[vtkusers] Problem with shadows

[abcd efgh]

Hello,

I am new to vtk. I have a 3D polydata, I cut it using vtkClipPolydata.
Now there are some shadow kind of thing, I have called functions to turn
off shadows
as well as backface culling as off. But still shadow kind of effect remains
and the Poly data is sometimes dark due to this.

Thanks
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