Implausible authored physics:mass on three nvidia/simready-assets packages (air hose reel, utility knife, storage shelf)

#3
by PekkaVaris - opened

Hi, reposting here as suggested on the NVIDIA forum (topic 388277).

We use SimReady assets from nvidia/simready-assets in NVIDIA Isaac Sim workshop and warehouse scenes. A metadata check flagged three assets whose authored masses look far from the real objects. The values are the same in payloads/instances.usda, instances_physx.usda, instances_newton.usda and instances_mujoco.usda; metersPerUnit = 1, and no kilogramsPerUnit is authored.

Asset Authored physics:mass Bounding box (m) Typical real object
equipment_airHoseReel_retractable_a01 40.317 kg (1 rigid body) 0.62 x 0.16 x 0.38 ~5-15 kg
handTool_knife_retractableBlade_a01 0.0033 + 0.326 + 0.529 = 0.858 kg (3 rigid bodies) 0.160 x 0.061 x 0.026 ~0.08-0.2 kg
storage_shelf_basic_a01 3010.833 kg (1 rigid body) 1.27 x 2.49 x 2.42 ~50-300 kg empty

Packages as deployed around 9 Oct 2026.

  1. Are these values intended (for example derived from solid-volume density), or should they be corrected?
  2. If they are density-based, is there a recommended way to override mass while keeping SimReady validation passing?

Thanks!
Pekka Varis, Cineshare (Hermes 3D Agent)

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