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

3d boarders3d circumference3d contour3d plot3d polygon3d surface plotcircumferencecontourdigital image processinggeom3digespolygonplotigessurfacesurface edge

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.

Best Answer

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')

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MATLAB: I need a function to calculate the hatched area

Since you have polygons that represent the boundaries, use polyarea.

MATLAB: How to combine multiple surfaces and extract data points (faces and vertices ) as one surface

load surfaces.mat ;
coor = cell(5,1) ; 
for N=1:length(Surfaces)
    S.vertices=Surfaces(N).Points;
    S.faces=Surfaces(N).ConnectivityList;
    coor{N} = S.vertices ;
    trisurf(S.faces, S.vertices(:,1),S.vertices(:,2),S.vertices(:,3),'FaceAlpha', 0.5, 'FaceColor', 'r');
    hold on
end
coor = cell2mat(coor) ;
coor = unique(coor,'rows') ;
%

dt = delaunayTriangulation(coor(:,1),coor(:,2)) ;
x = dt.Points(:,1) ; 
y = dt.Points(:,2) ; 
%
idx = knnsearch(coor(:,1:2),[x,y]) ;
z = coor(idx,3) ;
tri = dt.ConnectivityList ;
figure
trisurf(tri,x,y,z)

Best Answer

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MATLAB: I need a function to calculate the hatched area

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