SWEET!  That's absolutely cool.  And I agree; the retro techno grid 
look, as you call it, is really appealing.  (Tron rocks!) 

Too bad we can't see more of the ball spinning into oblivion in the 'hat.

Great animation.
-Law

None wrote:

>Some more test, Ball rolling on a quartic WitchHat, initial velocity +x only
>(with matching initial -z angular velocity).
>
>Something really appeals to me about that retro techno grid look.  It
>reminds me of the computer images that used to spark my imagination when I
>was much younger.  It must be part of that Tron nostalgia.  Unfortunately
>MPEG hates clear and sharp lines so it heavily dims them, to the point where
>they are quite washed out, and makes a file bigger than it should be,
>despite the I frames having been reduced to a minimum.
>
>The balls' orientation is now stored as a quaternion.  My previous sphere
>rolling attempts never worked quite right.  That rotating on the surface of
>the sphere idea of mine was way off.  That is why I investigated
>quaternions.  It's surprisingly easy to incrementally roll a quaternion and
>the calculations are minimal so precision remains quite high.
>
>
>  
>

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