void _CrossProduct (vec3_t v1, vec3_t v2, vec3_t cross);
vec_t VectorNormalize (const vec3_t in, vec3_t out);
+vec_t VectorSetLength (const vec3_t in, vec_t length, vec3_t out);
vec_t ColorNormalize( const vec3_t in, vec3_t out );
void VectorInverse (vec3_t v);
void VectorPolar(vec3_t v, float radius, float theta, float phi);