Limit CameraPick to the CameraRange ??

I´d have to do a lot of transformation with linepick :o). Right now I solved it this way; a big helper quad is aligned to the triangle I want to pick, then moved slightly towards the camera. Pickmode for the main mesh is deactivated, for the quad activated, then I camerapick the quad, position the camera at pickedxyz, swap the pickmodes of quad and mesh and do a further camerapick. Probably this is even faster since most of the picking range is done with only one pickable quad in the scene.

And yes, I need this to scan the triangles of a mesh in order to lightmap it.