There are too many arrows

when I command _offsetSrf in SubD, why my Rhinoceros are too many arrows?

I do artist store.3dm (617.2 KB)

Hi -

I’m not sure if you are comparing this with something else where there are less arrows on the same object? You might want to use the OffsetSubD command here, instead of OffsetSrf.

You are entirely right in the opinion I was comparing by Rhinoceros modeling tutorial, and actually in video, he did using _offsetSubD. I feel that I was not focused in that time I was watching the video. Thank to your help, I can find my fault.