Now, following along with that whole thing, doing the Norbert Kern thing would
function as a check on the whole photogrammetry process.
If we made a nice, simple test scene with well-defined, easily visible reference
points, and known 3D locations, then every step of the photogrammetry
back-projection - the undoing of the projection matrix that make the image,
would be able to be matched up with planes and rays and vectors and points -
like checking the manual solution to a math problem with a calculator.
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