I suspect 2 main reasons: 1) We do not use the C4D engine as a plug in, we integrate it fully and engineering manually hooks in all the components for each release. It is not drag/drop. 2) MOST LIKELY (I do not know this for a fact, I've just seen evidence) our agreement with Maxon to license the C4D rendering engine may preclude us from allowing alternative third party renderers. I will see if this is something I can verify. Regardless of the first two, adding this thread to the existing