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Assign connectivity ID to 2D triangular mesh

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05 May 2009 (Updated )

This function assigns an ID based on the connectivity for each cell of a 2D triangular mesh.

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File Information
Description

This function takes an unrestricted triangulation (only the list of triangles, not the node coordinates) and assigns an ID to each group of triangles. If some cells are connected together, each cell of that group will have the same ID. It works like the connectivity-filter of the graphical library VTK.

function groupID=connectivityTri(TRI)
Input :
         "TRI" is mx3 matrix which is the standard list of index of vertices
Output :
          "groupID" is mx1 matrix which is the list of ID-group of each cell

Simple example :

X=[2 1 3 2 5 5 8 6 7 5 8 9 10 12 10 12 13 15 1 0 2 1];
Y=[2 4 4 6 6 8 8 4 2 2 4 6 8 7 5 5 3 2 7 8 8 9];
Z=zeros(size(X));
TRI=[1 2 3;2 4 3;4 3 5;5 6 7;10 8 9;8 9 11;12 13 14;15 16 17;17 16 18;4 6 5;20 19 21;22 21 20];
groupID=connectivityTri(TRI);

trisurf(TRI,X,Y,Z,groupID) (the screenshot of the soumission)

Acknowledgements

Toolbox Wavelets On Meshes inspired this file.

This file inspired Remove Unconnected Triangle.

MATLAB release MATLAB 7.8 (R2009a)
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Comments and Ratings (1)
19 Jun 2009 Óscar J. Rubio Martín

Nice work, fast and accurate. It will let me save a lot of time.

Updates
19 Jun 2009

The code can takes care of integer inputs.

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