*
* The ordering of vertices and faces (lines) in 2d is defined by
*
- * N1) vertices are numbered in lexicographic ordering
+ * - Vertices are numbered in lexicographic ordering
*
- * N2) faces (lines in 2d): first the two faces with normals in x-
- * and then y-direction. For each two faces: first the face with
- * normal in negative coordinate direction, then the one with normal
- * in positive direction, i.e. the faces are ordered according to
- * their normals pointing in -x, x, -y, y direction.
+ * - Faces (lines in 2d): first the two faces with normals in x-
+ * and then y-direction. For each two faces: first the face with
+ * normal in negative coordinate direction, then the one with normal
+ * in positive direction, i.e. the faces are ordered according to
+ * their normals pointing in -x, x, -y, y direction.
*
- * N3) the direction of a line is represented by the direction of
- * point 0 towards point 1 and is always in one of the coordinate
- * directions
+ * - The direction of a line is represented by the direction of
+ * point 0 towards point 1 and is always in one of the coordinate
+ * directions
*
- * N4) face lines in 3d are ordered, such that the induced 2d local
- * coordinate system (x,y) implies (right hand rule) a normal in
- * face normal direction, see N2/.
+ * - Face lines in 3d are ordered, such that the induced 2d local
+ * coordinate system (x,y) implies (right hand rule) a normal in
+ * face normal direction, see N2/.
*
* The resulting numbering of vertices and faces (lines) in 2d as
* well as the directions of lines is shown in the following.
* <h4>Vertices</h4>
*
* The ordering of vertices in 3d is defined by the same rules as in
- * the 2d case, i.e.
+ * the 2d case. In particular, the following is still true:
*
- * N1) vertices are numbered in lexicographic ordering.
+ * - Vertices are numbered in lexicographic ordering.
*
* Hence, the vertices are numbered as follows
* @verbatim
*
* Here, the same holds as for the vertices:
*
- * N4) line ordering in 3d:
- * <ul>
+ * - Line ordering in 3d:
+ * <ul>
* <li>first the lines of face (z=0) in 2d line ordering,
* <li>then the lines of face (z=1) in 2d line ordering,
* <li>finally the lines in z direction in lexicographic ordering
- * </ul>
+ * </ul>
* @verbatim
* *---7---* *---7---*
* /| | / /|
* |/ / | |/
* *---2---* *---2---*
* @endverbatim
- * As in 2d lines are directed in coordinate directions, see N3.
+ * As in 2d lines are directed in coordinate directions.
* @verbatim
* *--->---* *--->---*
* /| | / /|
*
* The numbering of faces in 3d is defined by a rule analogous to 2d:
*
- * N2a) faces (quads in 3d): first the two faces with normals in x-,
+ * - Faces (quads in 3d): first the two faces with normals in x-,
* then y- and z-direction. For each two faces: first the face with
* normal in negative coordinate direction, then the one with normal
* in positive direction, i.e. the faces are ordered according to