Direct3D - How do I calculate Roll from View Matrix?

It seems the Wikipedia article about Euler angles contains the formula you're lookin for at the end.

Woohoo, got it! Thank you stacker for the link to the Euler Angles entry on Wikipedia, the gamma formula at the end was indeed the correct solution! So, to calculate Roll in radians from a "vertical plane" I'm using the following line of C++ code.

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