Choose the interpolation level for the regridding.
Use a trilinear interpolation. This is implemented similar to restriction and prolongation
operations in multigrid methods. This ensures that both directions are adjoint to each other.
Use the nearest neighbor for the regridding. This is faster than the linear interpolation.
grid/regridding.F90 : 165
call parse_variable(namespace, "RegriddingInterpolationLevel", LINEAR, this%interpolation_level)
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