I'm rendering something as a preview for building it.  So, I 
plan to combine it with a photograph of my back yard and 
compose the ray-traced gazebo into it.  I can get the angles 
and perspective and shadow angle to match OK, just by taking 
enough measurements and keying off of a flat template of the 
octogon shape in the real photo.

My question is: wasn't there talk of some feature, a long 
time ago, about rendering a "mask" from a scene?  Basically, 
I could use that to punch out the location in the photo.  I 
get pretty close by using a constant background color and 
selecting that in PhotoShop. But I seem to remember talk 
about generating a mask layer directly.

The interesting part, that I need some help with, is dealing 
with the shadows.  Assuming I put my object into a scene 
that has props for the real objects the shadows will fall 
on, how can I copy those in Photoshop to darken the photo?

--John

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