> Ah! Ok, now that you mention it, I suppose I could render the ghosts with 
> a shader that puts 1's in the stencil buffer and 0's everywhere else, and 
> then use the result to do the post-process step.  I never really saw an 
> example of using the stencil buffer, but now that you mention it, it's 
> entirely likely that's exactly what it was intended for. I'll have to 
> study up how you can get a shader to write to it.

The problem is reading from it, AFAIK you can't read from the stencil buffer 
in a pixel shader on most hardware, all you can do is tell the GPU to run 
your shader or not, depending on certain criteria of the stencil buffer.

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