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A comment on Don’t invert that matrix (2010). Parent comment

Re:Don’t invert that matrix (2010) by vvanders on Thursday May 12, 2016 @03:59PM (#11686290)
Ah, that's the context I was missing, thanks!

In games we can usually just transpose the inner 3x3 R+S, invert scale and handle translation similarly to get a semi-quick inverse.

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Re:Don’t invert that matrix (2010) by GFK_of_xmaspast on Thursday May 12, 2016 @04:10PM (#11686367)
This is the difference between matrices that are SO(3) (which have trivial inverses) and matrices that are just GL(n) (which: don't).
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Re:Don’t invert that matrix (2010) by Hydraulix989 on Thursday May 12, 2016 @08:49PM (#11687876)
This. Or you know how to calculate the closed-form inverse a priori like with projection matrices (e.g. gluUnProject).
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