Vector3Barycenter method
Compute barycenter coordinates (u, v, w) for point p with respect to triangle (a, b, c)
NOTE: Assumes P is on the plane of the triangle
Implementation
Vector3C Vector3Barycenter(Vector3C p, Vector3C a, Vector3C b, Vector3C c)
=> _Vector3Barycenter(p, a, b, c);