...also I tried making a terrain version of a simple gear (above) by rendering its image in white-on-black then importing the image into the terrain editor. It produced a nice object, but with 32,768 polygons. the original object, made from extended primitives, was 456 polygons. I guess it'a a matter of personal preference, but I like to put a lot of detail into scenes, and I'm always on the lookout for space-reducing schemes. I would still be interested in low-poly 'primitive' shapes of this sort.