Well, they apparently can... The editor of CGNetworks said "no prefab models" for the DEM question. I'm arguing over there with him about Bryce and Mojoworld and his tone is starting to get up my nose. To quote freely, "If your peers/jury see you're using Vue/Bryce, your picture will rank very low." BTW, about parametric models, a guy asked "what about spheres, cubes, cones, planes?" :-)

-- erlik