I first became interested in geotopographical rendering because of a program called Vista Pro, running on DOS 4.1. Many people ask if these were created with the public domain program for such work now, but I imported the maps in Carrara, which includes some the software from Bryce, which also makes such pictures, but not as well. I imported the map data from NASA's land surveys, which took quite a long time as I was one of the first people to do it. I spoke with a developer for Carrara and he made a plugin to simplify the task, and he sent me a beta. It didn't work and since then he imp;roved the code and made a commercial product, but as I had already figured out how to do it, I din't buy it, so I can't speak for it.