ExtendSrf - result is bad object

ExtendSrf this untrimmed, three side surface. Result is a bad object.
ExtendSrfBadObjectDC01.3dm (1.9 MB)

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Rhino 8 SR7 2024-4-10 (Rhino 8, 8.7.24101.10001, Git hash:master @ 2b50f55c58918e10b4e2d13323128fce6021b72c)
License type: Commercial, build 2024-04-10
License details: Cloud Zoo

Windows 11 (10.0.22631 SR0.0) or greater (Physical RAM: 64GB)
.NET Framework 4.8.9232.0

Computer platform: DESKTOP

Standard graphics configuration.
Primary display and OpenGL: NVIDIA GeForce RTX 2080 Ti (NVidia) Memory: 11GB, Driver date: 12-6-2023 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 546.33
> 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: 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: 11 GB

Rhino plugins that do not ship with Rhino
C:\Program Files\Cyberstrak\R8\CS_ModelingPlugIn.rhp “Cyberstrak Modeling PlugIn”

Rhino plugins that ship with Rhino
C:\Program Files\Rhino 8\Plug-ins\SolidTools.rhp “SolidTools”
C:\Program Files\Rhino 8\Plug-ins\Commands.rhp “Commands” 8.7.24101.10001
C:\Program Files\Rhino 8\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 8\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 8.7.24101.10001
C:\Program Files\Rhino 8\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 8.7.24101.10001
C:\Program Files\Rhino 8\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 8\Plug-ins\MeshCommands.rhp “MeshCommands” 8.7.24101.10001
C:\Program Files\Rhino 8\Plug-ins\RhinoCycles.rhp “RhinoCycles” 8.7.24101.10001
C:\Program Files\Rhino 8\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 8.7.24101.10001
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”

Added: I confirmed Cyberstrak is not the cause. I reloaded Rhino without Cyberstrak enabled and the result was the same.

thanks @davidcockey

RH-81507 ExtendSrf results in bad surface

I wasn’t able to get a bad surface using 8.5.24072.13001, 2024-03-12.

There are some changes in the 8.7 branch due to other bugs and this might be a negative side effect of it.

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