1  /* ************************************************************************** */
 2  /*                                                                            */
 3  /*                                                        :::      ::::::::   */
 4  /*   ray.c                                              :+:      :+:    :+:   */
 5  /*                                                    +:+ +:+         +:+     */
 6  /*   By: salee2 <salee2@student.42seoul.kr>         +#+  +:+       +#+        */
 7  /*                                                +#+#+#+#+#+   +#+           */
 8  /*   Created: 2023/05/24 20:22:46 by salee2            #+#    #+#             */
 9  /*   Updated: 2023/05/24 20:22:49 by salee2           ###   ########.fr       */
10  /*                                                                            */
11  /* ************************************************************************** */
12  
13  #include "include/minirt.h"
14  
15  t_ray ray_(t_point3 origin, t_vec3 dir)
16  {
17  	t_ray this;
18  
19  	this.origin = origin;
20  	this.dir = norm(dir);
21  	return (this);
22  }
23  
24  t_vec3	ray_at(double t, t_ray *ray)
25  {
26  	t_vec3 this;
27  
28  	this = add(ray->origin, scl_mul(t, ray->dir));
29  	return (this);
30  }
31  
32  t_ray primary_ray(t_camera *cam, t_vec2 xy)
33  {
34  	t_ray			this;
35  	const t_vec3	ai = scl_mul(xy.x, cam->ai);
36  	const t_vec3	bj = scl_mul(xy.y, cam->bj);
37  
38  	this.origin = cam->origin;
39  	this.dir = norm(sub(add(add(cam->lower_left_corner, ai), bj), cam->origin));
40  	return (this);
41  }
42  
43  int	ray_color(t_scene *scene)
44  {
45  	double		t;
46  	t_color3	color;
47  
48  	scene->hit = hit_(INFINITY);
49  	if (hit_objects(scene->objects, &scene->ray, &scene->hit))
50  		color = phong_lighting(scene);
51  	else
52  	{
53  		t = 0.5 * (scene->ray.dir.bj + 1.0);
54  		color = add(scl_mul(1.0 - t, color3_(1.0, 1.0, 1.0)), scl_mul(t, color3_(0.5, 0.7, 1.0)));
55  	}
56  	return (create_trgb(color));
57  }
58