X-Git-Url: http://git.salome-platform.org/gitweb/?p=modules%2Fsmesh.git;a=blobdiff_plain;f=doc%2Fsalome%2Fgui%2FSMESH%2Finput%2Fcartesian_algo.rst;h=76b150e7e484e74be286d56a21cff6146dccd98b;hp=34587287163f679ba08c752055d88f1e74633c16;hb=HEAD;hpb=9d0765db5d66008669b55c3388966a8de3755c92
diff --git a/doc/salome/gui/SMESH/input/cartesian_algo.rst b/doc/salome/gui/SMESH/input/cartesian_algo.rst
index 3458728..76b150e 100644
--- a/doc/salome/gui/SMESH/input/cartesian_algo.rst
+++ b/doc/salome/gui/SMESH/input/cartesian_algo.rst
@@ -59,6 +59,8 @@ This dialog allows to define
* You can specify the **Coordinates** of grid nodes. **Insert** button inserts a node at **Step** distance (negative or positive) from the selected node. **Delete** button removes the selected node. Double click on a coordinate in the list enables its edition. **Note** that node coordinates are measured along directions of axes that can differ from the directions of the Global Coordinate System.
* You can define the **Spacing** of a grid as an algebraic formula *f(t)* where *t* is a position along a grid axis normalized at [0.0,1.0]. *f(t)* must be non-negative at 0. <= *t* <= 1. The whole extent of geometry can be divided into ranges with their own spacing formulas to apply; a t varies between 0.0 and 1.0 within each **Range**. **Insert** button divides a selected range into two. **Delete** button adds the selected sub-range to the previous one. Double click on a range in the list enables edition of its right boundary. Double click on a function in the list enables its edition.
+
+.. note:: The actual grid spacing can slightly differ from the defined one. This is done for the best fitting of polyhedrons and for a better mesh quality on the interval boundaries. For example, if a constant **Spacing** is defined along an axis, the actual grid will fill the shape's dimension L along this axis with round number of equal cells: Spacing_actual = L / round( L / Spacing_defined ).
* **Fixed Point** group allows defining an exact location of a grid node in the direction defined by spacing. The following cases are possible: