MATLAB: Structure mesh: plot different regions with different colors

mesh

Hi all,

I have a 2D mesh with different regions, like this:

I generated a mesh for this beam

Is there a way to highlight the 2 circles with different colors?

Many thanks!

Best Answer

load data.mat ;
tri = data.elem ; 
coor = data.node ;
x = coor(:,1) ; y = coor(:,2) ; z = coor(:,3) ;
patch('faces',tri(:,2:4),'vertices',coor , ...
    'facevertexcdata' , z, ...
    'facecolor','interp', ...
    'edgecolor','none') ;
hold on
c1 = data.region1 ;
c2 = data.region2 ;
patch(c1(:,1),c1(:,2),c1(:,3),'r')
patch(c2(:,1),c2(:,2),c2(:,3),'b')

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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)

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

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')

Best Answer

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

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

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