1 | #include "IntersectableWrapper.h"
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2 | #include "Mesh.h"
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3 | #include "Triangle3.h"
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4 |
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5 |
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6 | namespace GtpVisibilityPreprocessor {
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7 |
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8 |
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9 | AxisAlignedBox3 TriangleIntersectable::GetBox() const
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10 | {
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11 | return mItem.GetBoundingBox();
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12 | }
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13 |
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14 |
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15 | int TriangleIntersectable::CastRay(Ray &ray)
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16 | {
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17 | float nearestT = MAX_FLOAT;
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18 | float t;
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19 | Vector3 nearestNormal;
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20 |
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21 | if (ray.GetType() == Ray::LOCAL_RAY && !ray.intersections.empty())
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22 | nearestT = ray.intersections[0].mT;
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23 |
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24 | const int hitCode = mItem.CastRay(ray, t, nearestT, nearestNormal);
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25 |
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26 | nearestT = t;
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27 |
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28 | if ((hitCode == Ray::INTERSECTION) && (ray.GetType() == Ray::LOCAL_RAY))
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29 | {
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30 | if (!ray.intersections.empty())
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31 | {
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32 | ray.intersections[0] = Ray::Intersection(nearestT, nearestNormal, this, 0);
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33 | }
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34 | else
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35 | {
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36 | ray.intersections.push_back(Ray::Intersection(nearestT, nearestNormal, this, 0));
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37 | }
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38 |
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39 | return 1;
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40 | }
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41 |
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42 | return 0;
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43 | }
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44 |
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45 |
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46 | int TriangleIntersectable::NumberOfFaces() const
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47 | {
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48 | return 1;
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49 | }
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50 |
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51 |
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52 | Vector3 TriangleIntersectable::GetNormal(const int idx) const
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53 | {
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54 | return mItem.GetNormal();
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55 | }
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56 |
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57 | int
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58 | TriangleIntersectable::GetRandomSurfacePoint(Vector3 &point, Vector3 &normal)
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59 | {
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60 | // random barycentric coordinates
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61 | float a = RandomValue(0,1);
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62 | float b = RandomValue(0,1);
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63 | float c = RandomValue(0,1);
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64 |
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65 | const float sum = a + b + c;
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66 |
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67 | // scale so we get vaccumated value of 1
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68 | if (sum)
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69 | {
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70 | a /= sum;
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71 | b /= sum;
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72 | c /= sum;
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73 | }
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74 |
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75 | //cout << "a: " << a << " b: " << b << " c: " << c << " sum: " << sum << endl;
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76 | point = mItem.mVertices[0] * a + mItem.mVertices[1] * b + mItem.mVertices[2] * c;
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77 | normal = mItem.GetNormal();
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78 |
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79 | return 0;
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80 | }
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81 |
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82 |
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83 | int TriangleIntersectable::GetRandomVisibleSurfacePoint(Vector3 &point,
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84 | Vector3 &normal,
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85 | const Vector3 &viewpoint,
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86 | const int maxTries)
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87 | {
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88 | return GetRandomSurfacePoint(point, normal);
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89 | }
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90 |
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91 | } |
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