I'm curious. Does your particle system have the ability to interact with
outside objects (with trace, naturally)? and does it have the capability to
have the particles bounce off each other as though they were rubber balls?

I ask because while everyone else was working on particle systems, I was
working on my own rubber ball bouncing simulation that i planned on turning
into a particle system. It's 95% finished; the only flaw is that sometimes
balls bounce unrealistically off external objects, but they bounce off each
other almost perfectly realistically. I actually got it to the point where
it's impossible for any two balls to ever intersect; I got them to pile up
in a bowl shaped object at one point.

If you're interested in adding these features before a release, contact me.
It could be a hassle, but I figured I should mention it just in case. I can
post an example anim to p.b.a if you'd like. I assume it's too late though
=)

 - Slime
[ http://www.slimeland.com/ ]

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> I'm curious. Does your particle system have the ability to interact with
> outside objects (with trace, naturally)? and does it have the capability
to
> have the particles bounce off each other as though they were rubber balls?
>
> I ask because while everyone else was working on particle systems, I was
> working on my own rubber ball bouncing simulation that i planned on
turning
> into a particle system. It's 95% finished; the only flaw is that sometimes
> balls bounce unrealistically off external objects, but they bounce off
each
> other almost perfectly realistically. I actually got it to the point where
> it's impossible for any two balls to ever intersect; I got them to pile up
> in a bowl shaped object at one point.

Aww don't just leave us hanging post an animation!!:-)

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Jan Walzer wrote:
> stunning work ...

Thank you. :)

> a good job ... you earn money
> with such things, you know ;)

Hehe. ;)

Well, seriously, it's only free for non-commercial use, so if anybody
wants to use it for a commercial project, I would indeed earn a little
money... (Which of course assumes that people are honest.)

Rune
--
3D images and anims, include files, tutorials and more:
Rune's World:  http://rsj.mobilixnet.dk (updated Apr 14)
POV-Ray Users: http://rsj.mobilixnet.dk/povrayusers/
POV-Ray Ring:  http://webring.povray.co.uk

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GrimDude wrote:
> I read 'beta' and thought I would find a new toy to
> play with on your site. Can't wait to see this puppy,

I send it per email to people who want to help me beta-testing the
system. See my announcement in povray.general on May 9. :)

Rune
--
3D images and anims, include files, tutorials and more:
Rune's World:  http://rsj.mobilixnet.dk (updated Apr 14)
POV-Ray Users: http://rsj.mobilixnet.dk/povrayusers/
POV-Ray Ring:  http://webring.povray.co.uk

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Tony[B] wrote:
> It's looking very very nice, Rune!

Thank you! :)

> I hope we can see v1.0 final in the not-too-distant
> future, and let all those CG Talk guys die of envy. >:)

Weeell, they have their own particle systems I guess. But still, yeah,
I'm gonna announce it there and see what reactions I get. :)

Rune
--
3D images and anims, include files, tutorials and more:
Rune's World:  http://rsj.mobilixnet.dk (updated Apr 14)
POV-Ray Users: http://rsj.mobilixnet.dk/povrayusers/
POV-Ray Ring:  http://webring.povray.co.uk

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Slime wrote:
> I'm curious. Does your particle system have the
> ability to interact with outside objects
> (with trace, naturally)?

Yes, both bouncing and flowing is supported with any objects.

> and does it have the capability to have the
> particles bounce off each other as though they
> were rubber balls?

No.

First of all, rubber balls and particles are not the same. Rubber balls
are individual objects, while particles sort of are the tiny components
of water, fire, smoke or other phenomena. Therefore it does not make
sense to make particles bounce off each other. A particle simulation and
a rubber ball simulation are two different things (though they may have
things in common).

However, it would make sense to have particles be attracted and/or
repulsed by each other for example to create realistic liquid effects
such as water. However, my system does not support that. It is a choice
I made and it won't be supported in future versions either. My system is
not aimed at super-realistic simulations, but is meant to be very
general-purpose so that it can be used for a wide range of effects.
Besides, particle interaction can't be implemented in my system at all,
because the core of my system is based on certain assumptions which
would not be true if there was particle interaction.

> I ask because while everyone else was working on particle systems, I
> was working on my own rubber ball bouncing simulation that i planned
> on turning into a particle system.

