H3XploR
77 lines
3.0 KiB
C
77 lines
3.0 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 16:37:40 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, t_camera camera, t_scene scene)
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{
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t_vec3 l = vec3_normalize(vec3_sub(light.pos, hit.point)); // Variable 1
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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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float diff = fmaxf(0.0f, vec3_dot(hit.normal, l)); // Variable 2
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t_vec3 view_dir = vec3_normalize(vec3_sub(camera.camPos, hit.point)); // Variable 3
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t_vec3 half_dir = vec3_normalize(vec3_add(l, view_dir)); // Variable 4
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float spec = powf(fmaxf(0.0f, vec3_dot(hit.normal, half_dir)), 32.0f); // Variable 5
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return vec3_add(
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vec3_scale(vec3_mul(hit.color, light.color), diff * light.brightness),
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vec3_scale((t_vec3){1, 1, 1}, 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, t_scene scene)
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{
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t_vec3 color = vec3_scale(obj_color, scene.ambient.ratio); // Variable 1
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t_hit_info hit; // Variable 2
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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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int i = 0; // Variable 3
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while (i < scene.numLights)
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{
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color = vec3_add(color,
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calc_light_contribution(hit, scene.lights[i], 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, \
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vec3_scale(scene.ray.dir, 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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