Robert wrote:

>The last challenge problem generated as much heat as light. Here is
>another. This one is an elaboration of the familiar bouncing ball, often
>used as a beginner's guide to animation.


No particular suggestions on the code as of yet, but I did notice 
that ball clumping is accelerated, and energy levels drop, when 
another event is introduced (in this case a click on the "About" menu 
under the Apple menu.)

Also, there is an inherent flicker in the balls during animation that 
accelerates during clumping. Undoubtedly the GWorlds version 
addresses that.

Ken