############
.. index:: single: boundary
.. index:: single: frontière
+.. index:: single: CAO
The object boundary contains all the geometrical definitions allowing to describe a curved boundary to be followed.
There are two modes of description of a boundary:
- - Discrete: this mode is used to describe a curve 1D
- - Analytics: this mode is used to describe a surface
+ - CAO: the boundary comes from the geometry of the domain
+ - Non CAO: if the CAO is not available, the boundary can be approxaimted by its descriptions:
+ * Discrete: to describe the set of 1D curves that defines the boundary
+ * Analytics: to describe every surface that defines the boundary
+
+This choice is:
+
+.. image:: images/create_boundary_1.png
+ :align: center
+
+CAO boundary
+************
+
+The follow-up of a CAO boundary will be made by selecting a boundary chosen in the list of the existing CAO boundaries.
+
+In the starting up, the list is empty. It is necessary to create a first CAO boundary by activation of the button "*New*":
+
+.. image:: images/create_boundary_cao_1.png
+ :align: center
+
+The window invites in the choice of a file that contains the CAO with XAO format. This CAO is the one that is the basis for the initial mesh. A name of boundary is automatically proposed: Boun_1, Boun_2, etc. This name can be modified. It must not already have been used for another boundary, whatever its type.
+
+.. image:: images/create_boundary_cao_2.png
+ :align: center
+
+.. note::
+ The coherence between this CAO and the initial mesh is not checked.
Discrete boundary
*****************
The follow-up of a discrete boundary will be made by selecting a boundary chosen in the list of the existing discrete boundaries.
-In the starting up, the list is empty. It is necessary to create a first discrete boundary by activation of the button "*New*" :
+In the starting up, the list is empty. It is necessary to create a first discrete boundary by activation of the button "*New*":
.. image:: images/create_boundary_di_1.png
:align: center
-The window invites in the choice of a file of mesh. This mesh is the one of all the lines constituting the boundary. A name of boundary is automatically proposed: Boun_1, Boun_2, etc. This name can be modified. It must not already have been used for another boundary.
+The window invites in the choice of a file of mesh. This mesh is the one of all the lines constituting the boundary. A name of boundary is automatically proposed: Boun_1, Boun_2, etc. This name can be modified. It must not already have been used for another boundary, whatever its type.
.. image:: images/create_boundary_di_2.png
:align: center
========
.. index:: single: cylindre
-The cylinder is defined by a point of the axis, its axis and its radius. The axis is defined by a vector. The standard of this vector is not inevitably equal to 1; also, its orientation has no importance. A name of boundary is automatically proposed: Boun_1, Boun_2, etc. This name can be modified. It must not already have been used for another boundary.
+The cylinder is defined by a point of the axis, its axis and its radius. The axis is defined by a vector. The standard of this vector is not inevitably equal to 1; also, its orientation has no importance. A name of boundary is automatically proposed: Boun_1, Boun_2, etc. This name can be modified. It must not already have been used for another boundary, whatever its type.
.. image:: images/create_boundary_an_cy.png
:align: center
======
.. index:: single: sphere
-The sphere is defined by its center and its radius. A name of boundary is automatically proposed: Boun_1, Boun_2, etc. This name can be modified. It must not already have been used for another boundary.
+The sphere is defined by its center and its radius. A name of boundary is automatically proposed: Boun_1, Boun_2, etc. This name can be modified. It must not already have been used for another boundary, whatever its type.
.. image:: images/create_boundary_an_sp.png
:align: center
====
.. index:: single: cone
-A cone is defined by two different manners: the center, the axis and the angle of opening in degree or by two points centered on the axis and the associated radius. A name of boundary is automatically proposed: Boun_1, Boun_2, etc. This name can be modified. It must not already have been used for another boundary.
+A cone is defined by two different manners: the center, the axis and the angle of opening in degree or by two points centered on the axis and the associated radius. A name of boundary is automatically proposed: Boun_1, Boun_2, etc. This name can be modified. It must not already have been used for another boundary, whatever its type.
Creation by an origin, an axis and an angle of opening:
=====
.. index:: single: torus
-The torus is defined by its centre, its axis, the revolution radius and the primary radius. The axis is defined by a vector. The standard of this vector is not inevitably equal to 1; also, its orientation has no importance. A name of boundary is automatically proposed: Boun_1, Boun_2, etc. This name can be modified. It must not already have been used for another boundary.
+The torus is defined by its centre, its axis, the revolution radius and the primary radius. The axis is defined by a vector. The standard of this vector is not inevitably equal to 1; also, its orientation has no importance. A name of boundary is automatically proposed: Boun_1, Boun_2, etc. This name can be modified. It must not already have been used for another boundary, whatever its type.
.. image:: images/create_boundary_an_to.png
:align: center
**************
At the end of this creation of boundaries, the object browser was enriched. We find all the boundaries created, identified there by their name, with the possibility of editing them.
-.. image:: images/create_boundary_1.png
+.. image:: images/create_boundary.png
:align: center
Corresponding python functions
