Here are some troubleshooting steps that you can try to resolve this issue:
- Check that the xml description in the udrf file only contains elements and attributes that are supported. You can see the supported elements and atrributes here. If this model contains any elements or attributes outside of the supported ones, it may not be properly visualized.
- Verify Mesh Files: If the URDF file references external mesh files (e.g., .stl, .dae), make sure these files are available and correctly referenced in the URDF. The paths should be correct relative to the location of the URDF file.