[2546] | 1 | #include "SamplingStrategy.h"
|
---|
| 2 | #include "Intersectable.h"
|
---|
| 3 | #include "DifferenceSampling.h"
|
---|
| 4 | #include "ViewCell.h"
|
---|
[2548] | 5 | #include "ViewCellsManager.h"
|
---|
| 6 | #include "Preprocessor.h"
|
---|
[2546] | 7 |
|
---|
| 8 |
|
---|
| 9 | #ifdef GTP_INTERNAL
|
---|
| 10 | #include "ArchModeler2MLRT.hxx"
|
---|
| 11 | #endif
|
---|
| 12 |
|
---|
| 13 |
|
---|
| 14 | namespace GtpVisibilityPreprocessor {
|
---|
| 15 |
|
---|
| 16 |
|
---|
[2548] | 17 | /** Collects the pvs of the objects which are
|
---|
| 18 | in the first but not in the second pvs.
|
---|
| 19 | */
|
---|
| 20 | static void GetPvsDifference(const ObjectPvs &largerPvs,
|
---|
| 21 | const ObjectPvs &smallerPvs,
|
---|
| 22 | ObjectContainer &pvsDifference)
|
---|
| 23 | {
|
---|
| 24 | Intersectable::NewMail();
|
---|
| 25 | Intersectable *obj;
|
---|
| 26 |
|
---|
| 27 | ObjectPvsIterator bit = smallerPvs.GetIterator();
|
---|
| 28 |
|
---|
| 29 | // mail smaller pvs
|
---|
| 30 | while (bit.HasMoreEntries())
|
---|
| 31 | {
|
---|
| 32 | obj = bit.Next();
|
---|
| 33 | obj->Mail();
|
---|
| 34 | }
|
---|
| 35 |
|
---|
| 36 | ObjectPvsIterator ait = largerPvs.GetIterator();
|
---|
| 37 |
|
---|
| 38 | // write differece pvs
|
---|
| 39 | while (ait.HasMoreEntries())
|
---|
| 40 | {
|
---|
| 41 | obj = ait.Next();
|
---|
| 42 | pvsDifference.push_back(obj);
|
---|
| 43 |
|
---|
| 44 | //if (!obj->Mailed())
|
---|
| 45 | // c.AddSampleDirty(obj, 0);
|
---|
| 46 | }
|
---|
| 47 | }
|
---|
| 48 |
|
---|
| 49 |
|
---|
[2546] | 50 | DifferenceSampling::DifferenceSampling(Preprocessor &preprocessor):
|
---|
[2548] | 51 | SamplingStrategy(preprocessor), mCurrentViewCell(0), mNumSamples(0)
|
---|
[2546] | 52 | {}
|
---|
| 53 |
|
---|
| 54 |
|
---|
[2548] | 55 | void DifferenceSampling::ComputeDifferenceSet(ViewCell *vc,
|
---|
| 56 | ObjectContainer &differenceSet)
|
---|
[2546] | 57 | {
|
---|
[2548] | 58 | const ObjectPvs &pvs = vc->GetPvs();
|
---|
| 59 | const float filterSize = 100;
|
---|
| 60 | ObjectPvs filteredPvs;
|
---|
| 61 |
|
---|
| 62 | PvsFilterStatistics pvsStats = mPreprocessor.
|
---|
| 63 | mViewCellsManager->ApplyFilter2(vc,
|
---|
| 64 | false,
|
---|
| 65 | filterSize,
|
---|
| 66 | filteredPvs);
|
---|
| 67 |
|
---|
| 68 | //mDifferencePvs.Clear(false);
|
---|
| 69 | //mDifferencePvs.Reserve(filteredPvs.GetSize());
|
---|
| 70 | mPvsDifference.clear();
|
---|
| 71 | mPvsDifference.reserve(filteredPvs.GetSize());
|
---|
| 72 |
|
---|
| 73 | GetPvsDifference(filteredPvs, pvs, mPvsDifference);
|
---|
[2546] | 74 | }
|
---|
| 75 |
|
---|
[2548] | 76 |
|
---|
| 77 | bool DifferenceSampling::GenerateSample(SimpleRay &ray)
|
---|
| 78 | {
|
---|
| 79 | if (mNumSamples -- <= 0)
|
---|
| 80 | {
|
---|
| 81 | ViewCellContainer &viewCells = mPreprocessor.mViewCellsManager->GetViewCells();
|
---|
| 82 | const int vcIdx = (int)RandomValue(0, (float)viewCells.size() - 0.5f);
|
---|
| 83 |
|
---|
| 84 | mCurrentViewCell = viewCells[vcIdx];
|
---|
| 85 |
|
---|
| 86 | ComputeDifferenceSet(mCurrentViewCell, mPvsDifference);
|
---|
| 87 |
|
---|
| 88 | // n samples per object
|
---|
| 89 | const int n = 50;
|
---|
| 90 | mNumSamples = mPvsDifference.size() * n;
|
---|
| 91 | }
|
---|
| 92 |
|
---|
| 93 | Vector3 origin, direction;
|
---|
| 94 | Vector3 point;
|
---|
| 95 | Vector3 normal, vcnormal;
|
---|
| 96 |
|
---|
| 97 | // get a new object from the difference set
|
---|
| 98 | const int objIdx = (int)RandomValue(0, (float)mPvsDifference.size() - 0.5f);
|
---|
| 99 | Intersectable *object = mPvsDifference[objIdx];
|
---|
| 100 |
|
---|
| 101 | // cast a ray from the view cells border towards the object
|
---|
| 102 | object->GetRandomSurfacePoint(point, normal);
|
---|
| 103 | mCurrentViewCell->GetRandomEdgePoint(origin, vcnormal);
|
---|
| 104 |
|
---|
| 105 | direction = point - origin;
|
---|
| 106 |
|
---|
| 107 | // $$ jb the pdf is yet not correct for all sampling methods!
|
---|
| 108 | const float c = Magnitude(direction);
|
---|
| 109 |
|
---|
| 110 | if ((c <= Limits::Small) /*|| (DotProd(direction, normal) < 0)*/)
|
---|
| 111 | {
|
---|
| 112 | return false;
|
---|
| 113 | }
|
---|
| 114 |
|
---|
| 115 | // $$ jb the pdf is yet not correct for all sampling methods!
|
---|
| 116 | const float pdf = 1.0f;
|
---|
| 117 | //cout << "p: " << point << " ";
|
---|
| 118 | direction *= 1.0f / c;
|
---|
| 119 | ray = SimpleRay(origin, direction, DIFFERENCE_SAMPLING_BASED_DISTRIBUTION, pdf);
|
---|
| 120 |
|
---|
| 121 | //cout << "ray: " << ray.mOrigin << " " << ray.mDirection << endl;
|
---|
| 122 |
|
---|
| 123 | return true;
|
---|
| 124 | }
|
---|
| 125 |
|
---|
| 126 |
|
---|
[2546] | 127 | } |
---|