TraceFinger

float AVRCharacterBase::TraceFingerSegment(EVRHandType HandType, EVRHandFingerType FingerType,
                                           UPrimitiveComponent* GrabComponent)
{
	USceneComponent* HandComponent = HandType == EHT_Left ? L_HandMeshComponent : R_HandMeshComponent;

	TMap<EVRHandFingerType, FVRHandFingerMapEntries> FingersCacheMap = HandType == EHT_Left
		                                                                   ? L_FingersCacheMap
		                                                                   : R_FingersCacheMap;
	FVRHandFingerMapEntries* FingerCacheMap = FingersCacheMap.Find(FingerType);

	if (FingerCacheMap)
	{
		TArray<FVector> ArrayOfFingerPoints = FingerCacheMap->Entries;

		float TotalLength;
		float HitLength;

		bool bIsHit = false;

		FTransform HandTransform = HandComponent->GetComponentTransform();

		for (int Index = 0; Index < ArrayOfFingerPoints.Num() - 1; Index++)
		{
			FVector FingerPointCurrentLocation = UKismetMathLibrary::TransformLocation(HandTransform, ArrayOfFingerPoints[Index]);
			FVector FingerPointNextLocation = UKismetMathLibrary::TransformLocation(
				HandTransform, ArrayOfFingerPoints[Index + 1]);

			if (!bIsHit)
			{
				FHitResult HitResult;
				FCollisionQueryParams CollisionParams;

				CollisionParams.bTraceComplex = true;

				if (GrabComponent->LineTraceComponent(HitResult, FingerPointCurrentLocation, FingerPointNextLocation, CollisionParams))
				{
					bIsHit = true;
					HitLength = TotalLength + HitResult.Distance;
				}
			}

			TotalLength += FVector::Distance(FingerPointCurrentLocation, FingerPointNextLocation);

			if (!bIsHit)
			{
				HitLength = TotalLength;
			}
		}

		float Result = FMath::Clamp(HitLength / TotalLength, 0, 1);

		return Result;
	}

	return 0;
}