use grid::x,x,y in CarpetIOASCII for x,y,z columns

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Issue #1052 closed
Roland Haas created an issue

right now CarpetIOASCII computes the "local" coordinates from the lower boundary coordinate of each patch and CCTK_DELTA_SPACE. This does not work (as expected) for multipatch.

It would be good to add an option to use grid::x etc instead. Ideally as both a parameter and an option in the '{}' to choose at runtime and per variable what to do (eg. to keep the r coordinate around for spherical patches).

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