[vtkusers] vtkVolumeMapper::IsoSurface_Blend missing, Real time Isosurface help

[mark.ostroot at lickenbrocktech.com]

Hello,
 
I am trying to implement a real time isoSurface on a volume and I was looking into using the vtkVolumeMapper::ISOSURFACE_BLEND for this application. 
I came across this on the VTK website: https://blog.kitware.com/gpu-rendering-of-isosurfaces/
However in vtk 8.1 Isosurface_blend is not exposed in the vtkVolumeMapper::BlendModes. I was wondering if this has been implemented and exposed in vtk, I know the feature is in paraview at the moment. 
 
Also if anyone has any ideas on implementing a real time Isosurface on a volume I would appreciate any input. 
 
Thanks in advance,
Mark O
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