[vtkusers] planar object is very dark when camera is perpendicular to its normal.

[zlf]

Thank you. It works.
I meet another problem now. The wireframe is bright when camera targets its
front face. But it is dark when camera targets its back face.

http://vtk.1045678.n5.nabble.com/file/n5133227/l1.jpg 
http://vtk.1045678.n5.nabble.com/file/n5133227/l2.jpg 

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