Smoke/steam effect in pov?

Smoke/steam effect in pov?

Post by Roo » Thu, 25 Nov 1999 04:00:00



Hello,

Is anyone aware of any way to make smoke or stean similar to that which would
be coming from an industrial cooling tower or smoke stack of substantial size
in povray?

I'm looking for something that acts in a way that is similar to fog in povray,
but more 'billowy' in a cumulus cloud sort of way.

I am not used to media (not really messed with it) and I think thats how its
going to have to be done, halo was easy...

Thanks,ian

 
 
 

Smoke/steam effect in pov?

Post by Mark Stoc » Thu, 25 Nov 1999 04:00:00


Ian,

I couldn't tell you how to set all of those POV parameters, but
I have found that one of the biggest barriers to decent-looking
smoke in most any computer-generated image is the overall shape
of the smoke volume, which is strongly tied to correct velocities
in and around the flow.

There are ways to simulate the flow from a smokestack in a very
realistic manner, with all of the billowing that one would expect,
but the method is rather difficult to implement, and has only
been done recently. It is based on a 3D vortex lattice code, which
is an implementation of potential flow principles. If you
are really interested, look for books on Aerodynamics/Hydrodynamics
or Panel Methods.

Rendering the results is a completely different story.

Mark

: Is anyone aware of any way to make smoke or steam similar to that which would
: be coming from an industrial cooling tower or smoke stack of substantial size
: in povray?

: I'm looking for something that acts in a way that is similar to fog in povray,
: but more 'billowy' in a cumulus cloud sort of way.

 
 
 

Smoke/steam effect in pov?

Post by Ken » Thu, 25 Nov 1999 04:00:00



> Ian,

> I couldn't tell you how to set all of those POV parameters, but
> I have found that one of the biggest barriers to decent-looking
> smoke in most any computer-generated image is the overall shape
> of the smoke volume, which is strongly tied to correct velocities
> in and around the flow.

> There are ways to simulate the flow from a smokestack in a very
> realistic manner, with all of the billowing that one would expect,
> but the method is rather difficult to implement, and has only
> been done recently. It is based on a 3D vortex lattice code, which
> is an implementation of potential flow principles. If you
> are really interested, look for books on Aerodynamics/Hydrodynamics
> or Panel Methods.

> Rendering the results is a completely different story.

> Mark


Take a look at this site for POV-Ray implemented billowing smoke clouds:
http://www.geocities.com/SoHo/Workshop/9193/index.html

Source code available

See also an include file for POV-Ray called smokegen.
http://www.studenter.hb.se/~arch/smokegen/smokegen.htm

--
Ken Tyler -  1200+ Povray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/

 
 
 

Smoke/steam effect in pov?

Post by Mark Stoc » Thu, 25 Nov 1999 04:00:00


Ken,

I may have mistaken the intent of Ian's e-mail, but I believe he
may have already seen the images and software you mention, and
is looking for something better. In my opinion, strike.jpg is
among the best representations of fractal forgery of a volume
of smoke, but it is, in no way, billowing. It is merely blobs and
spheres of fractal smoke with no swelling, surging, or motion
inherent. It is exactly this motion that gives a large cloud or
steam from a cooling tower its billowy look, and it is exactly
that that every raytracing of smoke is missing.

Mark

:>
:> I couldn't tell you how to set all of those POV parameters, but
:> I have found that one of the biggest barriers to decent-looking
:> smoke in most any computer-generated image is the overall shape
:> of the smoke volume, which is strongly tied to correct velocities
:> in and around the flow.

: Take a look at this site for POV-Ray implemented billowing smoke clouds:
: http://www.geocities.com/SoHo/Workshop/9193/index.html
: Source code available

: See also an include file for POV-Ray called smokegen.
: http://www.studenter.hb.se/~arch/smokegen/smokegen.htm

 
 
 

Smoke/steam effect in pov?

Post by Phil Ha » Thu, 25 Nov 1999 04:00:00


Have you tried using halos? I've gotten some good cloud/billowy effects
from them. Try using high turbulence then stretching them out a bit to
get the column effect.



Quote:> Hello,

> Is anyone aware of any way to make smoke or stean similar to that which would
> be coming from an industrial cooling tower or smoke stack of substantial size
> in povray?

> I'm looking for something that acts in a way that is similar to fog in povray,
> but more 'billowy' in a cumulus cloud sort of way.

> I am not used to media (not really messed with it) and I think thats how its
> going to have to be done, halo was easy...

> Thanks,ian

 
 
 

Smoke/steam effect in pov?

Post by Ken » Thu, 25 Nov 1999 04:00:00



> Thanks Mark and Ken!

> <<I may have mistaken the intent of Ian's e-mail, but I believe he  may have
> already seen the images and software you mention, and is looking for something
> better.>>

> I was wishing for something billowy and that could possibly be animated, but
> the media looks as if it will have to work for now, for the stills.

> Guess I'll have to learn how to use particles in cinema4dxl or studiopro for
> the animation.

> Does anyone have any really good dark storm type skies? (black or dark grey)

> thanks,ian

Your welcome to play with this to see what you can come up with. Right
now it is more of a nuetral gray color but with a few adjustments to
to the color maps youi might be able to get what you need.

Sorry about the formatting. I don't have time to clean it up for you.

   sky_sphere{pigment{gradient y color_map{[0.0 rgb .8][1 rgb<.2, .3 .6>]}}
    pigment{bozo turbulence .7 octaves 7 omega .49876 lambda 2.5432
    color_map{[0 rgbf<.9,.9,.9,.1>][.4 rgbf<.95,.95,.95,.9>]
    [.7 rgbf<1,1,1,1>]}scale .60 scale<20,.2,.2>}}

   plane{y, 1000 hollow pigment{bozo turbulence 0.3 omega 0.7
    pigment_map{[ 0.750 bumps turbulence 0.3 omega 0.7 color_map{
    [0 rgb 1 ][1 rgb .7]}scale .4]
    [.875 rgb<.9,.9,.8>filter 2][.950 rgb 1 transmit 1]}
    translate 1*x scale 4000 translate-150*z}
    finish{ambient .5 specular 1 roughness .01}}

--
Ken Tyler -  1200+ Povray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/

 
 
 

Smoke/steam effect in pov?

Post by Roo » Fri, 26 Nov 1999 04:00:00


Thanks Mark and Ken!

<<I may have mistaken the intent of Ian's e-mail, but I believe he  may have
already seen the images and software you mention, and is looking for something
better.>>

I was wishing for something billowy and that could possibly be animated, but
the media looks as if it will have to work for now, for the stills.

Guess I'll have to learn how to use particles in cinema4dxl or studiopro for
the animation.

Does anyone have any really good dark storm type skies? (black or dark grey)

thanks,ian

 
 
 

Smoke/steam effect in pov?

Post by Phil Clut » Fri, 26 Nov 1999 04:00:00


Give Smokegen a try:
http://www.studenter.hb.se/~arch/smokegen/index.htm
--
Phil
...coffee?...yes please! extra sugar,extra cream...Thank you.
 
 
 

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