# Mesh edges visible through a thin object - how to remove?

**URL:** https://discourse.vtk.org/t/mesh-edges-visible-through-a-thin-object-how-to-remove/6208
**Category:** Support
**Created:** [July 19, 2021, 11:26pm UTC](https://discourse.vtk.org/t/mesh-edges-visible-through-a-thin-object-how-to-remove/6208 "2021-07-19T23:26:40Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![michaelhogg](https://discourse.vtk.org/user_avatar/discourse.vtk.org/michaelhogg/32/4613_2.png) [@michaelhogg](https://discourse.vtk.org/u/michaelhogg)
#### Post date: [July 19, 2021, 11:26pm UTC](https://discourse.vtk.org/t/mesh-edges-visible-through-a-thin-object-how-to-remove/6208/1 "2021-07-19T23:26:40Z")

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Hi all,

I have a polydata object that is thin in some regions. When I show edges, the edges on the back side of the object are visible. You can see this in the attached image. This does not happen in Paraview, so I assume there is a renderer setting that will fix this.

I have tried using `renderer.SetUseHiddenLineRemoval(True)` and `renderer.ResetCameraClippingRange()` but no luck there.

Any suggestions on how to fix this?

Note: I am using VTK 9.0.1 in Python.

Cheers,  
Michael

 ![image](https://discourse.vtk.org/uploads/default/original/2X/d/d7f22971b3f339e43e62ea371cf392261a0a683e.png)

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### Author: ![Aron\_Helser](https://discourse.vtk.org/user_avatar/discourse.vtk.org/aron_helser/32/14_2.png) [@Aron\_Helser](https://discourse.vtk.org/u/Aron_Helser)
#### Post date: [July 20, 2021, 1:52pm UTC](https://discourse.vtk.org/t/mesh-edges-visible-through-a-thin-object-how-to-remove/6208/2 "2021-07-20T13:52:56Z")

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I believe this is due to coincident topology resolution. In C++  
`vtkMapper::SetResolveCoincidentTopologyToOff();` will disable it. However, some of your edges may then disappear. You can counteract this with

`myActor->GetProperty()->SetRenderLinesAsTubes(1);`

You can also adjust the coincident topology settings to match your data better, instead.  
HTH,  
Aron

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### Author: ![michaelhogg](https://discourse.vtk.org/user_avatar/discourse.vtk.org/michaelhogg/32/4613_2.png) [@michaelhogg](https://discourse.vtk.org/u/michaelhogg)
#### Post date: [July 23, 2021, 6:47am UTC](https://discourse.vtk.org/t/mesh-edges-visible-through-a-thin-object-how-to-remove/6208/3 "2021-07-23T06:47:02Z")

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Hi Aron,

I tried your suggestion, but unfortunately this did not help. I tried a few of the other mapper coincident topology settings, but nothing seemed to make any difference. Any other suggestions?

Cheers,  
Michael