]> https://gitweb.dealii.org/ - dealii-svn.git/commitdiff
Announce the last changes merged from branch_general_meshes.
authorleicht <leicht@0785d39b-7218-0410-832d-ea1e28bc413d>
Fri, 9 Feb 2007 09:02:45 +0000 (09:02 +0000)
committerleicht <leicht@0785d39b-7218-0410-832d-ea1e28bc413d>
Fri, 9 Feb 2007 09:02:45 +0000 (09:02 +0000)
git-svn-id: https://svn.dealii.org/trunk@14450 0785d39b-7218-0410-832d-ea1e28bc413d

deal.II/doc/news/changes.html

index 4dd40005e69e22475248d5f0363a001c90b2dd5b..1868bf5c51489b479c4e4328d2370e6aa275c67c 100644 (file)
@@ -211,6 +211,36 @@ inconvenience this causes.
 <h3>General</h3>
 
 <ol>
+  <li> <p>
+       Extended: Up to now, in 3D only 'orientable' meshes could be used in
+       deal.II, i.e. all lines are in standard orientation and the faces can be
+       either in standard orientation or with a reversed normal. In order to
+       enable the treatment of all purely hexahedral meshes, this interface
+       (only the boolean flag <tt>face_orientation</tt> so far) has
+       been extended by new flags <tt>face_flip</tt> and <tt>face_rotation</tt>,
+       denoting a face which is rotated against the 'standard face' by 180 and 90
+       degrees, respectively. Furthermore, there is a new flag
+       <tt>line_orientation</tt> with obvious meaning. 
+                <br> These flags have to be respected during creation and refinement of a
+                triangulation, when projecting quadrature points to faces or when the dof
+                indices on a cell are extracted. Furthermore, asking for vertices and
+                lines of cells is in some cases a bit more complicated. The same applies,
+       for example, 
+                to the extraction of the information, which child of a neighbor is behind
+                a given subface. However, this infomation is supplied by various
+                functions in <code class="class">GeometryInfo</code>. As a rule-of-thumb:
+                if you want to use non-standard meshes, all occurances of
+                <tt>face_orientation</tt> have to be supplemented by <tt>face_flip</tt>
+                and <tt>face_rotation</tt>.
+       <br> In order to reduce the impact of possible bugs, the grid is still given to
+       <code class="class">GridReordering</code>, which now returns the original
+       connectivity if the reordering was not possible.
+       <br> A more detailed document concerning these topics will be available
+       in the future.
+                <br>
+       (Tobias Leicht 2007/02/09)
+       </p>
+
   <li> <p>
        New: a program <tt>reconfigure</tt> has been added to the
        deal.II main directory, which reruns <tt>configure</tt> with

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