Howto calculate the Volume of a triangular mesh after using the triangulation function

Hello together,

I extracted from an existing mesh from another program and specific data format information about the points (x,y,z) and the connectivity table. Both information works perfectly with the triangulation function https://de.mathworks.com/help/matlab/ref/triangulation.html , which allows me to reproduce the 3D-mesh in matlab with the same elements. But here I got stuck. I need the volume of the resulting geometry. I found two functions which seems promising but both failed https://de.mathworks.com/matlabcentral/fileexchange/26982-volume-of-a-surface-triangulation and https://de.mathworks.com/matlabcentral/fileexchange/15221-triangulationvolume. Any one else faced once the same problem or has an idea?

Thanks in advance, Markus

[KSSV]

You got tetrahedrons eh?

[Markus]

No, right now its only triangles. You are right this can be a Problem. However, then i have to generate tetrahedrons first. the boundary for 3D tetrahedrons are them the mesh with the defined z coordinates and a plain mesh with Zero elevation. Any idea how to do this?