The new algorithm provides robust quality triangulations of non-convex
polygons. It also produces a best attempt for polygons that are badly
warped or self intersecting by minimising the area in which the local
normal is in the opposite direction to the overal polygon normal. It is
memory efficient when applied to multiple polygons as it maintains and
reuses its workspace.
This algorithm replaces implementations in the face and
faceTriangulation classes, which have been removed.
Faces can no longer be decomposed into mixtures of tris and
quadrilaterals. Polygonal faces with more than 4 sides are now
decomposed into triangles in foamToVTK and in paraFoam.
The FOAM file format has not changed from version 2.0 in many years and so there
is no longer a need for the 'version' entry in the FoamFile header to be
required and to reduce unnecessary clutter it is now optional, defaulting to the
current file format 2.0.
The writer class has been renamed setWriter in order to clarify its
usage. The coordSet and setWriter classes have been moved into the
sampling library, as this fits their usage.
The new write functions are currently being utilised by setSet and the
vtkSurfaceWriter, but it should eventually be possible for more examples
of VTK poly data writing to be converted to use these functions.
This new constraint type is preferable to the 'empty' type used previously as it
support patch field values for post-processing and other purposes.
The internalFvPatchField operates as a 'zeroGradient' type so that the adjacent
cell values are displayed on the faces exposed by the sub-setting.
The internalFvsPatchField operates as a 'calculated' type so that the internal
face values are displayed on the faces exposed by the sub-setting.
The immediate benefit of this change can be seen when using 'subsetMesh' without
the '-noFields' option to create and write a sub-set of an 'fvMesh' with field
values, now the face values of the 'exposed' internal faces can be visualised.
The "full" filtering option in isoSurface now no longer attempts to
remove non-manifold faces. As a result, this filtering level is now
robust, but it may leave small imperfections in the surface. This has
been reinstated as the default filtering level as it has advantageous
properties over "partial" filtering in both smoothness of visualisation
and in the size of the files it generates.
A new "clean" level has been added, which does try and remove
imperfections. This is equivalent to the previous operation of the
"full" option. This is not guaranteed to be robust. In certain
configurations the removal process can propagate and delete an entire
section of the surface.
The "full" filtering option has been found not to be sufficiently
robust. It erroneously removes entire contiguous sections of the
iso-surface in a number of situations. Full filtering can still be
enabled by specifying "filtering full;" in the relevant dictionary.
Originally the only supported geometry specification were triangulated surfaces,
hence the name of the directory: constant/triSurface, however now that other
surface specifications are supported and provided it is much more logical that
the directory is named accordingly: constant/geometry. All tutorial and
template cases have been updated.
Note that backward compatibility is provided such that if the constant/geometry
directory does not exist but constant/triSurface does then the geometry files
are read from there.
It is more logical to use wordRe rather than keyType for name-based selection
including regular expression support as keyType now support other forms of
dictionary keyword including function and variable names which are not
relevant for selecting zones by name.
The patch triangulation done as part of this set construction is now
done using polyMeshTetDecomposition. This has simplified the
implementation and permitted the addition of a small tolerance to move
the points within the mesh bounds, resulting in the removal of a number
of warning messages.
e.g. in tutorials/incompressible/pisoFoam/LES/motorBike/motorBike/system/cuttingPlane
surfaceFormat vtk;
writeFormat binary;
fields (p U);
selects writing the VTK surface files in binary format which significantly
speeds-up reading of the files in paraview.
Currently binary writing is supported in VTK and EnSight formats.
Added sets for sampling the cell-centres and face-centres of a cellSet
or faceSet. Example usage:
sets
(
c0
{
type cellSet;
set c0;
axis xyz;
}
f0
{
type faceSet;
set f0;
axis xyz;
}
);
The filtering level for an iso-surface can now be selected. The keyword
is "filtering", and the options are "full", "partial" or "none". The
default is "full". The other options are only retained for debugging and
to provide a fallback if robustness of the full filtering algorithm is
an issue. As of commit 2ee8b7ac, "full" filtering has no known
disadvantages and is recommended in all usage cases.
This setting replaces the "regularise" entry, which switched between
what are now the "full" and "none" settings. "partial" was not
previously an option.
This is a slight rework of commit c81abfef. Instead of adapting tet
base points cell-by-cell, the dangling points are pre-computed and then
the adaptations to the base points are made face-by-face. This correctly
adapts faces which have different dangling points relative to the owner
and neighbour cells.
and copy assignment operator for classes with a copy constructor
This is often described as the rule of 3 (or rule of 5 in C++11 if move
constructors and assignment operators are also defined) and makes good sense in
ensuring consistency. For classes in which the default bitwise copy constructor
or assignment operator are appropriate these are now specified explicitly using
the "= default" keyword if the other is explicitly defined fulfilling the rule
of 3 without the need to define the body of the function.
