I am trying to load a custom URDF into RobotBuilder in UnrealEngine following these directions https://docs.nvidia.com/isaac/isaac_sim/plugins/robot_builder/urdf.html#new-urdf-setup It is not based on any of the example robots.
I have the Isaac sim source from here: https://github.com/NvPhysX/UnrealEngine/tree/IsaacSim_1.2
When I tried it, Unreal crashed. When I debug it, in Robot.cpp at line 1278 the call to importModel returns nullptr. There is nothing in the output to suggest what the problem might be with my URDF. importModel is closed source.
Does anyone have any suggestions on what I can do to debug this?