POV-Ray : Newsgroups : povray.binaries.animations : Particle problem Server Time
19 Jul 2024 17:13:51 EDT (-0400)
  Particle problem (Message 1 to 6 of 6)  
From: Hugo
Subject: Particle problem
Date: 8 Sep 2002 14:14:47
Message: <3d7b9397@news.povray.org>
Hey,

I'm trying to make a smooth trail of smoke with Rune's particle system, but
I have a little problem. There are 1400 particles in this animation, for
each of the 3 sticks (so there are actually 1400*3 particles, but they are
just copied from the first stick.) But no matter how many particles I use,
they gather in "bubbles". I use a high particle_steps of 2000 but it doesn't
help.

Rune?

Otherwise it's a nice particle system that is easy to set up.
Good documentation. Sorry that this anim is dull.


Regards,
Hugo


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Attachments:
Download 'ParticleTest.mpg' (92 KB)

From: Rune
Subject: Re: Particle problem
Date: 8 Sep 2002 14:39:27
Message: <3d7b995f@news.povray.org>
I can't tell the cause of the problem from your description. Feel free
to send the scene file to me so I can have a closer look.

(To everyone else: Please note that the particle system is in the beta
stage, and it can not yet be downloaded from anywhere because it isn't
released yet.)

Rune
--
3D images and anims, include files, tutorials and more:
rune|vision:  http://runevision.com (updated July 12)
POV-Ray Ring: http://webring.povray.co.uk


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From: Sir Charles W  Shults III
Subject: Re: Particle problem
Date: 8 Sep 2002 14:40:45
Message: <3d7b99ad$1@news.povray.org>
I'll bet this is a step resolution problem.  In the real world, there are
some unimaginable number of "steps" per unit time, and things are happening in
all of them- therefore, a nice overlap instead of seeing room sized quantum
effects.
    Your artifact is undoubtedly due to your quantum of time - the unit frame.
Perhaps you could calculate the interpolation frames and where those smoke
particles would be and what their diameters would be for the in-between stages.

Cheers!

Chip Shults
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip


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From: Hugo
Subject: Re: Particle problem
Date: 8 Sep 2002 16:42:10
Message: <3d7bb622$1@news.povray.org>
> Your artifact is undoubtedly due to your quantum of time
> - the unit frame. Perhaps you could calculate the interpolation
> frames

I think you're right, thanks.
I thought Rune's system takes this into consideration.
And maybe it does... Anyway I'll send him the file.

Regards,
Hugo


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From: Rune
Subject: Re: Particle problem
Date: 8 Sep 2002 16:55:19
Message: <3d7bb937@news.povray.org>
Hugo wrote:
> I thought Rune's system takes this into consideration.
> And maybe it does... Anyway I'll send him the file.

Yes please. :)

The particles being clustered together in groups should only happen when
a too low step rate is used, and it sounds like you're using a high step
rate, so I'd be interested in seeing the file.

Rune
--
3D images and anims, include files, tutorials and more:
rune|vision:  http://runevision.com (updated July 12)
POV-Ray Ring: http://webring.povray.co.uk


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From: Rune
Subject: Re: Particle problem
Date: 9 Sep 2002 12:53:45
Message: <3d7cd219$1@news.povray.org>
For the reference:

After having seen the scene file, I emailed Hugo my explanation. It
turned out that it was not a problem with the particle engine, but a
slight misinterpretation of the documentation, which implies that I
probably need to make a few things more clear.

Rune
--
3D images and anims, include files, tutorials and more:
rune|vision:  http://runevision.com (updated Sep 8)
POV-Ray Ring: http://webring.povray.co.uk


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