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Mesh elements: Each mesh element corresponds to one SCGS block.
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Mesh element lines: Anisotropic mesh elements are grouped together in SCGS blocks along the direction of anisotropy, which gives better results for boundary layer meshes. Nonanisotropic mesh elements correspond to one SCGS block.
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Mesh element lines and vertices: Anisotropic mesh elements are grouped together in SCGS blocks, like above. The DOFs corresponding to nonanisotropic mesh elements are solved using vertex-based SCGS blocks, which consume less memory than element blocks. A separate relaxation factor can be set for the vertex pass.
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