Hi! I recently updated to Rhino 6 and there seems to be a weird bug with the dimension tool. It just stops working randomly. The _Dim command (or_DimAligned or _DimRotated) shows up in the command line, but nothing happens and I can’t draw dimensions. I have to close and reopen the file to get it to work again. Also, when I go to print my layout, there’s a random dimension line that runs across the drawing that I can’t find in the model or on the layout to delete. It only shows up when I print. Please let me know if there’s a fix!
Best,
Lia
Hi Lia - can you please run the SystemInfo command in Rhino and post the results?
-Pascal
Hi Pascal,
Below are the results. Thanks!
-Lia
Rhino 6 SR15 2019-6-13 (Rhino 6, 6.15.19164.21011, Git hash:master @ e41c99d36bb5000377057645e96b3ea6facf6171)
License type: Commercial, build 2019-06-13
License details: Cloud Zoo. In use by: Lia Burton ()
Windows 10.0 SR0.0 or greater (Physical RAM: 7.9Gb)
Machine name: DESKTOP-OAQCB7M
Non-hybrid graphics.
Primary display and OpenGL: NVIDIA Quadro P620 (NVidia) Memory: 2GB, Driver date: 3-22-2018 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 391.33
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: 3-22-2018
Driver Version: 23.21.13.9133
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 2 GB
Rhino plugins
C:\Program Files\Rhino 6\Plug-ins\Commands.rhp “Commands” 6.15.19164.21011
C:\Program Files\Rhino 6\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 6\Plug-ins\RPC.rhp “RPC”
C:\Program Files\Rhino 6\Plug-ins\RhinoBonusTools.rhp “Rhino Bonus Tools”
C:\Program Files\Rhino 6\Plug-ins\AnimationTools.rhp “AnimationTools”
C:\Program Files\Rhino 6\Plug-ins\RhinoRender.rhp “Rhino Render”
C:\Program Files\Rhino 6\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 6.15.19164.21011
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\RhinoCycles.rhp “RhinoCycles” 6.15.19164.21011
C:\Program Files\Rhino 6\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 6.15.19164.21011
C:\Program Files\Rhino 6\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Rhino 6\Plug-ins\BlockEdit.rhp “BlockEdit” 6.15.19164.21011
C:\Program Files\Rhino 6\Plug-ins\Displacement.rhp “Displacement”
First step would be to update your Nvidia driver. Yours is over a year old, which is about 10 in driver-years. 
Here’s where to get a new one:
Hi Lia - updating the video drivers is a good idea, but this does not strike me as a video related problem, off hand… does this happen in any file or just some files? Can you run a different command and then come back to the dim ones and does that still fail. And, does re-opening the file sort it out, or are you restarting Rhino?
-Pascal
Hi Pascal,
The dimension command problem is happening on multiple files (I’m working on three files at the moment). I only have to reopen the files to get it to work again though, I don’t have to restart Rhino. The mysterious long dimension lines that only show up on prints and pdfs but not in the model or on the layout is only happening in one file but this problem just started today, so I’m not sure if it could start happening in the other files too.
-Lia
Hi Lia-
This seems more likely to be a video related thing, to me - I’d go ahead and update the video drivers and maybe that will sort it all out.
Panels menu > Notifications > Double-click on the notification about the driver and follow along to get the driver - download and install…
-Pascal
Another question…
How many monitors are you running?
You only have 2GB VRAM. That was okay for V5 but not n early enough for V6.
As a rule of thumb, you want 4 GB VRAM per standard resolution monitor, or 8 GB VRAM per high resolution monitor just to support this much higher specifications for Rhino V6 display.
Thank you all so much for the help! I updated the video drivers yesterday afternoon and the dimension tool hasn’t randomly stopped working yet, so that’s a good sign. The mysterious extra lines are still there and I still can’t find the origin, but I’ll keep poking around. I’m only running one monitor on this job. In the past I have used two but that was with Rhino 5. I have the extra memory but have not installed it yet. I will try to do that soon. Thanks for the tips about ideal VRAM to monitors ratio!