\page netgen_2d_3d_hypo_page NETGEN 2D and 3D hypotheses
-<b>NETGEN 2D Parameters</b> and <b>NETGEN 3D Parameters</b> hypotheses work only with
-<b>NETGEN 1D-2D</b>, <b>NETGEN 2D</b>, <b>NETGEN 1D-2D-3D</b> and
-<b>NETGEN 3D</b> algorithms. <b>NETGEN 1D-2D</b> and <b>NETGEN
-1D-2D-3D</b> algorithms do not require definition of lower-level
-hypotheses and algorithms (2D and 1D for meshing 3D objects and 1D for
-meshing 2D objects).
+<b>NETGEN 2D Parameters</b> and <b>NETGEN 3D Parameters</b>
+hypotheses work only with NETGEN algorithm in it's different forms:
+- <b>NETGEN 1D-2D</b>
+- <b>NETGEN 2D</b>
+- <b>NETGEN 1D-2D-3D</b>
+- <b>NETGEN 3D</b>.
-\image html netgen2d3d.png
-<center><em>Hypothesis dialog boxes of <b>NETGEN 1D-2D</b> and <b>NETGEN
- 1D-2D-3D</b> algorithms are same</em></center>
-<br>
+<b>NETGEN 1D-2D</b> and <b>NETGEN 1D-2D-3D</b> algorithms do not
+ require definition of lower-level hypotheses and algorithms (2D and
+ 1D for meshing 3D objects and 1D for meshing 2D objects).
-\image html netgen2d3d_only.png
-<center><em>Dialog boxes of <b>NETGEN 2D</b> and <b>NETGEN 3D</b>
- algorithms </em></center>
-<br>
-\image html netgen2d_remesher.png
-<center><em>Hypothesis dialog box of <b>NETGEN 2D</b> remesher algorithms</em></center>
+<b>NETGEN 1D-2D-3D</b> algorithm has maximal number of options. The
+rest forms have less options as they construct elements of less number
+of dimensions. All options are distributed among following tabs:
+- \ref arguments_anchor "Arguments" - basic options.
+- \ref local_sizes_anchor "Local Sizes" - local element size.
+- \ref advanced_anchor "Advanced" - advanced options.
+- \ref stl_anchor "STL" - specific Remesher options.
+
+\ref simple_anchor "NETGEN 2D/3D simple parameters" hypotheses allow
+defining the size of elements for each dimension separately.
+\anchor arguments_anchor
+<h2> Arguments tab</h2>
+
+<b>Arguments</b> tab defines basic mesh parameters.
+
+\image html netgen2d3d.png
+<center><em>Main tab of hypothesis dialog box <b>NETGEN 1D-2D-3D</b> algorithm</em></center>
+<br>
+
- <b>Name</b> - allows to define the name for the algorithm (NETGEN
2D (or 3D) Parameters by default).
- <b>Max Size</b> - maximum linear dimensions for mesh cells.
- <b>Min Size</b> - minimum linear dimensions for mesh cells. It is
ignored if it is more than <b>Max Size</b>.
-- <b>Second Order</b> - if this box is checked in, the algorithm will
-create second order mesh.
- <b>Fineness</b> - ranging from <em>Very Coarse</em> to <em>Very Fine</em>
allows to set the level of meshing detalization using the three
parameters below. You can select \a Custom to define them manually.
into account.) If this box is not checked in, then size of elements is
defined by three parameters only:
<b>Max Size</b>, <b>Min Size</b> and <b>Growth rate</b>.
-- <b>Allow Quadrangles</b> - if this box is checked in, the mesher
+- <b>Quad-dominated</b> - if this box is checked in, the mesher
tries to generate quadrangle 2D mesh. Triangle elements are created
where quadrangles are not possible.
+- <b>Second Order</b> - if this box is checked in, the algorithm will
+create second order mesh.
- <b>Optimize</b> - if this box is checked in, the algorithm will modify
initially created mesh in order to improve quality of elements. Optimization
-process is rather time consuming comparing to creation of initial mesh.
-- <b>Fuse Coincident Nodes on Edges and Vertices</b> - allows merging
-mesh nodes on vertices and edges which are geometrically coincident
-but are topologically different.
-- <b>Ridge angle</b> - allows to define minimum angle in degrees between
-normals of adjacent triangles at which the remesher (Netgen 2D working
-w/o geometry) considers the edge between these triangles as a feature edge.
