Curve display is 1px off

[Charles]

This is a perfectly flat curve:

From e.g. Top view, I shouldn’t see the extra pixel.
2024-08-07_FlatCurve.3dm (35.3 KB)

---

Rhino 8 SR10 2024-8-6 (Rhino 8, 8.10.24219.11001, Git hash:master @ b88a537a9dda5345a3c2bb4bd2ad0c2cd14cb138)
License type: Commercial, Build 2024-08-06
License details: Cloud Zoo

Windows 11 (10.0.22631 SR0.0) or greater (Physical RAM: 32GB)
.NET 7.0.20

Computer platform: DESKTOP

Standard graphics configuration.
Primary display and OpenGL: NVIDIA GeForce RTX 2070 (NVidia) Memory: 8GB, Driver date: 4-11-2024 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 552.22
> 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
Redraw scene when viewports are exposed: On
Graphics level being used: OpenGL 4.6 (primary GPU’s maximum)

Anti-alias mode: 4x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: High

Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 4-11-2024
Driver Version: 31.0.15.5222
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 8 GB

Rhino plugins that do not ship with Rhino
C:\Program Files\SimLab\Plugins\SimLab 3D PDF From Rhino 6\plugins\SimLabPDFExporter.rhp “SimLab PDF Exporter”
C:\Program Files\Common Files\McNeel\Rhinoceros\7.0\Plug-ins\XNurbs (80be33b0-13b2-4ac4-9c77-03829214f9e9)\6.0.0.0\XNurbsRhino7.rhp “XNurbs”

Rhino plugins that ship with Rhino
C:\Program Files\Rhino 8\Plug-ins\Commands.rhp “Commands” 8.10.24219.11001
C:\Program Files\Rhino 8\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 8\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 8.10.24219.11001
C:\Program Files\Rhino 8\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 8.10.24219.11001
C:\Users\Charles\AppData\Roaming\McNeel\Rhinoceros\packages\8.0\PanelingTools\2021.3.2.446\PanelingTools.rhp “PanelingTools”
C:\Program Files\Rhino 8\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 8\Plug-ins\MeshCommands.rhp “MeshCommands” 8.10.24219.11001
C:\Program Files\Rhino 8\Plug-ins\RhinoCycles.rhp “RhinoCycles” 8.10.24219.11001
C:\Program Files\Rhino 8\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 8.10.24219.11001
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”

---

Same with

Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 7-30-2024
Driver Version: 32.0.15.6081
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 8 GB

[jeremy5 (Jeremy)]

Hi Charles,

Opening your file in the same release of Rhino I don’t see that here. Do you have any non-default settings for the wireframe display mode?

Regards
Jeremy

[Charles]

No, all is default.
TestWireThicknessScale = 1 = default as well

The extra pixel is seen in Shaded too.

Windows is at 100%.

[Gijs (Gijs de Zwart)]

I think I am seeing something similar, though to me it appears that the curve seen from top is less wide/thick, this is with curve thickness 2:

However when setting curves to pixels instead (2) it is aligned correctly:

I think it is a side effect of RH-53520 Line not visible head-on

RH-83246 Line head on is rendered on a different spot