But rubber balls are not particles! ;)

A common category that both "particle system" and "rubber ball
simulation" fall into is "physics simulation system". That is probably
what some people actually mean when they say "particle system".

> If you're interested in adding these features
> before a release, contact me. It could be a
> hassle, but I figured I should mention it just
> in case. I can post an example anim to p.b.a
> if you'd like. I assume it's too late though =)

I'm not interested in adding the feature to my particle system, but you
definitely should post the animation anyway! :)

Rune
--
3D images and anims, include files, tutorials and more:
Rune's World:  http://rsj.mobilixnet.dk (updated Apr 14)
POV-Ray Users: http://rsj.mobilixnet.dk/povrayusers/
POV-Ray Ring:  http://webring.povray.co.uk

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> But rubber balls are not particles! ;)


Good point. =) They could sort of be thought of as very large particles,
though, couldn't they? I actually started making this long before I even
started reading posts on this group, so I didn't think of the particle
system idea until after I had started. I figured I could expand it later to
let the user specify vector fields that describe the force on the particles,
and let the user have the option of letting particles bounce or not. I would
also add the ability to let particles create a force on each other based on
their distance apart. Then it could be used for both purposes: a particle
system or a large-visible-object system.

I may or may not actually complete this some day.

I'll post the animation to p.b.a in a minute unless I never restored it
after I reformatted, though I'm sure I've got a backup somewhere if I
haven't.

 - Slime
[ http://www.slimeland.com/ ]

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> I'll post the animation to p.b.a in a minute unless I never restored it
> after I reformatted, though I'm sure I've got a backup somewhere if I
> haven't.

I have it, but it will take me a short time. I have to recompress an
uncompressed video. Just in case anyone's waiting eagerly or something =)

 - Slime
[ http://www.slimeland.com/ ]

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How do we go about downloading your particle system? I couldn't find it on
your site.

Mike

"Rune" <run### [at] mobilixnetdk> wrote in message
news:3ce6df91@news.povray.org...
> My particle system has reached version 0.2 (beta). The system works and
> the documentation has been written, but I'm still working on fine-tuning
> all details and to creating more demo scenes.
>
> So far there are five example scenes included with the system. Frames
> from the demo animations are attached here. This post could be
> considered a brief (and incomplete) summary of more than a years worth
> of work and experiments with the particle system... :)
>
>
> The first animation I ever made with my particle system was one I called
> "Fairies", posted to p.b.a February 2001. It was made using the glows
> feature in MegaPov. Unfortunately it is not possible to make such glow
> effects in POV-Ray 3.5. :(
> But I have tried to make something a little similar which uses media to
> create some glow effects. That animation is included with the particle
> system.
>
> The Wild Hose animation which I originally posted also February 2001 in
> p.b.a is basically the same as it was back then, but with better
> textures than the quick textures I originally used. Having a faster
> computer sure helps a lot in that regard. :)
>
> On March 2001 I also posted an animation with flowing particles. This
> one too has been improved with a better look by making the liquid
> transparent. I also chose to give the liquid a red color to make it
> easier to see.
>
> Since I posted the Smoke Trail animation to povray.binaries.animation in
> February 2001 the smoke has been improved a lot as can be seen in the
> attached image. But I kept the rainbow color effect because - well, I
> like it... ;)
>
> Finally there is the Magic Lamp animation which I posted to p.b.a
> February this year. That one is also included as a demo scene.
>
>
> I'm working on some more demo animations already, but if you have any
> ideas that you'd like to see in a demo animation, I'm open to
> suggestions! :)
>
> Rune
> --
> 3D images and anims, include files, tutorials and more:
> Rune's World:  http://rsj.mobilixnet.dk (updated Apr 14)
> POV-Ray Users: http://rsj.mobilixnet.dk/povrayusers/
> POV-Ray Ring:  http://webring.povray.co.uk
>
>
>

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Michael Goldshteyn wrote:
> How do we go about downloading your particle system?
> I couldn't find it on your site.

That's because it isn't finished and isn't released.

But I send the beta version of the particle system per email to people
who want to help me beta-testing the system. See my announcement in
povray.general on May 9. :)

Rune
--
3D images and anims, include files, tutorials and more:
Rune's World:  http://rsj.mobilixnet.dk (updated May 20)
POV-Ray Users: http://rsj.mobilixnet.dk/povrayusers/
POV-Ray Ring:  http://webring.povray.co.uk

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