Just to share what seems to be an issue with the Shell command, simplest geometry possible result is open, file attached.
Done in Rhino 8, same result in WIP 9.
Brick Shell.3dm (163.8 KB)
Using Rhino 8, can’t use Rhino 9 for work right now.
Rhino 8 SR34 2026-8-3 (Rhino 8, 8.34.26215.11001, Git hash:master @ 432899356374d85f0034e4d540fd31ebf51882a0)
License type: Commercial, build 2026-08-03
License details: Cloud Zoo
Windows 11 (10.0.26200 SR0.0) or greater (Physical RAM: 32GB)
.NET 8.0.30
Computer platform: LAPTOP - Plugged in [100% battery remaining]
Hybrid graphics configuration.
Primary display: Intel(R) Iris(R) Xe Graphics (Intel) Memory: 2GB, Driver date: 3-3-2026 (M-D-Y).
> Integrated graphics device with 4 adapter port(s)
- Windows Main Display is laptop's integrated screen or built-in port
Primary OpenGL: NVIDIA GeForce RTX 3070 Ti Laptop GPU (NVidia) Memory: 8GB, Driver date: 3-31-2026 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 596.08
> Integrated accelerated graphics device with 4 adapter port(s)
- Video pass-through to primary display device
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: 2x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: High
Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 3-31-2026
Driver Version: 32.0.15.9608
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:\Users\user\AppData\Roaming\McNeel\Rhinoceros\packages\8.0\SubstanceImporter\2.0.7\Substance.Win.rhp "SubstanceImporter" 2.0.7.0
Rhino plugins that ship with Rhino
C:\Program Files\Rhino 8\Plug-ins\Commands.rhp "Commands" 8.34.26215.11001
C:\Program Files\Rhino 8\Plug-ins\WebBrowser.rhp "WebBrowser"
C:\Program Files\Rhino 8\Plug-ins\rdk.rhp "Renderer Development Kit"
C:\Program Files\Rhino 8\Plug-ins\RhinoRenderCycles.rhp "Rhino Render" 8.34.26215.11001
C:\Program Files\Rhino 8\Plug-ins\rdk_etoui.rhp "RDK_EtoUI" 8.34.26215.11001
C:\Program Files\Rhino 8\Plug-ins\NamedSnapshots.rhp "Snapshots"
C:\Program Files\Rhino 8\Plug-ins\MeshCommands.rhp "MeshCommands" 8.34.26215.11001
C:\Program Files\Rhino 8\Plug-ins\RhinoCycles.rhp "RhinoCycles" 8.34.26215.11001
C:\Program Files\Rhino 8\Plug-ins\Toolbars\Toolbars.rhp "Toolbars" 8.34.26215.11001
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"
C:\Program Files\Rhino 8\Plug-ins\SolidTools.rhp "SolidTools"
C:\Program Files\Rhino 8\Plug-ins\RhinoBonusTools.rhp "Rhino Bonus Tools"
C:\Program Files\Rhino 8\Plug-ins\AnimationTools.rhp "AnimationTools"
C:\Program Files\Rhino 8\Plug-ins\export_AI.rhp "Adobe Illustrator Export"
C:\Program Files\Rhino 8\Plug-ins\Calc.rhp "Calc"
C:\Program Files\Rhino 8\Plug-ins\import_IGES.rhp "IGES Import Plug-in"
C:\Program Files\Rhino 8\Plug-ins\Grasshopper\GrasshopperPlugin.rhp "Grasshopper" 8.34.26215.11001
C:\Program Files\Rhino 8\Plug-ins\Import_SolidWorks.rhp "Solidworks Import"
C:\Program Files\Rhino 8\Plug-ins\import_GHS.rhp "General Hydrostatics (GHS) Import"
No problem, thanks Japhy
Hi @diegodx,
From what you’ve posted, I believe you want to undercut the lip. There are several ways to do this, but just to show you can do it with Shell here is:
Starting from the solid brick you Pushpull the inner region of the top down by 0.9 less than the overall height, then use Shell, specifying the four internal walls as the faces to remove. You may need to MergeAllCoplanarFaces on the result and/or delete an unwanted box to tidy up, but you get the undercut and the object is solid.
HTH
Jeremy
A workflow to be remembered in the future
Thanks