On Wednesday, April 11, 2018 at 7:00:18 PM UTC+2, Sambit Das wrote:
> Hi Denis,
>> I don't think that's the case. The domain is indeed periodic, but this is 
>> completely detached from location of support/nodal points. 
>> Same applies to geometry, you will have different coordinates of vertices 
>> across the PBC so
> I agree, the location of nodal points is detached from the periodicity of 
> the domain, but in this case the origin is at the center of the hypercube. 
> This artificially enforces that the nodal_coordinate.norm() is periodic. 

true, but I don't see why you would have the same norms if you distribute 
with constraints from hanging nodes only or constraints from hanging nodes+ 
I think we can agree that the two ConstraintMatrix objects should be 
different as in the case of PBC you additionally need to make sure that FE 
space on the refined boundary matches that on the opposite, non-refined 

If you suspect that there is a bug in constraints, you could check this by 
simply choosing some more-or-less random vector, distribute and 
plot-over-line in Paraview / Visit. 
More cumbersome comparison would be to evaluate random field at the 
opposite points.
You can use FEField function and then choose   L/2-\delta  and -L/2+\delta 
  with \delta = 1e-8 or so for X coordinate and then 
whatever you want to Y/Z. This should give you the same value anywhere on 
the two periodically matching points for a random input vector after 
constraints are distributed.

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