three.js - How to convert a Matrix4 to a Matrix3 in ThreeJS -

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Do anyone know how to convert matrix 3 to matrix 3 in three JS?

What I'm trying to achieve is 'Inverse sequence rotation' matrix Do I understand that you need to do something like this:

1) Change the camera. Word WINDOWS INWORLD FOR MATRIX3

2) Then invert result

Is that correct? And if so, how do I change from matrix 4 to 3?

Thanks for any help

You can invert the 4x4 matrix . In the upper 3x3 the inverse rotation will be what you want. Otherwise use the set method of 3x3 matrix and assign it the value of your 4x4 matrix.

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