Path error when having three floors

[ouyangyuyu]

Hello, Dear

This is Oscar Young. At first, thanks very much for the great demo you made. But I have met a problem after I adding a third floor to this demo. It works well from floor1 to floor2, floor 1 to floor3, floor2 to floor3. But when navigating from floor3 to floor2, the result is from floor3 to floor1 at first, and then floor1 to floor 2. It looks quite wired.

Could you please help figure it out? I can send you the files I use by email.

Thanks so much!
Oscar