Mesh densities in surf2mesh

[Hernan Tupungato]

Dear Qianqian,

I am having trouble in specifying different mesh densities to different layers of the same domain. I am aiming to generate a three layered spherical domain with arbitrary mesh densities in each of them. To do so I build three concatenated spherical shells and use surf2mesh. Although I am inserting arbitrary mesh densities in the max_vol entry (just changing the max_vol scalar with a row vector [max_vol_1, max_vol_2, max_vol_3]), I am not getting to the desired result. 

Would you be able to provide a sample code using the new mesh density functionality in surf2mesh so I can "play" with it?

Would you think in an easier way to construct such multi-layered spherical domain? 

Thanks in advance,

Kind regards,

Hernan

[Qianqian Fang]

hi Hernan

sorry for the delay. have been busy near the end of the semester.

yes, you can specify the desired density using surf2mesh.

this is done by adding a 4th column to the region seeds (regions).

here is an example

[no1,fc1]=meshasphere([0 0 0],10,2);
[no2,fc2]=meshasphere([0 0 0],20,4);
[no3,fc3]=meshasphere([0 0 0],40,4);
[no,fc]=mergemesh(no1,fc1,no2,fc2,no3,fc3);

% define seeds for each region bounded by closed surfaces
seeds=[0 0 0; 15 0 0; 25 0 0];   

seeds(:,4)=[10 1 20]';   % set desired max tet size for each region

[node,elem]=surf2mesh(no,fc,[],[],1,100,seeds);
plotmesh(node,elem,'x>0')

the output mesh plot is attached.

hope this helps.

Qianqian

Thanks in advance,

Kind regards,

Hernan

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[Hernan Tupungato]

Dear Qianqian,

Thanks a lot for your reply! I really appreciate it. 

BTW, let me congratulate you for writing ISO2Mesh, it is a great toolbox.

Kind regards,

Hernan

[Qianqian Fang]

On 4/24/2016 1:56 PM, Hernan Tupungato wrote:

Dear Qianqian,

Thanks a lot for your reply! I really appreciate it.

you are welcome. I am glad it works

BTW, let me congratulate you for writing ISO2Mesh, it is a great toolbox.

can't take all the credits. iso2mesh uses a number of open-source
meshing utilities in the backend, notably, tetgen by Hang Si and
a bunch of tools from the CGAL team (http://cgal.org).

feel free to email if you have any further questions.

Qianqian