Reference documentation for deal.II version Git cb0bd54b52 2019-09-21 16:31:22 -0400
RefinementPossibilities< 3 > Struct Template Reference

#include <deal.II/base/geometry_info.h>

## Public Types

enum  Possibilities {
no_refinement = 0, cut_x = 1, cut_y = 2, cut_xy = cut_x | cut_y,
cut_z = 4, cut_xz = cut_x | cut_z, cut_yz = cut_y | cut_z, cut_xyz = cut_x | cut_y | cut_z,
isotropic_refinement = cut_xyz
}

## Detailed Description

### template<> struct RefinementPossibilities< 3 >

A class that provides possible choices for isotropic and anisotropic refinement flags in the current space dimension.

This specialization is used for dim=3, where it offers refinement in x-, y- and z-direction separately, as well as combinations of these and isotropic refinement in all directions at the same time.

Definition at line 646 of file geometry_info.h.

## ◆ Possibilities

 enum RefinementPossibilities< 3 >::Possibilities

Possible values for refinement cases in the current dimension.

Note the construction of the values: the lowest bit describes a cut of the x-axis, the second to lowest bit corresponds to a cut of the y-axis and the third to lowest bit corresponds to a cut of the z-axis. Thus, the following relations hold (among others):

cut_xy == cut_x | cut_y
cut_xyz == cut_xy | cut_xz
cut_x == cut_xy & cut_xz

Only those cuts that are reasonable in a given space dimension are offered, of course.

In addition, the tag isotropic_refinement denotes isotropic refinement in the space dimension selected by the template argument of this class.

If you choose anisotropic refinement, for example by passing as argument to CellIterator::set_refine_flag() one of the flags RefinementCase::cut_x, RefinementCase::cut_y, RefinementCase::cut_z, or a combination of these, then keep in mind that refining in x-, y-, or z-direction happens with regard to the local coordinate system of the cell. In other words, these flags determine which edges and faces of the cell will be cut into new edges and faces. On the other hand, this process is independent of how the cell is oriented within the global coordinate system, and you should not assume any particular orientation of the cell's local coordinate system within the global coordinate system of the space it lives in.

Enumerator
no_refinement

Do not refine.

cut_x

Perform a cut in the x-direction.

cut_y

Perform a cut in the y-direction.

cut_xy

Perform a cut in the x and y-directions.

cut_z

Perform a cut in the z-direction.

cut_xz

Perform a cuts in the x- and y-directions.

cut_yz

Perform a cuts in the x- and y-directions.

cut_xyz

Perform a cuts in the x-, y-, and z-directions.

isotropic_refinement

Perform isotropic refinement.

Definition at line 682 of file geometry_info.h.

The documentation for this struct was generated from the following file: