Hello, I have a mesh (of a wall) with some openings (holes). I want to get the boundary curve of the wall and also the boundary curve of the openings. I tried naked edges but I did not work properly. Can you help me out? Thanks.

You could use Weaverbird plugin Weaverbird’s naked boundary component [image]

You can also use the MEdges (Mesh Edges) component. and get the naked mesh edges from it’s E1 output. The edges are individual lines, but you can join them to get the polylines.

Thanks for your answer @kts.nguyenhoangloc , @diff-arch . I have one more question, how can I know which curves are belong to the holes and which curves are the boundary of the wall (programmatically)?

[image] name23926: I have one more question, how can I know which curves are belong to the holes and which curves are the boundary of the wall (programmatically)? If the area (or perimeter) of your boundary curve is always bigger than the area (or perimeter) of each individual opening outline…

another way which use Medges [image] re2.gh (9.8 KB)

You can also call this method of the Rhino mesh class (in e.g. GHPython/C#): [0%20Educational%20-%20%5BTop%5D] 191017_GetNakedEdges_GHPython_00.gh (29.2 KB) (also note how having the largest length does not guarantee this is the outer perimeter)

Greetings from post-Covid age, I’ve tried Wb naked boundary, Mesh Edges, and @AndersDeleuran method, non is working with my mesh. What happened with my mesh? [Q_MeshBoundary] Q_MeshBoundary.gh (92.6 KB)

Try aligning and welding the vertices first, see this topic: [image] Weld meshes inside of GH Grasshopper Hi, I thought this was going to be easy. I simply want to weld mesh inside of Grasshopper. I tried doing so via Python Script. The weld function does not seem to ex…

I got another solution, rebuild mesh to surfaces, Brep Edges works perfectly.

Mesh to boundary curve (opening included)

Grasshopper

AndersDeleuran April 20, 2023, 1:14pm 10

Try aligning and welding the vertices first, see this topic:

Topic		Replies	Views
Mesh naked boundary - any method to make faster and accurate? Grasshopper windows , python , rhino7 , grasshopperrhino	8	373	November 28, 2024
Grasshopper - Finding the outer boundary of a collection of curves Grasshopper windows	14	5015	October 26, 2022
Outer contour curve from mesh Grasshopper	7	9801	May 9, 2018
How to Extract the the outer boundary polyline of a Mesh? Grasshopper windows	4	285	June 15, 2025
Detect multiple boundary curve Grasshopper windows	6	388	September 24, 2021

Mesh to boundary curve (opening included)

Related topics