Hi, according to the docs, Brep.Trim(Brep, Double) should remove parts that are in normal direction of the cutter. However, if used with a flipped Brep as cutter, the opposite part is removed. Example: TrimBrep.py (1008 Bytes) IMHO this is either a bug or should be clearly stated in the docs. Wo…

Hi Hanno, I’m not very familiar with python, yet: Reading the file, could it be that the second time you are trimming with the initial brep2 and not with the filled version? When calling doc.Objects.Add(brep2) don’t you need to collect the newly added geometry ID? -Willem

Hi Willem, thanks for your suggestions, but in this case I am directly working with RhinoCommon objects and only add the results (and the flipped brep2) to the document to be able to see what I’m working with. That’s why I don’t collect the new GUID. And Brep.Flip() works in place, that’s why I am…

OK, it was a shot in the dark as I’m only familiar with RhinoScript.

Looks a little suspicious to me. Let me take a look under the hood…

It appears that the function is looking at the surface normal instead of the direction of the face, which can be different. I’ve got this in the to-do list for a future service release.

Hi there, I know it’s been more than three years of this post but I’ve found the same problem in the latest installation of RhinoCommon although in my case I’m creating the plugin running under a VB project. Does any body know if this was solved? Regards

Hi Dale, The link you’ve sent is from 2014, and I’ve installed RhinoCommon two and half months ago, so… I don’t think I’m running an old version. In any case, How do I check it?

Brep.Trim with flipped Brep as cutter

Rhino Developer

dale (Dale Fugier) November 28, 2016, 4:30pm 10

Hi Yopi,

I believe the above mentioned fix was made in the Rhino WIP. Have you tried it?

Welcome to Serengeti

– Dale

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Brep.Trim with flipped Brep as cutter

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