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--- doc:user:geometry:user:faces [2014/08/07 17:25] – joris
+++ doc:user:geometry:user:faces [2016/03/30 15:23] (current) – external edit 127.0.0.1
@@ Line 6: / Line 6: @@
 {{ doc:user:doc-faces.png |}}
-A ''Side'' is a set of ''[[doc:user:geometry:user:contours|Wires]]'', to which is associated a surface. The first wire is the external one, the next wires define optional holes. These ''sides'' are used directly in 2D modelling, or gathered in ''[[doc:user:geometry:user:peaux]]'' in 3D.
+A ''Side'' is a set of ''[[doc:user:geometry:user:contours|Wires]]'', to which is associated a ''Surface''. The first ''Wire'' is the external boundary, the next ''Wires'' define optional holes. These ''Sides'' are used directly in 2D modelling, or gathered in ''[[doc:user:geometry:user:peaux]]'' for the definition of the boundaries of ''Volumes'' in 3D.
   side = sideset.add( Side(number, [wire1, wire2, wire3, ...]) )
   side.setSurface(surface)
+with
-| ''number''                | number of the ''Side''                      |
+| ''number''                | user number (unique among Sides and $\ge 1$) |
-| ''wire1''                 | external ''[[contours|Wire]]''              |
+| ''wire1''                 | external ''[[contours|Wire]]'' (boundary)    |
 | ''wire2'', ''wire3''      | internal ''[[contours|Wires]]'' (holes)     |
 | ''surface''               | associated ''[[surfaces|Surface]]''         |
@@ Line 18: / Line 18: @@
 ===== Notes =====
-  * The normal of a side is the normal to its surface.
+  * In contact problems, the normal of a ''Side'' is the normal defined by its ''Surface''.
-  * For rigid contact, the normal must point towards the inside of the matter (as for curves in 2D).
+  * For rigid contact, the normal must point towards the interior of the material (as for curves in 2D).
-  * For sides defined by their surface only (surface of revolution for example), it is allowed to define the face with a ''setSurface'' (the face does not have any wires, and is limited by the parameters $(u,v) = (0,0) \rightarrow (1,1)$ of the surface.
+  * For ''Sides'' defined by their ''Surface'' only (surface of revolution for example), it is allowed to define the ''Side'' without any ''Wire'' (the ''Side'' has an implicit boundary: it is limited by the parameters $(u,v) = (0,0) \rightarrow (1,1)$ of the ''Surface'').