IsaacSim get stuck when begin to simulate

[sfireworks]

I have a complex USD files with lots of things inside, and set some of them with rigid body and collision. When I load the usd file, the terminal log shows lots of warnings as shown below:

After loading the scene, i clike the play button and the Isaacsim program get stucked, last log shows in the terminal is below:

2024-11-20 06:24:27 [340,816ms] [Warning] [carb.ujitsoagent.plugin] UJITSOAgent : node () hit hash collision. Data: MetaData different at pos: 48. Difference in metadata, this indicates that the meta data generation is non-deterministicor some option / input wasn’t included correctly in gatherDependencies.
2024-11-20 06:24:27 [340,816ms] [Warning] [carb.ujitsoagent.plugin] Difference in metaData
2024-11-20 06:24:28 [341,467ms] [Warning] [omni.physx.cooking.plugin] ConvexDecompositionCookingTask: adjusted the thickness of a very thin or very small mesh such that it meets the requirements for a GPU compatible convex hull collider. Prim
2024-11-20 06:24:28 [341,539ms] [Warning] [omni.physx.cooking.plugin] ConvexDecompositionCookingTask: adjusted the thickness of a very thin or very small mesh such that it meets the requirements for a GPU compatible convex hull collider. Prim
2024-11-20 06:32:53 [846,711ms] [Warning] [carb.ujitsoagent.plugin] UJITSO : Build storage validation failed for Storage status: 01
2024-11-20 06:32:53 [846,711ms] [Error] [omni.physx.cooking.plugin] m_processResult == OperationResult::SUCCESS is false.

I tried the Isaacsim 4.0.0, 4.1.0 and 4.2.0, all these three versions shows the same error and get stuck. Dose anyone knows how to fix this?

Isaac Sim Version

4.2.0
4.1.0
4.0.0
2023.1.1
2023.1.0-hotfix.1
Other (please specify):

Isaac Lab Version (if applicable)

1.2
1.1
1.0
Other (please specify):

Operating System

Ubuntu 22.04
Ubuntu 20.04
Windows 11
Windows 10
Other (please specify):

GPU Information

• Model:
• Driver Version:

Topic Description

Detailed Description

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[scristiano]

@sfireworks can you try disabling the UJITSO cooking system before clicking the play button?
Please refer to these posts:

Start simulation error

Can you provide more details? Ideally the entire stage /asset if it can be shared. Looking at the errors displayed you could try to disable the UJITSO cooking system, close and restart the application and try again. The setting is at: Edit → Preferences → Physics → Local Mesh Cache → Enable Ujitso Collision cooking [image]

GPU Memory Usage

@flexivuser Yes that’s expected, as Ujitso Cooking is not a persistent setting, it will not get persisted in the json settings file and it will be reset to its default value at every reboot. You can manually disable it after booting the application or try passing the -/physics/cooking/ujitsoCollisionCooking=false as command line option.

[sfireworks]

ok it works, there are no more error messages and the simluation wont get stuck any more.
By the way, how does disabling ujitsoCollisionCooking impact the simulation process? will the simalation process gets slow or something?

[scristiano]

The ujitsoCollisionCooking is a new caching system for physics colliders and it will not impact simulation process.

We’ve been finding some stability issues on this new physics colliders cooking system that have been fixed in upcoming releases, so we suggest to try using it again after updating.