Hi McNeel
I can’t say if it’s always been like this, or if something has changed, but…
In the attached file there are 3 cylinders: first is open, second has a revolved cap, third is capped using Cap.
If I sub-object select the edge of the cylinder(s) using ctrl+shift, initiate extrude via the gumball and then - as the extrusion is underway - hold down shift to extrude both ways - only the open cylinder and the revolved cap results in an extrusion that goes both ways. The capped cylinder shows the corect preview, but the resulting geometry is only extruded in one direction. Bug or is there a reason for this?
gumball extrude bug.3dm (118.8 KB)
System Info
Rhino 8 SR29 2026-2-10 (Rhino 8, 8.29.26041.19001, Git hash:master @ 80d77ae009ea63d1508535f3c0798937283f5e68)
License type: Commercial, build 2026-02-10
License details: Cloud Zoo
Windows 11 (10.0.26200 SR0.0) or greater (Physical RAM: 95GB)
.NET 8.0.14
Computer platform: DESKTOP
Standard graphics configuration.
Primary display and OpenGL: NVIDIA Quadro RTX 4000 (NVidia) Memory: 8GB, Driver date: 1-26-2025 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 572.16
> Accelerated graphics device with 4 adapter port(s)
- Windows Main Display attached to adapter port #0
- Secondary monitor attached to adapter port #1
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: 4x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: High
Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 1-26-2025
Driver Version: 32.0.15.7216
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:\ProgramData\McNeel\Rhinoceros\8.0\Plug-ins\Datasmith Rhino Exporter (d1fdc795-b334-4933-b680-088119cdc6bb)\DatasmithRhino8.rhp “Datasmith Exporter” 5.6.1.0
C:\Users\jn\AppData\Roaming\McNeel\Rhinoceros\packages\8.0\RhinoBanana\0.1.9\RhinoBanana.rhp “RhinoBanana” 0.1.9.0
Rhino plugins that ship with Rhino
C:\Program Files\Rhino 8\Plug-ins\Commands.rhp “Commands” 8.29.26041.19001
C:\Users\jn\AppData\Roaming\McNeel\Rhinoceros\packages\8.0\PanelingTools\2024.8.20.677\PanelingTools.rhp “PanelingTools”
C:\Program Files\Rhino 8\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 8\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 8.29.26041.19001
C:\Program Files\Rhino 8\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 8.29.26041.19001
C:\Program Files\Rhino 8\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 8\Plug-ins\MeshCommands.rhp “MeshCommands” 8.29.26041.19001
C:\Program Files\Rhino 8\Plug-ins\IronPython\RhinoDLR_Python.rhp “IronPython” 8.29.26041.19001
C:\Program Files\Rhino 8\Plug-ins\RhinoCycles.rhp “RhinoCycles” 8.29.26041.19001
C:\Program Files\Rhino 8\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 8.29.26041.19001
C:\Program Files\Rhino 8\Plug-ins\Displacement.rhp “Displacement”
TIA, Jakob