trimesh and trisurf produces a very bad triangulation results?!!

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Ano 2017-3-13

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https://ww2.mathworks.cn/matlabcentral/answers/329531-trimesh-and-trisurf-produces-a-very-bad-triangulation-results

回答： Ano 2017-3-15

Hello! I am trying to model a closed surface, but trimesh and trisurf produces a very bad plot, how can I improve it?: is there any other functions to use instead ?! Thank you!! Note: below is the code I am using:

figure(1)
trisurf(t,p(1,:),p(2,:),p(3,:));title('ploted using trisurf ')
figure(2)
trimesh(t,p(1,:),p(2,:),p(3,:));title('ploted using trimesh ')

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KSSV 2017-3-13

trisurf, trimesh plots only what you give. If you want a good plot, you need to increase the data points. By the way, why you feel that plot is bad?

John D'Errico 2017-3-13

编辑：John D'Errico 2017-3-13

The problem is NOT trimesh or trisurf. It is in how you created the input to those tools.

A closed surface? Unless you have a triangulation that corresponds to a closed surface, then you can't expect much. So how did you generate t?

My guess is you used delaunay or some tool like it, but in a way that is not valid to produce a closed surface. Or possibly you used a convex hull tool, on a strongly non-convex set of points.

We cannot know what you did here. It would help if you:

1. Attach (using the paper clip icon) to a comment a .mat file that contains the data.

2. Show us how you generated t. Show the complete code, not just the code you used to plot it.

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Answer 1

Ano 2017-3-15

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https://ww2.mathworks.cn/matlabcentral/answers/329531-trimesh-and-trisurf-produces-a-very-bad-triangulation-results#answer_258857

hello! the problem was that the triangles contained not only the nodes but also their domain number (inside or out side the object) so when I used only the nodes of the triangle it worked perfectely using:

(I meant by bad it generates parallelogram instead of triangles)

figure(1) trisurf(t(1:3,:),p(1,:),p(2,:),p(3,:));title('ploted using trisurf ')