From: leicht Date: Fri, 9 Feb 2007 09:02:45 +0000 (+0000) Subject: Announce the last changes merged from branch_general_meshes. X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ed96c7cf3d08e0c676a7a790527102e5a4372893;p=dealii-svn.git Announce the last changes merged from branch_general_meshes. git-svn-id: https://svn.dealii.org/trunk@14450 0785d39b-7218-0410-832d-ea1e28bc413d --- diff --git a/deal.II/doc/news/changes.html b/deal.II/doc/news/changes.html index 4dd40005e6..1868bf5c51 100644 --- a/deal.II/doc/news/changes.html +++ b/deal.II/doc/news/changes.html @@ -211,6 +211,36 @@ inconvenience this causes.

General

    +
  1. + 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 face_orientation so far) has + been extended by new flags face_flip and face_rotation, + denoting a face which is rotated against the 'standard face' by 180 and 90 + degrees, respectively. Furthermore, there is a new flag + line_orientation with obvious meaning. +
    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 GeometryInfo. As a rule-of-thumb: + if you want to use non-standard meshes, all occurances of + face_orientation have to be supplemented by face_flip + and face_rotation. +
    In order to reduce the impact of possible bugs, the grid is still given to + GridReordering, which now returns the original + connectivity if the reordering was not possible. +
    A more detailed document concerning these topics will be available + in the future. +
    + (Tobias Leicht 2007/02/09) +

    +
  2. New: a program reconfigure has been added to the deal.II main directory, which reruns configure with