To generate vertice mesh from a series of contours

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Erhong
Erhong 2011-4-21
编辑： Jiexian Ma 2025-4-12
Hello,
As beginner in MATLAB, now I have a series of contours, which define a structure. On each contour there are isolated points whose cartesian coordinates are known. Now I would like to generate a mesh from these contours (or points). The MyRobustCrust.m from file exchange does generate a mesh with faces, but without vertices' coordinates. And the vertices are needed for my calculation.
Does any one have any hints? Thank you very much.
Erhong

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采纳的回答

Sarah Wait Zaranek
Sarah Wait Zaranek 2011-4-22
I believe this should work for you.
% Generating some contour data
x = rand(100,1)*4-2;
y = rand(100,1)*4-2;
z = x.*exp(-x.^2-y.^2);
scatter3(x,y,z,'b','filled')
hold on
% Calculating Triangulation
dt = DelaunayTri(x,y,z);
% Finding the surface boundary
[tri xf] = freeBoundary(dt);
trisurf(tri, xf(:,1),xf(:,2),xf(:,3), ...
'FaceColor','cyan', 'FaceAlpha', 0.8);
% Getting the vertices
t1v = xf(tri(:,1),:); %x,y,z for first point in triangles
t2v = xf(tri(:,2),:); %x,y,z for second point in triangles
t3v = xf(tri(:,3),:); %x,y,z for third point in triangles
vert = [t1v; t2v ;t3v];
scatter3(vert(:,1), vert(:,2), vert(:,3),'g','filled')
hold off

更多回答（1 个）

Jiexian Ma
Jiexian Ma 2025-4-12
编辑：Jiexian Ma 2025-4-12
If you plan to work with 2D finite element mesh, the following methods may be helpful.
Personally, I perfer method 2 because you can edit polyshape object easily.
Matlab code
You could check demo14 to demo17 in Im2mesh package. I provide a few examples.

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