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/*=========================================================================
Program: Visualization Toolkit
Module: vtkPolyDataPointSampler.h
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
// .NAME vtkPolyDataPointSampler - generate points from vtkPolyData
// .SECTION Description
// vtkPolyDataPointSampler generates points from input vtkPolyData. The
// points are placed approximately a specified distance apart.
//
// This filter functions as follows. First, it regurgitates all input points,
// then samples all lines, plus edges associated with the input polygons and
// triangle strips to produce edge points. Finally, the interiors of polygons
// and triangle strips are subsampled to produce points. All of these
// functiona can be enabled or disabled separately. Note that this algorithm
// only approximately generates points the specified distance apart.
// Generally the point density is finer than requested.
//
// .SECTION Caveats
// Point generation can be useful in a variety of applications. For example,
// generating seed points for glyphing or streamline generation. Another
// useful application is generating points for implicit modeling. In many
// cases implicit models can be more efficiently generated from points than
// from polygons or other primitives.
// .SECTION See Also
// vtkImplicitModeller
#ifndef __vtkPolyDataPointSampler_h
#define __vtkPolyDataPointSampler_h
#include "vtkPolyDataAlgorithm.h"
class VTK_GRAPHICS_EXPORT vtkPolyDataPointSampler : public vtkPolyDataAlgorithm
{
public:
// Description:
// Instantiate this class.
static vtkPolyDataPointSampler *New();
// Description:
// Standard macros for type information and printing.
vtkTypeMacro(vtkPolyDataPointSampler,vtkPolyDataAlgorithm);
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Set/Get the approximate distance between points. This is an absolute
// distance measure. The default is 0.01.
vtkSetClampMacro(Distance,double,0.0,VTK_LARGE_FLOAT);
vtkGetMacro(Distance,double);
// Description:
// Specify/retrieve a boolean flag indicating whether cell vertex points should
// be output.
vtkGetMacro(GenerateVertexPoints,int);
vtkSetMacro(GenerateVertexPoints,int);
vtkBooleanMacro(GenerateVertexPoints,int);
// Description:
// Specify/retrieve a boolean flag indicating whether cell edges should
// be sampled to produce output points. The default is true.
vtkGetMacro(GenerateEdgePoints,int);
vtkSetMacro(GenerateEdgePoints,int);
vtkBooleanMacro(GenerateEdgePoints,int);
// Description:
// Specify/retrieve a boolean flag indicating whether cell interiors should
// be sampled to produce output points. The default is true.
vtkGetMacro(GenerateInteriorPoints,int);
vtkSetMacro(GenerateInteriorPoints,int);
vtkBooleanMacro(GenerateInteriorPoints,int);
// Description:
// Specify/retrieve a boolean flag indicating whether cell vertices should
// be generated. Cell vertices are useful if you actually want to display
// the points (that is, for each point generated, a vertex is generated).
// Recall that VTK only renders vertices and not points.
// The default is true.
vtkGetMacro(GenerateVertices,int);
vtkSetMacro(GenerateVertices,int);
vtkBooleanMacro(GenerateVertices,int);
protected:
vtkPolyDataPointSampler();
~vtkPolyDataPointSampler() {}
int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);
double Distance;
double Distance2;
int GenerateVertexPoints;
int GenerateEdgePoints;
int GenerateInteriorPoints;
int GenerateVertices;
void SampleEdge(vtkPoints *pts, double x0[3], double x1[3]);
void SampleTriangle(vtkPoints *newPts, vtkPoints *inPts,
vtkIdType *pts);
void SamplePolygon(vtkPoints *newPts, vtkPoints *inPts,
vtkIdType npts, vtkIdType *pts);
private:
vtkPolyDataPointSampler(const vtkPolyDataPointSampler&); // Not implemented.
void operator=(const vtkPolyDataPointSampler&); // Not implemented.
};
#endif
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