diff options
Diffstat (limited to 'vendor/libftm/src/vec3/ftm_vec3cross.c')
| -rw-r--r-- | vendor/libftm/src/vec3/ftm_vec3cross.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/vendor/libftm/src/vec3/ftm_vec3cross.c b/vendor/libftm/src/vec3/ftm_vec3cross.c new file mode 100644 index 0000000..c27534e --- /dev/null +++ b/vendor/libftm/src/vec3/ftm_vec3cross.c @@ -0,0 +1,26 @@ +/* ************************************************************************** */ +/* */ +/* ::: :::::::: */ +/* ftm_vec3cross.c :+: :+: :+: */ +/* +:+ +:+ +:+ */ +/* By: charles <charles.cabergs@gmail.com> +#+ +:+ +#+ */ +/* +#+#+#+#+#+ +#+ */ +/* Created: 2020/05/09 21:20:41 by charles #+# #+# */ +/* Updated: 2020/05/09 21:25:44 by charles ### ########.fr */ +/* */ +/* ************************************************************************** */ + +#include "libftm_vec3.h" + +/* +** s1 = a2 * b3 - a3 * b2 +** s2 = a3 * b1 - a1 * b3 +** s3 = a1 * b2 - a2 * b1 +*/ + +void ftm_vec3cross(t_ftmvec3 *dst, t_ftmvec3 *a, t_ftmvec3 *b) +{ + 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]; +} |