Rhino Materials Keep Disappearing – Even in Main File

[dongju.han]

Hi,
I’m an architecture student currently using Rhino 8 Educational Version and D5 Render Educational Version, both updated to their latest versions

I’ve been experiencing a recurring issue where materials I assign in Rhino keep disappearing after re-opening the file or reconnecting with D5 Render. Initially, I suspected that the issue was related to Rhino’s Worksession function, since the materials assigned to referenced (attached) models were resetting to the default material. However, I later realized that even the materials assigned in the original Rhino model file itself are being lost and assigned as default material of Rhino modeling, regardless of whether Worksession is used or not.

This problem occurs particularly after I:

Reconnect Live Sync between Rhino and D5
Make changes to layers in Rhino (especially turning them on/off)
Occasionally just reopen the D5 project file

However, it’s important to note that the materials don’t always reset immediately after these actions. Sometimes, everything seems fine—until I do something unrelated, like rendering a single still image, and suddenly all the materials are gone. So although I listed those actions above, I have to admit I don’t fully understand the exact trigger behind the material reset. It’s unpredictable and frustrating.

It’s become extremely tiring and time-consuming to constantly reapply all the materials, especially in a large architectural scene with many unique surfaces and settings.

One suspicion I have is whether the problem could be related to the file name or Windows user name being written in Korean characters. I wonder if non-English characters are interfering with how D5 handles material assignments or file paths.

I would really appreciate it if the development team could:

Confirm whether this issue is known
Let me know if there’s a recommended workflow or a workaround to preserve materials reliably
Clarify if Korean file/user names may cause data loss

Thank you for your help and support. I’m relying on D5 for important presentation work, and I’d love to keep using it without these issues.

[Clov]

Hi @dongju.han

I apologize for the inconvenience. A korean file name should not be causing any problems, I doubt this is the root cause of this.

Anyway, please check the following:

• Are you perhaps using a Cloud Storage to store these files? (One Drive, Google Drive, etc.) If so, please download them locally first before working on it.
• Does this occur to objects that are not part of the layer that was hidden?

[dongju.han]

Hi, thank you for your reply.

1. No, I am not using any cloud storage. All files are stored and opened directly from my local hard drive.
2. Yes, the material reset also happens to objects that are not part of hidden layers. Even objects from layers that remain visible sometimes lose their materials after actions like rendering, reconnecting Live Sync, or other situations that I may not be fully aware of.

Please let me know if there’s any other information I can provide. Thank you again for your support.

[Clov]

Hi there

Alright, basically all of these files were stored in either C or D folders, and the material still resets.

• Can you please check the settings where these files were stored? You should have full permission in the folder’s properties.
  
  
• Are there any extra process on your end specifically with Rhino that you did?
• Have you perhaps tried testing it on a simple file?