<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>
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>
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