[ET Trac] [Einstein Toolkit] #1222: Reduction weight for periodic domains.

[Einstein Toolkit]

#1222: Reduction weight for periodic domains.
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 Reporter:  bentivegna  |       Owner:  eschnett           
     Type:  defect      |      Status:  new                
 Priority:  minor       |   Milestone:                     
Component:  Carpet      |     Version:  development version
 Keywords:              |  
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 The reduction weight of the internal points neighboring the outer
 boundaries is currently set in a "trapezoidal-rule" manner (1/2 on the box
 faces, 1/4 on the edges, 1/8 on the vertices, in 3D), regardless of the
 nature of the boundaries. In the case of periodic boundaries with a
 Coordbase::boundary_shiftout_* parameter of zero, this leads to the
 assignment of a non-zero weight to some of the boundary points. This only
 yields the correct result if boundary conditions have been applied, which
 sometimes isn't possible/necessary.

 The attached patch introduces some logic in CarpetReduce to take care of
 this case. This may not be the best way to attack the problem though. One
 could tackle the way weight is assigned to zero-shiftout boundaries.
 Perhaps this issue is related to #1221.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1222>
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