Thank you.
Yes, "-1" indicates depth.
I see, the approach to research using sensors is very nice.
To be honest, I was a little tired, so I asked.
If you come in contact with other issues, you'll want to be prepared to explore the issue and investigate for debugging.
Maybe I shouldn't talk about it here, but regarding depth--2. -3 was so easy to feel that only -1 was difficult. This may be due to my design. (It was a battle build considering offense and defense.)
I will report uniformly.