As I understand the explaination in the docs:
The diffuse value affects the how the object picks up light and appears
itself.  It isn't used to transmit light to other objects, the color (and
therefore, ambient) is used for this.

-tgq


"Bob H." <omn### [at] msncom> wrote in message
news:3bc4b341$1@news.povray.org...
> Only an observation... I noticed how pigment color seems to be the
dominant
> brightness factor for radiosity, and that diffuse might have a upper limit
> or clipping involved which prevents very high values of diffuse from
> contributing to the illumination.
> I had understood that ambient was replaced by diffuse but I didn't think
> there was a limitation of its influence, and yet color doesn't have a
limit
> from what I can tell.
> Well, let me rephrase that.  What I'm saying is that if one object has
high
> diffuse and another doesn't (non-zero though) that you can apply diffuse
> 1000 to the first object and still get no significant brightness change in
> the neighboring object.  However, I think if color is raised to whatever
> high value it does change.
>
> Anyone else care to chime in about that?
>
> Bob H.
> --
> http://webpages.charter.net/omniverse/omniverse.htm
>
>

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