Issue exporting FMU from Open Modelica OMEdit to Unreal 5.3.2

[sebzuddas]

I managed to install and use the plugin in UE 5.3.2, but currently the FMU's I'm exporting from OMEdit are throwing errors.
I came to understand that there were two types of FMU's, co-simulation and model exchange. Co-simulation exports the solver alongside the model, whereas model exchange relies on the destination software to have its own solver. I'm suspecting this is the issue, however I cannot say for sure.

difference between co-simulation and model exchange

KERNELBASE
VCRUNTIME140
UnrealEditor_UEFMI!fmikit::FMU::error() [C:\dev\digital_twins\latest_engine_test\Plugins\UEFMI\Source\UEFMI\ThirdParty\fmikit\src\FMU.cpp:203]
UnrealEditor_UEFMI!fmikit::FMU::FMU() [C:\dev\digital_twins\latest_engine_test\Plugins\UEFMI\Source\UEFMI\ThirdParty\fmikit\src\FMU.cpp:168]
UnrealEditor_UEFMI!fmikit::FMU2::FMU2() [C:\dev\digital_twins\latest_engine_test\Plugins\UEFMI\Source\UEFMI\ThirdParty\fmikit\src\FMU2.cpp:25]
UnrealEditor_UEFMI!fmikit::FMU2Slave::FMU2Slave() [C:\dev\digital_twins\latest_engine_test\Plugins\UEFMI\Source\UEFMI\ThirdParty\fmikit\src\FMU2.cpp:197]
UnrealEditor_UEFMI!std::make_unique<fmikit::FMU2Slave,char *,char *,char *,char *,0>() [C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\VC\Tools\MSVC\14.39.33519\INCLUDE\memory:3434]
UnrealEditor_UEFMI!AA_FMU::Initialize() [C:\dev\digital_twins\latest_engine_test\Plugins\UEFMI\Source\UEFMI\Private\A_FMU.cpp:113]
UnrealEditor_UEFMI!AA_FMU::BeginPlay() [C:\dev\digital_twins\latest_engine_test\Plugins\UEFMI\Source\UEFMI\Private\A_FMU.cpp:100]
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
kernel32
ntdll

[greenwoodms06]

I can't speak to OMEdits FMUs. The UE plugin is for co-simulation only. If the FMU doesn't work then openmodelica may not be creating a completely FMI compliant FMU ( I have seen that from various FMI tools before). To check, if it works in FMpy (e.g., the gui reference on their github) then it should work using the UE plugin.

[sebzuddas]

Yes seems like an OMEdit problem. When I run using FMpy I get the following error:

Failed to load shared library C:\Users\szuddas\AppData\Local\Temp\tmpwcbim2gy\binaries\win64\unreal_test.dll. Could not find module 'C:\Users\szuddas\AppData\Local\Temp\tmpwcbim2gy\binaries\win64\unreal_test.dll' (or one of its dependencies). Try using the full path with constructor syntax.

Then if I import the FMU that OMEdit exported, I get this problem:

[unreal_fmu: 62:7-62:37]: [Operator reinit may not be used in an algorithm section (use translation flag --allowNonStandardModelica=reinitInAlgorithms to ignore).](omeditmessagesbrowser:///unreal_fmu?lineNumber=62)

Will keep the thread updated if I find a solution.