get_shadow_ray.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   get_shadow_ray.c                                   :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: shongou <shongou@student.42tokyo.jp>       +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/01/04 23:33:43 by shongou           #+#    #+#             */
/*   Updated: 2023/01/04 23:33:45 by shongou          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "minirt.h"

t_nearest	get_shadow_ray(t_config config, t_nearest nearest, t_vec light_dir)
{
	t_nearest	i_point_near;
	double		distance;
	t_ray		shadow_ray;

	distance = norm(sub(config.light.vec, nearest.i_point.pos)) - (1.0 / 512);
	shadow_ray.start = add(nearest.i_point.pos, mul(1.0 / 512, light_dir));
	shadow_ray.direction = light_dir;
	i_point_near = get_nearest(config, shadow_ray, distance, 1);
	return (i_point_near);
}