diff options
Diffstat (limited to 'vendor/libftm/src/vec/ftm_veccross.c')
| -rw-r--r-- | vendor/libftm/src/vec/ftm_veccross.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/vendor/libftm/src/vec/ftm_veccross.c b/vendor/libftm/src/vec/ftm_veccross.c new file mode 100644 index 0000000..48dda5f --- /dev/null +++ b/vendor/libftm/src/vec/ftm_veccross.c @@ -0,0 +1,33 @@ +/* ************************************************************************** */ +/* */ +/* ::: :::::::: */ +/* 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); +} |