-<li>Hexahedron meshing algorithm (i,j,k) - Volumes are split into
-hexahedral (cubic) elements.</li>
-<li>Tetrahedron (Netgen and GHS3D) meshing algorithms - Volumes are split into
-tetrahedral (pyramidal) elements.</li>
+<li><b>Hexahedron (i,j,k)</b> meshing algorithm - solids are
+ split into hexahedral elements thus forming a structured 3D
+ mesh. The algorithm requires that 2D mesh generated on a solid could
+ be considered as a mesh of a box, i.e. there should be eight nodes
+ shared by three quadrangles and the rest nodes should be shared by
+ four quadrangles.
+\image html hexa_ijk_mesh.png "Structured mesh generated by Hexahedron (i,j,k) on a solid bound by 16 faces"
+</li>
+
+<li>\subpage cartesian_algo_page "Body Fitting" meshing
+ algorithm - solids are split into hexahedral elements forming
+ a Cartesian grid; polyhedra and other types of elements are generated
+ where the geometrical boundary intersects Cartesian cells.</li>