Identify some nodes near a known node

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Is there a way to identify the upper and lower nodes of this geometry by knowing a node?
nodes = importdata("NODES.mat");
faces = importdata("FACES.mat");
P1 = [28.9646, -21.3886, 97.3614];
P2 = [17.2506, -22.7154, 62.1242];
figure
plot3(nodes(:,1),nodes(:,2),nodes(:,3),'k.','Markersize',2);
hold on
trimesh(faces(:,:),nodes(:,1),nodes(:,2),nodes(:,3),'EdgeColor','k','Linewidth',0.1,'Facecolor','b','FaceAlpha',0.2)
plot3(P1(:,1),P1(:,2),P1(:,3),'r.','Markersize',27);
plot3(P2(:,1),P2(:,2),P2(:,3),'r.','Markersize',27);
hold off
axis equal

Risposta accettata

Fabio Freschi
Fabio Freschi il 9 Ott 2023
Modificato: Fabio Freschi il 9 Ott 2023
You can use featureEdges. You get both upper and lower nodes, but it's not difficult to distinguish them
You can also check for nodes lying on the plane, as I suggested in yhe answer to your previous question here
nodes = importdata("NODES.mat");
faces = importdata("FACES.mat");
P1 = [28.9646, -21.3886, 97.3614];
P2 = [17.2506, -22.7154, 62.1242];
figure
plot3(nodes(:,1),nodes(:,2),nodes(:,3),'k.','Markersize',2);
hold on
trimesh(faces(:,:),nodes(:,1),nodes(:,2),nodes(:,3),'EdgeColor','k','Linewidth',0.1,'Facecolor','b','FaceAlpha',1)
plot3(P1(:,1),P1(:,2),P1(:,3),'r.','Markersize',27);
plot3(P2(:,1),P2(:,2),P2(:,3),'r.','Markersize',27);
% hold off
axis equal
TR = triangulation(faces,nodes);
E = featureEdges(TR,pi/3);
P = nodes(E(:),:);
plot3(P(:,1),P(:,2),P(:,3),'ro','MarkerFaceColor','r')

Più risposte (1)

Matt J
Matt J il 9 Ott 2023
Modificato: Matt J il 9 Ott 2023
It can help. The outliers in d below near correspond to the faces at the caps of the tube. Once you have these faces, you can use TR.ConnectivityList to determine the vertices attached to them.
nodes = importdata("NODES.mat");
faces = importdata("FACES.mat");
P1 = [28.9646, -21.3886, 97.3614];
P2 = [17.2506, -22.7154, 62.1242];
TR=triangulation(faces,nodes);
u=(P1-P2)/norm(P1-P2);
d=faceNormal(TR)*u(:);
plot(d,'x')

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