[176] | 1 | #include "SceneGraph.h" |
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| 2 | #include "KdTree.h" |
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[65] | 3 | #include "SamplingPreprocessor.h" |
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[176] | 4 | #include "X3dExporter.h" |
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[65] | 5 | |
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[176] | 6 | SamplingPreprocessor::SamplingPreprocessor() |
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| 7 | { |
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| 8 | // this should increase coherence of the samples |
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| 9 | mSamplesPerPass = 1; |
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| 10 | mTotalSamples = 1e8; |
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| 11 | mKdPvsDepth = 10; |
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[65] | 12 | |
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[176] | 13 | } |
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| 14 | |
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| 15 | void |
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| 16 | SamplingPreprocessor::SetupRay(Ray &ray, const Vector3 &point, const Vector3 &direction) |
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| 17 | { |
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| 18 | ray.intersections.clear(); |
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| 19 | ray.leaves.clear(); |
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| 20 | ray.meshes.clear(); |
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| 21 | // cout<<point<<" "<<direction<<endl; |
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| 22 | ray.Init(point, direction, Ray::LOCAL_RAY); |
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| 23 | } |
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| 24 | |
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| 25 | KdNode * |
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| 26 | SamplingPreprocessor::GetNodeForPvs(KdLeaf *leaf) |
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| 27 | { |
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| 28 | KdNode *node = leaf; |
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| 29 | while (node->mParent && node->mDepth > mKdPvsDepth) |
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| 30 | node = node->mParent; |
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| 31 | return node; |
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| 32 | } |
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| 33 | |
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| 34 | int |
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| 35 | SamplingPreprocessor::AddNodeSamples(Intersectable *object, const Ray &ray) |
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| 36 | { |
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| 37 | int contributingSamples = 0; |
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| 38 | |
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| 39 | for (int j=0; j < ray.leaves.size(); j++) { |
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| 40 | KdNode *node = GetNodeForPvs( ray.leaves[j] ); |
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| 41 | contributingSamples += object->mKdPvs.AddNodeSample(node); |
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| 42 | } |
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[65] | 43 | |
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[176] | 44 | return contributingSamples; |
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| 45 | } |
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| 46 | |
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[162] | 47 | bool |
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| 48 | SamplingPreprocessor::ComputeVisibility() |
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| 49 | { |
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[176] | 50 | |
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| 51 | // pickup an object |
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| 52 | ObjectContainer objects; |
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| 53 | |
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| 54 | mSceneGraph->CollectObjects(&objects); |
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| 55 | |
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| 56 | Vector3 point, normal, direction; |
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| 57 | Ray ray; |
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| 58 | |
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| 59 | long startTime = GetTime(); |
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| 60 | |
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| 61 | int i; |
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| 62 | int pass = 0; |
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| 63 | int totalSamples = 0; |
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| 64 | |
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| 65 | |
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| 66 | int pvsOut = Min((int)objects.size(), 10); |
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| 67 | |
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| 68 | vector<Ray> rays[10]; |
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| 69 | |
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| 70 | while (totalSamples < mTotalSamples) { |
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| 71 | |
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| 72 | int passContributingSamples = 0; |
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| 73 | int passSampleContributions = 0; |
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| 74 | int passSamples = 0; |
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| 75 | |
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| 76 | for (i =0; i < objects.size(); i++) { |
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| 77 | for (int k=0; k < mSamplesPerPass; k++) { |
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| 78 | Intersectable *object = objects[i]; |
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| 79 | object->GetRandomSurfacePoint(point, normal); |
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| 80 | direction = UniformRandomVector(normal); |
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| 81 | // construct a ray |
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| 82 | SetupRay(ray, point, direction); |
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| 83 | mKdTree->CastRay(ray); |
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| 84 | |
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| 85 | if (i < pvsOut) |
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| 86 | rays[i].push_back(ray); |
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| 87 | |
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| 88 | int sampleContributions = 0; |
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| 89 | |
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| 90 | if (ray.leaves.size()) { |
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| 91 | sampleContributions += AddNodeSamples(object, ray); |
