How to save alphashape image as STL or CAD?

How to save alphashape image as STL or CAD? can any share idea's?

Answer 1

[Sean de Wolski]

Get the alphaTriangulation from the alphaShape and then call stlwrite (new in 18b)

A = alphaShape(rand(10,2))
[T, P] =  alphaTriangulation(A)
stlwrite(triangulation(T,P),'foo.stl')

[Selva Karna]

its show error, input must be a row vector of charecters or string scalar?

[Selva Karna]

its showing tetrahedron triangulation is not support? how to solve sean de wolski

[Selva Karna]

Thanks Sean de Wolski .

[Sean de Wolski]

Did you resolve this? The tetrahedra are made up of triangles as its faces. You'll need to extract each triangle as its own entity. It should be just a little bit of indexing. Let me know if you want an example (Not sure if you figured it out since the answer was accepted).

[Niccolo Cymbalist]

Could you please provide an example for this?

[Dmitrij Usov]

use boundaryFacets instead alphaTriangulation for nx3 matrices

A = alphaShape(rand(10,3));
[T, P] =  boundaryFacets(A); % here
stlwrite(triangulation(T,P),'foo.stl');

for more https://uk.mathworks.com/matlabcentral/answers/473495-stlwrite-error-tetrahedron-triangulation-is-not-supported

Answer 2

[KSSV]

Use this: https://in.mathworks.com/matlabcentral/fileexchange/20922-stlwrite-write-ascii-or-binary-stl-files

[Selva Karna]

thanks for reply, but its not generate grid, like above 3d Image stl. how to generate grid using x,y,z? KSSV