1 #ifndef VMATH_RAY_H_

2 #define VMATH_RAY_H_

3

4 #include "matrix.h"

5 #include "vector.h"

6

7 typedef struct {

8 vec3_t origin, dir;

9 } ray_t;

10

11 #ifdef __cplusplus

12 extern "C" {

13 #endif /* __cplusplus */

14

15 static inline ray_t ray_cons(vec3_t origin, vec3_t dir);

16 ray_t ray_transform(ray_t r, mat4_t m);

17

18 #ifdef __cplusplus

19 } /* __cplusplus */

20

21 #include <stack>

22

23 class Ray {

24 private:

25 std::stack<scalar_t> ior_stack;

26

27 public:

28 /* enviornmental index of refraction, normally 1.0 */

29 static scalar_t env_ior;

30

31 Vector3 origin, dir;

32 scalar_t energy;

33 int iter;

34 scalar_t ior;

35 long time;

36

37 Ray();

38 Ray(const Vector3 &origin, const Vector3 &dir);

39

40 void transform(const Matrix4x4 &xform);

41 Ray transformed(const Matrix4x4 &xform) const;

42

43 void enter(scalar_t new_ior);

44 void leave();

45

46 scalar_t calc_ior(bool entering, scalar_t mat_ior = 1.0) const;

47 };

48

49 inline Ray reflect_ray(const Ray &inray, const Vector3 &norm);

50 inline Ray refract_ray(const Ray &inray, const Vector3 &norm, scalar_t ior, bool entering, scalar_t ray_mag = -1.0);

51 #endif /* __cplusplus */

52

53 #include "ray.inl"

54

55 #endif /* VMATH_RAY_H_ */