\page blsurf_hypo_page BLSURF Parameters hypothesis
+\anchor blsurf_top
\n BLSURF Parameters hypothesis works only with <b>BLSURF</b> 2d
algorithm. This algorithm is a commercial software.
\n To get a licence, visit http://www.distene.com/corp/eval-distene.html
+<ol>
+<li>\ref blsurf_general_parameters "General parameters"</li>
+<li>\ref blsurf_advanced_parameters "Advanced parameters"</li>
+<li>\ref blsurf_local_size "Local size"</li>
+<ol>
+<li type="a">\ref blsurf_sizemap_computation "Computation of the physical size"</li>
+<li type="a">\ref blsurf_attractor "Advanced maps"</li>
+<li type="a">\ref blsurf_attractor_computation "Computation of attractors"</li>
+</ol>
+<li>\ref blsurf_enforced_elements "Enforced vertices"</li>
+<li>\ref blsurf_limitations "Limitations"</li>
+</ol>
+
+\anchor blsurf_general_parameters
<h1>General parameters</h1>
\image html blsurf_parameters.png
<li><b>Patch independent</b> - if checked, geometrical
edges are not respected and all geometrical faces are meshed as one
hyper-face.</li>
+</ul>
+
+\ref blsurf_top "Back to top"
+\anchor blsurf_advanced_parameters
<h1>Advanced parameters</h1>
The notion of <i>diag</i> used in the descriptions means the diagonal of the bounding box of the
<li>"PreCAD" is an auxiliary CAD pre-processing module which has
two main goals:
<ul>
- <li> Complete missing or inadequate CAD-description.</li>
- <li>Perform topology reconstruction and specific geometry
+ <li> Complete missing or inadequate CAD descriptions.</li>
+ <li> Perform topology reconstruction and specific geometry
enhancement for mesh generation.</li>
</ul>
This module requires a specific licence.
The following PreCAD options are the most significant and important ones:
<ul>
<li><b>Merge Edges</b> - allows PreCAD to optimize the geometry by merging some
- edges. Default is 0.</li>
+ edges. This option is 0 by default.</li>
<li><b>Remove nano edges</b> - allows PreCAD to optimize the geometry by removing
- the nano edges whenever possible. Default is 0.</li>
+ the nano edges whenever possible. This option is 0 by default.</li>
<li><b>Nano edge length</b> - gives the length below which an edge is considered as nano
for the topology processing. See also the \b remove_nano_edges option. If unset, PreCAD
default value is \f$\mathrm{diag} \times 10^{-5}\f$.</li>
<li><b>Discard input topology</b> - computes the CAD topology from scratch,
without considering the toplogical information contained in the original CAD
- (Useful for iges files). Default is 0.</li>
+ (Useful for iges files). This option is 0 by default.</li>
</ul>
</li>
</ul>
<li><b>Add option</b> - provides the choice of multiple PreCAD and BLSURF
advanced options, which appear, if selected, in a table where it is
-possible to input the value of the option and to edit it later. The PreCAD
-options are prefixed with "PRECAD_".</li>
+possible to input the value of the option and to edit it later.</li>
<li><b>Clear option</b> - removes the option selected in the table.</li>
The following PreCAD options are commonly usable.
<ul>
<li>\b closed_geometry (int) - describes whether the working geometry
-should be closed or not. When activated, this option helps PreCAD to treat
-the most dirtiest geometries. Default is 0.</li>
+should be closed or not. When activated, this option helps PreCAD to process
+the dirtiest geometries. By default this option is 0.</li>
<li>\b debug (int) - If debug = 1 PreCAD will be very verbose and will output
-some intermediate files in the working directory. Default is 0.</li>
-<li>\b eps_nano_relative (real) - Same as \b eps_nano but given in relatively to
-the diagonal of the box bounding the geometry. Default is \f$10^{-5}\f$.</li>
+some intermediate files in the working directory. By default this
+option is 0.</li>
+<li>\b eps_nano_relative (real) - the same as \b eps_nano, but relatively to
+the diagonal of the box bounding the geometry. By default this option is \f$10^{-5}\f$.</li>
<li>\b eps_sewing (real) - tolerance of the assembly. It rarely requires to be tuned.
