I'm having a mental block at the moment.  This seriously can't be hard...

I'm attempting to render an image_map of a previously traced scene - the
goal of which is to allow me the luxury of rendering a frame/border/special
effect of some sort around the original image.

I need to re-render my image_map such that every pixel traced is correlated
to the original image_map pixel.  How can I set up my image_map (distance
from camera, mainly) to ensure this to be the case?  After some basic math,
I've gotten close, but it's not a perfect match.

Any thoughts?

- How

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