Awhile back I was on goodwill's online auction site found this software called Mojoworld. Mojoworld is a procedural 3d world generator software, similar to Planetside Terragen. software the software is quite basic in its approach but it is a lot of fun to use and play around in. you can bring in your own 3d meshes and render them and get surprising results considering how old the software is. here are some of the world I generated and rendered.