vec_dot()

DOUBLE vec_dot	(	const struct vector	v1,
		const struct vector	v2
	)

Returns the dot product of two vectors as a DOUBLE: .

Parameters

[in]	v1	first vector.
[in]	v2	second vector

Returns

Dot product of two vectors

                                                              {
  return (v1.x*v2.x + v1.y*v2.y + v1.z*v2.z);
}