scott wrote:
> It should be very easy to debug, simply print out (to a file?) the 
> "state" and "derivative of state" information at each step of RK4 for 
> one particle (that starts at zero velocity would make things simpler).  
> eg Just print out position and velocity in the gravity direciton.

Thanks, I got it sorted out.  I still don't know what the error was, but 
switching from preallocating the arrays to allocating new ones every 
step & throwing them away when done solved the problem.

So there must have been some carryover somewhere that I missed.

Anyway, I'll post a binary soon.  I've been going through the forums for 
XNA studio, and apparently there's no easy way to distribute games for 
windows yet (the whole thing is a work in progress, and they're about to 
release yet another version of it).

-- 
...Ben Chambers
www.pacificwebguy.com

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