File Exchange

image thumbnail

Assign connectivity ID to 2D triangular mesh

version 1.2 (2.69 KB) by

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

1 Download

Updated

View License

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)

Comments and Ratings (1)

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

Updates

1.2

The code can takes care of integer inputs.

MATLAB Release
MATLAB 7.8 (R2009a)
Acknowledgements

Inspired by: Toolbox Wavelets on Meshes

Inspired: Remove Unconnected Triangle

Download apps, toolboxes, and other File Exchange content using Add-On Explorer in MATLAB.

» Watch video