\image html projection_1d.png
-In this menu you can define the \b Name of the algorithm, the already
-meshed source \b Edge and the \b 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 edges,
-which is done by indicating the <b>Source Vertex</b> being the first point
-of the Source Edge and the <b>Target Vertex</b> being the first point of
-the created \b Edge.
+In this dialog you can define
+<ul>
+ <li> the \b Name of the algorithm,</li>
+ <li> the already meshed <b> Source Edge</b> and </li>
+ <li> the <b>Source Mesh </b> (It can be omitted only when projecting
+ a sub-mesh on another one of the same Mesh).</li>
+ <li> It could also be necessary to define the orientation of edges,
+ which is done by indicating the <b>Source Vertex</b> being the
+ first point of the <b>Source Edge </b>and the <b>Target Vertex</b> being
+ the first point of the edge being meshed.</li>
+</ul>
+<br>
For a group of edges, <b>Source</b> and <b>Target</b> vertices should be
-shared by only one edge of the group. If <b>Source</b> and
-<b>Target</b> vertices are specified, the elements of the group must be ajacent.
+shared by only one edge of the group. If <b>Source</b> and <b>Target</b>
+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.
\n <b>Projection 2D</b> 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 meshed as 1D Projections of
-the edges of the source 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 \b Geometry of <b>Create mesh</b> dialog box), <b>Projection
-2D</b> in the list
-of 2D algorithms and click the <em>"Add Hypothesis"</em> button. The
-following dialog box will appear:
+2D</b> in the list of 2D algorithms and click the <em> "Add
+Hypothesis"</em> button. The following dialog box will appear:
\image html projection_2d.png
-In this menu you can define the \b Name of the algorithm, the already
-meshed source \b Face and the \b 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 face
-, which is done by indicating two <b>Source Vertices</b>, which belong
-to the same edge of the source face, and two <b>Target Vertices</b>, which
-belong to the same edge of the created \b Face.
+In this dialog you can define
+<ul>
+ <li> the \b Name of the algorithm, </li>
+ <li> the already meshed <b> Source Face </b> and </li>
+ <li> the <b> Source Mesh </b> (It can be omitted only when
+ projecting a submesh on another one of the same Mesh). </li>
+ <li> It could also be necessary to define the orientation of mesh on
+ the face, which is done by indicating two <b>Source Vertices</b>,
+ which belong to the same edge of the <b>Source Face</b>, and
+ two <b>Target Vertices</b>, which belong to the same edge of the
+ face being meshed.</li>
+</ul>
+For groups of face, the groups must contain equal number of faces and
+they must form topologically equal structures.
+
+\n <b>Projection 1D-2D</b> algorithm differs from <b>Projection 2D</b>
+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.
\n <b>Projection 3D</b> algorithm allows to define the mesh of a shape by
the projection of another already meshed shape. This algorithm works
