Triangulation vertex normal
V = vertexNormal( returns the unit
normal vectors to all vertices in a 3-D surface triangulation.
is a three-column matrix with each row containing the unit normal coordinates
corresponding to the vertices in
Surface of a Cube
Compute and plot the unit normal vectors to the vertices of a triangulation.
Create a 3-D triangulation representing the volume of a cube.
[X,Y,Z] = meshgrid(1:4); x = X(:); y = Y(:); z = Z(:); DT = delaunayTriangulation(x,y,z);
Triangulate the boundary of the cube.
[Tfb,Xfb] = freeBoundary(DT); TR = triangulation(Tfb,Xfb);
Find the unit normal vectors to the triangle vertices.
V = vertexNormal(TR);
Plot the triangulated surface and the unit normal vectors.
trisurf(TR,'FaceColor',[0.8 0.8 1.0]); axis equal hold on quiver3(Xfb(:,1),Xfb(:,2),Xfb(:,3), ... V(:,1),V(:,2),V(:,3),0.5,'Color','b');
ID — Vertex IDs
scalar | column vector
Vertex IDs, specified as a scalar or a column vector whose elements
correspond to a single vertex in the triangulation object. The ID of each
vertex is the corresponding row number of the vertices in the