The red surface in the picture above was offset to the green surface with the solid option. It had a hole, so I then manually extended and re-trimmed it to create another shell.
But then I offset the green surface (that now has oversized surfaces) and the same hole appears!
offset-solid-hole.3dm (1.3 MB)
Both the green polysurface and its offset are bad objectsā¦
Ok, I wish Rhino could automatically put a Dot with an exclamation mark in it on every ābadā surface on importā¦ (or actually do something about it)ā¦
But even so, the extracted ābadā surfaces arenāt where the offset fails.
Also, when I āfixedā the green surface, the result is actually worse:
offset-solid-hole2.3dm (1.2 MB)
What would it take to properly repair something like this to make it offset, I wonder?
Well, your object is kind of a mess. Probably because the original input curves were messy. There are lots of multiknot surfaces and joints which are slightly out of tangency.
I exploded the red object, used RemoveMultiKnot as a first step to remove some of the messiness. I then tried eliminating some of the small segments and lining some stuff up better, and I had to rebuild one surface which I was not able to fix otherwise. Finally I got a good offset. However, I would suggest you start over with clean curves and make clean surfaces.
OffsetMess.3dm (3.5 MB)
Thank you for the information, you didnāt have to do the actual workaround but itās interesting to hear that you have to go through the same steps I do. I have many of these kinds of objects, so I canāt take time to rebuild them all, I just need to get the job done quickly.
RemoveMultiKnot was new to meā¦ before reading the documentation I wondered why this isnāt done automatically on import, but it says itās sometimes desired, but if a surface is linear within one U/V direction I see no reason for them to be retained if they cause trouble.
I guess Rebuild removes them anyway, and thatās often what I resort to doing.
Wish there was an easier way to re-trim things as wellā¦ lots and lots of time is wasted with trimming in Rhino because itās so many clicks and so many small operations involved.
Hi Robert -
It sounds like you are running into this quite a bit.
Please run the -CheckNewObjects command and make sure that this is set to Check=Yes.
-wim
Also, .01 document tolerance is a bit fat - at this scale and level of detail, I would work with .001 units from the beginning.
-Pascal
