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"Bald Eagle" <cre### [at] netscape net> wrote:
>
> For general information purposes,
> eval_pigment is a macro that is defined in functions.inc as shown below.
>
> -----------------------------------------------
> #macro eval_pigment(pigm, vec)
> #local fn = function { pigment { pigm } }
> #local result = (fn(vec.x, vec.y, vec.z));
> result
> #end
> -----------------------------------------------
It's always been interesting to me that the macro was designed to work only with
the r-g-b color components, and not with the f and t components as well. I
assume there's a reason for that (a technical one?); but evaluating a color like
rgb <.3,.5,.7,.4,.2> will return just the 'opague' colors, not the "colors +
f-and-t mix."
Or maybe my own logic about 'color mixing' is in error, when it comes to
*translucent* color shades (?). I admit that the effects of f and t on a color
are not the same as, say, adding *white* to get a pastel tint. But eval_pigment,
as-is, gives a kind of false result when working with translucency-- or so it
seems.
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