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vec: fix rotating vector with affine transform

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* first normalize rotation vectors because we only want to rotate here
not scaling
This commit is contained in:
Recep Aslantas
2017-02-01 00:11:13 +03:00
parent d3a9d1bb7a
commit 124a9587c5
1 changed files with 10 additions and 4 deletions
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14
include/cglm-vec.h
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@@ -465,10 +465,16 @@ glm_vec_rotate(vec3 v, float angle, vec3 axis) {
CGLM_INLINE
void
glm_vec_rotate_m4(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];
vec3 res, x, y, z;
glm_vec_normalize_to(m[0], x);
glm_vec_normalize_to(m[1], y);
glm_vec_normalize_to(m[2], z);
res[0] = x[0] * v[0] + y[0] * v[1] + z[0] * v[2];
res[1] = x[1] * v[0] + y[1] * v[1] + z[1] * v[2];
res[2] = x[2] * v[0] + y[2] * v[1] + z[2] * v[2];
glm_vec_dup(res, dest);
}