[vtkusers] How to create a set of "fixed" 3d axes.

[Bob]

Hi everybody,

As I already posted, I'm using VTK to develop a visualization and 3D
editing software, and I would like to add a nice feature that I found
in other similar software. That is, I'd like to show a set of 3D axes
in a fixed position of the display; their purpose it's just to show
the xyz directions while the user explores the scene.

I tried to implement a MouseMove observer that updates the scale and
positon in real time, but the result is not as good as I wish. I also
searched a lot in this list, but found nothing useful for my purposes.

Is there someone who can kindly suggest me a feasible way to achieve
this result?

Tkanks in advance.

Bob.