How to extract edges of a whole 3D plot and also for the holes in it?

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Faez Alkadi 2017-9-30

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https://ww2.mathworks.cn/matlabcentral/answers/359154-how-to-extract-edges-of-a-whole-3d-plot-and-also-for-the-holes-in-it

评论： Faez Alkadi 2017-10-24

I have used the function (plotIGES) to plot a 3D IGES surface(as shown in the picture and attached).And I want to extract the edges of the whole surface and the hole(s) in it?

According to plotIGES function the surface can be plotted as triangular patches or triangular mesh as shown

FacePlot=plotIGES(ParameterData,1,1,1000,1,10,1,'r');%you can change the second input to 2 to get triangular mesh
xlabel('X')
ylabel('Y')
zlabel('Z')

Help would be appreciated.

Thank you so much.

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Answer 1

KSSV 2017-10-5

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https://ww2.mathworks.cn/matlabcentral/answers/359154-how-to-extract-edges-of-a-whole-3d-plot-and-also-for-the-holes-in-it#answer_284358

在 MATLAB Online 中打开

connectivity.m

clear all
load fv.mat ;
%
tri = fv.faces ;
coor = fv.vertices ;
[e,te,e2t,bnd] = connectivity(coor(:,1:2),tri) ;
triplot(tri,coor(:,1),coor(:,2))
hold on
plot(coor(bnd,1),coor(bnd,2),'*r')