Structure mesh: plot different regions with different colors

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!

[KSSV]

Yes..it can be....how you have data? Attach the data here.

[Xiaohan Du]

Please see the .mat file for data. data.node is the nodal info, data.elem is connectivity, data.region1 is the coordinates for the left circular region, data.region2 is the coordinates for the right circular region. I'd like to use different color to denote these regions. Thank you!

Answer 1

[KSSV]

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')

[Xiaohan Du]

Matlab gave me this figure (in the attachment) which does not seem correct?. I'd like to have edges of the mesh as well.

[KSSV]

Change the edgecolor option to the color you want.

patch('faces',tri(:,2:4),'vertices',coor , ...
    'facevertexcdata' , z, ...
    'facecolor','interp', ...
    'edgecolor','k') ;

[Xiaohan Du]

It gave me this?

[KSSV]

Rotate the figure.....you can change it's orientation....

[KSSV]

tri = data.elem ; 
coor = data.node ;
x = coor(:,1) ; y = coor(:,2) ; z = coor(:,3) ;
trisurf(tri(:,2:4),coor(:,2),coor(:,3),coor(:,3))
view(2) ;
c1 = data.region1 ;
c2 = data.region2 ;
ylim([-20 40])
patch(c1(:,2),c1(:,3),c1(:,3),'r')
patch(c2(:,2),c2(:,3),c2(:,3),'b')

It can be fine tuned to get all elements of circles and plot them in our own color....

[Xiaohan Du]

This is much better, thanks a lot for your help!