Martin,

I've been playing with your code a little bit and I have a question.

I can see how constraining rotations around a particular axis is useful,
but is it still a trackball at that point? Are trackballs sometimes
constrained like this?

Thanks,
Cory

> I was playing with modjtabaf's spherical manipulator and thought a few 
> features would be useful in Trackball.
>
> This version can lock the rotation of view around the X,Y or Z (model) axis. 
> Mode can be set directly or with modkeys on the mouse movement. 
> The modkeys can be user selected and disabled 
>
> zoom function centres the rotation on a given node and zooms to fill the 
> screen with the node. Not so sure about this one - it requires storing the 
> original node inside TrackBall so it can be reset. Is there a way of doing 
> this by overloading setHomePosition() ?
>
> (changes are against 2.9.4)
>   

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