🐛 BUG - Creating Rhino Material With Name Referenced In GH Freezes

[michaelvollrath]

Hi @kike and @andyopayne,

I trigged a “freeze” or rather VERY slow behavior I am calling a freeze.

To repeat:
-Cache a larger number of geometry objects such as 1,400
-Have the Model Object node use a referenced Model Material for it’s Render Material
-Ensure this is in a blank document where this material does not yet exist in Rhino
-Leave the Grasshopper script running and attempt, in Rhino, to create a new material that matches this Query Model Material name input.
-Rhino/GH will slow to the point of freezing and a green loading bar appears under the Content Cache component and sloooowly progresses.

Some imagery below:

Grasshopper, note that “Satin Copper” is referenced as the Name input for Query Model Material but does not exist in the Rhino Document yet.

30 min later:

Script solver is active.

Created a new material of type “Metal” and named to “Satin Copper”, note that the screen snip here is what Rhino is frozen on after committing the name change to Satin Copper:

Grasshopper/Rhino freezes, green loading bar shows up under Cache component and it does progress but a bout 1% a minute and RAM usage of Rhino jumps to 54% in task manager.

System Info

Rhino 8 SR19 2025-4-22 (Rhino 8, 8.19.25112.13001, Git hash:master @ 0fe5f551e3e34ca51834ba0ca2217647d8027942)
License type: Commercial, build 2025-04-22
License details: Cloud Zoo

Windows 11 (10.0.26100 SR0.0) or greater (Physical RAM: 64GB)
.NET 7.0.20

Computer platform: LAPTOP - Plugged in [98% battery remaining]

Standard graphics configuration.
Primary display: DisplayLink USB Device (DisplayLink) Memory: 0MB, Driver date: 12-18-2024 (M-D-Y).
> External USB display device with 4 adapter port(s)
- Windows Main Display attached to adapter port 0
Primary OpenGL: NVIDIA GeForce RTX 3080 Ti Laptop GPU (NVidia) Memory: 16GB, Driver date: 11-6-2024 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 566.14
> Integrated accelerated graphics device with 4 adapter port(s)
- Video pass-through to primary display device

Secondary graphics devices.
Intel(R) Iris(R) Xe Graphics (Intel) Memory: 1GB, Driver date: 10-26-2022 (M-D-Y).
> Integrated graphics device with 4 adapter port(s)
- There are no monitors attached to this device. Laptop lid is probably closed
DisplayLink USB Device (DisplayLink) Memory: 0MB, Driver date: 12-18-2024 (M-D-Y).
> External USB display device with 0 adapter port(s)
- There are no monitors attached to this device. Laptop lid is probably closed

OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
GPU Tessellation is: On
Redraw scene when viewports are exposed: Off
Graphics level being used: OpenGL 4.6 (primary GPU’s maximum)

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: 11-6-2024
Driver Version: 32.0.15.6614
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 16 GB

Rhino plugins that do not ship with Rhino
C:\ProgramData\McNeel\Rhinoceros\7.0\Plug-ins\Datasmith Rhino Exporter (d1fdc795-b334-4933-b680-088119cdc6bb)\DatasmithRhino7.rhp “Datasmith Exporter” 5.1.0.0
C:\Program Files\Enscape\Enscape.Rhino.Plugin-net48\Enscape.Rhino8.Plugin.dll “Enscape.Rhino8.Plugin” 4.2.1.88
C:\Users\micha\AppData\Roaming\McNeel\Rhinoceros\packages\8.0\Crash\1.4.2-beta\Crash.rhp “Crash” 1.4.0.0
C:\Users\micha\AppData\Roaming\McNeel\Rhinoceros\8.0\Plug-ins\D5LiveSync (e0d5e210-02f6-4ee9-a2b0-1675e225d958)\D5Conv.rhp “D5 Live Sync for Rhino”

Rhino plugins that ship with Rhino
C:\Program Files\Rhino 8\Plug-ins\Commands.rhp “Commands” 8.19.25112.13001
C:\Program Files\Rhino 8\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 8\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 8.19.25112.13001
C:\Program Files\Rhino 8\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 8.19.25112.13001
C:\Program Files\Rhino 8\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 8\Plug-ins\MeshCommands.rhp “MeshCommands” 8.19.25112.13001
C:\Program Files\Rhino 8\Plug-ins\IronPython\RhinoDLR_Python.rhp “IronPython” 8.19.25112.13001
C:\Program Files\Rhino 8\Plug-ins\RhinoCycles.rhp “RhinoCycles” 8.19.25112.13001
C:\Program Files\Rhino 8\Plug-ins\Grasshopper\GrasshopperPlugin.rhp “Grasshopper” 8.19.25112.13001
C:\Program Files\Rhino 8\Plug-ins\RhinoCode\RhinoCodePlugin.rhp “RhinoCodePlugin” 8.19.25112.13001
C:\Program Files\Rhino 8\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 8.19.25112.13001
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”

Thank you all!

[Japhy]

Hi Michael,

I wasn’t able to repeat with the instructions provided in 8.20.25112.06001.

Can you try again with my file but starting Rhino in Safe Mode?
R8-Material-Rename-Test.gh (14.9 KB)

[michaelvollrath]

Thanks @Japhy,

If you could send me a 8.20 build I’ll gladly test on that.

I was able to reproduce the issue with the script you shared in my 8.19 build.

Here’s a video of it happening:

Thanks for your help!

[Japhy]

Sending.

I’m at around 3 seconds. I would be interested in seeing if there is any differences without 3rd party plugins running.

[Japhy]

Increasing the amount of objects does seem to affect the time exponentially. Doubling to 3000 goes to 14 seconds.., still waiting on the 6000 object try.

[michaelvollrath]

@Japhy

Doubling to 3000 goes to 14 seconds.., still waiting on the 6000 object try.

This makes sense based on what I am seeing on my end for the slowness as well. Thanks for testing

[kike (Kike Garcia)]

This is fixed on 8.20.

Now 10.000 items are pushed in ~1.6s.

[michaelvollrath]

@kike

Now 10.000 items are pushed in ~1.6s.

thank you sir!