| 250 | Vector3 origin, direction;
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| 251 |
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| 252 | mPreprocessor.mViewCellsManager->GetViewPoint(origin);
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| 253 |
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| 254 | Vector3 point;
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| 255 | Vector3 normal;
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[1999] | 256 |
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[1695] | 257 | const int i = (int)RandomValue(0, (float)mPreprocessor.mObjects.size() - 0.5f);
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| 258 |
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| 259 | Intersectable *object = mPreprocessor.mObjects[i];
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| 260 |
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| 261 | object->GetRandomSurfacePoint(point, normal);
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[1765] | 262 |
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[1695] | 263 | direction = origin - point;
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[1765] | 264 |
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[1695] | 265 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 266 | const float c = Magnitude(direction);
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[1765] | 267 |
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| 268 | if ((c <= Limits::Small) || (DotProd(direction, normal) < 0))
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| 269 | {
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[1695] | 270 | return false;
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[1765] | 271 | }
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[1695] | 272 |
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| 273 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 274 | const float pdf = 1.0f;
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[2072] | 275 |
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[1695] | 276 | direction *= 1.0f / c;
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[1765] | 277 | // a little offset
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[1772] | 278 | point += direction * 0.001f;
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[1765] | 279 |
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[1883] | 280 | ray = SimpleRay(point, direction, REVERSE_OBJECT_BASED_DISTRIBUTION, pdf);
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[1695] | 281 |
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| 282 | return true;
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| 283 | }
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| 284 |
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[1763] | 285 |
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[1867] | 286 | bool ViewCellBorderBasedDistribution::GenerateSample(SimpleRay &ray)
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[1763] | 287 | {
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| 288 | Vector3 origin, direction;
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| 289 |
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| 290 | ViewCellContainer &viewCells = mPreprocessor.mViewCellsManager->GetViewCells();
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| 291 |
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| 292 | Vector3 point;
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| 293 | Vector3 normal, normal2;
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| 294 |
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| 295 | const int vcIdx = (int)RandomValue(0, (float)viewCells.size() - 0.5f);
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| 296 | const int objIdx = (int)RandomValue(0, (float)mPreprocessor.mObjects.size() - 0.5f);
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| 297 |
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| 298 | Intersectable *object = mPreprocessor.mObjects[objIdx];
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| 299 | ViewCell *viewCell = viewCells[vcIdx];
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| 300 |
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| 301 | object->GetRandomSurfacePoint(point, normal);
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| 302 | viewCell->GetRandomEdgePoint(origin, normal2);
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| 303 |
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| 304 | direction = point - origin;
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| 305 |
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| 306 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 307 | const float c = Magnitude(direction);
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| 308 |
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[1769] | 309 | if ((c <= Limits::Small) /*|| (DotProd(direction, normal) < 0)*/)
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[1768] | 310 | {
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[1763] | 311 | return false;
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[1768] | 312 | }
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[1763] | 313 |
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| 314 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 315 | const float pdf = 1.0f;
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| 316 | //cout << "p: " << point << " ";
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| 317 | direction *= 1.0f / c;
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[1883] | 318 | ray = SimpleRay(origin, direction, VIEWCELL_BORDER_BASED_DISTRIBUTION, pdf);
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[1769] | 319 |
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| 320 | //cout << "ray: " << ray.mOrigin << " " << ray.mDirection << endl;
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| 321 |
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[1763] | 322 | return true;
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| 323 | }
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| 324 |
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[1765] | 325 |
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[1867] | 326 | bool ReverseViewSpaceBorderBasedDistribution::GenerateSample(SimpleRay &ray)
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[1772] | 327 | {
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| 328 | Vector3 origin, direction;
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| 329 |
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| 330 | origin = mPreprocessor.mViewCellsManager->GetViewSpaceBox().GetRandomSurfacePoint();
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| 331 |
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| 332 | Vector3 point;
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| 333 | Vector3 normal;
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[1999] | 334 |
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[1772] | 335 | const int i = (int)RandomValue(0, (float)mPreprocessor.mObjects.size() - 0.5f);
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| 336 |
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| 337 | Intersectable *object = mPreprocessor.mObjects[i];
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| 338 |
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| 339 | object->GetRandomSurfacePoint(point, normal);
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| 340 |
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| 341 | direction = origin - point;
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| 342 |
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| 343 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 344 | const float c = Magnitude(direction);
