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From: Rune
Subject: Fast sky / clouds
Date: 19 Mar 2002 14:36:17
Message: <3c979331@news.povray.org>
Yet another of those stacked plane cloud methods!

On my website I've uploaded the code for the sky I'm using for my WIP desert
landscape image as seen in povray.binaries.images. I've gotten a request for
the code, and also saw a general request for stacked plane clouds here
recently.

My approach is not the most realistic maybe, but as it uses four planes
only, it renders very fast.

If you're interested, have a look at
http://rsj.mobilixnet.dk/3d/goodies/goodies.html

Please let me know what you think. :)

Rune
--
3D images and anims, include files, tutorials and more:
Rune's World:  http://rsj.mobilixnet.dk (updated Feb 16)
POV-Ray Users: http://rsj.mobilixnet.dk/povrayusers/
POV-Ray Ring:  http://webring.povray.co.uk


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From:
Subject: Re: Fast sky / clouds
Date: 19 Mar 2002 15:31:20
Message: <3c97a018@news.povray.org>
> If you're interested, have a look at
> http://rsj.mobilixnet.dk/3d/goodies/goodies.html
>
> Please let me know what you think. :)

Beside the excellent clouds, the techsphere looks very interesing!
regards
SY


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From: Tim Nikias
Subject: Re: Fast sky / clouds
Date: 19 Mar 2002 16:09:35
Message: <3C97A909.CF9743FD@gmx.de>
You're missing the
global_settings{assumed_gamma 1}!

I never thought of you as THAT kind a guy! ;-)

Otherwise fine enough to use, but I'd say some more
comment on how and why would be useful for POVers
who want to actually know what you're doing.


Rune wrote:

> Yet another of those stacked plane cloud methods!
>
> On my website I've uploaded the code for the sky I'm using for my WIP desert
> landscape image as seen in povray.binaries.images. I've gotten a request for
> the code, and also saw a general request for stacked plane clouds here
> recently.
>
> My approach is not the most realistic maybe, but as it uses four planes
> only, it renders very fast.
>

Fast, yes, no too realistic, yes, but nice and good for beginners...


--
Tim Nikias
Homepage: http://www.digitaltwilight.de/no_lights/index.html


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From: Christoph Hormann
Subject: Re: Fast sky / clouds
Date: 19 Mar 2002 16:20:16
Message: <3C97AB8F.2ACCF39B@gmx.de>
Rune wrote:
> 
> Yet another of those stacked plane cloud methods!
> 
> On my website I've uploaded the code for the sky I'm using for my WIP desert
> landscape image as seen in povray.binaries.images. I've gotten a request for
> the code, and also saw a general request for stacked plane clouds here
> recently.
> 
> My approach is not the most realistic maybe, but as it uses four planes
> only, it renders very fast.
> 
> If you're interested, have a look at
> http://rsj.mobilixnet.dk/3d/goodies/goodies.html
> 
> Please let me know what you think. :)
> 

Looks fairly good for only 4 layers.  And it looks quite a bit different
from the usual 1 layer texture clouds.  

For me personally it usually does not matter that much whether the clouds
take 1 or 10 minutes to render...

Christoph

-- 
POV-Ray tutorials, IsoWood include,                 
TransSkin and more: http://www.tu-bs.de/~y0013390/  
Last updated 18 Mar. 2002 _____./\/^>_*_<^\/\.______


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From: Rune
Subject: Re: Fast sky / clouds
Date: 19 Mar 2002 16:38:47
Message: <3c97afe7$1@news.povray.org>
"Christoph Hormann" wrote:
> Looks fairly good for only 4 layers.

Thanks!

> And it looks quite a bit different
> from the usual 1 layer texture clouds.

I sure hope so.

> For me personally it usually does not matter that much
> whether the clouds take 1 or 10 minutes to render...

That matters very much for me, especially in this case where I need it for
an animation.

Rune
--
3D images and anims, include files, tutorials and more:
Rune's World:  http://rsj.mobilixnet.dk (updated Feb 16)
POV-Ray Users: http://rsj.mobilixnet.dk/povrayusers/
POV-Ray Ring:  http://webring.povray.co.uk


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From: Rune
Subject: Re: Fast sky / clouds
Date: 19 Mar 2002 16:38:49
Message: <3c97afe9@news.povray.org>
"Tim Nikias" wrote:
> You're missing the
> global_settings{assumed_gamma 1}!

