Among the 6 parameters in OnComponentBeginOverlap, what does OtherBodyIndex mean?

Development Programming & Scripting C++
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1 
void AMyClass::OnCompBeginOverlap(
    UPrimitiveComponent* OverlappedComponent,
    AActor* OtherActor,
    UPrimitiveComponent* OtherComp,
    int32 OtherBodyIndex,
    bool bFromSweep,
    const FHitResult& SweepResult)
{
    // ....
}

What does int32 OtherBodyIndex mean?

2

In skinned mesh components (skeletal mesh component is derived from this component) they are used to get the bone name.

Look for this code in CharacterMovementComponent.cpp:11150

		FName BoneName = NAME_None;
		if (OtherBodyIndex != INDEX_NONE)
		{
			BoneName = ((USkinnedMeshComponent*)OtherComp)->GetBoneName(OtherBodyIndex);
		}

If the OtherComp is a USkinnedMeshComponent the body index refers to the bone index.

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