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| 345 |
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| 346 | if ((c <= Limits::Small) || (DotProd(direction, normal) < 0))
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| 347 | {
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| 348 | return false;
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| 349 | }
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| 350 |
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| 351 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 352 | const float pdf = 1.0f;
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| 353 | //cout << "p: " << point << " ";
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| 354 | direction *= 1.0f / c;
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| 355 | // a little offset
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| 356 | point += direction * 0.001f;
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| 357 |
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[1883] | 358 | ray = SimpleRay(point, direction, REVERSE_VIEWSPACE_BORDER_BASED_DISTRIBUTION, pdf);
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[1772] | 359 |
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| 360 | return true;
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| 361 | }
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| 362 |
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| 363 |
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[1867] | 364 | bool ViewSpaceBorderBasedDistribution::GenerateSample(SimpleRay &ray)
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[1772] | 365 | {
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| 366 | Vector3 origin, direction;
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| 367 |
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| 368 | origin = mPreprocessor.mViewCellsManager->GetViewSpaceBox().GetRandomSurfacePoint();
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| 369 |
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| 370 | Vector3 point;
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| 371 | Vector3 normal;
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[2066] | 372 |
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[1772] | 373 | const int i = (int)RandomValue(0, (float)mPreprocessor.mObjects.size() - 0.5f);
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| 374 |
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| 375 | Intersectable *object = mPreprocessor.mObjects[i];
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| 376 |
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| 377 | object->GetRandomSurfacePoint(point, normal);
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| 378 | direction = point - origin;
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| 379 |
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| 380 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 381 | const float c = Magnitude(direction);
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| 382 |
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| 383 | if (c <= Limits::Small)
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| 384 | return false;
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| 385 |
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| 386 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 387 | const float pdf = 1.0f;
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| 388 |
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| 389 | direction *= 1.0f / c;
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| 390 |
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| 391 | // a little offset
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| 392 | origin += direction * 0.001f;
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| 393 |
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[1883] | 394 | ray = SimpleRay(origin, direction, VIEWSPACE_BORDER_BASED_DISTRIBUTION, pdf);
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[1772] | 395 |
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| 396 | return true;
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| 397 | }
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| 398 |
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| 399 |
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[1824] | 400 | bool
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[1867] | 401 | GlobalLinesDistribution::GenerateSample(SimpleRay &ray)
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[1824] | 402 | {
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[1867] | 403 | Vector3 origin, termination, direction;
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[1824] | 404 |
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[1867] | 405 | float radius = 0.5f*Magnitude(mPreprocessor.mViewCellsManager->GetViewSpaceBox().Size());
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| 406 | Vector3 center = mPreprocessor.mViewCellsManager->GetViewSpaceBox().Center();
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| 407 |
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| 408 | const int tries = 1000;
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| 409 | int i;
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| 410 | for (i=0; i < tries; i++) {
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| 411 | float r[4];
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[1898] | 412 | sHalton.GetNext(4, r);
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[1824] | 413 |
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[1867] | 414 | origin = center + (radius*UniformRandomVector(r[0], r[1]));
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| 415 | termination = center + (radius*UniformRandomVector(r[2], r[3]));
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| 416 |
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[1824] | 417 | direction = termination - origin;
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[1867] | 418 |
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| 419 |
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[1824] | 420 | // $$ jb the pdf is yet not correct for all sampling methods!
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| 421 | const float c = Magnitude(direction);
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| 422 | if (c <= Limits::Small)
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[1867] | 423 | return false;
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[1824] | 424 |
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| 425 | direction *= 1.0f / c;
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[1867] | 426 |
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| 427 | // check if the ray intersects the view space box
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| 428 | static Ray ray;
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| 429 | ray.Init(origin, direction, Ray::LOCAL_RAY);
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[1824] | 430 |
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[1867] | 431 | float tmin, tmax;
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| 432 | if (mPreprocessor.mViewCellsManager->
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| 433 | GetViewSpaceBox().ComputeMinMaxT(ray, &tmin, &tmax) && (tmin < tmax))
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| 434 | break;
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| 435 | }
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| 436 |
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| 437 | if (i!=tries) {
|
---|
[1824] | 438 | // $$ jb the pdf is yet not correct for all sampling methods!
