The box was created using the Box command. Started in front view and placed to opposite corners of the first face on the Cplane, then switched to top or right view to pull out the volume. I’ve made several volumes that way over the last several days which have had the same problem.
I exploded the selection box and rejoined it, and the results are the same.
Created a bounding box around the box I created. Results are the same.
I had forgotten SelBox. I tried it and the results were the same.
I created points on ends of the curves should have been selected but were not, and then checked the coordinates of those points using List. The y coordinate of the those curve end points are negative by order of E-16 or E-17, so basic double precision floating point round off error.
Absolute tolerance is 0.001 which is what I use almost always, and has not been changed since the geometry was initially created.
Rhino 7 SR5 2021-4-10 (Rhino 7, 7.5.21100.03001, Git hash:master @ 2cd158094b595f6400479d7cbe511454b6149527)
License type: Commercial, build 2021-04-10
License details: Cloud Zoo
Windows 10.0.19042 SR0.0 or greater (Physical RAM: 16Gb)
Computer platform: DESKTOP
Standard graphics configuration.
Primary display and OpenGL: NVIDIA GeForce RTX 2080 Ti (NVidia) Memory: 11GB, Driver date: 4-8-2021 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 462.31
> Accelerated graphics device with 4 adapter port(s)
- Windows Main Display attached to adapter port #0
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: High
Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 4-8-2021
Driver Version: 18.104.22.16831
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
Rhino plugins that ship with Rhino
C:\Program Files\Rhino 7\Plug-ins\Commands.rhp “Commands” 7.5.21100.3001
C:\Program Files\Rhino 7\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 7\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 7.5.21100.3001
C:\Program Files\Rhino 7\Plug-ins\RhinoRender.rhp “Legacy Rhino Render”
C:\Program Files\Rhino 7\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 7.5.21100.3001
C:\Program Files\Rhino 7\Plug-ins\rdk_ui.rhp “Renderer Development Kit UI”
C:\Program Files\Rhino 7\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 7\Plug-ins\RhinoCycles.rhp “RhinoCycles” 7.5.21100.3001
C:\Program Files\Rhino 7\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 7.5.21100.3001
C:\Program Files\Rhino 7\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Rhino 7\Plug-ins\Displacement.rhp “Displacement”