[ET Trac] [Einstein Toolkit] #448: CartGrid3D symmetries don't work with Carpet-hg

[Einstein Toolkit]

#448: CartGrid3D symmetries don't work with Carpet-hg
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 Reporter:  eschnett  |       Owner:     
     Type:  defect    |      Status:  new
 Priority:  major     |   Milestone:     
Component:  Cactus    |     Version:     
 Keywords:            |  
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 The symmetries implemented in CartGrid3D (bitant, quadrant, and octant
 mode) do not work with Carpet-HG. They register a symmetry width equal to
 the number of ghost zones, but do so at a time when the number of ghost
 zones is not defined. They should instead query CoordBase for the number
 of boundary points. However, this may break many old parameter files that
 e.g. use PUGH.

 Another alternative would be to always use ReflectionSymmetry with Carpet-
 HG instead of CartGrid3D's symmetries.

 This affects currently e.g. the test case
 EinsteinAnalysis/AHFinderDirect/test/Kerr-Cartoon.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/448>
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