[vtkusers] Draw polygon around vtkImageSlice?

[Sophonet]

Hi list,

in my previous VTK code I was successfully using 
vtkImageActor::GetDisplayBounds() and vtkOutlineSource etc. to draw an 
outline around the currently shown 2D slice. After refactoring to 
vtkImageResliceMapper and vtkImageSlice, I have not found a matching 
function: vtkImageResliceMapper::GetBounds() contains a comment "Modify 
to give just the slice bounds" and indeed always returns the bounds of 
the 3D input image.

Any suggestions?

Thanks,

     Sophonet