Selecting Edges on box


I cannot figure out how to select the edges of an object. I tried using the shift ctrl left-click but it only selects faces. Does anyone have any ideas of what I am doing wrong?

Thanks in advance

The SelectionFilter command opens the Selection Filter controls. The Selection Filter restricts any selection mode to specified object types.

To select sub-object parts with a mouse press and hold Ctrl + Shift and left mouse click, window, or crossing. ReadMore…

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You should be able to do that… how was the box made?

Also, maybe it would be useful to run SystemInfo in Rhino and copy/paste the results here.

Thanks guys,

I think I figured out that I can select the edges on closed extrusions, but not closed poly-surfaces. I’m assuming this means that if I want to morph an object using its edges in the future, that I will have to extrude 2D geometry.

Or if you have any other suggestions on how to do this, please let me know. Also, attached is the copy and paste of Systeminfo if you have any comments to make on whether this may be the cause of the problems.

Thank You

Rhino 6 SR27 2020-6-24 (Rhino 6, 6.27.20176.05001, Git hash:master @ ba2c30de00be5a8b210bc297715204e941911799)
License type: Educational, build 2020-06-24
License details: Stand-Alone

Windows 10.0 SR0.0 or greater (Physical RAM: 12Gb)
Machine name: DESKTOP-5ML505A

Hybrid graphics system.
Primary display: Intel® UHD Graphics 630 (Intel) Memory: 1GB, Driver date: 9-25-2019 (M-D-Y).
Primary OpenGL: NVIDIA GeForce GTX 1050 Ti (NVidia) Memory: 4GB, Driver date: 8-24-2019 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 436.15

OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
Redraw scene when viewports are exposed: On

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

Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 8-24-2019
Driver Version:
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 4 GB

Rhino plugins
C:\Program Files\Rhino 6\Plug-ins\SolidTools.rhp “SolidTools”
C:\Program Files\Rhino 6\Plug-ins\Commands.rhp “Commands” 6.27.20176.5001
C:\Program Files\Rhino 6\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 6\Plug-ins\RhinoBonusTools.rhp “Rhino Bonus Tools”
C:\Users\Brendan\AppData\Roaming\McNeel\Rhinoceros\6.0\Plug-ins\Fologram for Rhino (468a328b-20d9-494b-b9e1-cbe9f827d3a2)\2020.2.1.2\6\Fologram.IO.Rhino3d.Win.rhp “Fologram for Rhino” 2020.2.1.2
C:\Program Files\Rhino 6\Plug-ins\RhinoRender.rhp “Rhino Render”
C:\Program Files\Rhino 6\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 6.27.20176.5001
C:\Program Files\Rhino 6\Plug-ins\rdk_ui.rhp “Renderer Development Kit UI”
C:\Program Files\Rhino 6\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 6\Plug-ins\IronPython\RhinoDLR_Python.rhp “IronPython” 6.27.20176.5001
C:\Program Files\Rhino 6\Plug-ins\RhinoCycles.rhp “RhinoCycles” 6.27.20176.5001
C:\Program Files\Rhino 6\Plug-ins\Grasshopper\GrasshopperPlugin.rhp “Grasshopper” 6.27.20176.5001
C:\Program Files\Rhino 6\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 6.27.20176.5001
C:\Program Files\Rhino 6\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Rhino 6\Plug-ins\Displacement.rhp “Displacement”


I realize that when I morph an edge of a closed extrusion that it becomes a closed solid polysurface. Would you guys know how for it to maintain its properties as a closed extrusion after morphing?


Not sure what you are referring to by ‘morph’… If you are talking about something like using Flow, FlowAlongSurface, CageEdit or something similar on an extrusion, then yes, it will become a polysurface. Also simply modifying an edge will do it.

An extrusion is defined by a profile curve extruded along a straight axis. As soon as you modify the result, even by trimming it or punching a hole in it somewhere, it can no longer be defined that way, hence it reverts to being a surface or polysurface.


Thank you!