Errors loading USDZ file with Isaac sim 4.5

Omniverse Isaac Sim
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1

Hi,
I am loading some usdz file previously works ominverse and isaac-sim 4.0 using latest version isaac-sim 4.5, but it report errors and finally display everything in blue.
I then manually unzip usdz into a folder and load the extracted files using Isaac-sim 4.5 and it works.
I also load usdz file in isaac-sim 4.0 and save to another usdz file, then load the usdz file saved by isaac-sim 4.0 using isaac-sim 4.5, it also reports errors and display everything in blue.
Is it a regression in 4.5? thanks! See error message below:

[20.405s] Isaac Sim Full App is loaded.
2025-04-29 21:04:26 [32,778ms] [Warning] [gpu.foundation.plugin] Failed to get file information for caching asset with error 0 modtime 0 hash ‘’.
2025-04-29 21:04:26 [32,778ms] [Warning] [gpu.foundation.plugin] Disabling caching and streaming of file:/C:/usd/Objects/AcidReducer_DNEG.usdz%5BTextures/BaseColor.png%5D
2025-04-29 21:04:26 [32,781ms] [Error] [gpu.foundation.plugin] Couldn’t process file:/C:/Objects/AcidReducer_DNEG.usdz%5BTextures/BaseColor.png%5D, it might not have written completely. Reason: createimage: Invalid image format extension: .png]

Isaac Sim Version

4.5.0

Operating System

Linux
Windows 11

GPU Information

  • Model:
  • Driver Version:

Topic Description

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2

Are you seeing this problem only with specific USDZ files? If so, could you share one or more of the affected USDZ files?

3

you can just open the example asset comes with isaac-sim4.5, isaac sim asset: small_warehouse_digital_twin.usd, Then export it to small_warehouse_digital_twin.usdz, then open small_warehouse_digital_twin.usdz, then you have the bug.

4

ping, thanks.

6

Could you share the details on how you save to a USDZ file? On my end, I only see options for *.usd, *.usdc, and *.usda.

7

i could be wrong, but i am pretty sure the OP was using File > Export to get the .USDZ format.

i’ve ran into this issue in the past and haven’t used it as of late. it’s when reopening the USDZ, the subUSDs assets (.MDLs and texture assets) are unlinked. i used to swap the broken links out manually to locally sourced duplicates to workaround it but perhaps you can provide some insights 🤞

9

We are able to reproduce the issue. We will provide an update as soon as there is any progress. Thanks.

10

This issue has been fixed. Please verify it using the Isaac Sim 5.0 preview, which is available on GitHub at https://github.com/isaac-sim/IsaacSim.