-Default is \f$\mathrm{diag} \times 5 \cdot 10^{-4}\f$.</li>
-<li>\b eps_sewing_relative (real) - Same as \b eps_nano but given in relatively to
-the diagonal of the box bounding the geometry. Default is \f$5 \cdot 10^{-4}\f$.</li>
+By default this option is \f$\mathrm{diag} \times 5 \cdot 10^{-4}\f$.</li>
+<li>\b eps_sewing_relative (real) - the same as \b eps_nano but relatively to
+the diagonal of the box bounding the geometry. By default this option is \f$5 \cdot 10^{-4}\f$.</li>
<li>\b manifold_geometry (int) - describes whether the working geometry should be manifold or not.
-When activated, this option helps PreCAD to treat the most dirtiest geometries. Default is 0.</li>
-<li>\b create_tag_collision (int) - creates some new tags from original ones in case
-of collision (entity merge or association for example). Default is 0.</li>
-<li>\b periodic_tolerance (real) - defines the maximum distance error accepted between
-two sets of periodic entities. Default is \f$\mathrm{diag} \times 10^{-5}\f$.</li>
-<li>\b periodic_tolerance_relative (real) - Same as \b periodic_tolerance but in relative
-unit. Default is \f$10^{-5}\f$.</li>
-<li>\b periodic_split_tolerance (real) - This periodicity processing related option defines
+When activated, this option helps PreCAD to process the dirtiest
+geometries. By default this option is 0.</li>
+<li>\b create_tag_collision (int) - creates new tags from original ones in case
+of collision (entity merge or association for example). By default
+this option is 0.</li>
+<li>\b periodic_tolerance (real) - defines the maximum distance error accepted between
+two sets of periodic entities. By default this option is \f$\mathrm{diag} \times 10^{-5}\f$.</li>
+<li>\b periodic_tolerance_relative (real) - the same as \b
+periodic_tolerance but in a relative unit. Bu default this option is \f$10^{-5}\f$.</li>
+<li>\b periodic_split_tolerance (real) - This periodicity processing related option defines
the minimum distance between a CAD point and an imprinted point. It allows to indirectly
-control the number of points and small edges created. Default is \f$\mathrm{diag} \times 10^{-4}\f$.</li>
-<li>\b periodic_split_tolerance_relative (real - Same as \b periodic_split_tolerance but in
-relative unit. Default is \f$10^{-4}\f$.</li>
+control the number of created points and small edges. By default this
+option is \f$\mathrm{diag} \times 10^{-4}\f$.</li>
+<li>\b periodic_split_tolerance_relative (real - the same as \b
+periodic_split_tolerance but in a relative unit. By default this
+option is \f$10^{-4}\f$.</li>
</ul>
\n
\n\n Integer variables:
<ul>
<li> addsurf_ivertex</li>
+<li> anisotropic </li>
<li> background </li>
<li> coiter </li>
<li> communication </li>
</ul>
Real variables:
<ul>
-<li> addsurf_angle </li>
-<li> addsurf_R </li>
-<li> addsurf_H </li>
-<li> addsurf_FG </li>
-<li> addsurf_r </li>
-<li> addsurf_PA </li>
-<li> angle_compcurv </li>
-<li> angle_ridge </li>
-<li> eps_pardom </li>
+<li> addsurf_angle </li>
+<li> addsurf_R </li>
+<li> addsurf_H </li>
+<li> addsurf_FG </li>
+<li> addsurf_r </li>
+<li> addsurf_PA </li>
+<li> angle_compcurv </li>
+<li> angle_ridge </li>
+<li> anisotropic_ratio</li>
+<li> eps_pardom </li>
</ul>
String variables:
<ul>
<li> import_option </li>
</ul>
-<h1>Custom size map</h1>
+\ref blsurf_top "Back to top"
-\image html blsurf_parameters_sizemap1.png
+\anchor blsurf_local_size
+<h1>Local size</h1>
-User sizes can be defined on faces, edges or vertices.
+Local sizes can be defined on faces, edges or vertices.
