Cactus Code Thorn CarpetEvolutionMask Thorn Author(s) : Christian D. Ott, Erik Schnetter Thorn Maintainer(s) : Christian D. Ott, Erik Schnetter -------------------------------------------------------------------------- Purpose of the thorn: Provide a grid function "evolution_mask" which is zero for all grid points that do not need to be evolved because they are going to be restrict from a finer grid.