It sounds very interesting, especially the interface part. Worldmachine creates great terrain but it's not easy to master it. I am always in favor of "human" interfaces. One more question, you mention a brush, will it be possible within GeoControl to paint things like a road, river, etc, or will a paint program still be required for this? Even better would be if there could be a wizard that creates randomly things like roads and rivers - but maybe I am asking too much for $50 ;-) Finally a thing that I always wished it was possible with terrain generators: to paint material areas over it, to assing different materials to. Say for instance I make a terrain, then paint part of it in red part in white and when it comes out it is an OBJ with a MTL file that specifies two different textures for it. It would be easy, then, in the final application, to replace the textures with full materials (procedural or not). How about it? :-)