"Lars W." <lar### [at] snafude> writes:

> Hi
> 
> I am trying to combine real Images, and POV-Images, and for that i need
> to know
> how to create Objects, that make shadows, but are not seen, i mean they
> must be
> 100 % transparent, but the shadows must be dark.
> 
> Does anybody know if such things are possible with POV-Ray ?
> or maybe knows some alternatives ?

If you don't find any alternatives, contact me. I have hacked the source
code of POV-Ray to allow just what you want: Completely transparent objects
casting black shadows. Additionally, if have created a possibility to 
completely avoid shadows on an object. (This is different from the no_shadow 
keyword. In the latter case, the object doesn't cast shadows, whereas my 
addition removes the shadows from the object.)

I have used these modifications to create my image "twklein"
http://www.fmi.uni-konstanz.de/~willhalm/graphics/tracegallery/index.html

Unfortunately, my hack doesn't work anymore with POV-Ray 3.01, and I guess
that this is also true for the upcoming version 3.1. So you have to stick
with 3.0, if you want to use my modifications. I could provide you binaries
for Solaris, Linux, or SGI, or I can send you the source code.

Thomas

-- 
http://www.fmi.uni-konstanz.de/~willhalm

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