iMac freezes completely after using Rhino3d for Mac for more than one hour

It seems that my iMac (21inch, late 2015, macOS Catalina v10.15.4) will freeze completely after I use Rhino3d v6 for Mac for more than one hour.

This has happened for more than one time, and I don’t want to open Rhino any more.

Has anybody else experienced similar OS freezing issue?

Can the Rhino development team advise how to solve this problem if it has been reported by other users, too?


can you post your system info:

Thanks, @KeithR .

My system info is shown below with personal info replaced by ######

Rhino 6 SR25 2020-4-23 (Public Build, 6.25.20114.03572, Git hash:master @ f35d7ded15ec317635ced435d8df84327397038d)
License type: Educational Lab License, build 2020-04-23
License details: Cloud Zoo. In use by: ######

Apple Intel 64-bit macOS Version 10.15.4 (Build 19E287) (Physical RAM: 16Gb)
Mac Model Identifier: iMac16,2
Machine name: ######
Language: en-GB (MacOS default)

Intel® Iris™ Pro Graphics 6200 (OpenGL ver:4.1 INTEL-14.5.22)

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: Intel Inc.
Render version: 4.1
Shading Language: 4.10
Maximum Texture size: 16384 x 16384
Z-Buffer depth: n/a
Maximum Viewport size: 16384 x 16384
Total Video Memory: 1536 MB
Graphics: Intel Iris Pro Graphics 6200
Displays: iMac (217dpi 2x)

Graphics processors
Intel Iris Pro Graphics 6200 (1536 MB)
iMac (2048 x 1152)

USB devices
Broadcom Corp.: Bluetooth USB Host Controller
Apple Inc.: FaceTime HD Camera (Built-in)
Apple Inc.: Apple Keyboard

Bluetooth devices
Broadcom: Magic Mouse 2
Apple: Apple Wireless Trackpad

Third party kernel extensions
com.paragon-software.filesystems.ntfs (62.5.15) 9B7B3A35-65B9-34FA-A8A7-DF08CE50FB36

Third party plugins

Rhino plugins
/Applications/ “PanelingTools” 6.25.20114.1002
/Applications/ “Grasshopper” 6.25.20114.3572
/Applications/ “AnimationTools” 6.25.20114.1002
/Applications/ “IronPython” 6.25.20114.3572
/Applications/ “Commands” 6.25.20114.3572
/Applications/ “Snapshots” 6.25.20114.1002
/Applications/ “RDK_EtoUI” 6.25.20114.3572
/Applications/ “Displacement” 6.25.20114.1002
/Applications/ “Renderer Development Kit” 6.25.20114.1002
/Applications/ “Rhino Render” 6.25.20114.1002
/Applications/ “RhinoCycles” 6.25.20114.3572


No idea.
Hopefully someone else will have an idea.

I do know we are seeing issues with the older Intel 6000, and 6100 under powered graphics chips. I have not heard specifically if this is a problem with the 6200s or not.
It just means it’s not a good graphics chip choice for running Rhino.

Thank you, @John_Brock and @KeithR.

No worry. For the time being I’ll use Rhino on a different computer until I can get an iMac with better graphic card.