[vtkusers] The difference between vtk8.1 and vtk.s in volume rendering

[Feng Yang]

Hi Sir.
     I'm working on medical imaging volume rendering with vtk.js in my
application.
     I tried to set the same color and scalarOpacity parameters both in
vtk(C++) and vtk.js. And I thought the result was the same. But It seems
I'm wrong. The output are totally different, Just like the attachments.
     Why is that?
     BTW:
     VTK is 8.1.1
     vtk.js is 7.4.10.

thanks.
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