[vtkusers] vtkActor2D and layer ordering ?

[Petar Petrov]

I found at least 3 ways that might influence z-order of 2D actors:

1) vtkActor2D->SetLayerNumber(int)
2) vtkImageMapper->SetZSlice()
3) vtkProperty2D->SetDsiplayToBackground/Foreground()

None of which seems to do the job. also previous similar question:
http://public.kitware.com/pipermail/vtkusers/2010-February/057204.html

Before vtk7.0, at least point 3 was working, now in vtk7.0 it also stopped
working.

So my question is how can I influence z-ordering of 2Dactors as per latest
vtk?

Cheers,
Petar
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