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Mark, As Chris says, you've got the right idea on steps 1 and 2. At least that's what I did using RTAG on a simple "roller coaster" animation, and it worked quite well. Sharp turns can get the view swinging wildly left/right, though. As for rolling, you're on your own. "2nd derivatives" require digging too far back for me. (It has occurred to me many times that if I knew about POV-Ray and Polyray in highschool, I would've paid much more attention in calculus class.) Another problem I ran into is acceleration control. I just don't see how to do it using splines, which seem to want to interpolate a fixed number of evenly spaced points between control points. (I think oversampling might be an answer, but I never tried it.) If you or anybody else has ideas on this, I'd love to hear 'em. Good luck. Oh, here's another tip if you're not doing it. Use one of the new POV-Ray wireframe modelers to rough out your scene and place spheres for spline control points. It's the quickest way to visualize your flight path. Yours, Douglas There is 1 Reply. Read action !