dox/Graphics/vtkDelaunay3D.h

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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkDelaunay3D.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.

=========================================================================*/
#ifndef __vtkDelaunay3D_h
#define __vtkDelaunay3D_h

#include "vtkUnstructuredGridAlgorithm.h"

class vtkIdList;
class vtkPointLocator;
class vtkPointSet;
class vtkPoints;
class vtkTetraArray;
class vtkIncrementalPointLocator;

class VTK_GRAPHICS_EXPORT vtkDelaunay3D : public vtkUnstructuredGridAlgorithm
{
public:
  vtkTypeMacro(vtkDelaunay3D,vtkUnstructuredGridAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);

  static vtkDelaunay3D *New();


  vtkSetClampMacro(Alpha,double,0.0,VTK_DOUBLE_MAX);
  vtkGetMacro(Alpha,double);


  vtkSetClampMacro(Tolerance,double,0.0,1.0);
  vtkGetMacro(Tolerance,double);


  vtkSetClampMacro(Offset,double,2.5,VTK_DOUBLE_MAX);
  vtkGetMacro(Offset,double);


  vtkSetMacro(BoundingTriangulation,int);
  vtkGetMacro(BoundingTriangulation,int);
  vtkBooleanMacro(BoundingTriangulation,int);


  void SetLocator(vtkIncrementalPointLocator *locator);
  vtkGetObjectMacro(Locator,vtkIncrementalPointLocator);

  void CreateDefaultLocator();


  vtkUnstructuredGrid *InitPointInsertion(double center[3], double length, 
                                          vtkIdType numPts, vtkPoints* &pts);


  void InsertPoint(vtkUnstructuredGrid *Mesh, vtkPoints *points,
                   vtkIdType id, double x[3], vtkIdList *holeTetras);

  void EndPointInsertion();

  unsigned long GetMTime();

protected:
  vtkDelaunay3D();
  ~vtkDelaunay3D();

  int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);

  double Alpha;
  double Tolerance;
  int BoundingTriangulation;
  double Offset;

  vtkIncrementalPointLocator *Locator;  //help locate points faster
  
  vtkTetraArray *TetraArray; //used to keep track of circumspheres/neighbors
  int FindTetra(vtkUnstructuredGrid *Mesh, double x[3], vtkIdType tetId,
                int depth);
  int InSphere(double x[3], vtkIdType tetraId);
  void InsertTetra(vtkUnstructuredGrid *Mesh, vtkPoints *pts,
                   vtkIdType tetraId);

  int NumberOfDuplicatePoints; //keep track of bad data
  int NumberOfDegeneracies;

  // Keep track of number of references to points to avoid new/delete calls
  int *References;

  vtkIdType FindEnclosingFaces(double x[3], vtkUnstructuredGrid *Mesh,
                               vtkIdList *tetras, vtkIdList *faces, 
                               vtkIncrementalPointLocator *Locator);

  virtual int FillInputPortInformation(int, vtkInformation*);
private: //members added for performance
  vtkIdList *Tetras; //used in InsertPoint
  vtkIdList *Faces;  //used in InsertPoint
  vtkIdList *BoundaryPts; //used by InsertPoint
  vtkIdList *CheckedTetras; //used by InsertPoint
  vtkIdList *NeiTetras; //used by InsertPoint

private:
  vtkDelaunay3D(const vtkDelaunay3D&);  // Not implemented.
  void operator=(const vtkDelaunay3D&);  // Not implemented.
};

#endif

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