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

[zlf]

Hi all,
I found planar object is very dark when camera is perpendicular to its
normal. e.g: disk, plane

Anyway way to add a bright thick edge to them?

http://vtk.1045678.n5.nabble.com/file/n5130712/dark.jpg 

Thanks

Jerry

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