And is the local coordinate system then (what axes?)?
The axes are what you like. Let you define the principal axis Xinit of
you beam section in reference coordinate system (which we don't do
usually, just because we don't need). Then apply
ScGeom::rotateAndGetShear(X) on it (I should definitely split "rotate"
and "getShear" for consistency... one more TODO), exactly as we do for
contact forces. It will keep track of you local X orientation, so that
you can project everything on it (e.g. fn, fx, fy) in the constitutive law.
Bruno
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