[vtkusers] The cross/coplane issue when draw polyline with mesh surface.

[qinyang_1980]

Hello All, 

I'm a fresh member of vtk users. 

I meet an strange issue when draw polyline over the mesh surface. 

The polyline will be blocked somewhere by the mesh surface because they are
coplanar. 
Please see the picture below: 

<http://vtk.1045678.n5.nabble.com/file/n5731146/Untitled.png> 

But if I open this file by using ParaView, it do not have this cross issue. 
But it will have some shift effect. Please see the below picture : 

<http://vtk.1045678.n5.nabble.com/file/n5731146/Untitled2.png> 

Somebody can tell me how to resovle this cross issue ? 
My target is let the user see the polyline and mesh both clearly. 

Thanks. 



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