Basically if you ever tried creating an animated pivot control, you will notice that once the object has been rotated and it's rotatePivot point has been shifted and repositioned; once the object get translated we see some weird transformation. These unwanted transformation can be fixed by calculating the offset values in the rotatePivotTranslate matrix.
To give you a better idea on this please take a look at this little tutorial post :)
Also, Maulik has been working on this offset solution to create a real time animated pivot which you can find in his blog. Below is the link ... and a big thanks to Maulik :)
Making Animatable Pivot
