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"Bill DeWitt" <the### [at] earthlink net> wrote in message
news:39bc5880@news.povray.org...
|
| I am trying to figure out a way to make correct orbital speeds, but
mass
| interactions of the individual items would be -way- too much for me...
Well I never said I did the math. The Basic program was copied out of a
Astronomy (or Sky&Telescope) magazine back in the late '80s. It shows only
one of the galaxies group of stars, other is considered more a point mass I
guess. Running the program on this 500MHz (in DOS of course) machine it's
not a fast compute for just 100's of stars surprisingly enough. No where
near a real-time display.
Bob
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Bill DeWitt wrote:
>
> Only problem is that although this looks good, it's not right. The
> individual items are orbiting at arbitrary rates, rather than the
> proportionally correct rates.
>
If it's meant to be stars rotating in a galaxy, the function for rotation speed
is quite complicated and based on the mass distribution in the galaxy. It is
not linear of quadratic, etc. in any way.
NTL, it looks good.
Christoph
--
Christoph Hormann <chr### [at] gmxde>
Homepage: http://www.schunter.etc.tu-bs.de/~chris/
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"Bob Hughes" wrote:
> Running the program on this 500MHz (in DOS of course) machine
> it's not a fast compute for just 100's of stars surprisingly enough.
> No where near a real-time display.
No where near a real-time display...?
You are talking about a galaxy - do you realise how slow "real-time" is? ;-)
Rune
--
\ Include files, tutorials, 3D images, raytracing jokes,
/ The POV Desktop Theme, and The POV-Ray Logo Contest can
\ all be found at http://rsj.mobilixnet.dk (updated July 23)
/ Also visit http://www.povrayusers.org
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"Rune" <run### [at] inamecom> wrote in message
news:39bd303c@news.povray.org...
| "Bob Hughes" wrote:
| > Running the program on this 500MHz (in DOS of course) machine
| > it's not a fast compute for just 100's of stars surprisingly enough.
| > No where near a real-time display.
|
| No where near a real-time display...?
|
| You are talking about a galaxy - do you realise how slow "real-time" is?
;-)
Yes. That would be if and when POV-Ray is calculating it all out. I didn't
mean that. We hurt the ones we love most.
Of course I meant as simulated real-time. Best I saw was a 100 star count
flickering extremely noticeably, fewer stars wouldn't look like much so I
didn't even try less than that. 300 goes blink-blink.
The trouble I'm having in the conversion is two fold, firstly the array does
not want to be called after the initialization (inside a while loop) and
secondly how to go about animating a series of frames since the array needs
to be accumulative. Saving them to file might go okay, but the first
problem is insurmountable for me so far.
Bob
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Bill DeWitt wrote:
>
> "Bob Hughes" <per### [at] aolcom?subject=PoV-News:> wrote :
> >
> > Real neat.
>
> Thanks!
>
> > If Dave Blandston can manage to fix up a Basic program array converted to
> > POV script array then we'll be able to do galactic collisions using glow.
> > And if he can't figure it out hopefully someone else can. I haven't given
> > up entirely myself either.
>
> Hmmm... I saw some sort of galactic collision mpeg somewhere... I can't
> imagine the render times.
Someone posted a link a few months back in p.o-t. of a simulation of the
collision between the Milky Way and Andromeda. IIRC it took months of
calculations on a few Crays to do it.
--
Francois Labreque | The surest sign of the existence of extra-
flabreq | terrestrial intelligence is that they never
@ | bothered to come down here and visit us!
attglobal.net - Calvin
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