Ill tets with freefem
I'm quite confused about the 3d mesh generated by gmsh, freefem stops and says the mesh contains "badly orienated tet" with very small (10e-18) or zero meseare in these cases :
optimize=0gmsh log looks very fine
optimize=1i get a log with warnings about "ill tets" temp.log
I also set Delaunay Tolerance = 1e-12 as you adviced me.
Sometimes with clmax=1 i get a valid mesh, sometimes not... strange, is there a probabilistic aspect in mesh generation ?