Rotation of rolling object is zero.

I have an object, which affected by some physics starts to roll.
However, when I check the object->_SIO2Transformation->rot->x,y,z variables, they are all zero.
Any input on this?

Found partial answer from:
http://forum.sio2interactive.com/sio2-engine-f3/how-to-get-transform-from-physic-object-t414.htm
The thing is that when the object has stopped rotating. It would be nice to get the rotation.

You are using Bullet, thats the one who's controlling the matrix... not SIO2...