|
---|
| 439 | const float pdf = 1.0f;
|
---|
[1867] | 440 |
|
---|
| 441 |
|
---|
[1883] | 442 | ray = SimpleRay(origin, direction, GLOBAL_LINES_DISTRIBUTION, pdf);
|
---|
[1824] | 443 | ray.mType = Ray::GLOBAL_RAY;
|
---|
| 444 | return true;
|
---|
[1867] | 445 | }
|
---|
| 446 |
|
---|
| 447 | return false;
|
---|
[1771] | 448 | }
|
---|
| 449 |
|
---|
[1883] | 450 |
|
---|
[2210] | 451 | /******************************************************************/
|
---|
| 452 | /* class MixtureDistribution implementation */
|
---|
| 453 | /******************************************************************/
|
---|
| 454 |
|
---|
| 455 |
|
---|
| 456 | // has to be called before first usage
|
---|
[1883] | 457 | void
|
---|
| 458 | MixtureDistribution::Init()
|
---|
| 459 | {
|
---|
[1884] | 460 | for (int i=0; i < mDistributions.size(); i++) {
|
---|
| 461 | // small non-zero value
|
---|
| 462 | mDistributions[i]->mRays = 1;
|
---|
[1966] | 463 | mDistributions[i]->mGeneratedRays = 1;
|
---|
[1884] | 464 | // unit contribution per ray
|
---|
| 465 | if (1 || mDistributions[i]->mType != RSS_BASED_DISTRIBUTION)
|
---|
| 466 | mDistributions[i]->mContribution = 1.0f;
|
---|
| 467 | else
|
---|
| 468 | mDistributions[i]->mContribution = 0.0f;
|
---|
| 469 | }
|
---|
| 470 | UpdateRatios();
|
---|
[1824] | 471 | }
|
---|
[1884] | 472 |
|
---|
| 473 | void
|
---|
| 474 | MixtureDistribution::Reset()
|
---|
| 475 | {
|
---|
| 476 | for (int i=0; i < mDistributions.size(); i++) {
|
---|
| 477 | // small non-zero value
|
---|
[1891] | 478 | mDistributions[i]->mTotalRays = 0;
|
---|
[1884] | 479 | // unit contribution per ray
|
---|
[1891] | 480 | mDistributions[i]->mTotalContribution = 0.0f;
|
---|
[1884] | 481 | }
|
---|
| 482 | UpdateRatios();
|
---|
| 483 | }
|
---|
| 484 |
|
---|
| 485 | // Generate a new sample according to a mixture distribution
|
---|
[1883] | 486 | bool
|
---|
| 487 | MixtureDistribution::GenerateSample(SimpleRay &ray)
|
---|
| 488 | {
|
---|
[1884] | 489 | float r;
|
---|
[2076] | 490 |
|
---|
[1898] | 491 | sHalton.GetNext(1, &r);
|
---|
[2076] | 492 | //static Halton<1> halton;
|
---|
| 493 | // halton.GetNext(&r);
|
---|
| 494 |
|
---|
[1900] | 495 | int i;
|
---|
[1884] | 496 | // pickup a distribution
|
---|
[2199] | 497 | for (i=0; i < (int)mDistributions.size()-1; i++)
|
---|
[1884] | 498 | if (r < mDistributions[i]->mRatio)
|
---|
| 499 | break;
|
---|
[2199] | 500 |
|
---|
[1966] | 501 | bool result = mDistributions[i]->GenerateSample(ray);
|
---|
| 502 |
|
---|
| 503 | if (result)
|
---|
| 504 | mDistributions[i]->mGeneratedRays++;
|
---|
| 505 |
|
---|
| 506 | return result;
|
---|
[1883] | 507 | }
|
---|
[1824] | 508 |
|
---|
[2353] | 509 |
|
---|
| 510 | #if TEST_PACKETS
|
---|
| 511 |
|
---|
| 512 | // add contributions of the sample to the strategies
|
---|
| 513 | void MixtureDistribution::ComputeContributions(VssRayContainer &vssRays)
|
---|
