Unify Mesh Normals

I have a fairly simple triangle mesh that has some inconsistency in face normals. Any easy way to make these triangles all face the same direction? Thanks.

Replies to This Discussion

Permalink Reply by Daniel González Abalde on April 24, 2015 at 10:48am

Try:

Private Sub RunScript(ByVal x As Mesh, ByRef A As Object)
A = x.UnifyNormals()
End Sub

Permalink Reply by Danila Babko-Malyi on April 24, 2015 at 11:02am

Thanks for the reply. I'm fairly new to VB, what am I missing to get out the mesh?

Permalink Reply by Daniel González Abalde on April 24, 2015 at 11:08am

Ouch, sure...
Write this:

x.UnifyNormals()

A = x

Permalink Reply by Danila Babko-Malyi on April 24, 2015 at 11:43am

VB script ran clean but accomplished the same thing UTO unify normals component did. I was able to test the vectors against each other below, but this solution only works on a flat mesh.

Permalink Reply by Daniel González Abalde on April 24, 2015 at 11:48am

Could you upload the mesh?

Permalink Reply by Danila Babko-Malyi on April 24, 2015 at 11:54am

Attached. Thanks for the help.

Attachments:

Mesh Unify Normals.gh, 5 KB

Permalink Reply by Daniel González Abalde on April 24, 2015 at 12:50pm

Ok well, I attached two solutions, but are unique solutions for your mesh.
The first arranges the points of each face using the direction of one face (only works for cuasi-flat meshes).
The second ordered the two initial groups of meshes and unifies normal in each group, then joins them together.
It is not the solution you expected, but maybe serve to muddle through.

Attachments:

MeshUnifyNormals.gh, 21 KB

Permalink Reply by Daniel González Abalde on April 24, 2015 at 12:59pm

A third solution, ordering the faces by distance + unify normals.

Attachments:

MeshUnifyNormals.gh, 25 KB

Permalink Reply by Daniel González Abalde on April 24, 2015 at 1:44pm

Well I think that mesh is not computationally correct/clean because if you add subdivisions in certain faces, vertices must also add to the topology. You are doing as A, whose new vertices are "above" the edges of faces, whereas in B, neighboring faces are also subdivided to compensate and redefine the topology. I think this may be causing you get strange results.