<b>Base vertex</b> parameter allows using Quadrangle (Mapping)
algorithm for meshing of triangular faces. In this case it is
-necessary to select a vertex, which will be used as the fourth edge
+necessary to select the vertex, which will be used as the fourth edge
(degenerated).
\image html hypo_quad_params_1.png "A face built from 3 edges"
\image html hypo_quad_params_res_2.png "The resulting meshes"
-<b>Type</b> parameter has sense on faces with different number of
-segments on opposite sides. The following types are available:
+<b>Type</b> parameter is used on faces with a different number of
+segments on opposite sides to define the algorithm of transition
+between them. The following types are available:
<ul>
-<li><b>Standard</b> means the default case, triangles and quadrangles
- are possible along the longest sides (in the refinement area).</li>
+<li><b>Standard</b> is the default case, when both triangles and quadrangles
+ are possible in the transition area along the finer meshed sides.</li>
<li><b>Triangle preference</b> forces building only triangles in the
- refinement area for transition to higher number of segments.
+ transition area along the finer meshed sides.
<i>This type corresponds to <b>Triangle Preference</b> additional
hypothesis, which is obsolete now.</i></li>
-<li><b>Quadrangle preference</b> forces building only quadrangles for
- transition to higher number of segments. This hypothesis has one
- restriction on its work: the total quantity of segments on all
+<li><b>Quadrangle preference</b> forces building only quadrangles in the
+ transition area along the finer meshed sides. This hypothesis has a
+ restriction: the total quantity of segments on all
four sides of the face must be even (divisible by 2).</li>
<i>This type corresponds to <b>Quadrangle Preference</b>
additional hypothesis, which is obsolete now.</i></li>
-<li><b>Quadrangle preference (reversed)</b> works like
- <b>Quadrangle preference</b> (and with same restriction), but
- transition is made near the sides with smaller number of
- segments.</li>
-<li><b>Reduced</b> type forces building only quadrangles, transition
- to other number of segments is made layer by layer. This type has
- a limitation on number of segments: two opposite edges must have
- the same number of segments, two another must have even difference
- between their numbers of segments.</li>
+<li><b>Quadrangle preference (reversed)</b> works in the same way and
+with the same restriction as <b>Quadrangle preference</b>, but
+ the transition area is located along the coarser meshed sides.</li>
+<li><b>Reduced</b> type forces building only quadrangles and the transition
+ between the sides is made gradually, layer by layer. This type has
+ a limitation on the number of segments: one pair of opposite sides must have
+ the same number of segments, the other pair must have an even difference
+ between the numbers of segments on the sides.</li>
</ul>
<b>See Also</b> a sample TUI Script of a
