MEDYAN.get_material_frame

Tuple{MEDYAN.Context, Union{MEDYAN.Place, MEDYAN.Tag}}

get_material_frame(c::Context, x::Union{Tag, Place})::RotMatrix3{Float64}

Return the material frame of x. Throw an error if x doesn’t exist.

The first column is the first direction. The second column is the second direction. The third column is cross(dirs[1], dirs[2]) to complete the right handed frame.