# Strange visualization issue

**URL:** https://discourse.paraview.org/t/strange-visualization-issue/16430
**Category:** ParaView Support
**Tags:** vtk
**Created:** [April 4, 2025, 1:57pm UTC](https://discourse.paraview.org/t/strange-visualization-issue/16430 "2025-04-04T13:57:28Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Suman\_Vajjala](https://discourse.paraview.org/user_avatar/discourse.paraview.org/suman_vajjala/32/8560_2.png) [@Suman\_Vajjala](https://discourse.paraview.org/u/Suman_Vajjala)
#### Post date: [April 4, 2025, 1:57pm UTC](https://discourse.paraview.org/t/strange-visualization-issue/16430/1 "2025-04-04T13:57:28Z")

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Dear Paraview Team,

I have written a code to output my CFD data to a VTKHDF file. When I zoom and plot I notice strange striations in the visualization. I have not activated any contours but just the solid lines. Why are these appearing?

Regards  
Suman

 ![problem_dfr](https://discourse.paraview.org/uploads/default/original/3X/1/3/1395482ea898bb4e38ff3db66c55fecaa42ee39d.png)

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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: [April 4, 2025, 3:01pm UTC](https://discourse.paraview.org/t/strange-visualization-issue/16430/2 "2025-04-04T15:01:50Z")

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Hi @Suman_Vajjala

Please share your data.

Best,