On 03/13/2018 09:48 AM, Norbert Kern wrote:
> William F Pokorny <ano### [at] anonymousorg> wrote:
> 
> "emission C_Emission" is only used in "makecloud2_demo_sunset.pov" and
> "makecloud2_demo_sunset2.pov". The latter was used as a starting point for my
> scene.
> It didn't catch my eyes.

Ah, I see now too Gilles did have it there. Thanks.

I got a couple small renders done yesterday - with and without the 
emission - and compared them. At a high level adding in emission the 
color of the background sky makes the clouds look as if they are sitting 
in a hazy atmosphere without having modeled the hazy atmosphere. See the 
attached image.

The difference image on the right shows an aspect or pitfall of the 
method - depending on one's goal I suppose. Once one or more color 
channels for the media 'interval' being sampled is maxed out (Red here), 
you get a 'disjoint' color-hue change in the media due the emission 
adder.

> 
> I remember your image - very impressive.

Thanks - though I certainly don't play in your artistic league. :-)

Bill P.

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