Create/Export .stl file from a mesh

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Hello,
I have created a model and used generateMesh function that created a mesh and stored it to a model object.
smodel = createpde('structural', 'static-solid');
importGeometry(smodel, 'SquareBeam.STL');
msh = generateMesh(smodel, 'GeometricOrder','linear','Hmin',50);
pdemesh(msh);
Now, I'd like to write this structure to a stl file. I have found stlWrite function in the File Exchange but this function takes faces and vertices as input parameters.
https://www.mathworks.com/matlabcentral/fileexchange/20922-stlwrite-write-ascii-or-binary-stl-files
Is there any way I can extract this data from msh object created in the code above?
Thank you.

Accepted Answer

Cris LaPierre
Cris LaPierre on 15 Sep 2022
You can use the stlwrite function that ships with MATLAB. However, you do need to turn your mesh into a triangulation opject first. I'm not sure I found the best way to do this, but my solution is based on this answer:
smodel = createpde('structural', 'static-solid');
importGeometry(smodel, 'SquareBeam.stl');
pdegplot(smodel)
msh = generateMesh(smodel, 'GeometricOrder','linear','Hmin',50);
pdemesh(msh)
% Extract the edge nodes
N = findNodes(msh,"region","Edge",1:smodel.Geometry.NumEdges);
% Convert to alphashape
shp = alphaShape(msh.Nodes(:,N)');
figure
plot(shp)
% Create triangulation
[T, P] = boundaryFacets(shp);
TR = triangulation(T, P);
stlwrite(TR, 'myMesh.stl');
% check result
bmodel = createpde('structural', 'static-solid');
importGeometry(bmodel, 'myMesh.stl');
pdegplot(bmodel)

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