Hello,

I want to apply the following Dirichlet boundary conditions:

n \times E_s = n \times E_i

where E_i is given. For standard rectangles this is quite easy, because there is only one non-zero component in the normal n. But I want to apply it on the boundary of a ball, hence this trick does not work anymore. My idea was to add some constraints to the ConstraintMatrix directly, but I have no idea how to handle the rotation of the components.

Did anyone already implement something like this or does anyone know how to do it?

Thanks,
Markus
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