| 514 | {
|
---|
| 515 | int i;
|
---|
| 516 |
|
---|
| 517 | mPreprocessor.mViewCellsManager->ComputeSampleContributions(vssRays, true, false);
|
---|
| 518 |
|
---|
| 519 | VssRayContainer::iterator it = vssRays.begin();
|
---|
| 520 |
|
---|
| 521 | for (i=0; i < mDistributions.size(); i++) {
|
---|
| 522 | mDistributions[i]->mContribution = 0;
|
---|
| 523 | mDistributions[i]->mRays = 0;
|
---|
| 524 | }
|
---|
| 525 |
|
---|
| 526 | for(; it != vssRays.end(); ++ it)
|
---|
| 527 | {
|
---|
| 528 | VssRay *ray = *it;
|
---|
| 529 |
|
---|
| 530 | for (i = 0; i < mDistributions.size() - 1; ++ i)
|
---|
| 531 | {
|
---|
| 532 | if (mDistributions[i]->mType == ray->mDistribution)
|
---|
| 533 | break;
|
---|
| 534 | }
|
---|
| 535 |
|
---|
| 536 | float contribution =
|
---|
| 537 | mPreprocessor.mViewCellsManager->ComputeSampleContribution(*ray, true, false);
|
---|
| 538 |
|
---|
| 539 | mDistributions[i]->mContribution += contribution;
|
---|
| 540 | mDistributions[i]->mRays ++;
|
---|
| 541 |
|
---|
| 542 | mDistributions[i]->mTotalContribution += contribution;
|
---|
| 543 | mDistributions[i]->mTotalRays ++;
|
---|
| 544 | }
|
---|
| 545 |
|
---|
| 546 | UpdateRatios();
|
---|
| 547 |
|
---|
| 548 |
|
---|
| 549 | const float vcTime = viewCellCastTimer.TotalTime();
|
---|
| 550 | const float pvsTime = pvsTimer.TotalTime();
|
---|
| 551 | const float haltonTime = haltonTimer.TotalTime();
|
---|
| 552 |
|
---|
| 553 | cout << "view cell cast time: " << vcTime << " s" << endl;
|
---|
| 554 | cout << "pvs time: " << pvsTime << " s" << endl;
|
---|
| 555 | cout << "halton time: "<< haltonTime << " s" << endl;
|
---|
| 556 |
|
---|
| 557 | Debug << "view cell cast time: " << vcTime << " s" << endl;
|
---|
| 558 | Debug << "pvs time: " << pvsTime << " s" << endl;
|
---|
| 559 | Debug << "halton time: "<< haltonTime << " s" << endl;
|
---|
| 560 | }
|
---|
| 561 |
|
---|
| 562 |
|
---|
| 563 | #else
|
---|
| 564 |
|
---|
| 565 | // add contributions of the sample to the strategies
|
---|
[1883] | 566 | void
|
---|
[1884] | 567 | MixtureDistribution::ComputeContributions(VssRayContainer &vssRays)
|
---|
[1883] | 568 | {
|
---|
[2353] | 569 | int i;
|
---|
[1883] | 570 |
|
---|
[2353] | 571 | VssRayContainer::iterator it = vssRays.begin();
|
---|
[1891] | 572 |
|
---|
[2353] | 573 | for (i=0; i < mDistributions.size(); i++) {
|
---|
| 574 | mDistributions[i]->mContribution = 0;
|
---|
| 575 | mDistributions[i]->mRays = 0;
|
---|
[1891] | 576 | }
|
---|
[1931] | 577 |
|
---|
[2353] | 578 | for(; it != vssRays.end(); ++it) {
|
---|
| 579 | VssRay *ray = *it;
|
---|
| 580 | for (i=0; i < mDistributions.size()-1; i++) {
|
---|
| 581 | if (mDistributions[i]->mType == ray->mDistribution)
|
---|
| 582 | break;
|
---|
| 583 | }
|
---|
[1884] | 584 |
|
---|
[2353] | 585 | float contribution =
|
---|
| 586 | mPreprocessor.mViewCellsManager->ComputeSampleContribution(*ray,
|
---|
