An offset surface problem

Rhino Rhino for Windows
1

Hi! There was a problem when I want to offset that surface outward into a solid (Picture 1), but the outcome was just something like curve (Picture 2).

Picture 1
Picture 11920×1080 124 KB

P2
P21920×1080 117 KB

What the really strange thing is there is no problem when I offset this surface inward (Picture 3).

p3
p31920×1080 146 KB

And here is the rhino file.
Exercise 2.3dm (433.8 KB)

I would more than appreciate if you can provide any idea of solution.

3

Hello- I see that, thanks.
RH-82502 OffsetSrf failure

Probably the cleanest way out for now is

  1. Explode

  2. OffsetSrf >Solid=No, Loose=Yes
    image

  3. ExtendSrf
    image

  4. Trim and Join
    image

-Pascal

4

It’s work! Thank you so much!

5

Good idea! Thank you very much, Pascal!

6

Note if you lower the tolerance, the result has edge and/or vertex tolerances larger than the document tolerance, which can lead to problems later.

-Pascal

7

Oh, I see…Thanks for you reminding me of it!