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1 #ifndef GEOM_H_
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2 #define GEOM_H_
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3
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4 #include <vmath/vmath.h>
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5
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6 class GeomShape;
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7
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8 struct HitPoint {
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9 float dist;
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10 Vector3 pos;
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11 Vector3 normal;
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12 const GeomShape *shape;
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13 void *data;
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14 };
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15
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16 class GeomShape {
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17 public:
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18 enum Type { GEOM_UNKNOWN, GEOM_SPHERE, GEOM_PLANE, GEOM_AABOX };
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19
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20 protected:
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21 Matrix4x4 xform, inv_xform;
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22 Type type;
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23
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24 public:
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25 GeomShape();
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26 virtual ~GeomShape();
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27
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28 virtual Type get_type() const;
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29
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30 // apply an arbitrary transformation before testing intersections and collisions
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31 virtual void set_transform(const Matrix4x4 &m);
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32 virtual const Matrix4x4 &get_transform() const;
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33 virtual const Matrix4x4 &get_inv_transform() const;
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34
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35 virtual bool contains(const Vector3 &pt) const = 0;
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36 virtual bool intersect(const Ray &ray, HitPoint *hit = 0) const = 0;
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37 virtual bool collide(const GeomShape *geom, HitPoint *hit = 0) const = 0;
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38
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39 virtual float distance(const Vector3 &pt) const = 0;
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40 virtual float distance_sq(const Vector3 &pt) const = 0;
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41
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42 // visualize the shape
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43 virtual void draw() const = 0;
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44 };
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45
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46 class Sphere : public GeomShape {
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47 public:
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48 Vector3 center;
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49 float radius;
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50
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51 Sphere();
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52 Sphere(const Vector3 &c, float rad);
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53
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54 bool contains(const Vector3 &pt) const;
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55 bool intersect(const Ray &ray, HitPoint *hit = 0) const;
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56 bool collide(const GeomShape *geom, HitPoint *hit = 0) const;
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57
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58 float distance(const Vector3 &pt) const;
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59 float distance_sq(const Vector3 &pt) const;
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60
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61 void draw() const;
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62 };
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63
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64 class Plane : public GeomShape {
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65 public:
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66 Vector3 normal;
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67 float dist;
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68
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69 Plane();
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70 Plane(const Vector3 &n, float d);
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71 Plane(float a, float b, float c, float d);
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72 Plane(const Vector3 &pos, const Vector3 &norm);
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73 Plane(const Vector3 &p1, const Vector3 &p2, const Vector3 &p3);
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74
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75 bool contains(const Vector3 &pt) const;
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76 bool intersect(const Ray &ray, HitPoint *hit = 0) const;
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77 bool collide(const GeomShape *geom, HitPoint *hit = 0) const;
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78
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79 float distance(const Vector3 &pt) const;
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80 float distance_sq(const Vector3 &pt) const;
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81
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82 void draw() const;
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83 };
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84
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85 class AABox : public GeomShape {
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86 public:
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87 Vector3 min, max;
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88
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89 AABox();
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90 AABox(const Vector3 &min, const Vector3 &max);
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91
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92 void set_union(const GeomShape *obj1, const GeomShape *obj2);
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93 void set_intersection(const GeomShape *obj1, const GeomShape *obj2);
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94
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95 bool contains(const Vector3 &pt) const;
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96 bool intersect(const Ray &ray, HitPoint *hit = 0) const;
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97 bool collide(const GeomShape *geom, HitPoint *hit = 0) const;
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98
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99 float distance(const Vector3 &pt) const;
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100 float distance_sq(const Vector3 &pt) const;
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101
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102 void draw() const;
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103 };
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104
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105 #endif // GEOM_H_
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