I'll give it a shot though:
Imagine, in the top view, you have a lift hill that's at a 45 degree angle to the grid lines, as well as at a 45 degree angle to the ground, with vertexes equally spaced. Now pretend you wanted to make the lift hill concave down (so it's steep at the bottom and middle and less steep at the top, like a regular lift hill). So you go into one of the side views and move the vertex at the top end straight to the right a little, so the last segment has a less steep angle. Unfortunately, since the lift hill is at a 45 degree angle to the grid lines, *the plane that you're moving the vertex along is NOT the same plane that the lift hill is in.* It is actually at a 45 degree angle from the plane of the lift hill.Thus, when you go back to overhead, the lift hill will not be straight, even though it looked great in the side view.
I've found it easier to create all your pieces in overhead and then go to a side view and ONLY move things vertically up and down. If you move them left and right, you'll mess up your overhead (unless everything on the overhead was at a perfect 90 degree angle). Then do tiny touch ups in 3D. If you do any serious editing in 3D it will undoubtedly mess something up because the plane of editing is so goofy.
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The legend lives!
*** This post was edited by evilcoasterrider on 2/6/2002. ***
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