Plot mesh with color

[chuan...@hotmail.com]

Hello Qianqian,

Hope this finds you well. I have generated a mesh and want to have a color gradient on the mesh. I have tried to assigned numbers to the 5th column of elem variable, but this gives me a random color, which is distracting. 

Also, I have tried "caxis", it gave me a pretty mesh plot long time ago, but this time, it seems it does not work. 

I have attached my code but somehow the image stack was not uploaded successfully. Please find the stack from this link https://www.dropbox.com/s/0hiezfo3d4ew5zf/0.6_geometry.tif?dl=0

Hope to get some recommendations from you and thank you in advance!

-Chuanyue

[Qianqian Fang]

hi Chuanyue

not sure what exactly the color gradient you wanted to see on with the mesh, but from reading your code, your current plotmesh line maps the element index (labellist_elem) as the color, which is rather a random label in space.

in order for this to be a gradient, you need to assign each element with a value that varies continuously over space. for example, you can plot the z*y of the centroid of each element using

c0=meshcentroid(node,elem(:,1:4));
plotmesh(node(:,1:3),[elem(:,1:4) c0(:,3).*c0(:,2)],'facealpha','0.7')

alternatively, you can also plot a gradient with a continuously varying nodal value, for example, a y-dir gradient

plotmesh(node(:,[1 2 3 2]),elem(:,1:4),'facealpha','0.7')

typically, I use the element-label for plotting a segmented domain, which is often a piecewise constant domain

 

[nobbx,fcbbx]=meshabox([40 0 0], [160, 120, 60], 10);
[nosp,fcsp]=meshasphere(s0, 5, 1);
[no,fc]=mergemesh(nobbx, fcbbx, nosp, fcsp);

[cfg0.node, cfg0.elem]=s2m(no,fc(:,1:3),1,40,'tetgen',[41 1 1;s0]);

cfg0.seg=cfg0.elem(:,5);

plotmesh(cfg0.node,[cfg0.elem,cfg0.seg],'z<20')
view([0 0 1])

hope this helps.

Qianqian

-Chuanyue

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[chuan...@hotmail.com]

Hello Qianqian,

Sorry for replying late. The suggestions you provided worked very well. Thank you very much for your help!

BR,

Chuanyue