Anyone tried this modeler yet? http://k3d.sourceforge.net Looks like it is under heavy development, with python scripting engine and what looks like a decent plug-in architecture. Found while searching for some precedent of a CAD (or any app for that matter) using socket IPC to implement plug-alongs (like plug-ins, but not necessarily owned by a parent process.) (so, if you've seen one, please speak up:) --Eric