Hi!

You need to perform the following transformation:

T*A*R*A^(-1)*T^(-1)*M
where

M is your object
T is the object's transform that holds all bthe transformations performed
  on the object till now.
A this matrix brings the center of the object to (0,0,0) if the object was
  not originally created at the origin.
R your rotation matrix

Tell me if it helped.

Boris

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