Christian Froeschlin wrote:

> if the setup is such that you can restrict yourself to a finite
> rectangle in the plane

oh and if not, and the reflecting surface is always reasonably smooth,
you can probably repeat warp the gradient pattern and fix the wrapped
coordinates using some floodfill like postprocessing, start with a
reasonable pixel where the information is certain to be from the
"master" rectangle, then move up and down, adding an offset of
256 or 65536 where an obvious wrap occurs. Once the center column
is processed do the same thing horizontally for each line.

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