55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* vec.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: gbrochar <marvin@42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2019/02/06 16:45:13 by gbrochar #+# #+# */
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/* Updated: 2019/02/22 12:48:34 by gbrochar ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "rtv1.h"
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t_vec vec(double x, double y, double z)
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{
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t_vec vec;
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vec.x = x;
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vec.y = y;
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vec.z = z;
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return (vec);
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}
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t_vec cross_product(t_vec u, t_vec v)
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{
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t_vec w;
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w.x = u.y * v.z - u.z * v.y;
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w.y = u.z * v.x - u.x * v.z;
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w.z = u.x * v.y - u.y * v.x;
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return (w);
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}
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double dot_product(t_vec u, t_vec v)
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{
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return (u.x * v.x + u.y * v.y + u.z * v.z);
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}
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double vec_length(t_vec vec)
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{
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return (sqrt(dot_product(vec, vec)));
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}
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t_vec normalize(t_vec *vec)
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{
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double n;
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n = vec_length(*vec);
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vec->x /= n;
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vec->y /= n;
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vec->z /= n;
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return (*vec);
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}
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