Flip curve problems

Replies to This Discussion

Permalink Reply by Hyungsoo Kim on May 19, 2015 at 8:58am

Hi.

Flip won't work because mesh faces are not on the same plane.

Anyway, you can unify mesh face normal direction and switch mesh vertices connection order.

You'll need "MeshEdit" plug-in. 

Attachments:

• M2_re.gh, 19 KB

Permalink Reply by shingyatchun on May 19, 2015 at 7:45pm

If there are a lot of mesh, only some of which need to be flip, there is no better way ？(no manual to judge !)

Permalink Reply by Riccardo Majewski on May 20, 2015 at 1:38am

In a mesh adjacent faces can have incoherent normals. An this make a problem to you.

In a brep this is impossible.

We can take advantage of this!

- converting the mesh in a brep composed of just triangular surface;

- join the surfaces, now the normals are coherent;

- converting back to a mesh.

Try this, hope is good for you. :D

Attachments:

• M2.gh, 17 KB

Permalink Reply by David Rutten on May 20, 2015 at 2:07am

It's not an error, it's a warning. Closed curve orientation becomes less and less well defined the less planar curves are, and if they are planar, the less co-planar they are. If the curve planes were completely perpendicular to each other then there's no way to say the curves have the same orientation. Your meshes are reasonably co-planar so I'd expect the flip curve to work.

As Hyungsoo mentions though the mesh face orientation should be identical for all faces if the mesh normals are correctly oriented and yours aren't: