# Display strange lines(dashed) when I zoom in

**URL:** <https://discourse.vtk.org/t/display-strange-lines-dashed-when-i-zoom-in/16176>\
**Category:** Development\
**Created:** [December 10, 2025, 3:00am UTC](https://discourse.vtk.org/t/display-strange-lines-dashed-when-i-zoom-in/16176 "2025-12-10T03:00:16Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![cmodel](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/c/7ab992/32.png) [@cmodel](https://discourse.vtk.org/u/cmodel)\
**Post date:** [December 15, 2025, 2:07am UTC](https://discourse.vtk.org/t/display-strange-lines-dashed-when-i-zoom-in/16176/7 "2025-12-15T02:07:56Z")

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> [@Problem with Parallel Projection after upgrading to VTK 9.1.0](https://discourse.vtk.org/t/problem-with-parallel-projection-after-upgrading-to-vtk-9-1-0/11169/21):
>
> Thanks for sharing VTK sample! I can reprod the issue. I believe we can fix it but I may not be able to get to it right now, so I’m documenting my findings to help me later or someone who can dig into it now. I can also reproduce the issue in paraview. There is definitely something off when the camera position gets very close to the geometry in orthographic projection mode. The issue did not appear when I checked the “Disable Lighting” box, which led me to suspect the shader’s normal computatio…

This is what I searched on parallel projection view issue, seems similar with what I met now.

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