Joined Mesh Still Naked

Rhino Rhino for Windows
1

Hey,

I have a model made up of three meshes. Meshes 1 (cylinder) and 2 (fillet) were meshed from surfaces. Mesh 3 was a meshpatch from the two polylines (red). The polyline between mesh 2 and 3 is the product of DupMeshHoleBoundary of mesh 2. When I join the three meshes and check for naked edges, there is a naked edge along that polyline between meshes 2 and 3. All the vertices line up, why is it still naked?

190930_000
190930_0001425×701 164 KB

190930_001
190930_0011425×701 167 KB

Is there a better way to generate a flat mesh between curves? Meshpatch seems to fill in the cavities, so I have to go around deleting those extra faces. This is the original mesh:

190930_002
190930_0021425×701 158 KB

190930 Temp.3dm (159.4 KB)

2

Hello - run MatchMeshEdge - take the defaults here.

-Pascal

3

Thanks. What exactly does it do? And what was the underlying problem? Seems like it split a few faces in a asymmetrical way.

Before:

190930_005
190930_0051425×701 388 KB

After:

190930_004
190930_0041425×701 391 KB

4

See here:

5

why is it still naked?

Have you tried welding it?

6

But mesh 3 was generated from a curve which was derived from the boundary of mesh 2. Mesh 2 and 3 should have a coincident boundary here.

Welding did not remedy the nakedness.

@pascal gave the right solution. I am trying to understand the underlying problem so I am prepared to deal with it the next time it occurs.

7

Welding by vert distance worked for me (in Grasshopper with MeshEdit)

Before weld by distance you can see that inner circle reads as naked:

Capture
Capture.PNG2024×758 340 KB

After weld by distance now it is not naked there:

Capture2
Capture2.PNG1987×755 357 KB

Here is the GH and the Mesh file after welding:
WeldDist.gh (4.7 KB)
WeldDist.3dm (342.4 KB)

8

That’s funny. I have done this in the past. However, I was hoping that Rhino’s weldvertices would work the same way. I did not want to jump into grasshopper for something that seems so simple.

9

Actually it is simple to join edges, use “match mesh edges” and give DistanceToAdjust = 0.01

10

Hi @lawrenceyy, try the _PlanarMesh command, it works with holes. Also: check your mesh normal directions before joining (or welding).

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c.