1 | #ifndef _SamplingPreprocessor_H__
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2 | #define _SamplingPreprocessor_H__
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3 |
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4 | #include <fstream>
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5 | using namespace std;
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6 |
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7 | #include "Preprocessor.h"
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8 | #include "VssRay.h"
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9 |
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10 | class Exporter;
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11 |
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12 | /** Sampling based visibility preprocessing. The implementation is based on heuristical
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13 | sampling of view space */
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14 | class SamplingPreprocessor : public Preprocessor {
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15 | public:
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16 |
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17 | SamplingPreprocessor();
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18 | ~SamplingPreprocessor();
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19 |
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20 | virtual bool ComputeVisibility();
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21 |
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22 |
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23 | protected:
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24 | /** Sets up ray for sampling.
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25 | */
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26 | void
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27 | SetupRay(Ray &ray,
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28 | const Vector3 &point,
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29 | const Vector3 &direction,
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30 | const int type,
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31 | const Ray::Intersection &source);
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32 |
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33 | /** Refined sampling for finding "holes", i.e., difficult visibility.
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34 | */
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35 | void
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36 | HoleSamplingPass();
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37 |
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38 | /** Casts a bundle of sample rays into the scene.
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39 | @param sampleContributions the number of sample contributions
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40 | @param contributingSamples the number of samples contributing
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41 | */
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42 | void
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43 | CastRays(const RayContainer &rays,
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44 | int &sampleContributions,
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45 | int &contributingSamples);
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46 |
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47 | /** Casts a single ray into the scene.
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48 | @returns sample contributions
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49 | */
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50 | int CastRay(Ray &ray);
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51 |
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52 | /** Verify if the exact visibility for this object was established.
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53 | */
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54 | void
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55 | VerifyVisibility(Intersectable *object);
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56 |
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57 | /** Sample the shiluette of objects in order to find visibility changes
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58 | along the visibility skeleton.
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59 | */
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60 | int
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61 | CastEdgeSamples(
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62 | Intersectable *object,
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63 | const Vector3 &point,
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64 | MeshInstance *mi,
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65 | const int samples
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66 | );
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67 |
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68 | /** Processes the view cells during a pass.
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69 | @param newRays the newly cast rays
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70 | @param sampleContributions returns the accumulated contribution of the samples
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71 | @param contributingSamples returns the samples contributing to pvs
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72 | */
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73 |
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74 | void ProcessViewCells(const RayContainer &newRays,
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75 | const ObjectContainer &objects,
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76 | int &sampleContributions,
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77 | int &contributingSamples);
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78 |
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79 | /** Adds objects samples to kd and bsp view cells.
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80 | */
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81 | int AddObjectSamples(Intersectable *obj, const Ray &ray);
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82 |
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83 | /**
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84 | Returns random node as target for the current sample ray.
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85 | */
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86 | KdNode *GetNodeToSample(Intersectable *object);
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87 |
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88 |
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89 | protected:
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90 |
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91 |
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92 | int mPass;
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93 | int mSamplesPerPass;
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94 | int mTotalSamples;
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95 |
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96 | ofstream mStats;
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97 | ObjectContainer mObjects;
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98 |
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99 | RayContainer mSampleRays;
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100 | VssRayContainer mVssSampleRays;
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101 | };
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102 |
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103 | #endif
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