"Kenneth" <kdw### [at] earthlinknet> wrote:

>>Likewise, using rgbf <1,0,0,.5> would cast a reddish,
> variable-density shadow.
>

Actually, using rgbft is better; varying f and t produces any shade or
density of shadow.

SO... after *finally* getting around to rendering my "two identical objects"
experiment using an area light, I discovered something interesting: The
order of the two objects in the scene file -- which one comes first --
becomes important. My original test used just a single point light, to
prove the concept; and the order didn't matter.  But with an area light,
the order DOES matter.  The no_image sphere--the one casting the
shadow--has to come first in the code, otherwise NO shadow is produced.
I'll leave it up to more brilliant minds than mine to figure out why that
is so.  :-) But the trick works quite well, even using rgbft as above, with
no shadow problems that I can see.

Ken

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