Isaac Sim 5.0.0: App freezes when moving a Deformable "Bag" containing Deformable cables

Omniverse Isaac Sim
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  1. Scene Setup & Workflow

• Version: Isaac Sim 5.0.0 (installed via Isaac Lab)

• Mesh Creation: Created a thin vinyl bag and cables in Blender.

• Export/Import: Exported as USD from Blender (all transforms applied) and imported into Isaac Sim.

• Physics & Materials:

Both the bag and the cables are set as Deformable Bodies.

Assigned Deformable Body properties within Isaac Sim.

Set up textures (color and transparency) for the bag.

• Scenario & Objective: * The deformable cables are placed inside the thin deformable bag.

The ultimate goal is to simulate a robotic arm grasping and lifting the bag filled with cables. I need to reproduce the complex physical interaction where the bag deforms under the weight and movement of the internal cables during the pick-and-place task.

  1. Step-by-Step Description of the Issue

Simulation Play: When I press the “Play” button, the bag falls naturally due to gravity and settles on the ground. This part works correctly.

Interaction (The Problem): As soon as I try to manually drag the bag using the Gizmo (to test the initial state or simulate a grasp), the application freezes immediately.

Observation: This freeze occurs even if I Pause the simulation before attempting to move the object. The UI becomes completely unresponsive, and I have to force-quit the application.

  1. Environment

OS: Windows 11

GPU: RTX 3080 Laptop

Driver: (Details included in the attached log)

  1. Attached Files

Log File: isaacsim_freeze.log

Video: Screen recording of the freeze during interaction.

  1. Specific Questions

Are there known issues or performance bottlenecks when interacting with two overlapping/nested Deformable Bodies (container and content) in version 5.0.0?

Since the freeze occurs even in a Paused state, is it possible that the USD stage update or the proximity of the nested meshes is causing a calculation loop?

Are there any recommended settings (like Contact Offset, Solver Iterations, or Mesh resolution) to mitigate this hang, especially for a robotic grasping scenario involving nested deformables?
isaacsim_freeze.log (1.6 MB)

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Hi @masaya-torigoe,

Thank you for posting this issue. Deformable-deformable interaction should be working so this is not expected behavior. Would you be able to share the USD asset for me to more quickly reproduce this?

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Hi @michalin ,

Thank you for your patience. I have packaged the assets into a single ZIP file to ensure all dependencies are included.

Attachment: Collected_0128Forums.zip

Folder Structure & Contents:

main_scene.usd: This is the primary file where both the bag and cables are set as Deformable Bodies.

Issue: Causes an immediate UI freeze when using the Translate Gizmo or upon physical contact (even when paused).

rigid_cable_scene.usd: This is a workaround version where the cables are treated as Rigid Bodies.

Issue: The UI does not freeze, but the cables penetrate/fall through the deformable bag upon impact.

SubUSDs/: Contains all referenced .usdc models and dependencies collected via the “Flat Collection” tool.

How to Reproduce:

Freeze Issue: Open main_scene.usd, press Play, and attempt to move the “Bag” or “Cable” prims with the Gizmo.

Penetration Issue: Open rigid_cable_scene.usd. The cables are already placed inside the bag. To observe the issue, drop the entire setup (bag with cables inside) from a height. Upon landing, you will see the rigid cables penetrating through the bottom of the deformable bag instead of being contained.

I hope these comparison files help you identify the root cause of the solver instability and the collision failure. Please let me know if you are able to reproduce these issues on your end.

Best regards, Masaya Torigoe

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Following up, note that the minimum hardware req. for Isaac Sim 5.0 is RTX 4080. It is likely you are running out of memory.

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@masaya-torigoe any change you can try with a GPU with more memory? Like @phennings mentioned RTX 4080>? Also, I cannot access the file you have attached can you try to send it again?