This algorithm is used for meshing of 3D entities of
geometrical objects - volume objects.
While NETGEN
generates 3D elements having a volume less than the one specified by hypothesis,
GHS3D does not need any hypotheses, all it needs is a surface mesh built
in advance
To apply the Tetrahedron GHS3D meshing algorithm:
From the Hypotheses
menu select Create Algorithms
> Tetrahedron (GHS3D) and
click Create.