In article <3c0e39ec@news.povray.org>, run### [at] mobilixnetdk 
says...

> Of course I haven't tried it, but I think most (maybe all) will impact a
> planet but some might leave the system (that happened in some other tests).

Then you have a problem. They should't be able to do this (unless they 
have a high initial speed) because of energy-conservation.

I tried a similar thing (in C, but 2D), and had the problem that some 
partices that passed the gravity-source in small dinstance tend to gain a 
lot of speed, because the gravity force varies very much in a very small 
area, so the simulation gets unaccurate.

Or maybe some kind of "adaptive iteration step length" could help here.

Lutz-Peter

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