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multiply vec3 with affine transform rotation (mat4)

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this is may useful for rotate a vec3 with affine transform
This commit is contained in:
Recep Aslantas
2017-01-26 12:25:14 +03:00
parent 2dce066f51
commit 026750cae5
1 changed files with 17 additions and 0 deletions
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17
include/cglm-mat.h
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@@ -246,6 +246,23 @@ glm_mat4_mulv(mat4 m, vec4 v, vec4 dest) {
#endif
}
/*!
* @brief multiply vector with mat4's mat3 part(rotation)
*
* @param[in] m mat4(affine transform)
* @param[in] v vec3
* @param[out] dest vec3
*/
CGLM_INLINE
void
glm_mat4_mulv3(mat4 m, vec3 v, vec3 dest) {
vec3 res;
res[0] = m[0][0] * v[0] + m[1][0] * v[1] + m[2][0] * v[2];
res[1] = m[0][1] * v[0] + m[1][1] * v[1] + m[2][1] * v[2];
res[2] = m[0][2] * v[0] + m[1][2] * v[1] + m[2][2] * v[2];
glm_vec_dup(res, dest);
}
/*!
* @brief transpose mat4 and store in dest
*