Offsetsrf error

hi everyone.
learning Rhino 7 from Youtube tutorial video, I found some problem about _OFFSETSRF, which does not work completely to make solid and it is difference in the number of arrows from the video before being completely done the command. How can I solve this trouble? ㅠ-ㅠ
Paul le quernec.3dm (267.6 KB)

Hello - the object seems to offset OK up to at least 20 units - your image looks like about 50 units offset and indeed that is too far - the radius if curvature on the waves is somewhere around 24 or so units, so you’d need to keep the offset distance below that, is my guess.



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Your kindness make me be passionate to handle Rhino, Thank you very much for your help. :blush: