On 03/13/2018 07:39 AM, Norbert Kern wrote:
> William F Pokorny <ano### [at] anonymousorg> wrote:
> 
> Hi William,
> 
> scene took about 5 days to render with 8000*4500 pixels.
> This worked because I divided the job in three parts - the clouds, a render with
> low radiosity settings (clouds as image_map) and a part render of the head with
> high radiosity settitngs.
> 
> The clouds are df3 media ones by Gilles Tran - see
> http://www.oyonale.com/modeles.php?lang=en&page=36 . He also presented there a
> brief summary of the available methods to create clouds in POV-Ray.
> My only contribution are extreme coloring and a high Intervals value (7 instead
> of 2-5).
> 
> I put a reduced scene file to pbs-f.
> 
> Norbert
> 

Thank you for posting your code I can review and with which I can 
experiment.

I'd played some with Gilles' cloud scene some years back and used a 
variation of his df3 technique to create a Halloween ghost using only 
emissive media. I'm somewhat familiar with the method.

And speaking of emissive media, I see there is:

  emission C_Emission

in your media {} code that I don't recall seeing in the original cloud 
generator method. C_Emission being set to a sky color but at very low 
intensity. Is this something you added?

I've yet to look in detail at media using scattering, absorption and 
emission. The radiosity block has media off so suppose the emissive 
component affecting only the cloud resultant color's in some fashion. 
I'll try to get in a couple renders with and without the emission color 
later today to see what differences pop out.

There is too fog{} I see.

Bill P.

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