Hi FreeFem community,

I have a 3d mesh and I need to get the data about the number of tetrahedrons and to obtain the adjacent elements of each one. According to the documentation, in 2d i can compute the number of triangles according to the command Th.nt and the adjacencies by Th.adj

https://doc.freefem.org/documentation/mesh-generation.html#mesh-connectivity-and-data

However, it is not specified how to obtain the number of tetrahedrons in 3d. Also, I need to specify each element by its number to compute its adjacencies by using the above command.

Best Regards

Jacob