sphere model

[shorty2243]

Hello,

I'm trying to build a spherical mesh with concentric layers...I am creating different spheres using the meshasphere function and using mergemesh to bring them together, the result looks like this:

The issue is that the spheres are merging in the centre whereas I need defined regions, more like shells.

Do you know how to do this ?

Thanks!

[Qianqian Fang]

On 03/14/2018 05:59 PM, shorty2243 wrote:

Hello,

I'm trying to build a spherical mesh with concentric layers...I am creating different spheres using the meshasphere function and using mergemesh to bring them together, the result looks like this:

hi

mergemesh() does not work when merging meshes that are overlapping (or
intersecting).

in fact, it only "concatenates" surface or tetrahedral meshes, and does not check
overlapping or intersections.

If you want to merge surfaces with intersection testing, you need to use mergesurf()
or surfboolean(..,'resolve',...).

for the mesh you wanted to create, it should work like this:

[no1,fc1]=meshasphere();
[no2,fc2]=meshasphere();
[no,fc]=mergemesh(no1,fc1,no2,fc2);
regions=[3D_point_in_sphere1; 3D_point_in_sphere2];
[node,elem]=s2m(no,fc,...,regions);


you can not create tet mesh of the two spheres and merge them directly.

Qianqian

The issue is that the spheres are merging in the centre whereas I need defined regions, more like shells.

Do you know how to do this ?

Thanks!

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[shorty2243]

Thankyou!

After running your suggestion I get :

This is close to what I need however rather than thin shells i need volumes such that there are not gaps between the layers, more like this:

Thankyou for the help!

T

[Qianqian Fang]

On 03/14/2018 06:46 PM, shorty2243 wrote:

Thankyou!

After running your suggestion I get :

perhaps you set the parameter holes rather than regions in your s2m call? see

https://github.com/fangq/iso2mesh/blob/master/s2m.m#L4

Qianqian