Meshing a surface in space into triangles

2022 6 15
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I have a triangulation in space (nv x 3 matrix of x y z vetex coord. and a nf x 3 matrix of connectivity data, see figure).
Now I want to mesh that surface into triangular finite elements of quadratic geometric order e.g. 6 nodes per element using
model = createpde(1)
**************************
...construct geometry??????
**************************
mesh=generateMesh(model,'GeometricOrder','quadratic')
My question: How do I proceed to construct the geometry of the model
Thank you very much, Ansgar.

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