vtkQuadricLODActor doesn't work with depth peeling
Depth peeling translucency works if the actor is of class vtkActor or vtkLODActor. But not if the actor is of class vtkQuadricLODActor.
when the actor is of class vtkQuadricLODActor, it's very slow (depending on max number of peels) and transparency is badly computed.
You can reproduce with a simple scene like https://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/CorrectlyRenderTranslucentGeometry and just modifying the class of the actor
In image, vtkQuadricLODActor
I attached my test file: vtkpeeling.py