Is there a way to use this to "undo" the reflection of a normal scene in a
cylindrical surface?

So let's say there is a mirror-finish cylinder along axis y.
One renders an HDRI light probe surrounding it, and you see the reflection all
smooshed in the cylinder.

Can one now take this render (assuming this is all you have to start with, so
you have to start ab initio) and undistort the reflection in the cylinder to get
a clear look at what it's reflecting?


What's the best way to do this?
A user-defined camera looking at the image_map of the render?
A camera looking through the appropriate type of lens at the image_map of the
render?
Somehow just stretching the image_map out based on a function?

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