Hello Ian, > I meant to use CarpetMask; isn't this a way to mask points from reductions? CarpetMask does not directly offe a "mask" grid function instead it has code (and parameters) to mark a spherical region or the interior of a spherical surface as to be ignored.
It does so by modifying the "weight" grid function in CarpetReduce which is used by all reductions, so modifying it for one thorn will make reductions behave unexpectedly for all thorns. This may be sufficient for the original issue namely to "exclude the boundary contribution to the calculation". It will be remove that contribution from any and all reduction operations. You could also modify CarpetReduce::weight directly by setting it to zero in regions you want to exclude. Yours, Roland -- My email is as private as my paper mail. I therefore support encrypting and signing email messages. Get my PGP key from http://keys.gnupg.net.
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