How to instantiate Physical Material and assign it to Sphere Component programmatically in C++?

Development Programming & Scripting C++
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1

I did the following:

ADodgeballProjectile::ADodgeballProjectile()
{
    PrimaryActorTick.bCanEverTick = true;
    SphereComponent = CreateDefaultSubobject<USphereComponent>(TEXT("Sphere Component"));
    // others have been removed for the sake of simplicity!
    SetRootComponent(SphereComponent);

    UPhysicalMaterial* PhysicalMaterial = CreateDefaultSubobject<UPhysicalMaterial>(TEXT("Physical Material"));
    PhysicalMaterial->Friction = 0.1f;
    PhysicalMaterial->Restitution = 0.5f;
    SphereComponent->BodyInstance.SetPhysMaterialOverride(PhysicalMaterial);

}

and I got 3 errors as follows:

Error    LNK2019    unresolved external symbol "__declspec(dllimport) private: static class UClass * __cdecl UPhysicalMaterial::GetPrivateStaticClass(void)" (__imp_?GetPrivateStaticClass@UPhysicalMaterial@@CAPEAVUClass@@XZ) referenced in function "public: __cdecl ADodgeballProjectile::ADodgeballProjectile(void)" (??0ADodgeballProjectile@@QEAA@XZ)    Dodgeball    C:\Users\amd\Documents\Unreal Projects\Books\Dodgeball\Intermediate\ProjectFiles\DodgeballProjectile.cpp.obj    1    

Error    LNK1120    1 unresolved externals    Dodgeball    C:\Users\amd\Documents\Unreal Projects\Books\Dodgeball\Binaries\Win64\UE4Editor-Dodgeball-0019.dll    1    

Error    MSB3073    The command ""C:\Program Files\Epic Games\UE_4.27\Engine\Build\BatchFiles\Build.bat" DodgeballEditor Win64 Development -Project="C:\Users\amd\Documents\Unreal Projects\Books\Dodgeball\Dodgeball.uproject" -WaitMutex -FromMsBuild" exited with code 6.    Dodgeball    C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Microsoft\VC\v170\Microsoft.MakeFile.Targets    44
2

Go to %YourProjectName%.Build.cs and add "PhysicsCore" to the list of Dependency Modules.
See if it helps.

2 Likes
3

Great! It works. Thank you!

4

Any time you see “unresolved externals”, just go see if the new class you’re trying to use requires a dependency module. You can find it in the UE documentation. For instance, here’s the page for UPhysicalMaterial; Under References, it shows the module you need to add.

1 Like