Yannis Antoine
97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* shadows.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: yantoine <yantoine@student.42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2025/02/17 18:58:42 by yantoine #+# #+# */
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/* Updated: 2025/03/05 14:26:08 by yantoine ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "miniRT.h"
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// Vérifie les intersections avec les sphères
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static bool check_shadow_sphere(const t_ray shadow_ray, float max_t,
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t_scene scene)
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{
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const float epsilon = 0.001f;
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int i;
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t_vec3 dummy;
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float t;
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i = 0;
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while (i < scene.num_spheres)
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{
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t = intersect_sphere(shadow_ray, scene.spheres[i], &dummy);
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if (t > epsilon && t < max_t)
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return (true);
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i++;
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}
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return (false);
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}
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// Vérifie les intersections avec les plans
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static bool check_shadow_plane(const t_ray shadow_ray, float max_t,
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t_scene scene)
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{
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const float epsilon = 0.001f;
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int i;
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t_vec3 dummy;
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float t;
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i = 0;
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while (i < scene.num_planes)
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{
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t = intersect_plane(shadow_ray, scene.planes[i], &dummy);
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if (t > epsilon && t < max_t)
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return (true);
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i++;
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}
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return (false);
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}
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// Vérifie les intersections avec les cylindres
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static bool check_shadow_cylinder(const t_ray shadow_ray, float max_t,
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t_scene scene)
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{
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const float epsilon = 0.001f;
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int i;
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t_vec3 dummy;
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float t;
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i = 0;
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while (i < scene.num_cylinders)
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{
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t = intersect_cylinder(shadow_ray, scene.cylinders[i], &dummy);
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if (t > epsilon && t < max_t)
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return (true);
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i++;
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}
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return (false);
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}
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// Fonction principale qui détermine si le point est dans l'ombre
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bool is_in_shadow(t_vec3 hitPoint, t_vec3 lightPos, t_scene scene)
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{
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const float epsilon = 0.001f;
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t_vec3 to_light;
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float max_t;
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t_vec3 l;
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t_ray shadow_ray;
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to_light = vec3_sub(lightPos, hitPoint);
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max_t = vec3_length(to_light);
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l = vec3_normalize(to_light);
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shadow_ray.origin = vec3_add(hitPoint, vec3_scale(l, epsilon));
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shadow_ray.dir = l;
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if (check_shadow_sphere(shadow_ray, max_t, scene))
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return (true);
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if (check_shadow_plane(shadow_ray, max_t, scene))
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return (true);
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if (check_shadow_cylinder(shadow_ray, max_t, scene))
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return (true);
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return (false);
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}
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