23179: EDF 11603 - Problem with extrusion when path is not well oriented

[modules/smesh.git] / doc / salome / gui / SMESH / input / quad_from_ma_algo.doc

diff --git a/doc/salome/gui/SMESH/input/quad_from_ma_algo.doc b/doc/salome/gui/SMESH/input/quad_from_ma_algo.doc
index 80c3f59aaf4fd6eb256865742c0d7d660d1379e3..6a90f376e4e63b7de1e9bba8c631fbf7815c1c2a 100644 (file)
--- a/doc/salome/gui/SMESH/input/quad_from_ma_algo.doc
+++ b/doc/salome/gui/SMESH/input/quad_from_ma_algo.doc
@@ -5,13 +5,18 @@
 Medial Axis Projection algorithm can be used for meshing faces with
 sinuous borders and having channel-like shape, for which is it
 difficult to define 1D hypotheses so that generated quadrangles to be
 Medial Axis Projection algorithm can be used for meshing faces with
 sinuous borders and having channel-like shape, for which is it
 difficult to define 1D hypotheses so that generated quadrangles to be

-of good shape.
+of good shape. The algorithm can be also applied to faces with ring
+topology, which can be viewed as a closed 'channel'. In the latter
+case radial discretization of a ring can be specified by
+using <em>Number of Layers</em> or <em>Distribution of Layers</em>
+hypothesis.

 
 

-\image html quad_from_ma_mesh.png "A mesh of a river model"
+\image html quad_from_ma_mesh.png "A mesh of a river model to the left and of a ring-face to the right"

 
 The algorithm assures good shape of quadrangles by constructing Medial
 Axis between sinuous borders of the face and using it to
 
 The algorithm assures good shape of quadrangles by constructing Medial
 Axis between sinuous borders of the face and using it to

-discretize the borders.
+discretize the borders. (Shape of quadrangles can be not perfect at
+locations where opposite sides of a 'channel' are far from being parallel.)

 
 \image html quad_from_ma_medial_axis.png "Medial Axis between two blue sinuous borders"
 
 
 \image html quad_from_ma_medial_axis.png "Medial Axis between two blue sinuous borders"
 


@@ -22,9 +27,9 @@ The Medial Axis is used in two ways:
   Axis.</li>
 <li> If there is no sub-meshes on the sinuous borders, then a part of
   the Medial Axis that can be mapped to both borders is discretized
   Axis.</li>
 <li> If there is no sub-meshes on the sinuous borders, then a part of
   the Medial Axis that can be mapped to both borders is discretized

-  using a hypothesis assigned to the face or its ancestor shapes,
+  using a 1D hypothesis assigned to the face or its ancestor shapes,

   and the division points are mapped from the Medial Axis to the both
   and the division points are mapped from the Medial Axis to the both

-  borders.</li>
+  borders to find positions of nodes.</li>

 </ol>
 
 */
 </ol>
 
 */