Warp wrote:
> 
> Margus Ramst <mar### [at] peakeduee> wrote:
> : As I see it, if the surface is to reflect only pure red, then by definition
> : there should be no reflection (diffuse or specular) of green light. But of
> : course the default specular highlight model in POV works differently.
> 
>   In nature materials are not perfect. They do not "reflect only pure red".
> 
>   This is easier to figure out with black objects. In theory, a black object
> should not reflect ANY light. However, have you ever seen a black object
> without even the slightest highlight and shadow? Even the blackest object
> always reflect some light and that's why you see the shape of the object
> and not only its silhouette.

True. But then these objects are not really black in terms of
the physical model we chose. And similarly, the pure red ball is
a theoretical monster, only found in otherworlds.

-Hans-

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