On Tue, 24 Feb 2009 06:16:06 -0400, clipka <nomail@nomail> wrote:
> There are times when I wish for a more realistic (viz: more "channels")  
> color
> model in POV...
>*sigh*

I get that longing every time I use fade_color or absorption.  Unless the  
channels are balanced (not a realistic condition), these effects will  
approach the most dominant primary color.

I first noticed this in simulating sea water: in the shallows, the color  
looked surprisingly realistic, but as it got deeper, the sea turned a rich  
phosphor blue.  I later noticed a similar problem with colored grass:  as  
I attempted to saturate some colors that were washed-out, but of the  
desired hue, golden-yellow became phosphor vermillion, and chartreuse  
became phosphor green.

The capability of extra channels, or even a continuous spectrum, would be  
welcome. However, I don't think this feature would be practical beyond a  
few applications, such as transparent materials.

I created the attached images a few years ago to get a feel for the  
problem, although I didn't feel that anything could be easily done about  
it.  I figured that when it became important enough for me, I'd poll here  
for ideas.  The images use media { absorption } and fade_color,  
respectively.

-- 
<Insert witty .sig here>

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Attachments:
Download 'absorb_bias.png' (18 KB) Download 'fade_bias.png' (17 KB)

Preview of image 'absorb_bias.png'

Preview of image 'fade_bias.png'