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improve getting angle between two vector

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This commit is contained in:
Recep Aslantas
2017-01-24 16:39:57 +03:00
parent 9ac590bc12
commit 13a47ca598
1 changed files with 5 additions and 1 deletions
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6
include/cglm-vec.h
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@@ -372,7 +372,11 @@ glm_vec4_normalize_to(vec4 vec, vec4 dest) {
CGLM_INLINE
float
glm_vec_angle(vec3 v1, vec3 v2) {
return acosf(glm_vec_dot(v1, v2) / glm_vec_norm(v1) * glm_vec_norm(v2));
float norm;
/* maybe compiler generate approximation instruction (rcp) */
norm = 1.0f / (glm_vec_norm(v1) * glm_vec_norm(v2));
return acosf(glm_vec_dot(v1, v2) * norm);
}
CGLM_INLINE