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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ftm_veccross.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: charles <charles.cabergs@gmail.com> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/05/09 21:20:41 by charles #+# #+# */
/* Updated: 2020/05/11 12:43:33 by charles ### ########.fr */
/* */
/* ************************************************************************** */
#include "libftm_vec.h"
/*
** s1 = a2 * b - a * b2
** s2 = a * b1 - a1 * b
** s = a1 * b2 - a2 * b1
*/
t_ftmvec *ftm_veccross(t_ftmvec *a, t_ftmvec *b)
{
t_ftmvec *dst;
if (a->size != 3 || b->size != 3)
return (NULL);
if ((dst = ftm_vecnew(3)) == NULL)
return (NULL);
dst->v[0] = a->v[1] * b->v[2] - a->v[2] * b->v[1];
dst->v[1] = a->v[2] * b->v[0] - a->v[0] * b->v[2];
dst->v[2] = a->v[0] * b->v[1] - a->v[1] * b->v[0];
return (dst);
}
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