MDL Material Loading Error in h1_social_navigation.py Execution

[c99z]

Hello, I encountered an issue while running h1_social_navigation.py in my environment. The script fails to load MDL materials, causing rendering errors. Below is the error log I received:

2025-03-04 06:00:19 [12,074,489ms] [Error] [omni.usd] USD_MDL: in LoadModule at line 247 of ../../source/plugins/usdMdl/neuray.cpp -- 'rtx::neuraylib::MdlModuleId' for '/home/dell/GRUtopia/grutopia/assets/OpenRobotLab___GRScenes/scenes/GRScenes-100/home_scenes/scenes/MV7J6NIKTKJZ2AABAAAAADY8_usd/models/object/articulated/electriccooker/441837a19229a98d827c1df74b3f0207/Materials/MI_6577347511bd150001eb1e49.mdl' is Invalid

2025-03-04 06:00:19 [12,074,490ms] [Error] [omni.usd] USD_MDL: in GetSdrFromDiscoveryResult at line 178 of ../../source/plugins/usdMdl/moduleRegistry.cpp -- Module: '/home/dell/GRUtopia/grutopia/assets/OpenRobotLab___GRScenes/scenes/GRScenes-100/home_scenes/scenes/MV7J6NIKTKJZ2AABAAAAADY8_usd/models/object/articulated/electriccooker/441837a19229a98d827c1df74b3f0207/Materials/MI_6577347511bd150001eb1e49.mdl' with version '1' not found in 'MdlModuleRegistry::ModuleDataMap'.

2025-03-04 06:00:20 [12,074,569ms] [Warning] [rtx.neuraylib.plugin] Loading MdlModule to DB (rtx_scope0) failed: ::Z73file_3A::home::dell::GRUtopia::grutopia::assets::OpenRobotLab___GRScenes::scenes::Z60GRScenes_2D100::home_scenes::scenes::MV7J6NIKTKJZ2AABAAAAADY8_usd::models::object::articulated::electriccooker::Z99_3441837a19229a98d827c1df74b3f0207::Materials::MI_6577347511bd150001eb1e49
2025-03-04 06:00:20 [12,074,569ms] [Warning] [rtx.neuraylib.plugin] Loading transaction committed (this thread). MdlModule is NOT in the DB (rtx_scope0): ::Z73file_3A::home::dell::GRUtopia::grutopia::assets::OpenRobotLab___GRScenes::scenes::Z60GRScenes_2D100::home_scenes::scenes::MV7J6NIKTKJZ2AABAAAAADY8_usd::models::object::articulated::electriccooker::Z99_3441837a19229a98d827c1df74b3f0207::Materials::MI_6577347511bd150001eb1e49
2025-03-04 06:00:20 [12,074,569ms] [Error] [omni.hydra] Failed to create MDL shade node for prim '/World/env_0/scene/Meshes/Animation/electriccooker/model_441837a19229a98d827c1df74b3f0207_0/Looks/MI_6577347511bd150001eb1e49/Shader'. createMdlModule failed.

The above error appears many times, and it seems that many MDL materials failed to load.

• Operating System: (Ubuntu 22.04)
• Isaac sim Version: (4.2.0)
• NVIDIA GPU Model (Nvidia Quadro RTX 6000)
  The program seems to run normally, but it takes a long time.
  How can I solve this problem?

[tianshihan818]

@c99z Hi! Did you configure the environment variable MDL_SYSTEM_PATH? I think the value in your case is /home/dell/GRUtopia/grutopia/assets/OpenRobotLab___GRScenes/scenes/GRScenes-100/home_scenes/Materials.

[c99z]

@c99z Hi! Did you configure the environment variable MDL_SYSTEM_PATH? I think the value in your case is /home/dell/GRUtopia/grutopia/assets/OpenRobotLab___GRScenes/scenes/GRScenes-100/home_scenes/Materials.

Thank you for your reply, I've fixed this issue but another problem has arisen：

2025-03-04 08:11:24 [637,207ms] [Error] [omni.usd] USD_MDL: in GetSdrFromDiscoveryResult at line 178 of ../../source/plugins/usdMdl/moduleRegistry.cpp -- Module: '/home/dell/GRUtopia/grutopia/assets/OpenRobotLab___GRScenes/scenes/GRScenes-100/home_scenes/scenes/MV7J6NIKTKJZ2AABAAAAADY8_usd/Materials/DayMaterial.mdl' with version '1' not found in 'MdlModuleRegistry::ModuleDataMap'.

It's about DayMaterial.mdl
I've noticed that a similar issue has been raised, but I'm not sure if the bug has been fixed and that the solution to that problem doesn't apply directly to my problem。How can I fix it? Thank you very much!

[MiangChen]

I meet the same problem.
I have configurated the MDL_SYSTEM_PATH:

and I run the command:
python toolkits/grscenes_scripts/play_scene.py -f /home/ubuntu/PycharmProjects/GRUtopia/grutopia/assets//scenes/GRScenes-100/home_scenes/scenes/MV7J6NIKTKJZ2AABAAAAADA8_usd/start_result_interaction.usd

the problem occurs:

2025-03-09 14:12:59 [7,150ms] [Error] [omni.usd] USD_MDL: in LoadModule at line 247 of ../../source/plugins/usdMdl/neuray.cpp -- 'rtx::neuraylib::MdlModuleId' for 'Materials/DayMaterial.mdl' is Invalid

2025-03-09 14:12:59 [7,150ms] [Error] [omni.usd] USD_MDL: in GetSdrFromDiscoveryResult at line 178 of ../../source/plugins/usdMdl/moduleRegistry.cpp -- Module: 'Materials/DayMaterial.mdl' with version '1' not found in 'MdlModuleRegistry::ModuleDataMap'.

2025-03-09 14:12:59 [7,150ms] [Error] [omni.hydra] Failed to create MDL shade node for prim '/Root/Looks/DayMaterial/DayMaterial'. Empty identifier: ''         and/or subIdentifier: ''