Clint Brewer wrote: > Thanks for the code Erwin, > I'll try it out, > > I agree on the aabb stuff, I think for right now I just want the real > rough visibility determination, so aabbs should be nice and fast. Have you seen this before: http://www.geocrawler.com/archives/3/4856/2000/9/0/4425365/ ? (Or is the aabb_test that Erwin referred to based on that?) - Bruce