Reference documentation for deal.II version Git 409ee4b167 20200814 09:46:12 0400

#include <deal.II/base/geometry_info.h>
Public Types  
enum  Possibilities { case_none = 0, case_x = 1, case_x1y = 2, case_x2y = 3, case_x1y2y = 4, case_y = 5, case_y1x = 6, case_y2x = 7, case_y1x2x = 8, case_xy = 9, case_isotropic = case_xy } 
A class that provides all possible situations a face (in the current space dimension dim
) might be subdivided into subfaces.
This specialization is used for dim=3, where it offers following possibilities: a face (quad) being refined in x or ydirection (in the faceintern coordinate system) separately, (case_x
or (case_y
), and in both directions (case_x
which corresponds to (case_isotropic
). Additionally, it offers the possibilities a face can have through repeated anisotropic refinement steps performed on one of the two neighboring cells. It might be possible for example, that a face (quad) is refined with cut_x
and afterwards the left child is again refined with cut_y
, so that there are three active subfaces. Note, however, that only refinement cases are allowed such that each line on a face between two hexes has not more than one hanging node. Furthermore, it is not allowed that two neighboring hexes are refined such that one of the hexes refines the common face with cut_x
and the other hex refines that face with cut_y
. In fact, Triangulation::prepare_coarsening_and_refinement takes care of this situation and ensures that each face of a refined cell is completely contained in a single face of neighboring cells.
The following drawings explain the SubfacePossibilities and give the corresponding subface numbers:
Definition at line 1125 of file geometry_info.h.
enum internal::SubfacePossibilities< 3 >::Possibilities 
Possible cases of faces being subdivided into subface.
See documentation to the SubfacePossibilities<3> for more details on the subface possibilities.
Enumerator  

case_none  
case_x  
case_x1y  
case_x2y  
case_x1y2y  
case_y  
case_y1x  
case_y2x  
case_y1x2x  
case_xy  
case_isotropic 
Definition at line 1133 of file geometry_info.h.