Hit Events header file

/*Static Mesh Component*/
UPROPERTY(VisibleAnywhere)
UStaticMeshComponent* SM;

/*OnHit functions is called when the FallingActor hits something - PRE 4.12 version */
UFUNCTION()
void OnHit(AActor* OtherActor, UPrimitiveComponent* OtherComp, FVector NormalImpulse, const FHitResult& Hit);

/*OnHit function is called when the FallingActor hits something - 4.12+ version */
UFUNCTION()
void OnHit(UPrimitiveComponent* HitComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, FVector NormalImpulse, const FHitResult& Hit);

/*ReceiveHit functions is called when the FallingActor gets hit by something */
UFUNCTION()
void ReceiveHit(UPrimitiveComponent* MyComp, AActor* OtherActor, UPrimitiveComponent* OtherComp, FVector NormalImpulse, const FHitResult& Hit);