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Sorry in advance if this question has already been asked, I found nothing to help. I want to buid a 3D box whose top surface is topography. This topography is defined by a DEM i.e. a set of points (x,y,z) where z is the elevation and (x,y) are known on a cartesian grid. How to include this set of points to generate a surface, meshed in triangles, to finally have a 3D mesh with tetraedra.

Thank you in advance for help, Nathalie Glinsky

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Due to the fact you want to create a 3D triangulated surface out of a point cloud that is not necessary a closed surface (as I understand it's a topographical surface which is not closed anyway), the best method I can think of is using Advancing Front Surface Reconstruction method from CGAL: https://doc.cgal.org/latest/Advancing_front_surface_reconstruction/index.html

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