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PhysicalMaterial Crash when reading the name


I have a .fbx road, which have materials different for each part of the road. I want to know the hit material name when using a line trace.

So I have this code:

 this->GetWorld()->LineTraceSingleByObjectType(OutHit, VFStart_LR, VFLeft,FCollisionObjectQueryParams(FCollisionObjectQueryParams::AllObjects),CollisionParams);
    UPhysicalMaterial* mat = OutHit.PhysMaterial.Get();
    // Crash here...
    FString str = mat->GetName();
    UE_LOG(LogTemp, Log, TEXT("Hit Mat Name: %s"),*str);

The error message is:

 CommonLinuxCrashHandler: Signal=11
 [2018.05.15-13.37.47:132][110]LogLinux: === Critical error: ===
 Unhandled Exception: SIGSEGV: invalid attempt to read memory at address 0x0000000000000000

So I think there is no name for the physMaterial, but there are namesalt text

So how can I get the correct material names?

Thanks a lot! :)


Product Version: UE 4.19
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asked May 15 '18 at 01:43 PM in C++ Programming

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avatar image Lunarix_ May 15 '18 at 01:47 PM

Okay - so I can validate it with: if(OutHit.PhysMaterial.IsValid())

But then I still do not get these names. How to get them from a FHitResult?

So I can get the name with: OutHit.GetComponent()->GetMaterial(X)->GetFName().ToString()

but how to get the current X that is hit?

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