From cc166f37e2018ed986f66ba5624c842edbd34e64 Mon Sep 17 00:00:00 2001
From: Christophe Geuzaine <cgeuzaine@ulg.ac.be>
Date: Fri, 3 Mar 2017 14:04:59 +0000
Subject: [PATCH] better explanation of Boundary
---
doc/texinfo/gmsh.texi | 16 +++++-----------
1 file changed, 5 insertions(+), 11 deletions(-)
diff --git a/doc/texinfo/gmsh.texi b/doc/texinfo/gmsh.texi
index 9846cda888..3aeefc3edd 100644
--- a/doc/texinfo/gmsh.texi
+++ b/doc/texinfo/gmsh.texi
@@ -2366,23 +2366,17 @@ Translates all elementary entities in @var{transform-list}. The
the X, Y and Z components of the translation vector.
@item Boundary @{ @var{transform-list} @}
-(Not a transformation per-se.) Returns the boundary of the elementary
-entities in @var{transform-list}.
+(Not a transformation per-se.) Returns the entities on the boundary of
+the elementary entities in @var{transform-list}, with signs indicating
+their orientation in the boundary. To get unsigned tags (e.g. to reuse
+the output in other commands), apply the @code{Abs} function on the
+returned list.
@item CombinedBoundary @{ @var{transform-list} @}
(Not a transformation per-se.) Returns the boundary of the elementary
entities, combined as if a single entity, in
@var{transform-list}. Useful to compute the boundary of a complex part.
-@item OrientedBoundary @{ @var{transform-list} @}
-(Not a transformation per-se.) Returns the boundary of the elementary
-entities in @var{transform-list}, with signs indicating their orientation.
-
-@item CombinedOrientedBoundary @{ @var{transform-list} @}
-(Not a transformation per-se.) Returns the (oriented) boundary of the
-elementary entities, combined as if a single entity, in
-@var{transform-list}. Useful to compute the boundary of a complex part.
-
@c @item Intersect Line @{ @var{expression-list} @} Surface @{ @var{expression} @}
@c (Not a transformation per-se.) Returns the intersections of the lines
@c given in @var{expression-list} with the specified surface.
--
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