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I have a 8-parameter projective transformation, which maps a unit square into a quadrilateral on the plane (green).
Now, I want to “rotate the image by 120 degrees around the local Y axis” (red). So I need a 8-parameter projective transformation, which maps the unit square into that new quadrilateral.
I can create a 3D rotation matrix. My idea was to “turn it” into a projective transform, and combine with the previous transform, but how do I turn it into a projective transform?
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