Thanks, the only alternative I am left with is therefore having a flattened 
mesh and defining my own hanging node constraints with 
System::attach_constraint_object(). The only issue is that I need to be careful 
with the refinement.
-- 
 

On 1/25/18, 12:48 PM, "Roy Stogner" <royst...@ices.utexas.edu> wrote:

    
    On Thu, 25 Jan 2018, Salazar De Troya, Miguel wrote:
    
    > An easier question to make would be: Can I have a parent element
    > with just two children?
    
    Ah!  I'm not sure if this was an easier question to make, but it's a
    *much* easier question to answer: no.
    
    The last time I tried counting, we had literally more than a hundred
    places where libMesh core library code made the core assumption that
    any hierarchical refinement was done isotropically.  IIRC there are
    even many places in the code that make the assumption that the
    refinement pattern within each parent element of a hierarchic mesh
    matches one of the few refinement patterns which libMesh creates
    itself.
    
    It's something we'd all love to change; anisotropic AMR is nice.  But
    I don't see it changing any time soon.
    ---
    Roy
    

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