# Contouring qualities are different on same data with inverse sign
**URL:** https://discourse.paraview.org/t/contouring-qualities-are-different-on-same-data-with-inverse-sign/13104
**Category:** ParaView Support
**Created:** [October 26, 2023, 3:26am UTC](https://discourse.paraview.org/t/contouring-qualities-are-different-on-same-data-with-inverse-sign/13104 "2023-10-26T03:26:13Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@fashing](https://discourse.paraview.org/u/fashing)
#### Post date: [October 26, 2023, 3:26am UTC](https://discourse.paraview.org/t/contouring-qualities-are-different-on-same-data-with-inverse-sign/13104/1 "2023-10-26T03:26:13Z")
Hi ParaView,
I am tracking my previous issue [Error in clip closed surface filter over contour filter (#22308) · Issues · ParaView / ParaView · GitLab (kitware.com)](https://gitlab.kitware.com/paraview/paraview/-/issues/22308). And I found if I inverse the sign symbol, the ClipClosedSurface works as expected. Thanks!
However, I found the image quality drops when I do so. Here’s the testcase I used ([testClipClose.vdb](https://discourse.paraview.org/uploads/short-url/nPWuJ5tditJ56TEWQA7b89E4x5x.vdb)). The first grid contains singed distance with negative as inside, the second grid is the first grid multiplied by -1.
And I found the second grid (the white one) got a more zigzag edge.
Is there anything I can adjust to avoid this? Thank you!
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### Author:  [@fashing](https://discourse.paraview.org/u/fashing)
#### Post date: [October 26, 2023, 3:54am UTC](https://discourse.paraview.org/t/contouring-qualities-are-different-on-same-data-with-inverse-sign/13104/2 "2023-10-26T03:54:16Z")
Interestingly, when I use `IsoVolume` filter with (min, max) = (-0.01, 0.01), the condition flips. The second one (the white one) becomes smoother and the first one gets the zigzag edge.
