MATLAB: 3d plot

delaunay

Hello,
dt = DelaunayTri(x,y);
figure
triplot(dt);
hold on  
t = vertexAttachments(dt,1);
triplot(dt(t{:},:),x,y,'Color','r');
hold off
This is if i have x and y, how can i do it for x,y and z?
Thanks in advance

Best Answer

See Create and Plot a 3D Delaunay Triangulation.
EDIT: Define U=[x(:) y(:) z(:)], then use
dt = DelaunayTri(U);
Plot it using a command like
tetramesh(dt, 'FaceColor', 'cyan');
EDIT 2: Here is an example in which the vertex attachments for vertex 1 are highlighted.
x = rand(20,1); y = rand(20,1); z=rand(20,1);
Plot all the tetrahedra.
U=[x(:) y(:) z(:)];
dt = DelaunayTri(U);
h=tetramesh(dt, 'EdgeColor', 'cyan','FaceColor','none'); hold on
Find simplex attachments and extract the vertex numbers
t = vertexAttachments(dt,1);
tri_attach = dt.Triangulation(t{:},:);
ii = unique(tri_attach(:));
Now plot the tetrahedra for the attached vertices
U = U(ii,:);
dt = DelaunayTri(U);
tetramesh(dt, 'EdgeColor', 'red','FaceColor','none');
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