[Developers] Support mesh refinement and multi-patch systems in CartGrid3D

[Thomas Radke]

Erik Schnetter wrote:
> Thorn CactusBase/CartGrid3D initialises the coordinate arrays and  
> registers the coordinate ranges with the flesh.  It currently assumes  
> that it is called on all refinement levels and on all patches of a  
> multi-patch evolution.  This is not so with certain AMR schemes (e.g.  
> with Paramesh) or if a multi-patch simulation distributes different  
> patches to different processors.
> 
> Since CartGrid3D does not actually know anything about mesh refinement  
> or multi-patch setups, I found no way to make things work cleanly in  
> all cases.  I therefore suggest to introduce two new parameters as  
> work-around.  These parameters select in which mode the coordinate  
> range registration is called: level mode, singlemap mode, or local mode:
> 
> BOOLEAN set_ranges_on_all_levels "Set the coordinate ranges on all  levels"
> BOOLEAN set_ranges_on_all_maps "Set the coordinate ranges on all maps"
> 
> The default behaviour is the current behaviour, namely initialisation  
> in local mode.  Paramesh simulations would use  
> "set_ranges_on_all_levels", while multi-patch simulations would use  
> "set_ranges_on_all_maps".

Sounds good to me.

How about introducing a single keyword parameter instead of the 
suggested booleans ?

-- 
Cheers, Thomas.