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.
  If even black objects reflect some light, then non-black objects reflect
even more easily.

-- 
char*i="b[7FK@`3NB6>B:b3O6>:B:b3O6><`3:;8:6f733:>::b?7B>:>^B>C73;S1";
main(_,c,m){for(m=32;c=*i++-49;c&m?puts(""):m)for(_=(
c/4)&7;putchar(m),_--?m:(_=(1<<(c&3))-1,(m^=3)&3););}    /*- Warp -*/

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