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I understand from this presentation: http://www.terathon.com/gdc07_lengyel.pdf enter image description here

The focal length (fx) is the first value (e) in all OpenGL projection 4x4 matrices.

How would we get the values of principal point (cx, cy) from this projection matrix? Is it possible? I also know the view matrices.

RJK
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1 Answers1

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The matrix in question describes a central perspective projection. It would seem the principal point of that would have to be (0, 0)…

Michael Kenzel
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  • Is the 0,0 a specific value in the perspective projection matrix? If so, which row and column is it? – RJK Mar 20 '19 at 05:45
  • @RJK depends on the matrix type ... there are more projection matrices out there ... how is this question different from your other one [Is it possible to get principal point from a projection matrix?](https://stackoverflow.com/q/55248431/2521214) – Spektre Mar 20 '19 at 09:53