Am 05.09.2010 20:14, schrieb rodv92:
> HEllo group, and pov ray gurus i am currently stugggling at making a realistic
> smoke, but whenever i' scale it up, smoke appears completely black and white and
> let's no light throught it, i played with scaling options of emissions but my
> objective it to provide some real transluscent smoke like in realist chimney
> that pump quite low emissions that when we've seen in the 19 century industrial
> chimenys !

Here are a few hints:

- Don't use emission; real-life smoke does not emit visible light. It 
scatters and it absorbs - nothing else.

- For scattering media, always set extinction to 1.0; any other value is 
bogus.

- You'll probably want a /bit/ of absorption. Do use "absorption" for 
that, not the scattering's "extinction" parameter.

- Expect some media types' effects to scale not-quite-linearly. Don't 
expect you can compensate for a "scale 150" simply by a corresponding 
division of emission & scattering parameters; you'll probably need to 
tweak a bit. If you start with a "scale 10" you may get a better feeling 
how scaling affects the media, and how to compensate.

(And finally - I hope I'm not stepping on your toes here - try not to 
type so fast; it may help the legibility of your postings ;-))

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