"Greg M. Johnson" <"gregj;-)56590\""@aol.c;-)om> wrote in message
news:3b18473f@news.povray.org...
> Bob H." wrote:
> >
> > The galaxy collision program I was trying to convert over from Basic to
POV
> >
> > Pretty neat web pages here:
> > http://burtleburtle.net/bob/physics/orbit101.html
>
> When I did a simulation, it looked exactly like the next to last one in
the
> link you shared here. My simulation was simply my flocking algo:  at time
t,
> calculate the gravitational forces on every particle, and use this
acceleration
> to modify the current gravity.  I spent weeks and never got a stable
system, I
> think, because I didn't conserve energy. This, I think would take calcs at
> infinitely small delta t's.   Or maybe something about potential energy,
but
> I'm confused.  Your model would never decay, and allow a stray "Jupiter"
to
> wander into it?  If so, what's the algo?

Egads.  I never said those were my web pages  :-)  Sorry, I didn't think
about the URL saying "bob" in it.
I can only dream to wish I could come up with the math for those myself.
And the galaxy collision simulation was copied from a magazine years ago.

Bob H.

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