# How to remove the boundary between different types of mesh

**URL:** https://discourse.paraview.org/t/how-to-remove-the-boundary-between-different-types-of-mesh/11734
**Category:** ParaView Support
**Created:** [March 28, 2023, 11:39am UTC](https://discourse.paraview.org/t/how-to-remove-the-boundary-between-different-types-of-mesh/11734 "2023-03-28T11:39:57Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![pearlpirate](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/p/a698b9/32.png) [@pearlpirate](https://discourse.paraview.org/u/pearlpirate)
#### Post date: [March 28, 2023, 11:39am UTC](https://discourse.paraview.org/t/how-to-remove-the-boundary-between-different-types-of-mesh/11734/1 "2023-03-28T11:39:57Z")

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Hello there,

I’m currently using paraview to post-processing my data from Fluent. I exported the data in CGNS format. I use a combination of structured and unstructured mesh which are connected by an interface. When I do the post-processing, the interface becomes a surface, also when I draw the iso-surface, there is a black boundary line between the unstructured and structured region. It really looks ugly. So I am wondering if anyone knows how to remove this black line and kindly help me. Thank you very much.

Regards,  
Ben

 ![black_line](https://discourse.paraview.org/uploads/default/original/2X/e/ea90d89ee5759cf4d55bd1f966f7a4eae2460980.jpeg)

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### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [March 28, 2023, 11:42am UTC](https://discourse.paraview.org/t/how-to-remove-the-boundary-between-different-types-of-mesh/11734/2 "2023-03-28T11:42:26Z")

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@Charles_Gueunet