[vtkusers] How to apply different light to frontface and backface in VTK

[qinyang_1980]

Hello,

For now, 
I need apply intense light to the frontface of mesh, 
and apply low light to the backface. 

Therefore, the user can see the frontface of mesh clearly.

But I could not find a easy way to do this in VTK.
In MeshLab, this behaviour is default.

Can somebody tell me how to do this in VTK ?



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