I have been asked to do a collaboration with a Matte Painter.
And she asked for each image/item to be rendered on a separate alpha channel.
So for example, the citadel would be on one image, the bridge on another, the landscape on another render, and then the sky on another render.
BUT the sky/light needs to be like, "bouncing"/"on the objects". so she can paste them together with her edits to them, like additional paint work etc.
EDIT:// I have both Terragen 0.9 and Terragen 2 Deep Edition. I use T2 more. I would get T3 but I don't have the money and the free version limits the size of renders