X-Git-Url: http://git.salome-platform.org/gitweb/?p=modules%2Fsmesh.git;a=blobdiff_plain;f=doc%2Fsalome%2Fgui%2FSMESH%2Finput%2Fprojection_algos.rst;h=ff0cbbbca87eb7942438b95ca322a9a94921cb93;hp=3b4de91dbe7cea4c10fb04ec748dd9df9339e12f;hb=HEAD;hpb=88141f757b048eaa5aae0be49faaf274448bbcaf

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-.. _projection_algos_page:
-
-*********************
-Projection Algorithms
-*********************
-
-.. contents:: `Table of contents`
-
-Projection algorithms allow to define the mesh of a geometrical
-object by the projection of another already meshed geometrical object.
-
-.. note::
-	Source and target geometrical objects mush be topologically equal, i.e. they must have same number of sub-shapes, connected to corresponding counterparts.
-
-.. image:: ../images/topo_equality.png 
-	:align: center
-
-.. centered::
-	Topologically equal faces suitable for 2D projection.
-
-
-.. _projection_1D:
-
-Projection 1D
-=============
-
-**Projection 1D** algorithm allows to define the mesh of an edge (or group of edges)
-by the projection of another already meshed edge (or group of edges).
-
-To apply this algorithm select the edge to be meshed (indicated in
-the field **Geometry** of **Create mesh** dialog box),
-**Projection1D** in the list of 1D algorithms and click the
-**"Add Hypothesis"** button.
-The following dialog box will appear:
-
-.. image:: ../images/projection_1d.png
-	:align: center
-
-In this dialog you can define
-
-* the **Name** of the algorithm,
-* the already meshed **Source Edge** and 
-* the **Source Mesh** (It can be omitted only when projecting a sub-mesh on another one of the same Mesh).
-* It could also be necessary to define the orientation of edges,  which is done by indicating the **Source Vertex** being the first point of the **Source Edge **and the **Target Vertex** being the first point of the edge being meshed.
-
-
-For a group of edges, **Source** and **Target** vertices should be
-shared by only one edge of the group. If **Source** and **Target**
-vertices are specified, the edges in the group must be connected.
-The source and target groups must contain equal number of edges
-and they must form topologically equal structures.
-
-.. _projection_2D:
-
-Projection 2D
-=============
-
-
-**Projection 2D** algorithm allows to define the mesh of a face
-(or group of faces) by the projection of another already meshed face
-(or group of faces). This algorithm works only if all edges of the
-target face have been discretized into the same number of
-segments as corresponding edges of the source face.
-
-To apply this algorithm select the face to be meshed (indicated in the
-field **Geometry** of **Create mesh** dialog box), **Projection
-2D** in the list of 2D algorithms and click the **"Add Hypothesis"** button. The following dialog box will appear:
-
-.. image:: ../images/projection_2d.png
-	:align: center
-
-In this dialog you can define 
-
-* the **Name** of the algorithm, 
-* the already meshed **Source Face** and 
-* the **Source Mesh** (It can be omitted only when projecting a submesh on another one of the same Mesh). 
-* It could also be necessary to define the orientation of mesh on the face, which is done by indicating two **Source Vertices**, which belong to the same edge of the **Source Face**, and two **Target Vertices**, which belong to the same edge of the face being meshed.
-
-
-The groups of faces are suitable for this algorithm only if they
-contain an equal number of faces and form topologically equal
-structures.
-
-.. _projection_1D2D:
-
-Projection 1D-2D
-================
-
-**Projection 1D-2D** algorithm differs from
-:ref:`projection_2D` algorithm in one aspect: it generates mesh segments
-on edges of the face according to the projected 2D elements; thus it
-does not require the edges to be meshed by any other 1D algorithm;
-moreover it does not allow to mesh edges of the face using another
-algorithm via definition of sub-meshes.
-
-
-.. _projection_3D:
-
-Projection 3D
-=============
-
-**Projection 3D** algorithm allows to define the mesh of a shape by
-the projection of another already meshed shape.  This algorithm works
-only if all faces and edges of the target shape have been meshed as 1D-2D
-Projections of the faces and edges of the source shape. Another
-limitation is that this algorithm currently works only on boxes.
-
-To apply this algorithm select the solid to be meshed (indicated in
-the field **Geometry** of **Create mesh** dialog box), **Projection 3D** 
-in the list of 3D algorithms and click the  button. The
-following dialog box will appear:
-
-.. image:: ../images/projection_3d.png
-	:align: center
-
-In this menu you can define the **Name** of the algorithm, the already
-meshed source **3D shape** and the **Mesh** (It can be omitted only when 
-projecting a submesh on another one from the same global Mesh). 
-It could also be necessary to define the orientation of mesh on the shape, which is
-done by indicating two **Source Vertices**, which belong to the same edge
-of the source **3D Shape**, and two **Target Vertices**, which belong to the
-same edge of the source **3D Shape**.
-
-**See Also** a sample TUI Script of a 
-:ref:`tui_projection`.
-
-
-