| 587 | true,
|
---|
| 588 | false);
|
---|
[2044] | 589 |
|
---|
[2353] | 590 | mDistributions[i]->mContribution += contribution;
|
---|
| 591 | mDistributions[i]->mRays ++;
|
---|
[1966] | 592 |
|
---|
[2353] | 593 | mDistributions[i]->mTotalContribution += contribution;
|
---|
| 594 | mDistributions[i]->mTotalRays ++;
|
---|
| 595 | }
|
---|
[2116] | 596 |
|
---|
[2353] | 597 | UpdateRatios();
|
---|
[2116] | 598 |
|
---|
[2353] | 599 |
|
---|
| 600 | if (1)
|
---|
| 601 | {
|
---|
[2575] | 602 | #ifdef PERFTIMER
|
---|
[2353] | 603 | const float vcTime = viewCellCastTimer.TotalTime();
|
---|
| 604 | const float pvsTime = pvsTimer.TotalTime();
|
---|
| 605 | const float haltonTime = haltonTimer.TotalTime();
|
---|
[2575] | 606 |
|
---|
[2353] | 607 | cout << "view cell cast time: " << vcTime << " s" << endl;
|
---|
| 608 | cout << "pvs time: " << pvsTime << " s" << endl;
|
---|
| 609 | cout << "halton time: "<< haltonTime << " s" << endl;
|
---|
| 610 |
|
---|
| 611 | Debug << "view cell cast time: " << vcTime << " s" << endl;
|
---|
| 612 | Debug << "pvs time: " << pvsTime << " s" << endl;
|
---|
| 613 | Debug << "halton time: "<< haltonTime << " s" << endl;
|
---|
[2575] | 614 | #else
|
---|
| 615 | cout << "Timers not supported" << endl;
|
---|
| 616 | Debug << "Timers for PVS,Halton,Viewcell not supported" << endl;
|
---|
| 617 | #endif
|
---|
[2353] | 618 | }
|
---|
[1883] | 619 | }
|
---|
| 620 |
|
---|
[2353] | 621 | #endif
|
---|
| 622 |
|
---|
| 623 |
|
---|
[1884] | 624 | void
|
---|
[1942] | 625 | MixtureDistribution::UpdateDistributions(VssRayContainer &vssRays)
|
---|
| 626 | {
|
---|
| 627 | // now update the distributions with all the rays
|
---|
| 628 | for (int i=0; i < mDistributions.size(); i++) {
|
---|
| 629 | mDistributions[i]->Update(vssRays);
|
---|
| 630 | }
|
---|
| 631 | }
|
---|
[1966] | 632 |
|
---|
[1974] | 633 | #define RAY_CAST_TIME 0.7f
|
---|
| 634 | #define VIEWCELL_CAST_TIME 0.3f
|
---|
[1966] | 635 |
|
---|
[1942] | 636 | void
|
---|
[1884] | 637 | MixtureDistribution::UpdateRatios()
|
---|
| 638 | {
|
---|
| 639 | // now compute importance (ratio) of all distributions
|
---|
| 640 | float sum = 0.0f;
|
---|
| 641 | int i;
|
---|
| 642 | for (i=0; i < mDistributions.size(); i++) {
|
---|
[1891] | 643 | cout<<i<<": c="<<mDistributions[i]->mContribution<<
|
---|
| 644 | " rays="<<mDistributions[i]->mRays<<endl;
|
---|
| 645 | float importance = 0.0f;
|
---|
| 646 | if (mDistributions[i]->mRays != 0) {
|
---|
[1966] | 647 | //importance = pow(mDistributions[i]->mContribution/mDistributions[i]->mRays, 2);
|
---|
| 648 | importance = mDistributions[i]->mContribution/
|
---|
| 649 | (RAY_CAST_TIME*mDistributions[i]->mGeneratedRays +
|
---|
| 650 | VIEWCELL_CAST_TIME*mDistributions[i]->mRays);
|
---|
[1891] | 651 | }
|
---|
[1884] | 652 | mDistributions[i]->mRatio = importance;
|
---|
| 653 | sum += importance;
|
---|
| 654 | }
|
---|
[1891] | 655 |
