H3XploR
89 lines
2.7 KiB
C
89 lines
2.7 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* trace.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 19:07:07 by yantoine #+# #+# */
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/* Updated: 2025/02/19 16:59:53 by yantoine ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "miniRT.h"
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static t_vec3 clamp_color(t_vec3 color)
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{
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if (color.x > 1.0f)
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color.x = 1.0f;
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if (color.y > 1.0f)
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color.y = 1.0f;
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if (color.z > 1.0f)
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color.z = 1.0f;
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return (color);
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}
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static t_vec3 calc_light_contribution(t_hit_info hit, t_light light,
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t_camera camera, t_scene scene)
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{
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t_vec3 l;
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float diff;
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t_vec3 view_dir;
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t_vec3 half_dir;
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float spec;
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l = vec3_normalize(vec3_sub(light.pos, hit.point));
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if (is_in_shadow(hit.point, light.pos, scene))
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return ((t_vec3){0, 0, 0});
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diff = fmaxf(0.0f, vec3_dot(hit.normal, l));
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view_dir = vec3_normalize(vec3_sub(camera.cam_pos, hit.point));
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half_dir = vec3_normalize(vec3_add(l, view_dir));
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spec = powf(fmaxf(0.0f, vec3_dot(hit.normal, half_dir)), 32.0f);
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return (vec3_add(vec3_scale(vec3_mul(hit.color, \
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light.color), diff * light.brightness), \
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vec3_scale((t_vec3){1, 1, 1}, \
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spec * light.brightness)));
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}
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t_vec3 calc_lighting(t_vec3 hit_point, t_vec3 hit_normal, t_vec3 obj_color,
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t_scene scene)
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{
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t_vec3 color;
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t_hit_info hit;
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int i;
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color = vec3_scale(obj_color, scene.ambient.ratio);
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hit.point = hit_point;
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hit.normal = hit_normal;
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hit.color = obj_color;
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i = 0;
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while (i < scene.num_lights)
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{
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color = vec3_add(color, calc_light_contribution(hit, scene.lights[i],
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scene.camera, scene));
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i++;
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}
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return (clamp_color(color));
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}
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// Fonction principale de lancer de rayon (trace)
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t_vec3 trace(t_ray ray, t_scene scene)
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{
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float t_min;
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t_vec3 hit_normal;
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t_vec3 obj_color;
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t_vec3 hit_point;
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t_min = 1e9;
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hit_normal = (t_vec3){0, 0, 0};
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obj_color = (t_vec3){0, 0, 0};
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scene.ray = ray;
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if (intersect_objects(&t_min, &hit_normal, &obj_color, scene))
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{
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hit_point = vec3_add(scene.ray.origin, vec3_scale(scene.ray.dir,
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t_min));
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return (calc_lighting(hit_point, hit_normal, obj_color, scene));
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}
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return ((t_vec3){0, 0, 0});
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}
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