Wolfgang,
indeed, this should be possible to do it that way. Would you mind putting 
an example to the mentioned github issue? I might give it a thought in the 
background if I see more details. 

Best
Alexander

On Tuesday, June 25, 2019 at 9:49:15 PM UTC+2, Wolfgang Bangerth wrote:
>
> On 6/25/19 11:55 AM, Daniel Garcia-Sanchez wrote: 
> > According to Alexander Grayver, deal.II interface does not permit 
> dynamic 
> > constraints (that is, constraints, which depend on a cell orientation). 
> This 
> > problem does not seem easy to solve. 
>
> That's only partly true. The DoFTools::make_hanging_node_constraints() 
> class, 
> and the interface it uses to the FiniteElement class, can not deal with 
> such 
> constraints. It assumes that the constraints have the same form on each 
> cell 
> with a hanging node. 
>
> But one doesn't have to go through this function. One could just as well 
> write 
> a function that is specific to the FE_NedelecSZ element and that computes 
> these kinds of constraints and puts them into AffineConstraints. I've done 
> that for other elements before, though I'm not sure there is an example in 
> deal.II itself. I'd be happy to provide my code as an example, though. 
>
> Best 
>   W. 
>
> -- 
> ------------------------------------------------------------------------ 
> Wolfgang Bangerth          email:                 [email protected] 
> <javascript:> 
>                             www: http://www.math.colostate.edu/~bangerth/ 
>
>

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