[Developers] CCTK_ORIGIN_SPACE ?

[Erik Schnetter]

On Dec 18, 2007, at 06:29:01, Thorsten Kellermann wrote:

> Hy all together
>
> Can somebody explain me the meaning of this macro, cctk_origin_space ?
> I guess what it should do, but it's not really clear to me, what its
> purpose.


There are two entities, the variable cctk_origin_space, and the macro  
CCTK_ORIGIN_SPACE.  The variable refers to the coarsest grid, the  
macro to the current refinement level.  Without mesh refinement, both  
are the same.

CCTK_ORIGIN_SPACE is the coordinate of the leftmost grid point of the  
current level, i.e., of the grid point with global index 0 in C.  On  
multiple processors, it is the overall leftmost grid point, not the  
leftmost grid point of the current processor.

-erik

-- 
Erik Schnetter <schnetter at cct.lsu.edu>   http://www.cct.lsu.edu/ 
~eschnett/

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