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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