In article <3a969cf1@news.povray.org>, "Rune" <run### [at] inamecom> 
wrote:

> I thought so too at first, but it doesn't appear to work that way. The
> particles come very quickly to a complete stop. :(

You need to give the particles a very *high* rebound in order for them 
to keep going...I think the only good way to do this will require 
inter-particle forces and/or particle-ground forces. I've done a system 
like this before which didn't do any collision detection, just 
avoidance: I had the ground repel the particles, so they hovered 
slightly above it and constantly slid downhill, taking the easiest path.

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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Hi Chris, I downloaded MegaPovPlus, the documentation and the sample files.

The executive worked fine, but more than half of the particle_system sample
files generated errors and the help files were in an unknown file format; I
presume they are not for Windows.

Is there any chance of getting the scene files working and have
documentation for Windows made (html will be fine) ?

> I posted some images and animations on these groups a while ago

My cache doesn't go back that far. Is there anywhere else I can see sample
animations?

> and somebody used it in an image of some odd robots spraying
> stuff at a mutated rug/chicken thing.

Yes, I remember that one. By Margus Ramst IIRC.

Rune
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"Chris Huff" wrote:
> You need to give the particles a very *high* rebound in
> order for them to keep going...

Yes, but then it wouldn't be flowing.

> I think the only good way to do this will require
> inter-particle forces

Not an option in this case.

> and/or particle-ground forces.

I've experimented a little with this. So far with no success, but I still
have a few ideas to try out.

Does the particle_system patch support flowing? If yes, how is it
implemented?

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 January 28)
/ Also visit http://www.povrayusers.org

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In article <3a96b409@news.povray.org>, "Rune" <run### [at] inamecom> 
wrote:

> The executive worked fine, but more than half of the particle_system 
> sample files generated errors

Yeah, I know...I was getting rather sick of the particle system patch, 
and didn't have time to even test all the demo files. :-(
I'm writing new ones for the next version, those were more of feature 
tests for the in-development versions.


> and the help files were in an unknown file format; I presume they are 
> not for Windows.

They are plain text files, the problem is that Mac and Windows have 
different line endings.


> Is there any chance of getting the scene files working and have
> documentation for Windows made (html will be fine) ?

Well, you can find a decent text editor that can handle the different 
line endings, or wait for the new version which will be in HTML to get 
around this problem.


> > I posted some images and animations on these groups a while ago
> 
> My cache doesn't go back that far. Is there anywhere else I can see 
> sample animations?

I'll put some more up when I update my web page, sometime soon 
(hopefully this weekend). The only images on my web site now are:
http://homepage.mac.com/chrishuff/images/particleFountain.jpg
http://homepage.mac.com/chrishuff/images/particleFountain2.jpg

(and just uploaded this one)
http://homepage.mac.com/chrishuff/images/Particles1.jpeg


> > and somebody used it in an image of some odd robots spraying
> > stuff at a mutated rug/chicken thing.
> 
> Yes, I remember that one. By Margus Ramst IIRC.

Yeah, that's it. Titled "Absurd".
http://www.hot.ee/margusrt/eng/absurd3.html

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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In article <3a96b900@news.povray.org>, "Rune" <run### [at] inamecom> 
wrote:

> "Chris Huff" wrote:
> > You need to give the particles a very *high* rebound in
> > order for them to keep going...
> Yes, but then it wouldn't be flowing.

If you have a large enough number of particles, they can appear to flow. 
It works best when the particles are going downhill, though. And you 
have to start them out close to the ground, and keep the bounce height 
from decreasing too much, but if they bounce too high, they won't look 
right.


> > I think the only good way to do this will require
> > inter-particle forces
> Not an option in this case.

I know...I once did a particle system with inter-particle forces in 
plain POV-Script...I gave up after a couple multi-hour *parses*. The 
thing was impossible to test, because it took so long to see any results.


> > and/or particle-ground forces.
> I've experimented a little with this. So far with no success, but I still
> have a few ideas to try out.

I'll look around, maybe I still have that scene file around.


> Does the particle_system patch support flowing?

Not yet.


> If yes, how is it implemented?

I'll probably implement a kind of force based on object proximity...that 
should allow flowing to work.

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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"Chris Huff" wrote:
> Yeah, I know...I was getting rather sick of the particle system
> patch, and didn't have time to even test all the demo files. :-(
> I'm writing new ones for the next version

Sounds good.

> > and the help files were in an unknown file format; I presume
> > they are not for Windows.
>
> They are plain text files, the problem is that Mac and Windows
> have different line endings.

That was not the problem, I just didn't know that they were plain text
files, since they had no extensions.

> The only images on my web site now are:
> http://homepage.mac.com/chrishuff/images/particleFountain.jpg
> http://homepage.mac.com/chrishuff/images/particleFountain2.jpg
>
> (and just uploaded this one)
> http://homepage.mac.com/chrishuff/images/Particles1.jpeg

Thanks.

I've been looking at the particle_system patch documentation and I'd say
that my system is currently more flexible. However, when some of your
planned features are added, I think they will be much the same. And your
patch is much faster. But still the "user-interface" is very different and I
personally prefer mine, so I'll keep working on it... :)

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 January 28)
/ Also visit http://www.povrayusers.org

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In article <3a96d458@news.povray.org>, "Rune" <run### [at] inamecom> 
wrote:

> That was not the problem, I just didn't know that they were plain text
> files, since they had no extensions.

Oh...file name extensions. Those silly things. ;-)


> I've been looking at the particle_system patch documentation and I'd 
> say that my system is currently more flexible. However, when some of 
> your planned features are added, I think they will be much the same. 

In what ways do you think it could be improved? I'm just fishing for 
ideas...
BTW, one of the changes I plan on doing is separate environment objects, 
each with their own elasticity and other particle interaction 
characteristics. You could have portions of what appears to be a smooth 
wall but is really a pair of objects, one with more "slippery" 
characteristics, the other with "sticky" characteristics, so particles 
would stick to some parts of the wall but not others. You could spray 
paint the wall and have an invisible message appear.


> And your patch is much faster. But still the "user-interface" is very 
> different and I personally prefer mine, so I'll keep working on it... 

I'll be interested in the results...

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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in the words of my significant other - looks like slime :)


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Rick

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As i understand it you could simulate some kind
> of flowing by making the particle lifetime high enough and using a high
> energy loss when bouncing.

I think this could work with collision detection.

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Rune wrote in message <3a9581f3@news.povray.org>...
>Hope you like it!

Oh, yeah!
I got it looping on my other box right now.

You definitely have 'something' happening here.

I have to check your other posts and peoples responses, as
well as your web site.

So much to do and only a lifetime to do it.

Thanks,
Peter

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