[Question] What is "m_processResult == OperationResult" log?

[CAI23sbP]

Question

1. What is this log?

2025-08-11 11:29:45 [38,397ms] [Warning] [omni.physx.cooking.plugin] m_processResult == OperationResult::SUCCESS && "result parameter" is false.
2025-08-11 11:29:45 [38,397ms] [Warning] [omni.physx.cooking.plugin] UjitsoMeshCookingContext: cooking failure
2025-08-11 11:29:45 [38,408ms] [Warning] [omni.physx.plugin] Unable to create triangle mesh for:/World/ground/terrain/mesh

2. How to setting a "m_process"?

p..s. Definitely i want to use horizontal scale = 0.05 not default scale 0.1

[RandomOakForest]

Thank you for posting this. PhysX uses a “cooking” step to preprocess meshes for collision (triangle or convex). When the cooking task reports “m_processResult == OperationResult::SUCCESS && 'result parameter' is false,” it usually means the pipeline ran but the produced data was invalid or rejected (e.g., non-manifold/degenerate geometry, extreme aspect ratios, scale/precision issues, or memory/resource limits), so the engine cannot instantiate the triangle mesh collider. This is why the next line says “Unable to create triangle mesh for:/World/ground/terrain/mesh.”¹

Several scene conditions can trigger mesh cooking failures, including very thin/small triangles, extremely large meshes, or memory pressure during cooking, especially for complex terrains or high-resolution trimeshes. These errors together with other cooking warnings for thin or small meshes and, in heavy scenes, can even stall the sim. Reducing mesh complexity or adjusting geometry to meet PhysX collider requirements avoids the failure.¹

Isaac Lab config examples (documented API):

• Using TerrainGenerator with a height-field:
  • Set TerrainGeneratorCfg.horizontal_scale = 0.05 to apply to all sub-terrains.²
  • Sub-terrains that inherit HfTerrainBaseCfg also expose horizontal_scale; if set there, it applies at the sub-terrain level.²

Footnotes

1. https://forums.developer.nvidia.com/t/isaacsim-get-stuck-when-begin-to-simulate/314540 ↩ ↩²

2. https://isaac-sim.github.io/IsaacLab/main/source/api/lab/isaaclab.terrains.html ↩ ↩²

[CAI23sbP]

@RandomOakForest Thank you for your reply. By the way, i already setting a ujitsoCollisionCooking as false
Unfortunately, when i have generated num_col = 40, num_row = 10, and horizontal scale = 0.05, then a robot didn't collision with terrain mesh.
You can see this issue under video.

Screencast.from.2025.08.13.00.24.00.webm

When i have decreased (num_col = 20, num_row =10, and horizontal scale = 0.05) or (num_col = 40, num_row =10, and horizontal scale = 0.08), then the robot did collision with terrain mesh.

Screencast.from.2025.08.13.00.25.54.webm

Is there any helpful solutions?

[RandomOakForest]

Following up, that's interesting. I'll move this post to our Discussions for further follow up.