Determines the direction in which the dimensions are chosen to compute
the blocked index for sorting the mesh points (see MeshBlockSize).
The default is increase_with_dimensions, corresponding to xyz ordering
in 3D.
Options:
increase_with_dimension:
The fastest changing index is in the first dimension, i.e., in 3D this
corresponds to ordering in xyz directions.
decrease_with_dimension:
The fastest changing index is in the last dimension, i.e., in 3D this
corresponds to ordering in zyx directions.