Offsets (translate) a geometry by a fixed distance without changing its shape, size or orientation.
Parameter 1 - the geometry to be offset.
Parameter 2 - the distance to move the geometry in the x direction.
Parameter 3 - the distance to move the geometry in the y direction.
Parameter 4 (Optional) - distance to move the geometry in the z direction.
Returns: the resulting translated geometry. If parameter 1 is a 2D geometry and parameter 4 is supplied, the result will be a 3D geometry. If parameter 1 is null, the result will be null.
If parameter 1 is not a geometry, an exception will be thrown.