[vtkusers] A problem with rendering lines on a surface

[pnt1614]

Let's me describe my situation, first I pick many points and then render all
cell edges around those points in different color. Everything is okay but
when I rotate the camera, there are some edges disappeared. I am not sure
what the problem is but it looks like a z-fighting problem. I have attached
two images to show this problem.
<http://vtk.1045678.n5.nabble.com/file/t342361/Image1.jpg> 
<http://vtk.1045678.n5.nabble.com/file/t342361/Image2.jpg> 



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