Problem using boundary and trisurf functions to create a mesh with three points
2 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Elena Martín
le 25 Mar 2019
Réponse apportée : John D'Errico
le 25 Mar 2019
Hi, I am having some difficulties using these functions. I have three points and I would like to create a mesh with them, if I have four points these work perfectly but when I only insert three points boundary returns and empty matrix. I would like to know whats wrong and if there is anyway I can fix it. What I want is to create a surface between those three points, maybe there is another way to do it but I cant figure it out. Thanks!
p(1,1) = -26,9030200000000;
p(1,2) = 74,5056900000000;
p(1,3) = 1,76957800000000
p(2,1) = -31,3498700000000;
p(2,2) = 71,4396500000000;
p(2,3)= 26,4499500000000;
p(3,1) = 26,9030200000000;
p(3,2) = 74,5056900000000
p(3,3) = 1,76957800000000;
k = boundary(p)
hold on
trisurf(k,p(:,1),p:,2),p(:,3),'Facecolor','red','FaceAlpha',1)
%'EdgeColor', 'none')
grid off
0 commentaires
Réponse acceptée
John D'Errico
le 25 Mar 2019
You have THREE points, in a 3 dimensional space.
How many points determine a volume in 3-d? 4. Essentially, a tetrahedron in 3 dimensions is as simple as you can get. So if you have only 3 points, they determine a triangle. But they are not sufficient to determine a tetrahedron. And you certainly will not create a boundary surface in 3-d.
If your goal is as simple as creating a surface that spans those 3 points, then this is simple. Just use patch.
patch(p(:,1),p(:,2),p(:,3),'r')
box on
grid on
0 commentaires
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Surface and Mesh Plots dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!