How to do the example in iso2mesh?

[顾安燕]

Dear iso2mesh users,

I would like to ask how the specific implementation process of the example mentioned below iso2meh is done? I am a newcomer is not very clear. Can anyone give a detailed process? 

2. Demonstration 1 for vol2mesh

The first vol2mesh demonstration is to create an FEM mesh from a CT scan of a rat-head. In this example, the volumetric data is a thresholded CT image of a rat. In a vol2mesh session, we first wrap the volume with a layer of zeros, in order to make the non-zero region close. Then we extract the boundary of the non-zero regions by calling Matlab's isosurface(). The created iso-surface, in the resolution of voxel sizes, will be re-sampled to specified mesh density. Before and after the simplification, we perform a mesh validation and repair process to avoid the appearance of "non-manifold" nodes. Once the surface mesh is completed, we produce volumetric mesh within the region bounded by the re-sampled surface mesh.

Thanks,

Anyan

[Qianqian Fang]

On 1/5/22 22:30, 顾安燕 wrote:

Dear iso2mesh users,

I would like to ask how the specific implementation process of the example mentioned below iso2meh is done? I am a newcomer is not very clear. Can anyone give a detailed process?

although the below description is already outdated (no longer using isosurface() since 2007/8), but in spirit, isn't that what you are looking for?

or you want to understand the underlying algorithms?

please check out these two papers, and I believe those should help explaining the general steps

http://iso2mesh.sourceforge.net/upload/ISBI2009_abstract_final_web.pdf
http://dx.doi.org/10.1117/1.NPh.7.1.015008

Qianqian

2. Demonstration 1 for vol2mesh

The first vol2mesh demonstration is to create an FEM mesh from a CT scan of a rat-head. In this example, the volumetric data is a thresholded CT image of a rat. In a vol2mesh session, we first wrap the volume with a layer of zeros, in order to make the non-zero region close. Then we extract the boundary of the non-zero regions by calling Matlab's isosurface(). The created iso-surface, in the resolution of voxel sizes, will be re-sampled to specified mesh density. Before and after the simplification, we perform a mesh validation and repair process to avoid the appearance of "non-manifold" nodes. Once the surface mesh is completed, we produce volumetric mesh within the region bounded by the re-sampled surface mesh.

Thanks,

Anyan

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[顾安燕]

In fact, I want to ask, I have  generated 3D  volumetric mesh with a binary volume image but it is rough,  what to do can make the mesh  surface smooth?I have been going to upload the picture of me, but I don't know why the function of uploading pictures cannot be used.

[Qianqian Fang]

you can run sms() to smooth out the surface, see this example

https://github.com/fangq/iso2mesh/blob/master/sample/demo_mesh_smoothing.m