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Rotation angles from matrix


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#1 jtech   Members   -  Reputation: 108

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Posted 01 October 2001 - 08:43 AM

Give a 3x3 rotation matrix that was created using a concatentation order of R=X*Y*Z, how do you extract the rotation angles (x,y,z)? I''ve read you should convert the matrix to a quaternion first, but the explanation didn''t include any code. Anyone have some code handy to do this?

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#2 LilBudyWizer   Members   -  Reputation: 495

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Posted 01 October 2001 - 02:22 PM

I''m not thinking too clearly tonight, but either the rows or columns of your 3X3 matrix are vectors representing the direction and scale of the x, y and z axes. If you use m*v then it is the rows and if you use v*m then it is the columns. That should at least give you a starting point.

#3 jtech   Members   -  Reputation: 108

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Posted 02 October 2001 - 08:32 AM

I can easily get the up, right, and direction vectors from a
rotation matrix (it's just the rows or columns of the matrix),
but I think I would be worst off then trying to figure out
the (rx,ry,rz) rotation angles that created the matrix in
the first place.

Maybe I should ask, how do you arbitrarily extract the
rotation angles from a quaternion?

Edited by - jtech on October 2, 2001 3:33:28 PM

#4 jtech   Members   -  Reputation: 108

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Posted 02 October 2001 - 09:14 AM

Got it!

Gramphics Gems IV: Eulerang.c, Eul_FromHMatrix and Eul_FromQuat.

Cool, both ways.




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