From 524db0cf19648e3c7c78d3e73103b7a0bdcd6bfc Mon Sep 17 00:00:00 2001 From: Vito Caputo Date: Wed, 18 Jan 2017 17:14:52 -0800 Subject: *: move source into src/ subdir Restoring some organizational sanity since adopting autotools. --- src/modules/ray/ray_object_sphere.h | 65 +++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 src/modules/ray/ray_object_sphere.h (limited to 'src/modules/ray/ray_object_sphere.h') diff --git a/src/modules/ray/ray_object_sphere.h b/src/modules/ray/ray_object_sphere.h new file mode 100644 index 0000000..85b3d93 --- /dev/null +++ b/src/modules/ray/ray_object_sphere.h @@ -0,0 +1,65 @@ +#ifndef _RAY_OBJECT_SPHERE_H +#define _RAY_OBJECT_SPHERE_H + +#include +#include + +#include "ray_3f.h" +#include "ray_color.h" +#include "ray_object_type.h" +#include "ray_ray.h" +#include "ray_surface.h" + + +typedef struct ray_object_sphere_t { + ray_object_type_t type; + ray_surface_t surface; + ray_3f_t center; + float radius; +} ray_object_sphere_t; + + +static inline int ray_object_sphere_intersects_ray(ray_object_sphere_t *sphere, ray_ray_t *ray, float *res_distance) +{ + ray_3f_t v = ray_3f_sub(&ray->origin, &sphere->center); + float b = ray_3f_dot(&v, &ray->direction); + float disc = (sphere->radius * sphere->radius) - ray_3f_dot(&v, &v) + (b * b); + + if (disc > 0) { + float i1, i2; + + disc = sqrtf(disc); + + i1 = b - disc; + i2 = b + disc; + + if (i2 > 0 && i1 > 0) { + *res_distance = i1; + return 1; + } + } + + return 0; +} + + +/* return the normal of the surface at the specified point */ +static inline ray_3f_t ray_object_sphere_normal(ray_object_sphere_t *sphere, ray_3f_t *point) +{ + ray_3f_t normal; + + normal = ray_3f_sub(point, &sphere->center); + normal = ray_3f_div_scalar(&normal, sphere->radius); /* normalize without the sqrt() */ + + return normal; +} + + +/* return the surface of the sphere @ point */ +static inline ray_surface_t ray_object_sphere_surface(ray_object_sphere_t *sphere, ray_3f_t *point) +{ + /* uniform solids for now... */ + return sphere->surface; +} + +#endif -- cgit v1.2.1