|
---|
[1966] | 656 | if (sum == 0.0f)
|
---|
| 657 | sum = Limits::Small;
|
---|
[1974] | 658 |
|
---|
[1966] | 659 | const float minratio = 0.01f;
|
---|
[1974] | 660 |
|
---|
| 661 | for (i=0; i < mDistributions.size(); i++) {
|
---|
| 662 | mDistributions[i]->mRatio /= sum;
|
---|
| 663 | if (mDistributions[i]->mRatio < minratio)
|
---|
| 664 | mDistributions[i]->mRatio = minratio;
|
---|
| 665 | }
|
---|
[1966] | 666 |
|
---|
[1974] | 667 | // recaluate the sum after clip
|
---|
[1966] | 668 | sum = 0.0f;
|
---|
[1974] | 669 | for (i=0; i < mDistributions.size(); i++)
|
---|
[1966] | 670 | sum += mDistributions[i]->mRatio;
|
---|
[1974] | 671 |
|
---|
| 672 | for (i=0; i < mDistributions.size(); i++)
|
---|
| 673 | mDistributions[i]->mRatio /= sum;
|
---|
[1884] | 674 |
|
---|
| 675 | for (i=1; i < mDistributions.size(); i++) {
|
---|
[1974] | 676 | mDistributions[i]->mRatio = mDistributions[i-1]->mRatio + mDistributions[i]->mRatio;
|
---|
[1884] | 677 | }
|
---|
| 678 |
|
---|
| 679 | cout<<"ratios: ";
|
---|
[1931] | 680 | float last = 0.0f;
|
---|
| 681 | for (i=0; i < mDistributions.size(); i++) {
|
---|
| 682 | cout<<mDistributions[i]->mRatio-last<<" ";
|
---|
| 683 | last = mDistributions[i]->mRatio;
|
---|
| 684 | }
|
---|
[1884] | 685 | cout<<endl;
|
---|
[1883] | 686 | }
|
---|
[1891] | 687 |
|
---|
| 688 |
|
---|
| 689 |
|
---|
| 690 | bool
|
---|
| 691 | MixtureDistribution::Construct(char *str)
|
---|
| 692 | {
|
---|
| 693 | char *curr = str;
|
---|
| 694 |
|
---|
| 695 | while (1) {
|
---|
| 696 | char *e = strchr(curr,'+');
|
---|
| 697 | if (e!=NULL) {
|
---|
| 698 | *e=0;
|
---|
| 699 | }
|
---|
| 700 |
|
---|
| 701 | if (strcmp(curr, "rss")==0) {
|
---|
| 702 | mDistributions.push_back(new RssBasedDistribution(mPreprocessor));
|
---|
| 703 | } else
|
---|
| 704 | if (strcmp(curr, "object")==0) {
|
---|
| 705 | mDistributions.push_back(new ObjectBasedDistribution(mPreprocessor));
|
---|
| 706 | } else
|
---|
| 707 | if (strcmp(curr, "spatial")==0) {
|
---|
| 708 | mDistributions.push_back(new SpatialBoxBasedDistribution(mPreprocessor));
|
---|
| 709 | } else
|
---|
| 710 | if (strcmp(curr, "global")==0) {
|
---|
| 711 | mDistributions.push_back(new GlobalLinesDistribution(mPreprocessor));
|
---|
| 712 | } else
|
---|
| 713 | if (strcmp(curr, "direction")==0) {
|
---|
| 714 | mDistributions.push_back(new DirectionBasedDistribution(mPreprocessor));
|
---|
| 715 | } else
|
---|
| 716 | if (strcmp(curr, "object_direction")==0) {
|
---|
| 717 | mDistributions.push_back(new ObjectDirectionBasedDistribution(mPreprocessor));
|
---|
| 718 | } else
|
---|
| 719 | if (strcmp(curr, "reverse_object")==0) {
|
---|
| 720 | mDistributions.push_back(new ReverseObjectBasedDistribution(mPreprocessor));
|
---|
| 721 | } else
|
---|
[2044] | 722 |
|
---|
[1891] | 723 | if (strcmp(curr, "reverse_viewspace_border")==0) {
|
---|
