URDF to USD import failure: Used null prim

Omniverse Isaac Sim
1

Hello,

I tried to import a URDF file using this guide: Importing a New Asset — Isaac Lab documentation
But received the following error:

 <class 'RuntimeError'> Used null prim

The urdf was taken from here: LEAP_Hand_Sim/assets/leap_hand at master · leap-hand/LEAP_Hand_Sim · GitHub
Attaching the full trace:
import-error.txt (1.9 KB)

Could you please assist in investigating this error?
Thanks

2

Hello,
did you find a solution to your issue?
I am having the same error on an official urdf that i try to convert…

3

Any solutions @yuval.sasson @JeanLesur ?

4

Just wanted to share an update in case it’s helpful to others — it turns out there seems to be a bug in the URDF importer.

What worked for me was converting the original URDF to MJCF and then converting it back to URDF. After doing this, the import into Isaac Lab worked without triggering the error.

1 Like
5

@yuval.sasson that’s good to know, thanks for sharing!

6

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