Appriciate the input once again Futurulus
The methode like you described it seems logic if you think about it indeed but coverting a vector into an angle using vec_to_angle works good when not adjusting pan, tilt and roll at the same time which is quite difficult in a situation like GL. Therefore you need to inverse pan,tilt and roll to solve that part of the problem but eventually it will lead into inaccurate angles when shiften from normal again due to GL. Anyway, the methode I maded is good enough. It's located in the UR thread

Cheers

Frazzle