MergePointAttributesSubset ( const FPCGPoint& InPointA, const UPCGMetadata* InMetadata..., const UPCGMetadata* InMetadata..., const FPCGPoint& InPointB, const UPCGMetadata* InMetadata..., const UPCGMetadata* InMetadata..., FPCGPoint& OutPoint, EPCGMetadataOp Op )