Generating tetrahedral mesh from nodes

I have a series of nodes in space and I want to generate a tetrahedral mesh from them.

This is how the accurate geometry looks like when I use generateMesh with the stl file.

I take the nodes from mesh and reposition them within the same space using my algorithm. Now I need to rebuild the mesh using these new nodes. When I use delaunayTriangulation, the geometry is not preserved at all.

[Giseok yun]

In my opinion, your new mesh model seems to lack the geometry information.

So, delaunay traingulation is performed only with the nodal points.

Using the alpha shape first and then performing delaunay triangulation might work

(You can adjust the alpha shape parameter to give more detail to the existing nodal points and their boundaries)

I think using the matlab command "geometryFromMesh" seems more conveneint.

You can attach the geometry information to the nodal points you have.

1. From the original mesh, extract out the geometry information
2. Copy the geometry information to the new nodal set you generated.
3. generateMesh

Create 2-D or 3-D geometry from mesh - MATLAB geometryFromMesh (mathworks.com)

[Bruno Luong]

"I take the nodes from mesh and reposition them within the same space using my algorithm. "

Why you take only the nodes and not import the mesh meaning with correct face info? Why to rebuild something that you already have?