I suspect a rotation around Y tends to work better than Xrot.  This scene was made several years ago using a cylindrical hill and road.  Because you expect to see lines converging with distance, the *radial* convergence doesn't look out of place in the animation.

I accidentally left a couple of wrongly lighted frames in the loop, which spoiled the loopness, but the cylinder is the point here! :)

http://ockhamsbungalow.com/blog22/Ride-bike.swf

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