Why? It looks awful when I use that setting.

Rune
--
3D images and anims, include files, tutorials and more:
Rune's World:  http://rsj.mobilixnet.dk (updated Feb 16)
POV-Ray Users: http://rsj.mobilixnet.dk/povrayusers/
POV-Ray Ring:  http://webring.povray.co.uk


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From: JRG
Subject: Re: Fast sky / clouds
Date: 19 Mar 2002 16:47:13
Message: <3c97b1e1@news.povray.org>
Of course it does.
First set assumed_gamma 1 THEN code textures (and lights). You'll have to mentally
re-build all your assumptions on colors and finishes, but it's definitely worth it.

BTW very nice sky, esp. since you used only 4 planes.

--
Jonathan.

"Rune" <run### [at] mobilixnetdk> ha scritto nel messaggio
news:3c97afe9@news.povray.org...
> "Tim Nikias" wrote:
> > You're missing the
> > global_settings{assumed_gamma 1}!
>
> Why? It looks awful when I use that setting.
>
> Rune
> --
> 3D images and anims, include files, tutorials and more:
> Rune's World:  http://rsj.mobilixnet.dk (updated Feb 16)
> POV-Ray Users: http://rsj.mobilixnet.dk/povrayusers/
> POV-Ray Ring:  http://webring.povray.co.uk
>
>


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From: Rune
Subject: Re: Fast sky / clouds
Date: 19 Mar 2002 16:57:06
Message: <3c97b432@news.povray.org>
"JRG" wrote:
> Of course it does.
> First set assumed_gamma 1 THEN code textures (and lights).
> You'll have to mentally re-build all your assumptions on
> colors and finishes, but it's definitely worth it.

Nah, there must be more to it than that, maybe display_gamma must be set or
something.

When simply using assumed_gamma 1, the results I get are wrong. A white
pigment in shadow, which should be 10% white looks more like 60% white,
which is way too bright. When I don't specify any assumed_gamma it looks
like 10% white as it should. My monitor gamma is about 2.2, which is the
default.

> BTW very nice sky, esp. since you used only 4 planes.

Thanks!

Rune
--
3D images and anims, include files, tutorials and more:
Rune's World:  http://rsj.mobilixnet.dk (updated Feb 16)
POV-Ray Users: http://rsj.mobilixnet.dk/povrayusers/
POV-Ray Ring:  http://webring.povray.co.uk


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From: Christoph Hormann
Subject: Re: Fast sky / clouds
Date: 19 Mar 2002 17:15:23
Message: <3C97B87B.150C66B7@gmx.de>
Rune wrote:
> 
> [...]
> When simply using assumed_gamma 1, the results I get are wrong. A white
> pigment in shadow, which should be 10% white looks more like 60% white,
> which is way too bright. 

There is no complete shadow in your scene and with a light source of color
rgb 3 you should expect it being bright.

Christoph

-- 
POV-Ray tutorials, IsoWood include,                 
TransSkin and more: http://www.tu-bs.de/~y0013390/  
Last updated 18 Mar. 2002 _____./\/^>_*_<^\/\.______


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From: Rune
Subject: Re: Fast sky / clouds
Date: 19 Mar 2002 17:20:51
Message: <3c97b9c3@news.povray.org>
"Christoph Hormann" wrote:
> There is no complete shadow in your scene and with a
> light source of color rgb 3 you should expect it being bright.

You seem to assume I'm talking about that cloud scene? I'm not. This is my
test scene:

// global_settings{assumed_gamma 1}
light_source {<1,2,-2>*100, rgb 1}
sphere {3*z, 1 pigment {rgb 1}}

Rune
--
3D images and anims, include files, tutorials and more:
Rune's World:  http://rsj.mobilixnet.dk (updated Feb 16)
POV-Ray Users: http://rsj.mobilixnet.dk/povrayusers/
POV-Ray Ring:  http://webring.povray.co.uk


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