How do I convert a matrix to a rotation vector?

[MenDAKE]

TV seems to have plenty of functions to convert a rotation axis to a matrix or quaternion, but I can't seem to find any functions to do convert FROM a matrix or quaternion to a rotation axis. Am I overlooking something? I'm using C#, but any help in any language would be appreciated.

[SalatalikTursusu]

hi mendake,

first of all it seems you are working on rotations ... let me quide you to following post for detailed rotation informations : http://www.truevision3d.com/phpBB2/viewtopic.php?t=6136

secondly i will recommend you to use axiom.mathlib for matrix , quaternion , vector and such operations ... it's for c# and very good math library.

for a rotation example in c#, you can look at http://www.truevision3d.com/phpBB2/viewtopic.php?t=6045 ... this is very good sample for both programming structure and rotation examples ...

and for exracting rotation axis ; http://www.truevision3d.com/phpBB2/viewtopic.php?p=41760#41760 ... there are links for information on matrix & quaternions ...

[MenDAKE]

Thanks very much. I appreciate the help!

[JohnPierre]

hey mendake, all you really need to know is that the information is already in the correct form, no conversion neccessary. all you need is

(i don't know C# but this should still be legible)

anglevector = vector(matrix.m31, matrix.m32, matrix.m33)

those are the x, y, and z rotations contained within the matrix

hope that helped

johnpierre