I have various planes defined in the context of and referencing various plane definition points in complex sldprt models. I need to create a 3d sketch line normal to the selected plane which starts as a pierce point on the plane and terminates on the global origin. Given that, I then need to measure that distance and angular offsets from the standard default planes. Does anyone know how to construct and constrain a 3d line that will give me this type result. Effectively this is a polar vector based at the origin and terminating as a normal to the selected plane.