Rotation angles from matrix
Author
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?
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.
Author
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
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
Author
Got it!
Gramphics Gems IV: Eulerang.c, Eul_FromHMatrix and Eul_FromQuat.
Cool, both ways.
Gramphics Gems IV: Eulerang.c, Eul_FromHMatrix and Eul_FromQuat.
Cool, both ways.
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