[vtkusers] Rotation about a specific axis

[Chao Liang]

Hi,

I have subclassed vtkInteractorTrackballCamera class, and overloaded mouse
event functions to get what I want. By default, when you rotate the object,
you are free to rotate in any direction.

What I want now is only rotating about one specific axis, say, x, y, z,
respectively. I don't have an idea to do this since I don't know which
class I need to use/subclass.

Do you know which class have such functionality? Any comment will be
welcome and I very appreciate your help. Thanks.

Chao
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