| 724 | mDistributions.push_back(new ReverseViewSpaceBorderBasedDistribution(mPreprocessor));
|
---|
[1952] | 725 | } else
|
---|
| 726 | if (strcmp(curr, "mutation")==0) {
|
---|
[2048] | 727 | mDistributions.push_back(new MutationBasedDistribution(mPreprocessor));
|
---|
[2575] | 728 | } else
|
---|
| 729 | if (strcmp(curr, "filter_based")==0) {
|
---|
[2580] | 730 | #if TODO
|
---|
[2575] | 731 | mDistributions.push_back(new FilterBasedDistribution(mPreprocessor));
|
---|
[2580] | 732 | #endif
|
---|
[2575] | 733 | }
|
---|
[2548] | 734 | else if (strcmp(curr, "difference")==0) {
|
---|
| 735 | mDistributions.push_back(new DifferenceSampling(mPreprocessor));
|
---|
| 736 | }
|
---|
[1891] | 737 |
|
---|
[1952] | 738 |
|
---|
[2575] | 739 |
|
---|
[1891] | 740 | if (e==NULL)
|
---|
| 741 | break;
|
---|
| 742 | curr = e+1;
|
---|
| 743 | }
|
---|
| 744 |
|
---|
| 745 | Init();
|
---|
| 746 | return true;
|
---|
[1884] | 747 | }
|
---|
[1883] | 748 |
|
---|
[1966] | 749 | int
|
---|
| 750 | MixtureDistribution::GenerateSamples(const int number,
|
---|
| 751 | SimpleRayContainer &rays)
|
---|
| 752 | {
|
---|
| 753 | for (int i=0; i < mDistributions.size(); i++)
|
---|
| 754 | mDistributions[i]->mGeneratedRays = 0;
|
---|
[1952] | 755 |
|
---|
[1966] | 756 | return SamplingStrategy::GenerateSamples(number, rays);
|
---|
| 757 | }
|
---|
[1952] | 758 |
|
---|
[1974] | 759 |
|
---|
[2076] | 760 | HwGlobalLinesDistribution::HwGlobalLinesDistribution(Preprocessor &preprocessor):
|
---|
| 761 | SamplingStrategy(preprocessor)
|
---|
| 762 | {
|
---|
| 763 | mType = HW_GLOBAL_LINES_DISTRIBUTION;
|
---|
| 764 | preprocessor.mUseHwGlobalLines = true;
|
---|
| 765 | }
|
---|
[1966] | 766 |
|
---|
[2210] | 767 |
|
---|
[1968] | 768 | bool HwGlobalLinesDistribution::GenerateSample(SimpleRay &ray)
|
---|
| 769 | {
|
---|
| 770 | Vector3 origin, termination, direction;
|
---|
| 771 |
|
---|
[2566] | 772 | const float radius = 0.5f *
|
---|
[1968] | 773 | Magnitude(mPreprocessor.mViewCellsManager->GetViewSpaceBox().Size());
|
---|
| 774 |
|
---|
| 775 | Vector3 center = mPreprocessor.mViewCellsManager->GetViewSpaceBox().Center();
|
---|
| 776 |
|
---|
| 777 | const int tries = 1000;
|
---|
| 778 | int i;
|
---|
| 779 | for (i=0; i < tries; i++)
|
---|
| 780 | {
|
---|
| 781 | float r[2];
|
---|
| 782 | sHalton.GetNext(2, r);
|
---|
| 783 |
|
---|
| 784 | origin = center + (radius * UniformRandomVector(r[0], r[1]));
|
---|
| 785 | termination = center;
|
---|
| 786 |
|
---|
| 787 | if (0)
|
---|
| 788 | {
|
---|
| 789 | // add a small offset to provide some more randomness in the sampling
|
---|
| 790 | Vector3 offset(Random(radius * 1e-3f),
|
---|
| 791 | Random(radius * 1e-3f),
|
---|
| 792 | Random(radius * 1e-3f));
|
---|
| 793 | termination += offset;
|
---|
| 794 | }
|
---|
| 795 |
|
---|
| 796 | direction = termination - origin;
|
---|
| 797 |
|
---|
| 798 | // $$ jb the pdf is yet not correct for all sampling methods!
