Sorry to bring up an older thread but it's about the only one I could find on the topic. I followed the instructions here and this seems to only work in the OctaneRender viewport. The actual rendered output image still saves with a black background, not with the backplate.

Is there a way to have ...

Tha classroom is from a gnomon training dvd.
http://www.thegnomonworkshop.com/store/products/tutorials/asa01/

I believe that technically that gnomon training DVD uses the classroom model created by "REZI-st" that has been freely available online for several years now. I think this is where the ...