Planetside has released Terragen Mac, a scenery generator. The software, compatible with Mac OS X (10.1 and higher) and Mac OS 9.x, is designed for creating photorealistic landscape images and ...

Go here for some free DEM files of the Grand Canyon. There are many Terragen sites with free materials, DEM/surface maps, atmospheres etc. But Timster.net I think is one of the best. Oustanding ...