|
---|
| 799 | const float c = Magnitude(direction);
|
---|
| 800 |
|
---|
| 801 | if (c <= Limits::Small)
|
---|
| 802 | return false;
|
---|
| 803 |
|
---|
| 804 | direction *= 1.0f / c;
|
---|
| 805 |
|
---|
| 806 | // check if the ray intersects the view space box
|
---|
| 807 | static Ray ray;
|
---|
| 808 | ray.Init(origin, direction, Ray::LOCAL_RAY);
|
---|
| 809 |
|
---|
| 810 | float tmin, tmax;
|
---|
| 811 | if (mPreprocessor.mViewCellsManager->
|
---|
| 812 | GetViewSpaceBox().ComputeMinMaxT(ray, &tmin, &tmax) && (tmin < tmax))
|
---|
| 813 | break;
|
---|
| 814 | }
|
---|
| 815 |
|
---|
| 816 | if (i != tries)
|
---|
| 817 | {
|
---|
| 818 | // $$ jb the pdf is yet not correct for all sampling methods!
|
---|
| 819 | const float pdf = 1.0f;
|
---|
| 820 |
|
---|
| 821 | ray = SimpleRay(origin, direction, HW_GLOBAL_LINES_DISTRIBUTION, pdf);
|
---|
| 822 | ray.mType = Ray::GLOBAL_RAY;
|
---|
| 823 | return true;
|
---|
| 824 | }
|
---|
| 825 |
|
---|
| 826 | return false;
|
---|
[1952] | 827 | }
|
---|
| 828 |
|
---|
| 829 |
|
---|
[1996] | 830 | bool ViewCellBasedDistribution::GenerateSample(SimpleRay &ray)
|
---|
| 831 | {
|
---|
| 832 | Vector3 origin, direction;
|
---|
| 833 |
|
---|
| 834 | ViewCellContainer &viewCells =
|
---|
| 835 | mPreprocessor.mViewCellsManager->GetViewCells();
|
---|
| 836 |
|
---|
| 837 | Vector3 point;
|
---|
[2003] | 838 | Vector3 normal;
|
---|
| 839 |
|
---|
| 840 | //Vector normalObj;
|
---|
[2000] | 841 | // float r[1];
|
---|
| 842 | // sHalton.GetNext(1, r);
|
---|
| 843 | // const int objIdx = (int)(r[0] * (float)mPreprocessor.mObjects.size() - 1.0f);
|
---|
| 844 | // Intersectable *object = mPreprocessor.mObjects[objIdx];
|
---|
| 845 | // object->GetRandomSurfacePoint(point, normal);
|
---|
| 846 | // cout << "obj: " << objIdx << endl;
|
---|
[1996] | 847 |
|
---|
[2000] | 848 | float r[2];
|
---|
| 849 | sHalton.GetNext(2, r);
|
---|
[1996] | 850 |
|
---|
[2000] | 851 | direction = UniformRandomVector(r[0], r[1]);
|
---|
| 852 | const float c = Magnitude(direction);
|
---|
[1996] | 853 |
|
---|
[2000] | 854 | if (c <= Limits::Small)
|
---|
| 855 | return false;
|
---|
| 856 |
|
---|
| 857 | direction *= 1.0f / c;
|
---|
| 858 |
|
---|
| 859 | // get point on view cell surface
|
---|
[2003] | 860 | mViewCell->GetRandomSurfacePoint(origin, normal);
|
---|
[1996] | 861 |
|
---|
[2000] | 862 | //direction = point - origin;
|
---|
[1996] | 863 |
|
---|
| 864 | // move a little bit back to avoid piercing through walls
|
---|
| 865 | // that bound the view cell
|
---|
[2003] | 866 | origin -= 0.01f * normal;
|
---|
[1996] | 867 |
|
---|
| 868 | // $$ jb the pdf is yet not correct for all sampling methods!
|
---|
| 869 | const float pdf = 1.0f;
|
---|
| 870 |
|
---|
| 871 | ray = SimpleRay(origin, direction, VIEWCELL_BASED_DISTRIBUTION, pdf);
|
---|
| 872 |
|
---|
| 873 | //cout << "ray: " << ray.mOrigin << " " << ray.mDirection << endl;
|
---|
| 874 |
|
---|
| 875 | return true;
|
---|
[1968] | 876 | }
|
---|
| 877 |
|
---|
| 878 |
|
---|
[1996] | 879 | }
|
---|
| 880 |
|
---|
| 881 |
|
---|