Hi all,
i have a driving car in the desert. How can i make a dust cloud behind the
car.
I'm not so familiar with all texture possibilities and need a hint.
I thought about a cone with a half transmission but it's too regular and
really a cloud.
thx
Alex

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> I'm not so familiar with all texture possibilities and need a hint.
> I thought about a cone with a half transmission but it's too regular and
> really a cloud.

You could take a particle system, e.g. Rune's (www.runevision.com) or mine
(www.nolights.de) and use those to place lots of spherical particles filled
with media, or discs facing the camera, with a transparent rim and slightly
less transparent center.

Hope that gives you a start,
Tim

-- 
aka "Tim Nikias v2.0"
Homepage: <http://www.nolights.de>

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Alexander Nagel nous apporta ses lumieres en ce 2005-11-27 10:02:
> Hi all,
> i have a driving car in the desert. How can i make a dust cloud behind the
> car.
> I'm not so familiar with all texture possibilities and need a hint.
> I thought about a cone with a half transmission but it's too regular and
> really a cloud.
> thx
> Alex
> 
Another way: (normaly, you can't see individual particles in the dust cloud)
Start with an object with about the shape you want, a blob should be a good start.
Now, make it totaly transparent: texture{pigment{ rgbt 1}finish{ambient 0 diffuse 0}}
Make it hollow: add the "hollow" keyword.
Fill it with media. Make the media scathering. Try several pigments as density and add
some turbulence.
You can use the cone filled with media close to the tires and merge it with a blob
some distance 
away from the car.
Please note that scathering media is the slowest kind of media.
DON'T use high intervals value, increase the samples count instead. MUCH faster!
That's for the 
default media sampling method.
If the dust is to transparent, you can increase the density, one (1) is not the
maximum, there is no 
maximum.

-- 
Alain
-------------------------------------------------
It doesn’t matter what you do. It only matters what you say you’ve done and what
you’re going to do.

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Alexander Nagel <feu### [at] webde> wrote:
> i have a driving car in the desert. How can i make a dust cloud behind the
> car.

  I'm sure you can adapt this technique for your needs:

http://www.oyonale.com/ressources/english/sources13.htm

-- 
                                                          - Warp

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Am Sun, 27 Nov 2005 16:54:41 +0100 schrieb Tim Nikias:

> You could take a particle system, e.g. Rune's (www.runevision.com) or mine
> (www.nolights.de) and use those to place lots of spherical particles filled
> with media, or discs facing the camera, with a transparent rim and slightly
> less transparent center.
> 
> Hope that gives you a start,
> Tim

It seems it is a bit more complicated than i thought.
thanks for your help.
Alex

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Am Sun, 27 Nov 2005 11:42:43 -0500 schrieb Alain:

> Another way: (normaly, you can't see individual particles in the dust cloud)
> Start with an object with about the shape you want, a blob should be a good start.
> Now, make it totaly transparent: texture{pigment{ rgbt 1}finish{ambient 0 diffuse
0}}
> Make it hollow: add the "hollow" keyword.
> Fill it with media. Make the media scathering. Try several pigments as density and
add some turbulence.
> You can use the cone filled with media close to the tires and merge it with a blob
some distance 
> away from the car.
> Please note that scathering media is the slowest kind of media.
> DON'T use high intervals value, increase the samples count instead. MUCH faster!
That's for the 
> default media sampling method.
> If the dust is to transparent, you can increase the density, one (1) is not the
maximum, there is no 
> maximum.

Nice idea. I'll try that. Rendertime is not that big problem. I have a
pretty fast box.
But the cloud scenes from Warp take a long time to render.
thx
Alex

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Am Sun, 27 Nov 2005 12:54:34 -0500 schrieb Warp:

> Alexander Nagel <feu### [at] webde> wrote:
>> i have a driving car in the desert. How can i make a dust cloud behind the
>> car.
> 
>   I'm sure you can adapt this technique for your needs:
> 
> http://www.oyonale.com/ressources/english/sources13.htm

Wow, really cool.
But it takes a long time to render.
Meanwhile you can increase the earth' population ;-)

thx
Alex

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