Hello, when working with meshes I sometimes get the message “Mesh has 3 faces where the face normal differs substantially from the vertex normals.” when checking the meshes. I already try to identify the faces involved following this thread , but I could not solve the issue. Furthermore, my meshes …

Hi Paolo, if you can post the mesh or want to send it via PM i can try to fix it. Usually, if the holes are large and require a smooth fill, i fix it with MeshMixer. The last Script posted in the linked thread is still what i use. It is written in Python now and much faster. _ c.

Yes, but no matter how I try to rebuild normals or to unify them, the problem persists.

Another fact: normals inconsistency doesn’t seem to be related to intersecting edges, because if I use mesh.Faces.GetClashingFacePairs(-1) the returned index pair array is empty.

[image] p.stragliotto: Yes, but no matter how I try to rebuild normals or to unify them, the problem persists. Well, it is possible that the mesh boolean operations might not succeed even if all the normals are OK, this is not one of Rhino’s strong points.

Thank you @clement , I managed to “heal” the faces with inconsistent normals with your VB script. I may try to automatise the process somehow, including a similar step in the workflow I am implementing. Anyway, a manual user interaction is needed to fix issues related to intersecting faces, so I wi…

HI clement, Sorry for contacting you late about this problem. Can i get that Python? I have same problem but i don’t know how to solve it.

Nope, i am using Windows. And thank you for helping me. But i don’t still get it how to solve the problem by this method.

The script does only color the mesh and should indicate problematic areas where the vertex normal deviates most from the surrounding face normal. It does not change the mesh geometry but helps to detect where you need to do repairs. _ c.

Great! Thank you for your answer. Have a nice day~

Vertex / face normals inconsistency

Rhino Rhino for Windows

clement February 15, 2022, 11:56pm 9

Hi @Yoon2, the script (rvb) can be found from the link in the first post. Btw. are you using a mac ?

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c.

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Vertex / face normals inconsistency

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