[Insight-users] Euler3DTransform, Rotation Matrix & Initial Parameters - Continued

[N.E. Mackenzie Mackay]

I am trying to initialize Euler3DTransform in order to perform a rigid  
registration.  I have a rotation matrix that I wish to use to  
initialize the transformation.  After reading  
http://public.kitware.com/pipermail/insight-users/2003-November/ 
005506.html it looks like this is impossible, the only way to  
initialize the transformation is to set angles and translation  
explicitly.

If this is the case I was wondering if anyone knew a way to extract the  
3 angles from a 4x4 homogenous matrix?

Thanks
Neilson