+process is rather time consuming comparing to creation of initial
+mesh.
+
+Remesher has two additional basic options:
+- <b>Keep existing edges</b> - if activated, all edges present in the
+initial mesh are kept and used to separate STL surfaces.
+- <b>Create groups of surfaces </b> if activated, all new surface
+elements are distributed among groups corresponding to STL surfaces
+the Remesher detects.
+
+
+\anchor local_sizes_anchor
+<h2> Local sizes tab</h2>
+
+<b>Local sizes</b> tab allows to define size of elements on and
+around specified geometrical objects.
\image html netgen3d_local_size.png
-- <b>Local sizes</b> - allows to define size of elements on and
-around specified geometrical objects. To define the local
+- To define the local
size it is necessary to select a geometrical objects in the
object browser or in the viewer, and to click a button corresponding
to the type of the geometrical objects: <b>On Vertex</b>, <b>On
25, 0) and (25, 25, 200) size of elements should be 0.3.
-\image html netgen2d3d_simple.png
+
+\anchor advanced_anchor
+<h2> Advanced tab</h2>
+
+<b>Advanced</b> tab allows advance controlling meshing algorithm.
+
+\image html netgen_advanced.png
+
+- <b>Element size weight</b> - weight of triangle size badness with respect to
+triangle shape badness. Total triangle badness is evaluated as <em>
+ shape_badness + size_weight * size_mismatch</em>.
+- <b>Nb. surface optimization steps</b> - number of loops when optimizing surface mesh.
+- <b>Nb. volume optimization steps</b> - number of loops when optimizing volume mesh.
+- <b>Worst element measure</b> - power of error, used to approximate max error optimization.
+- <b>Use Delaunay</b> - if activated, use Delaunay approach to
+construct volume elements, otherwise use Advancing front method.
+- <b>Check overlapping</b> - check overlapping surfaces during surface meshing.
+- <b>Check chart boundary</b> - to check chart boundary.
+- <b>Fuse Coincident Nodes on Edges and Vertices</b> - allows merging
+mesh nodes on vertices and edges which are geometrically coincident
+but are topologically different.
+
+
+
+\anchor stl_anchor
+<h2> STL tab</h2>
+
+<b> STL </b> tab holds option of Remesher (NETGEN 2D working w/o geometry).
+
+\image html netgen2d_remesher.png
+<center><em>Options specific to <b>NETGEN 2D</b> remesher algorithms</em></center>
+
+
+- <b>Ridge angle</b> - defines minimum angle in degrees between
+normals of adjacent triangles at which the remesher considers the edge
+between these triangles as a feature edge. Feature edges bound charts
+of triangles that are re-meshed as separate surfaces.
+- <b> Edge corner angle </b> - defines minimum angle in degrees
+between adjacent edges of chart boundary, above which a point shared
+by the edges is considered as an end point of chart boundary curve.
+- <b> Chart angle </b> - angle between normals of adjacent triangles
+under which a shared sharp edge is <em>not</em> considered as chart boundary,
+provided that this edge is not classified as chart boundary due
+to <b>Ridge angle</b> and <b>Keep existing edges</b> options.
+- <b> Outer chart angle </b> - angle for overlapping parts of chart.
+- <b> Chart distance </b> - defines a factor used to limit element
+size by distance to neighbor chart.
+- <b> Line length </b> - defines a factor used to limit size
+of elements located near ends of chart boundary curves by length of a
+chart boundary curve.
+- <b> Close edges </b> - defines a factor used to limit size
+of elements located near chart boundary curves by distance to other
+chart boundary curves.
+- <b> Surface curvature </b> - defines a factor used to limit size
+of elements by surface curvature.
+- <b> Edge angle </b> - defines a factor used to limit size
+of elements by chart boundary curve curvature.
+- <b> Surface mesh curvature</b> - defines a number of elements per
+curvature radius.
+
+\anchor simple_anchor
+<h2> NETGEN 2D/3D simple parameters</h2>
<b>NETGEN 2D simple parameters</b> and <b>NETGEN 3D simple
-parameters</b> allow defining the size of elements for each
+parameters</b> hypotheses allow defining the size of elements for each
dimension.
+\image html netgen2d3d_simple.png
+
\b 1D group allows defining the size of 1D elements in either of two ways:
- <b>Number of Segments</b> allows specifying number of segments, that
will split each edge, with equidistant distribution.
