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

22 views (last 30 days)
Faez Alkadi on 26 Oct 2017
Commented: Faez Alkadi on 2 Nov 2017
I have 5 surfaces in one file as a (5x1 struct with 2 fields) format, as attached. each one is made of Points(vertices) and ConnectivityList (faces). I was able to trisurf them using for loop as shown in my code. What I want is to combine them as one surface(1x1 struct with 2 fields) which has only one field of Points and only one field of ConnectivityList. so I can trisurf it and deal with it as on surface without for loop.
Thank you so much
SurfaceN.vertices=[];
SurfaceN.faces=[];
for N=1:length(Surfaces);
SurfaceN.vertices=Surfaces(N).Points;
SurfaceN.faces=Surfaces(N).ConnectivityList;
S=SurfaceN;trisurf(S.faces, S.vertices(:,1),S.vertices(:,2),S.vertices(:,3),'FaceAlpha', 0.5, 'FaceColor', 'r');
hold on
end
The 5 surfaces:
The 5 surfaces using trisurf with for loop

KSSV on 27 Oct 2017
Edited: KSSV on 2 Nov 2017
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)
Faez Alkadi on 2 Nov 2017
Thank you KSSV, I appreciate you great effort.

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