I ended up getting this to work in https://github.com/pyvista/pyvista/pull/367 by using 2 layers of vtkRenderers. I only run the EDL shading pass on the renderer layer with data and leave another renderer to hold all the axes grid, scalar bar, etc. actors.
One problem I’m running into right now is how the axes grid appears above the data in the scene when it should be behind.
