Mesh problem or viewport bug? Help

Rendering
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1

Hello, I’m almost always dealing with these bugs on my viewports.

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I don’t know if this is normal, but when I zoom into a mesh, it displays lines that weren’t supposed to be shown. Everyone has to deal with it or it’s just me? How to fix it? Its anoying and I always thing that it’s a bad mash or something.

Here’s the sample file:
MeshBug.3dm (4.7 MB)

Here’s my system info:
Rhino 8 SR21 2025-7-7 (Rhino 8, 8.21.25188.17001, Git hash:master @ 2e05bb7e11ec03aa58cc543d92330d59df05d32b)
License type: Educational, build 2025-07-07
License details: Cloud Zoo

Windows 11 (10.0.26100 SR0.0) or greater (Physical RAM: 64GB)
.NET 8.0.14

Computer platform: DESKTOP

Standard graphics configuration.
Primary display and OpenGL: NVIDIA GeForce RTX 5070 Ti (NVidia) Memory: 16GB, Driver date: 6-24-2025 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 576.88
> Accelerated graphics device with 4 adapter port(s)
- Windows Main Display attached to adapter port 0

OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
GPU Tessellation is: On
Redraw scene when viewports are exposed: On
Graphics level being used: OpenGL 4.6 (primary GPU’s maximum)

Anti-alias mode: 8x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: High

Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 6-24-2025
Driver Version: 32.0.15.7688
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 16303 MB

Rhino plugins that do not ship with Rhino
C:\ProgramData\McNeel\Rhinoceros\8.0\Plug-ins\Datasmith Rhino Exporter (d1fdc795-b334-4933-b680-088119cdc6bb)\DatasmithRhino8.rhp “Datasmith Exporter” 5.5.4.0
C:\Users\Administrador\AppData\Roaming\McNeel\Rhinoceros\8.0\Plug-ins\D5LiveSync (e0d5e210-02f6-4ee9-a2b0-1675e225d958)\D5Conv.rhp “D5 Live Sync for Rhino”

Rhino plugins that ship with Rhino
C:\Program Files\Rhino 8\Plug-ins\Commands.rhp “Commands” 8.21.25188.17001
C:\Program Files\Rhino 8\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 8\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 8.21.25188.17001
C:\Program Files\Rhino 8\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 8.21.25188.17001
C:\Program Files\Rhino 8\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 8\Plug-ins\MeshCommands.rhp “MeshCommands” 8.21.25188.17001
C:\Program Files\Rhino 8\Plug-ins\RhinoCycles.rhp “RhinoCycles” 8.21.25188.17001
C:\Program Files\Rhino 8\Plug-ins\RhinoCode\RhinoCodePlugin.rhp “RhinoCodePlugin” 8.21.25188.17001
C:\Program Files\Rhino 8\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 8.21.25188.17001
C:\Program Files\Rhino 8\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Rhino 8\Plug-ins\Displacement.rhp “Displacement”
C:\Program Files\Rhino 8\Plug-ins\SectionTools.rhp “SectionTools”

2

Here’s a video for better understanding:

EDIT:
Notice that if I isolate the mesh the problem doesn’t affect it anymore, but when I show everything again it returns

3

It’s coming from the skylight lighting. Of course Rendered view is NOT raytraced, so the skylight lighting is just an “effect” that prioritizes speed over anything. Adjusting the rendered mode shadow settings didn’t seem to do much for me, lowering the skylight shadow quality actually sorta helped a bit.

4

Sad but that’s better to hear than that all my meshes are bad
Hope they fix it soon. On Sketchup I never saw this with ambient occlusion, so I think it’s possible to solve.