H3XploR
53 lines
2.1 KiB
C
53 lines
2.1 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* parsing_sphere.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: yantoine <yantoine@student.42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2025/02/15 19:46:16 by yantoine #+# #+# */
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/* Updated: 2025/02/19 16:59:34 by yantoine ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "miniRT.h"
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t_scene parsing_sphere(t_scene scene)
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{
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char **tokens;
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tokens = get_tokens_secure(scene, scene.num_spheres, MAX_SPHERES, 4);
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scene.token_if_exit = tokens;
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scene.spheres[scene.num_spheres].center = parse_vector(tokens[1], scene);
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scene.spheres[scene.num_spheres].radius = ft_atof(tokens[2]) / 2.0f;
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scene.spheres[scene.num_spheres].color = parse_color(tokens[3], scene);
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ft_free_array(tokens);
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scene.num_spheres++;
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return (scene);
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}
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float intersect_sphere(t_ray ray, t_sphere s, t_vec3 *hitNormal)
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{
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t_calc calc;
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calc.oc = vec3_sub(ray.origin, s.center);
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calc.a = vec3_dot(ray.dir, ray.dir);
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calc.b = 2.0f * vec3_dot(calc.oc, ray.dir);
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calc.c = vec3_dot(calc.oc, calc.oc) - s.radius * s.radius;
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calc.disc = calc.b * calc.b - 4 * calc.a * calc.c;
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if (calc.disc < 0)
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return (-1);
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calc.sqrt_disc = sqrtf(calc.disc);
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calc.t0 = (-calc.b - calc.sqrt_disc) / (2 * calc.a);
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calc.t1 = (-calc.b + calc.sqrt_disc) / (2 * calc.a);
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if (calc.t0 > 1e-3f)
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calc.t = calc.t0;
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else
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calc.t = calc.t1;
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if (calc.t < 1e-3f)
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return (-1);
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calc.hit_point = vec3_add(ray.origin, vec3_scale(ray.dir, calc.t));
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*hitNormal = vec3_normalize(vec3_sub(calc.hit_point, s.center));
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return (calc.t);
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}
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