/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   vec.c                                              :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: gbrochar <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2019/02/06 16:45:13 by gbrochar          #+#    #+#             */
/*   Updated: 2019/02/22 12:48:34 by gbrochar         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "rtv1.h"

t_vec					vec(double x, double y, double z)
{
	t_vec				vec;

	vec.x = x;
	vec.y = y;
	vec.z = z;
	return (vec);
}

t_vec					cross_product(t_vec u, t_vec v)
{
	t_vec				w;

	w.x = u.y * v.z - u.z * v.y;
	w.y = u.z * v.x - u.x * v.z;
	w.z = u.x * v.y - u.y * v.x;
	return (w);
}

double					dot_product(t_vec u, t_vec v)
{
	return (u.x * v.x + u.y * v.y + u.z * v.z);
}

double					vec_length(t_vec vec)
{
	return (sqrt(dot_product(vec, vec)));
}

t_vec					normalize(t_vec *vec)
{
	double				n;

	n = vec_length(*vec);
	vec->x /= n;
	vec->y /= n;
	vec->z /= n;
	return (*vec);
}