264 lines
9.3 KiB
C
264 lines
9.3 KiB
C
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/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkStaticCleanPolyData.h
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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/**
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* @class vtkStaticCleanPolyData
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* @brief merge duplicate points, and/or remove unused points and/or remove degenerate cells
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*
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* vtkStaticCleanPolyData is a filter that takes polygonal data as input and
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* generates polygonal data as output. vtkStaticCleanPolyData will merge
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* duplicate points (within specified tolerance), and if enabled, transform
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* degenerate cells into appropriate forms (for example, a triangle is
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* converted into a line if two points of triangle are merged).
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*
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* Conversion of degenerate cells is controlled by the flags
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* ConvertLinesToPoints, ConvertPolysToLines, ConvertStripsToPolys which act
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* cumulatively such that a degenerate strip may become a poly.
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* The full set is
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* Line with 1 points -> Vert (if ConvertLinesToPoints)
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* Poly with 2 points -> Line (if ConvertPolysToLines)
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* Poly with 1 points -> Vert (if ConvertPolysToLines && ConvertLinesToPoints)
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* Strp with 3 points -> Poly (if ConvertStripsToPolys)
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* Strp with 2 points -> Line (if ConvertStripsToPolys && ConvertPolysToLines)
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* Strp with 1 points -> Vert (if ConvertStripsToPolys && ConvertPolysToLines
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* && ConvertLinesToPoints)
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*
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* Internally this class uses vtkStaticPointLocator, which is a threaded, and
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* much faster locator (especially for large data) than the incremental
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* locators that vtkCleanPolyData uses. Note because of these and other
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* differences, the output of this filter may be different than
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* vtkCleanPolyData.
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*
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* @warning
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* Merging points can alter topology, including introducing non-manifold
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* forms. The tolerance should be chosen carefully to avoid these problems.
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* Large tolerances (of size > locator bin width) may generate poor results.
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*
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* @warning
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* Unlike vtkCleanPolyData, point merging is always performed (i.e., there
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* is no PointMergingOff()).
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*
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* @warning
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* Unlike vtkCleanPolyData, conversion from one cell type to another is
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* disabled/off. This produces more predictable behavior in many applications.
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*
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* @warning
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* The vtkStaticCleanPolyData filter is similar in operation to
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* vtkCleanPolyData. However, vtkStaticCleanPolyData is non-incremental and
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* uses a much faster (especially for larger datasets) threading approach and
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* when merging points with a non-zero tolerance. However because of the
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* difference in the traveral order in the point merging process, the output
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* of the filters may be different.
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*
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* @warning
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* This class has been threaded with vtkSMPTools. Using TBB or other
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* non-sequential type (set in the CMake variable
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* VTK_SMP_IMPLEMENTATION_TYPE) may improve performance significantly.
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*
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* @sa
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* vtkCleanPolyData vtkStaticCleanUnstructuredGrid
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*/
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#ifndef vtkStaticCleanPolyData_h
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#define vtkStaticCleanPolyData_h
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#include "vtkFiltersCoreModule.h" // For export macro
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#include "vtkPolyDataAlgorithm.h"
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#include "vtkStaticPointLocator.h" // For enums
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class VTKFILTERSCORE_EXPORT vtkStaticCleanPolyData : public vtkPolyDataAlgorithm
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{
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public:
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///@{
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/**
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* Standard methods to instantiate, print, and provide type information.
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*/
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static vtkStaticCleanPolyData* New();
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void PrintSelf(ostream& os, vtkIndent indent) override;
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vtkTypeMacro(vtkStaticCleanPolyData, vtkPolyDataAlgorithm);
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///@}
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///@{
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/**
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* By default ToleranceIsAbsolute is false and Tolerance is
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* a fraction of Bounding box diagonal, if true, AbsoluteTolerance is
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* used when adding points to locator (merging)
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*/
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vtkSetMacro(ToleranceIsAbsolute, bool);
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vtkBooleanMacro(ToleranceIsAbsolute, bool);
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vtkGetMacro(ToleranceIsAbsolute, bool);
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///@}
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///@{
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/**
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* Specify tolerance in terms of fraction of bounding box length. Default
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* is 0.0. This takes effect only if ToleranceIsAbsolute is false.
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*/
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vtkSetClampMacro(Tolerance, double, 0.0, 1.0);
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vtkGetMacro(Tolerance, double);
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///@}
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///@{
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/**
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* Specify tolerance in absolute terms. Default is 1.0.
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*/
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vtkSetClampMacro(AbsoluteTolerance, double, 0.0, VTK_DOUBLE_MAX);
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vtkGetMacro(AbsoluteTolerance, double);
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///@}
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///@{
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/**
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* Specify the name of a point data array associated with the point merging
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* process. If a data array is specified, and exists in the input point
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* data, then point merging will switch into a mode where merged points
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* must be both geometrically coincident and have matching point data
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* (i.e., an exact match of position and data - tolerances have no
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* effect). Note that the number of tuples in the merging data array must
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* be equal to the number of points in the input. By default, no data array
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* is associated with the input points (i.e., the name of the data array is
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* empty).
