**add_l3d2#
Description#
This command adds l3d2 elements to a mesh (see also add_l2d2). These elements link two given nsets which must have the same size.
Syntax#
**add_l3d2
\(~\,\) *nset1 nset1_name
\(~\,\) *nset2 nset2_name
\(~\,\) [ *elset_name ]