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Exclude some nodes from a 3D point cloud (select only neighboring nodes)

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Alberto Acri
Alberto Acri 2023-5-11
编辑： Matt J 2023-5-13
Hi! I would need code to create a matrix of nodes excluding those circled in red. Is there any code that I could use?
I would need a code where, for example, I select a node I am interested in and it automatically selects all neighboring nodes (within a certain distance x,y,z).
selection = importdata("selection.mat");
figure
plot3(selection(:,1),selection(:,2),selection(:,3),'b.','Markersize',5)
grid on
hold on
axis equal
xlabel('x')
ylabel('y')
zlabel('z')

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采纳的回答

Matt J
Matt J 2023-5-13
编辑：Matt J 2023-5-13
Ran in:
X=load('selection').selection; %shorten data name
G=graph(pdist2(X,X)<=10);
T=conncomp(G);
[~,i]=max(histcounts(T,[unique(T),inf]));
I=T==i;
plot3(X(I,1),X(I,2),X(I,3),'b.','Markersize',5); hold on
plot3(X(~I,1),X(~I,2),X(~I,3),'r.','Markersize',5); hold off
grid on
axis equal
xlabel('x'),ylabel('y'),zlabel('z')

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