I added the one sided wall 1st and then imported the background. When I imported the background the wall became invisible even though it was still there. Should it do that? This is the 1st time using a primitive and importing a background so I don't know if that is normal or not.

For the rendered image you seemed to indicate that part of the background should be covered up, which did not happen. I'm afraid that when it comes to doing these things, I seem to have no clue as to what I should be doing. Can you help? Sorry to be such a clueless pain in the butt :blushing: .