[Libmesh-users] Rotation of coordinates in Tet face

[Renato P. <re...@gm...>]

Hello,

I am willing to make a coordinate rotation on a Tet face to calculate
normal and tangent displacements between discontinuous elements.

As I understand, I need a transformation matrix gathering normal and
tangents to define a local coordinate system:
T_ij = [ nx_i ns_i nt_i ]

I can see all the calculations are there, but I am not sure what is the
most elegant/usual way to get such matrix in libmesh.

Any suggestion? Any documentation pointer would be helpful!

Thanks upfront,
Renato