<ul>
<li>The faces, edges and vertices can belong to the meshed geometrical
object or to its sub-shapes (created using <b>Explode</b> command).</li>
</ul></li>
</ul>
+3 different types of size maps can be defined:
+<ol>
+<li type="a">\ref blsurf_sizemap_computation "Computation of the physical size"</li>
+<li type="a">\ref blsurf_attractor "Advanced maps"</li>
+<li type="a">\ref blsurf_attractor_computation "Computation of attractors"</li>
+</ol>
+
+\ref blsurf_top "Back to top"
+
\anchor blsurf_sizemap_computation
<h2>Computation of the physical size</h2>
-\n
+\image html blsurf_parameters_sizemap1.png
+
The physical size is obtained by querying sizemap functions associated to the input CAD object for surfaces, curves and points.
Each function can either return a value h (which is then trimmed
between the two bounds hphymin and hphymax), or "no answer" (by not
</ul>
In order to compute the mean of several values, the arithmetic mean is used by default, but this can be modified by the parameter \ref blsurf_hmean_flag "hmean flag". In the same way, in order to interpolate two values, a linear interpolation is used by default, but this can be modified by \ref blsurf_hinterpol_flag "hinterpol flag".
+\ref blsurf_local_size "Back to \"Local size\"" \n
+\ref blsurf_top "Back to top"
+
\anchor blsurf_attractor
<h2>Advanced maps</h2>
\n
</ul>
</ul>
-\image html blsurf_attractors2.png "Example of mesh created using
-attractors, the attractors here are the side edges and the size grows
-from the side of the surface towards the apex"
-\n
-\image html blsurf_const_size_near_shape2.png "Example of size map
-with constant size option, the size is kept constant on the left side
-of the surface until a certain distance"
-\n
+\image html blsurf_const_size_near_shape2.png "Example of size map with constant size option, the size is kept constant on the left side of the surface until a certain distance"
+
Remark : The validation of the hypothesis might take a few seconds if
attractors are defined or the "constant size" option is used because a
map of distances has to be built on the whole surface for each face
<br><b>See Also</b> a sample TUI Script of the \ref tui_blsurf "creation of a BLSurf hypothesis", including size map.
+\ref blsurf_local_size "Back to \"Local size\"" \n
+\ref blsurf_top "Back to top"
+
\anchor blsurf_attractor_computation
<h2>Computation of attractors</h2>
\n
<li>R is called the distance of influence and allows controlling the growth rate of the mesh </li>
</ul>
-<h1>Custom enforced vertices</h1>
+\image html blsurf_attractors2.png "Example of mesh created using attractors, the attractors here are the side edges and the size grows from the side of the surface towards the apex"
+
+\ref blsurf_local_size "Back to \"Local size\"" \n
+\ref blsurf_top "Back to top"
+
+\anchor blsurf_enforced_elements
+<h1>Enforced vertices</h1>
\image html blsurf_parameters_enforced_vertices.png
-It is possible to define some enforced vertices to BLSurf algorithm
-without creating any vertices by CAD algorithms.
+It is possible to define some enforced vertices to BLSurf algorithm.
+An enforced vertex is defined on a Face or a Compound by
+<ul>
+<li> selecting an existing Vertex or Compound,</li>
+<li> or creating a new vertex given its coordinates.</li>
+</ul>
+The enforced vertex is the projection of a point defined by its
+(x,y,z) coordinates on the selected face.
<ul>
-<li>The enforced vertex is the projection of a point defined by its
-(x,y,z) coordinates on the selected face.</li>
<li>It is possible to define several enforced vertices on a face or a group of faces.</li>
<li>If the projected point is on the boundary or outside of the face, it will be ignored.</li>
+<li>If a group name is specified, the enforced nodes will be added in the group. If the group does not exist it will be created.
</ul>
+You can specify BLSURF to use the internal vertices of the faces as enforced vertices by checking <i>Use internal vertices of all faces</i>.
+If a group name is specified, the internal enforced nodes will be added in the group. If the group does not exist it will be created.
+
<br><b>See Also</b> a sample TUI Script of the \ref tui_blsurf "creation of a BLSurf hypothesis", including enforced vertices.
+\ref blsurf_top "Back to top"
+
+\anchor blsurf_limitations
<h1>Limitations</h1>
Currently BLSURF plugin has the following limitations.
</li>
</ul>
+\ref blsurf_top "Back to top"
+
*/