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| 92 | |
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| 93 | if (ray.intersections.size()) { |
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| 94 | sampleContributions += AddNodeSamples(ray.intersections[0].mObject, ray); |
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| 95 | // check whether we can add this to the rays |
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| 96 | for (int j = 0; j < pvsOut; j++) { |
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| 97 | if (objects[j] == ray.intersections[0].mObject) { |
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| 98 | rays[j].push_back(ray); |
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| 99 | } |
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| 100 | } |
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| 101 | } |
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| 102 | passSamples++; |
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| 103 | if (sampleContributions) { |
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| 104 | passContributingSamples++; |
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| 105 | passSampleContributions += sampleContributions; |
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| 106 | } |
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| 107 | } |
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| 108 | } |
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| 109 | } |
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| 110 | totalSamples += passSamples; |
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| 111 | pass++; |
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| 112 | |
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| 113 | int pvsSize = 0; |
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| 114 | for (i=0; i < objects.size(); i++) { |
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| 115 | Intersectable *object = objects[i]; |
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| 116 | pvsSize += object->mKdPvs.mEntries.size(); |
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| 117 | } |
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| 118 | |
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| 119 | cout<<"pass "<<pass<<" : t = "<<TimeDiff(startTime, GetTime())*1e-3<<"s"<<endl; |
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| 120 | cout<<"#totalSamples="<<totalSamples/1000<< |
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| 121 | "k #sampleContributions="<<passSampleContributions<< |
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| 122 | " ("<<100*passContributingSamples/passSamples<<"%)"<< |
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| 123 | " avgPVS="<<pvsSize/(float)objects.size()<<endl; |
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| 124 | } |
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| 125 | bool exportRays = false; |
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| 126 | if (exportRays) { |
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| 127 | Exporter *exporter = NULL; |
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| 128 | exporter = Exporter::GetExporter("sample-rays.x3d"); |
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| 129 | exporter->SetWireframe(); |
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| 130 | exporter->ExportKdTree(*mKdTree); |
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| 131 | for (i=0; i < pvsOut; i++) |
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| 132 | exporter->ExportRays(rays[i], 1000, RgbColor(1, 0, 0)); |
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| 133 | exporter->SetFilled(); |
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| 134 | delete exporter; |
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| 135 | } |
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| 136 | |
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| 137 | if (1) { |
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| 138 | for (int k=0; k < pvsOut; k++) { |
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| 139 | Intersectable *object = objects[k]; |
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| 140 | char s[64]; |
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| 141 | sprintf(s, "sample-pvs%04d.x3d", k); |
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| 142 | Exporter *exporter = Exporter::GetExporter(s); |
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| 143 | exporter->SetWireframe(); |
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| 144 | KdPvsMap::iterator i = object->mKdPvs.mEntries.begin(); |
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| 145 | Intersectable::NewMail(); |
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| 146 | // avoid adding the object to the list |
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| 147 | object->Mail(); |
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| 148 | ObjectContainer visibleObjects; |
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| 149 | for (; i != object->mKdPvs.mEntries.end(); i++) { |
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| 150 | KdNode *node = (*i).first; |
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| 151 | exporter->ExportBox(mKdTree->GetBox(node)); |
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| 152 | mKdTree->CollectObjects(node, visibleObjects); |
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| 153 | } |
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| 154 | |
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| 155 | exporter->ExportRays(rays[k], 1000, RgbColor(0, 1, 0)); |
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| 156 | exporter->SetFilled(); |
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| 157 | |
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| 158 | for (int j = 0; j < visibleObjects.size(); j++) |
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| 159 | exporter->ExportIntersectable(visibleObjects[j]); |
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| 160 | |
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| 161 | Material m; |
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| 162 | m.mDiffuseColor = RgbColor(1, 0, 0); |
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| 163 | exporter->SetForcedMaterial(m); |
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| 164 | exporter->ExportIntersectable(object); |
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| 165 | |
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| 166 | delete exporter; |
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| 167 | } |
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| 168 | |
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| 169 | } |
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| 170 | |
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[162] | 171 | return true; |
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[176] | 172 | } |
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[65] | 173 | |
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[176] | 174 | |
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[65] | 175 | |
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[176] | 176 | |
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