(laughs!) Close, Xenic. But it's not even remotely like collision detection. I'm very familiar with "Land to". It's just a pale, fake imitation. Not trying to point out Bryce's flaws. But they DO exist. And I'm starting to need other options in my work. Bryce's "Land to" option is mathematical, based off of positions. It's not based off of polygons, and doesn't detect anything like that. Even with terrains, it's just a shadow of what other apps do. Which is why you can't roll a sphere down a terrain, for example. Hopefully they'll work on that for version Six. Now back to my architectural slavery!