+\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 hypothesis</h2>
+
+<b>Fixed Points</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 in
+defining <b>Reversed Edges</b> parameter.
+
+
+\image html mesh_fixedpnt.png "Example of a sub-mesh on the edge built using Fixed Points 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 in defining <b>Reversed Edges</b>
+parameter of the hypotheses depending on edge direction.
+
+<b>Show whole geometry</b> check-box allows seeing the whole
+geometrical model in the 3D Viewer, which can help to understand the
+location of a set of edges within the model.
+
+<b>Propagation chains</b> group allows defining <b>Reversed Edges</b>
+for splitting opposite edges of quadrilateral faces in a logically
+uniform direction. When this group is activated, the list is filled
+with propagation chains found within the shape on which a hypothesis
+is assigned. When a chain is selected in the list its edges are shown
+in the Viewer with arrows, which enables choosing a common direction
+for all chain edges. \b Reverse button inverts the common direction of
+chain edges. \b Add button is active if some edges of a chain have a
+different direction, so you can click \b Add button to add them
+to <b>Reversed Edges</b> list.
+
+\image html propagation_chain.png "The whole geometry and a propagation chain"
+
+\note Alternatively, uniform direction of edges of one propagation
+chain can be achieved by
+\ref constructing_submeshes_page "definition of a sub-mesh" on one
+edge of the chain and assigning a
+\ref propagation_anchor "Propagation" additional hypothesis.
+Orientation of this edge (and hence of all the rest edges of the chain) can be
+controlled by using <b>Reversed Edges</b> field.