"Bob Hughes" <omniverse@charter%net> schreef in bericht
news:440178d9@news.povray.org...
>
> The problem with having a shadow in there at all seems to be that it
> requires two different ones, since the object itself is actually supposed
to
> be seen two different ways anyhow. So a single shadow only messes with the
> illusion unless you hide part of it, like you've now done. And looking
back
> at your first posted image, it obviously would have been okay, except that
> it seemed the wood pieces mostly laid down across the table instead of
being
> mostly in the air. That shadow really makes the mind think of a
predominate
> way it's oriented all depending on how the shadow is used. Ultimately it
> introduces another dimension into the whole thing so you've got to be
clever
> to add that in as right as possible.
>
> At least, I sure couldn't decide on any better way of going about it after
a
> little puzzling over the picture a while.
>
It is a subtle process. There are different ways in which you can decide to
show the object: As an "impossible" one, with "wrong" shadows (in fact, with
the real shadows); as an "impossible" one, with "right" shadows; or as
something in between. In my first image, I followed a combination of 1 and
3, adding a fake ground shadow to the upper horizontal bar. In all images,
the lower horizontal bar shadow is real, but hiding it makes the object
stand out better.

Thomas

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