Documentation |
Note: vertexAttachments(TriRep) will be removed in a future release. Use vertexAttachments(triangulation) instead. TriRep will be removed in a future release. Use triangulation instead. |
SI = vertexAttachments(TR, VI)
SI = vertexAttachments(TR, VI) returns the vertex-to-simplex information for the specified vertices VI. For 2-D triangulations in MATLAB^{®}, the triangles SI are arranged in counter-clockwise order around the attached vertex VI.
TR | Triangulation representation |
VI | VI is a column vector of indices into the array of points representing the vertex coordinates, TR.X. The simplices associated with vertex i are the i'th entry in the cell array. If VI is not specified the vertex-simplex information for the entire triangulation is returned. |
SI | Cell array of indices of the simplices attached to a vertex. A cell array is used to store the information because the number of simplices associated with each vertex can vary. The simplices associated with vertex i are in the i'th entry in the cell array SI. |
Load a 2-D triangulation and use TriRep to compute the vertex-to-triangle relations.
load trimesh2d trep = TriRep(tri, x, y);
Find the indices of the tetrahedra attached to the first vertex:
Tv = vertexAttachments(trep, 1) Tv{:}
Perform a direct query of a 2-D triangulation created using DelaunayTri.
x = rand(20,1); y = rand(20,1); dt = DelaunayTri(x,y);
Find the triangles attached to vertex 5:
t = vertexAttachments(dt,5);
Plot the triangulation:
triplot(dt); hold on;
Plot the triangles attached to vertex 5 (in red):
triplot(dt(t{:},:),x,y,'Color','r'); hold off;