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CellGrid: Fix backface lighting issue

Jaswant Panchumarti (Kitware) requested to merge jaswant.panchumarti/vtk:fix-cellgrid-back-face-rendering into master

For backfaces, the sign of normal's z-component needs to be flipped prior to light calculations, otherwise, it uses the front-face's normal and renders a black face.

backport: paraview/release

Edited by Jaswant Panchumarti (Kitware)

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