There's more to bouncing than just a simple decrease in vertical/horizontal
speed. In the case of a ball, for example, bouncing also gives the ball a
rotation (if the collision angle isn't 90 degrees). When the ball stops
bouncing, the ball's rotational momentum keeps it rolling.

Anders

--
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C>2)}torus{1..2clipped_by{box{-2y}}rotate<1 0C>*90translate<D+1A(2)
*2+1#else}cylinder{0(C-v=1).2translate<D+C*A(2)A(4)#end-2 13>finish
{specular 1}pigment{rgb x}#end#end#end-8;1B(445000298)B(519053970)B
(483402386)B(1445571258)B(77778740)B(541684549)B(42677491)B(70)}

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