CompuServe Messages

I have rendered a Martian landscape in Vistapro and would like to composite elements from 3DS into my Vistapro rendering, e.g. build a Mars base in 3DS and put that into the landscape. I tried importing a DXF landscape from Vistapro into 3DS and applied a texture map from Vistapro to get the proper landscape color. I could not get the color to look good in 3DS and of course many elements from the Vistapro landscape were missing, such as the lake, trees and clouds. How can I use an image as-is from Vistapro and composite elements modeled and rendered in 3DS into it? Thanks for any help. Jay