Josh English wrote in message <371F3EEC.1DF566CE@spiritone.com>...
>Thanks, Steve. Luckily I found a method of rolling the scaled sphere, which
does make an ellipse, around
>the origin. What I need now is a method for finding the length of an arc on
an ellipse. I've found
>equations, but they don'tmake much sense to me. I'm still working on it,
though. The arc length is the
>last thing I need to finish the problem.
>


Why do you need the length af an arc? The tangency point problem was the
only one I had. If you've solved that, the circumference formula gives the
forward motion along the ellipse. If you look at my anim, you can see that
there is no "gliding", the ellipsoid rolls correctly.

Margus

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