Assign connectivity ID to 2D triangular mesh

This function assigns an ID based on the connectivity for each cell of a 2D triangular mesh.
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Actualizado 19 jun 2009

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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)

Citar como

David Gingras (2024). Assign connectivity ID to 2D triangular mesh (https://www.mathworks.com/matlabcentral/fileexchange/24005-assign-connectivity-id-to-2d-triangular-mesh), MATLAB Central File Exchange. Recuperado .

Compatibilidad con la versión de MATLAB
Se creó con R2009a
Compatible con cualquier versión
Compatibilidad con las plataformas
Windows macOS Linux
Categorías
Más información sobre Triangulation Representation en Help Center y MATLAB Answers.
Agradecimientos

Inspirado por: Toolbox Wavelets on Meshes

Inspiración para: Remove Unconnected Triangle

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Versión Publicado Notas de la versión
1.2.0.0

The code can takes care of integer inputs.

1.0.0.0