OEGeom3DAngle

template<class T>
double OEGeom3DAngle(const T *p, const T *q)
template<class T, class U, class V>
double OEGeom3DAngle(const T *p, const U *q, const V *r)

Determines the angle in three dimensions. The first form is between two vectors p and q, and the second form is between three cartesian coordinate points p, q and r with q being the vertex. The result is in radians.