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*/
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vtkSetStringMacro(MergingArray);
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vtkGetStringMacro(MergingArray);
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///@}
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///@{
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/**
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* Turn on/off conversion of degenerate lines to points. Default is Off.
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*/
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vtkSetMacro(ConvertLinesToPoints, bool);
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vtkBooleanMacro(ConvertLinesToPoints, bool);
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vtkGetMacro(ConvertLinesToPoints, bool);
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///@}
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///@{
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/**
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* Turn on/off conversion of degenerate polys to lines. Default is Off.
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*/
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vtkSetMacro(ConvertPolysToLines, bool);
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vtkBooleanMacro(ConvertPolysToLines, bool);
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vtkGetMacro(ConvertPolysToLines, bool);
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///@}
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///@{
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/**
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* Turn on/off conversion of degenerate strips to polys. Default is Off.
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*/
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vtkSetMacro(ConvertStripsToPolys, bool);
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vtkBooleanMacro(ConvertStripsToPolys, bool);
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vtkGetMacro(ConvertStripsToPolys, bool);
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///@}
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///@{
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/**
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* Indicate whether points unused by any cell are removed from the output.
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* By default this point removal is on. Note that when this is off, the
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* filter can successfully process datasets with no cells (and just
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* points). If on, and there are no cells, than the output will be empty.
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*/
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vtkSetMacro(RemoveUnusedPoints, bool);
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vtkBooleanMacro(RemoveUnusedPoints, bool);
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vtkGetMacro(RemoveUnusedPoints, bool);
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///@}
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///@{
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/**
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* Indicate whether a merge map should be produced on output. The merge
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* map, if requested, maps each input point to its output point id, or
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* provides a value of -1 if the input point is not used in the output.
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* The merge map is associated with the filter's output field data and
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* is named "PointMergeMap". By default, ProduceMergeMap is disabled.
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*/
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vtkSetMacro(ProduceMergeMap, bool);
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vtkBooleanMacro(ProduceMergeMap, bool);
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vtkGetMacro(ProduceMergeMap, bool);
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///@}
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///@{
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/**
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* Indicate whether point coordinates and point data of merged points are
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* averaged. By default, the point coordinates and attribute data are not
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* averaged, and the point coordinate and data of the single, remaining
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* merged point is retained. Otherwise, the data coordinates and attribute
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* values of all merged points are averaged. By default this feature is
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* disabled.
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*/
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vtkSetMacro(AveragePointData, bool);
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vtkBooleanMacro(AveragePointData, bool);
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vtkGetMacro(AveragePointData, bool);
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///@}
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///@{
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/**
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* Set/get the desired precision for the output types. See the documentation
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* for the vtkAlgorithm::DesiredOutputPrecision enum for an explanation of
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* the available precision settings.
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*/
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vtkSetMacro(OutputPointsPrecision, int);
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vtkGetMacro(OutputPointsPrecision, int);
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///@}
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/**
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* Retrieve the internal locator to manually configure it, for example
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* specifying the number of points per bucket, or controlling the traversal
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* order. This method is generally used for debugging or testing purposes.
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*/
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vtkGetObjectMacro(Locator, vtkStaticPointLocator);
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///@{
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// This filter is difficult to stream. To produce invariant results, the
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// whole input must be processed at once. This flag allows the user to
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// select whether strict piece invariance is required. By default it is
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// on. When off, the filter can stream, but results may change.
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vtkSetMacro(PieceInvariant, bool);
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vtkGetMacro(PieceInvariant, bool);
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vtkBooleanMacro(PieceInvariant, bool);
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///@}
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/**
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* Get the MTime of this object also considering the locator.
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*/
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vtkMTimeType GetMTime() override;
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protected:
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vtkStaticCleanPolyData();
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~vtkStaticCleanPolyData() override = default;
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// Usual data generation method
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int RequestData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) override;
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int RequestUpdateExtent(vtkInformation*, vtkInformationVector**, vtkInformationVector*) override;
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double Tolerance;
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double AbsoluteTolerance;
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char* MergingArray;
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bool ConvertLinesToPoints;
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bool ConvertPolysToLines;
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bool ConvertStripsToPolys;
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bool ToleranceIsAbsolute;
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bool RemoveUnusedPoints;
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bool ProduceMergeMap;
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bool AveragePointData;
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int OutputPointsPrecision;
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bool PieceInvariant;
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// Internal locator for performing point merging
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vtkSmartPointer<vtkStaticPointLocator> Locator;
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private:
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vtkStaticCleanPolyData(const vtkStaticCleanPolyData&) = delete;
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void operator=(const vtkStaticCleanPolyData&) = delete;
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};
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#endif
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