[vtkusers] How to use CompassWidget for scene orientation

[Sonya Blade]

Hi Adrian,Thanks for the entry point.
> I just recently used CompassWidget in my ActiViz Application, but I strongly
> believe its the same in c++/py.
> I think you need a vtkOrientationMarkerWidget on top of your vtkAxesActor

Is this totally new widget that has no relevance or anything in common with CompasWidget?If so from which VTK class should I derive the new class? 
Concisely studying your code, it outlines that you embed the AxesActor into newly derived class,the connection with renderer is established by passing vtkRenderer into constructor as reference argument. 
The key point here AFAIU is vtkOrientationMarkerWidget which is supposed to deal with applying the scene transformation to the widget, please confirm?
Regards,
> 1) created a Class having those privates:
>  private readonly vtkAxesActor _actor = vtkAxesActor.New();
>  private readonly vtkOrientationMarkerWidget _widget =
> vtkOrientationMarkerWidget.New();
> 
> 2) constructor with vtkRenderer
> public CoordinateAxes( vtkRenderer renderer )
>         {
>             _actor.SetScale( 0.5, 0.5, 0.5 );
> 
>             _widget.SetOrientationMarker(_actor);
>            
> _widget.SetInteractor(renderer.GetRenderWindow().GetInteractor());
>             _widget.SetViewport(0.0, 0.0, 0.25, 0.25);
>             _widget.EnabledOn();
>             _widget.InteractiveOff();
>         }
> 
> 3) creating your class when your main vtk window is created, I just did so
> upon RenderViewOnHandleCreated() event by
> _orientationAxis = new CoordinateAxes( renderer );
> 
> Thats all I needed to do, updates from your interactive Widget get through
> the renderer/main interactor of your renderer ( SetInteractor() )
> 
> Best Regards
> Adrian
> 
> 
> 
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