How to fix rotating center?

Hi,

Middle mouse button click will fix the rotation center. Please refer the attached image.

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You can not fix the rotating center using the mouse. Every time you middle click to rotate, this will select a new rotating center.

What you can do if this disturbs you is:
- use a 3D space mouse: in this case, the '2D'mouse middle click will  fix the rotation center, the 3D mouse will do the rotation
or
- choose under File|Preference|System a different Mouse setting. FOr example, 'Hyperworks 13.0' allows to choose the rotation center and rotate separately, like in Altair HyperMesh.

Thanks Alessio for your solutions.

So, if I want to separate Rotation Center and Rotation, I will use HM setting.