This occurs in V5 - V7.11:
Directly deleting entire rows of control points from a non-rational surface converts it to rational even though _List reports all weights as 1.
Yeah, I’ve encountered this before, from a different cause though - I can’t remember the reason, I asked at the time but… let me ask again…
RH-66021 Removing surface control points makes it rational
-Pascal
https://mcneel.myjetbrains.com/youtrack/issue/RH-61777 was about _RemoveKnot creating rational curves, but not surfaces. Directly deleting control points makes surfaces rational, but not curves.
I’m seeing this in Rhino 7
Crystal Vape - Rational Srf.3dm (5.9 MB)
System Info
Rhino 7 SR37 2024-1-4 (Rhino 7, 7.37.24004.15001, Git hash:master @ e428f0ecb09d755f844c48e5098aba5f8baf55fa)
License type: Educational, build 2024-01-04
License details: Cloud Zoo
Windows 11 (10.0.22621 SR0.0) or greater (Physical RAM: 16Gb)
Computer platform: LAPTOP - Plugged in [100% battery remaining]
Hybrid graphics configuration.
Primary display: Intel(R) UHD Graphics (Intel) Memory: 1GB, Driver date: 7-8-2020 (M-D-Y).
> Integrated graphics device with 3 adapter port(s)
- Windows Main Display is laptop’s integrated screen or built-in port
Primary OpenGL: NVIDIA GeForce RTX 3070 Laptop GPU (NVidia) Memory: 8GB, Driver date: 12-6-2023 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 546.33
> Integrated accelerated graphics device with 4 adapter port(s)
- Secondary monitor is laptop’s integrated screen or built-in port
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: 8x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: High
Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 12-6-2023
Driver Version: 31.0.15.4633
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\Cyberstrak\R7\CS_ModelingPlugIn.rhp “Cyberstrak Modeling PlugIn”
C:\Users\Anto\AppData\Roaming\McNeel\Rhinoceros\packages\7.0\Global-Edge-Continuity\0.9.9.6\GEC.rhp “Global-Edge-Continuity” 0.9.9.6
C:\Users\Anto\OneDrive - University of the Arts London\Learning\3D\Rhino\Program Files\ExtendSurfaceEdge.rhp “ExtendSurfaceEdge” 1.0.0.0
C:\Users\Anto\AppData\Roaming\McNeel\Rhinoceros\7.0\Plug-ins\Bella (813de3fb-18eb-405f-bfcd-b0b4d3da91fb)\23.6.0.0\bella_rhino.rhp “Bella” 23.6.0.0
C:\Users\Anto\AppData\Roaming\McNeel\Rhinoceros\packages\7.0\CommandTracker\7.0.8201.28462\CommandTracker.rhp “CommandTracker” 7.0.8201.28462
C:\Users\Anto\AppData\Roaming\McNeel\Rhinoceros\7.0\Plug-ins\KeyShot12RhinoPlugin (78243fe3-17a0-4865-b713-88b4c224c48c)\1.3.0.0\KeyShot2023RhinoPlugin\Rhino 7\KeyShot2023RhinoPlugin.rhp “KeyShot12RhinoPlugin” 1.0.0.0
C:\Users\Anto\OneDrive - University of the Arts London\Learning\3D\Rhino\Program Files\bin\SetTargetToCursor.rhp “SetTargetToCursor” 0.1.8800.1714
C:\Users\Anto\AppData\Roaming\McNeel\Rhinoceros\packages\7.0\DiscordPresence\1.0.0.2\DiscordPresence.rhp “DiscordPresence” 1.0.0.0
Rhino plugins that ship with Rhino
C:\Program Files\Rhino 7\Plug-ins\SolidTools.rhp “SolidTools”
C:\Program Files\Rhino 7\Plug-ins\Commands.rhp “Commands” 7.37.24004.15001
C:\Program Files\Rhino 7\Plug-ins\WebBrowser.rhp “WebBrowser”
C:\Program Files\Rhino 7\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 7\Plug-ins\RhinoScript.rhp “RhinoScript”
C:\Program Files\Rhino 7\Plug-ins\IdleProcessor.rhp “IdleProcessor”
C:\Program Files\Rhino 7\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 7.37.24004.15001
C:\Program Files\Rhino 7\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 7.37.24004.15001
C:\Program Files\Rhino 7\Plug-ins\rdk_ui.rhp “Renderer Development Kit UI”
C:\Users\Anto\AppData\Roaming\McNeel\Rhinoceros\packages\7.0\PanelingTools\2021.3.2.446\PanelingTools.rhp “PanelingTools”
C:\Program Files\Rhino 7\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 7\Plug-ins\Alerter.rhp “Alerter”
C:\Program Files\Rhino 7\Plug-ins\IronPython\RhinoDLR_Python.rhp “IronPython” 7.37.24004.15001
C:\Program Files\Rhino 7\Plug-ins\RhinoCycles.rhp “RhinoCycles” 7.37.24004.15001
C:\Program Files\Rhino 7\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 7.37.24004.15001
C:\Program Files\Rhino 7\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Rhino 7\Plug-ins\Displacement.rhp “Displacement”
C:\Program Files\Rhino 7\Plug-ins\Calc.rhp “Calc”
Hello- this was fixed in 8.
-Pascal