Basically what I'm trying to do is to use a background that has all elements in it (sky, trees, ground/water), and add a figure (unicorns), more trees, plants, props etc in front of it and have it all look like it belongs in that setting. However, I don't like the floating look. I want perspective shadows. I know I can render the figure with a ground shadow, and then render the background by itself and then put them together inside Paint Shop Pro, but I'd like to avoid doing that if it's possible. I thought this multipass rendering would be the answer.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi