+\image html image147.gif "Example of a rough mesh at Automatic Length Fineness of 0."
+
+\image html image148.gif "Example of a fine mesh at Automatic Length Fineness of 1."
+
+<br>
+\anchor fixed_points_1d_anchor
+<h2>Fixed points 1D hypothesis</h2>
+
+<b>Fixed points 1D</b> hypothesis allows splitting edges through a
+set of points parametrized on the edge (from 1 to 0) and a number of
+segments for each interval limited by the points.
+
+\image html hypo_fixedpnt_dlg.png
+
+It is possible to check in <b>Same Nb. Segments for all intervals</b>
+option and to define one value for all intervals.
+
+The splitting direction is defined by the orientation of the
+underlying geometrical edge. <b>Reverse Edges</b> list box allows to
+specify the edges for which the splitting should be made in the
+direction opposite to their orientation. This list box is enabled only
+if the geometrical object is selected for meshing. In this case it is
+possible to select the edges to be reversed either directly picking them in
+the 3D viewer or selecting the edges or groups of edges in the
+Object Browser.
+
+\ref reversed_edges_helper_anchor "Helper" group assists you in
+defining <b>Reversed Edges</b> parameter.
+
+
+\image html mesh_fixedpnt.png "Example of a sub-mesh on the edge built using Fixed points 1D hypothesis"
+
+<b>See Also</b> a sample TUI Script of a
+\ref tui_fixed_points "Defining Fixed Points" hypothesis operation.
+
+\anchor reversed_edges_helper_anchor
+<h2>Reversed Edges Helper</h2>
+
+\image html rev_edges_helper_dlg.png
+
+\b Helper group assists you in defining <b>Reversed Edges</b>
+parameter of the hypotheses depending on edge direction.
+
+<b>Show whole geometry</b> check-box lets you see the whole
+geometrical model in the 3D Viewer. This can help you to understand
+location within the model of a set of edges shown in the Viewer.
+
+<b>Propagation chains</b> group helps you to define
+<b>Reversed Edges</b> so that opposite edges of quadrilateral faces
+will be split in the logically same direction. When this group is
+activated, the list is filled with propagation chains found within the
+model. When you select a chain in the list, edges of the chain are
+shown in the Viewer with arrows so that you can chose a common
+direction for all chain edges. \b Reverse button inverses the common
+direction of chain edges. If \b Add button is active, this means that some
+edges of a chain have different direction and you can click \b Add
+button to add such edges to <b>Reversed Edges</b> list.
+
+\image html propagation_chain.png "The whole geometry and a propagation chain"