H3XploR
51 lines
2.0 KiB
C
51 lines
2.0 KiB
C
/* ************************************************************************** */
|
|
/* */
|
|
/* ::: :::::::: */
|
|
/* parsing_sphere.c :+: :+: :+: */
|
|
/* +:+ +:+ +:+ */
|
|
/* By: yantoine <yantoine@student.42.fr> +#+ +:+ +#+ */
|
|
/* +#+#+#+#+#+ +#+ */
|
|
/* Created: 2025/02/15 19:46:16 by yantoine #+# #+# */
|
|
/* Updated: 2025/02/17 21:31:36 by yantoine ### ########.fr */
|
|
/* */
|
|
/* ************************************************************************** */
|
|
|
|
#include "miniRT.h"
|
|
|
|
t_scene parsing_sphere(t_scene scene)
|
|
{
|
|
char **tokens;
|
|
|
|
tokens = get_tokens_secure(scene, scene.numSpheres, MAX_SPHERES, 4);
|
|
scene.token_if_exit = tokens;
|
|
scene.spheres[scene.numSpheres].center = parse_vector(tokens[1], scene);
|
|
scene.spheres[scene.numSpheres].radius = ft_atof(tokens[2]) / 2.0f;
|
|
scene.spheres[scene.numSpheres].color = parse_color(tokens[3], scene);
|
|
ft_free_array(tokens);
|
|
scene.numSpheres++;
|
|
return (scene);
|
|
}
|
|
|
|
float intersectSphere(t_ray ray, t_sphere s, t_vec3 *hitNormal)
|
|
{
|
|
t_calc calc;
|
|
|
|
calc.oc = vec3_sub(ray.origin, s.center);
|
|
calc.a = vec3_dot(ray.dir, ray.dir);
|
|
calc.b = 2.0f * vec3_dot(calc.oc, ray.dir);
|
|
calc.c = vec3_dot(calc.oc, calc.oc) - s.radius * s.radius;
|
|
calc.disc = calc.b * calc.b - 4 * calc.a * calc.c;
|
|
if (calc.disc < 0)
|
|
return (-1);
|
|
calc.sqrtDisc = sqrtf(calc.disc);
|
|
calc.t0 = (-calc.b - calc.sqrtDisc) / (2 * calc.a);
|
|
calc.t1 = (-calc.b + calc.sqrtDisc) / (2 * calc.a);
|
|
calc.t = (calc.t0 > 1e-3f) ? calc.t0 : calc.t1;
|
|
if (calc.t < 1e-3f)
|
|
return (-1);
|
|
calc.hitPoint = vec3_add(ray.origin, vec3_scale(ray.dir, calc.t));
|
|
*hitNormal = vec3_normalize(vec3_sub(calc.hitPoint, s.center));
|
|
return (calc.t);
|
|
}
|
|
|