In article <3c560bf0$1@news.povray.org>,
 "Mitchell Waite" <mit### [at] dnaicom> wrote:

> Zeger your explaining is fine. Only thing is what the heck is double
> illuminate flag mean. There is no explaination of it in the povray 3.5 docs.

6.5.9.8 Double_Illuminate
http://www.povray.org/working-docs/id000172.html#6_5_9_8

-- 
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/

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> So the sphere are successively smaller and smaller and in a union. In the
> code below the while statment leads to 10 spheres right? I am not really
that's right.  You'll get as many spheres as you specified in the variable Layers.

> using animation am I as I just see one frame get rendered. So the first
> sphere is scale 125 + 0, the second is 125 + 1/10, the third is 124 "+ /10
> and so on so they are really close together. Seems that I could put 10
> spheres inside eachother in Moray but not sure how to get the double
> illuminate part to work. The pigment could be a material couldn't it, since
> there is nothing changing in the while loop? Excuse me if I seem slow
> figuring this out.
As I said: you could do this in Moray (maybe except for the double_illuminate
modifier),
but it wouldn't be as flexible: you couldn't make test-renders with fewer cloud-layers
without deleting spheres from your scene.

cu!
--
camera{location-z*3}#macro G(b,e)b+(e-b)*(C/50)#end#macro L(b,e,k,l)#local C=0
;#while(C<50)sphere{G(b,e),.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1
;#end#end L(y-x,y,x,x+y)L(y,-x-y,x+y,y)L(-x-y,-y,y,y+z)L(-y,y,y+z,x+y)L(0,x+y,
<.5,1,.5>,x)L(0,x-y,<.5,1,.5>,x)               // ZK http://www.povplace.be.tf

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Thanks Chris that is very useful, now I finally understand. Very powerful
feature.

"Christopher James Huff" <chr### [at] maccom> wrote in message
news:chr### [at] netplexaussieorg...
> In article <3c560bf0$1@news.povray.org>,
>  "Mitchell Waite" <mit### [at] dnaicom> wrote:
>
> > Zeger your explaining is fine. Only thing is what the heck is double
> > illuminate flag mean. There is no explaination of it in the povray 3.5
docs.
>
> 6.5.9.8 Double_Illuminate
> http://www.povray.org/working-docs/id000172.html#6_5_9_8
>
> --
> Christopher James Huff <chr### [at] maccom>
> POV-Ray TAG e-mail: chr### [at] tagpovrayorg
> TAG web site: http://tag.povray.org/

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"Mitchell Waite" <mit### [at] dnaicom> wrote in message
news:3c55c320$1@news.povray.org...
> Thanks for the references, I spent some time looking through them, but I
> could not find any simple cloud pov files. Most where really really
> complicated. What I would like to find is something easy to work with.
>
> Mitch

Write one? :)

Seriously, it's just not a simple task.  Most of the time, I layer several
planes (or stretched discs) at different heights, and the results come out
ok (though not photorealistic).

...Chambers

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3c5591de@news.povray.org...
> Can anyone point me in a direction for making clouds, not the kind that
are
> painted on a surface with a texture map but rather a three dimensional
> floating cloud that has the characteristics of a real cloud. I want to
float
> one over my terrain sculpture.

Try Jaime's clouds here (under "stacked sky"), probably the best cloud macro
available.
http://www.ignorancia.org/galleries.shtml
However, note that while there have been good Povray clouds, there is no
perfect way yet(realistic AND fast AND simple to set up) to create 3d clouds
in Povray.

G.
--

**********************
http://www.oyonale.com
**********************
- Graphic experiments
- POV-Ray and Poser computer images
- Posters

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Gilles Tran wrote:

> Try Jaime's clouds here (under "stacked sky"), probably the best cloud
> macro available.
> http://www.ignorancia.org/galleries.shtml

  Hmmmm.... thanks! But if I remember well Mitchel scene, I think the 
stacked technique is not really appropiated for it, mainly due to the point 
of view (not from bellow). Perhaps media is the only solution for this 
case, IMHO.

> However, note that while there have been good Povray clouds, there is no
> perfect way yet(realistic AND fast AND simple to set up) to create 3d
> clouds in Povray.

 Amen.

-- 
Jaime Vives Piqueres

La Persistencia de la Ignorancia
http://www.ignorancia.org

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Hey thanks Jamie, at least that scene is one I can follow (nice and short).
Do I understand from your comments that the stacked plane approach to clouds
will not let me see a single fluffy cloud if I am looking down from above a
small mountain, e.g. I won't see a cloud floating above the terrain?

So far the only method that I have found that comes close to that is the
technique of using concentric spheres and the special double illumination
flag. Any comments on that technique?

Mitch

PS I like the way your site shows the thumbnails.

"Jaime Vives Piqueres" <jai### [at] ignoranciaorg> wrote in message
news:3c569ba4@news.povray.org...
> Gilles Tran wrote:
>
> > Try Jaime's clouds here (under "stacked sky"), probably the best cloud
> > macro available.
> > http://www.ignorancia.org/galleries.shtml
>
>   Hmmmm.... thanks! But if I remember well Mitchel scene, I think the
> stacked technique is not really appropiated for it, mainly due to the
point
> of view (not from bellow). Perhaps media is the only solution for this
> case, IMHO.
>
> > However, note that while there have been good Povray clouds, there is no
> > perfect way yet(realistic AND fast AND simple to set up) to create 3d
> > clouds in Povray.
>
>  Amen.
>
> --
> Jaime Vives Piqueres
>
> La Persistencia de la Ignorancia
> http://www.ignorancia.org

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Mitchell Waite wrote:

> Do I understand from your comments that the stacked plane approach
> to clouds will not let me see a single fluffy cloud if I am looking down
> from above a small mountain, e.g. I won't see a cloud floating above the
> terrain?

  Well, being based on planes, it works better for viewing directions not 
much paralel to the planes.
 
> So far the only method that I have found that comes close to that is the
> technique of using concentric spheres and the special double illumination
> flag. Any comments on that technique?

  Not tried it, but sounds like a fine solution from Zeger description, and 
seing the clouds on his images, I think it can be appropiated for your 
scene. Being spheres instead of planes, the point of view seems not a big 
problem. Definitely, I must try it someday...

> PS I like the way your site shows the thumbnails.

  Thanks, I tried to make the design simple but also not too boring.


-- 
Jaime Vives Piqueres

La Persistencia de la Ignorancia
http://www.ignorancia.org

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