> What material would be best for a lamp, or "cloth", or  curtain/drapery on
> a window?

The most "realistic" way to handle this may be to use an open cone with
double_illuminate and radiosity so that it brightens things around it. But
that obviously has severe shortcomings: double_illuminate doesn't model the
scattering of light through cloth very well, and radiosity isn't fast.

So, a more practical approach might be to use an object with no_shadow, and
light it manually:

finish {diffuse 0 ambient 1}

Then light will pass through it and it will appear bright. If you want it to
cast a shadow on the room, you can then add another object the same shape
with no_image, and color it with whatever transparency gives the best
shadow.

 - Slime
 [ http://www.slimeland.com/ ]

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