It sounds like you are trying to make a backdrop along with a ground? If so there are much simplier ways :)

RDNA has "Infinity Cove" and Daz3D has "Cyclorama". They are curved planes that have a back and a ground that are one prop. They are props that use images that are specifically mapped for the template. And the nice thing about these is that they interact with the figures, and other props and lighting so you get more realistic looking shadows etc.

"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