Brep to Mesh: via Rhino vs via GH

Grasshopper
,
1

Hi all. Every once in a while I find myself scratching my head over meshing breps for 3D printing.

The input breps are clean solids, while ‘Mesh’ command in Rhino consistently return closed, detailed mesh as expected, I couldn’t find its GH equivalent. ‘Mesh Brep’ in GH often returns me open meshes, no matter how I play with the detailed control.

RH meshing vs GH meshing.gh (1.3 MB)

The breps in questions are internalized, so are the good meshes from running Rhino’s ‘Mesh’ command for reference.

I am open to any method as long as it consistently returns solid mesh on reasonably simple breps like those in the attachment.

Thank you.

2

Indeed the Brep Mesh component returns bad mesh.
I also tried Triremesh. Also unclosed and very heavy.
I think this topic is worth getting more attention.

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3

if you have access to the WIP your new best friend is ShrinkWrap!!
I have to reinstall it but, will get back to you in 30min.

UPDATE:
well, your brep had some tiny surface that caused all of this trouble:

tinySurface
tinySurface2074×1164 139 KB

however, I didn’t bother fixing it, but used ShrinkWrap from Rhino WIP and got this out:

(sorry the file is bigger than 20mb, I had to upload it to wetransfer)

yoiu might want to run

reducemesh

with planar only settings to reduce the file a bit.

hope this helps

Ben

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4

Thank you Ben, I will give that a try!

And yes, I come across a lot of these tiny or line-like faces when investigating after failed Boolean operations. I don’t really know where they come from knowing that I am somewhat aware of good modelling practices and use the right tolerance.

I will leave the topic as unsolved for now to see if there is more interest.

5

Hi @xy236, @benedict,

Give this a try.

test_heal_mesh.gh (170.1 KB)

Grasshopper should probably do this for you…

https://mcneel.myjetbrains.com/youtrack/issue/RH-74187

– Dale

2 Likes
6

Wow, this is really good!

7

Thanks Dale! HealNakedEdges is really cool! I also find “AlignVertices” helpful sometimes.

8

RH-74187 is fixed in Rhino 7 Service Release 30

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