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graphics/vtkDelaunay3D.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkDelaunay3D.h,v $
  Language:  C++


Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
   of any contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.

 * Modified source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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

#include "vtkUnstructuredGridSource.h"

class vtkTetraArray;

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

  static vtkDelaunay3D *New();

  vtkSetClampMacro(Alpha,float,0.0,VTK_LARGE_FLOAT);
  vtkGetMacro(Alpha,float);

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

  vtkSetClampMacro(Offset,float,2.5,VTK_LARGE_FLOAT);
  vtkGetMacro(Offset,float);

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

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

  void CreateDefaultLocator();

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

  vtkUnstructuredGrid *InitPointInsertion(int numPtsToInsert,  int numTetra,
                          vtkPoints *boundingTetraPts, float bounds[6],
                          vtkPoints* &pts);
  
  void InsertPoint(vtkUnstructuredGrid *Mesh, vtkPoints *points,
                   int id, float x[3], vtkIdList *holeTetras);

  void EndPointInsertion();

  unsigned long GetMTime();

  virtual void SetInput(vtkPointSet *input);
  vtkPointSet *GetInput();

#ifndef VTK_REMOVE_LEGACY_CODE

  void SetLocator(vtkPointLocator& locator) 
    {VTK_LEGACY_METHOD(SetLocator,"3.2"); this->SetLocator(&locator);}
  vtkUnstructuredGrid *InitPointInsertion(int numPtsToInsert,  int numTetra,
                                          vtkPoints &boundingTetraPts, 
                                          float bounds[6], vtkPoints* &pts) 
    {VTK_LEGACY_METHOD(InitPointInsertion,"3.2"); 
    return this->InitPointInsertion(numPtsToInsert, numTetra, 
                                    &boundingTetraPts, bounds, pts);}
  void InsertPoint(vtkUnstructuredGrid *Mesh, vtkPoints *points,
                   int id, float x[3], vtkIdList &holeTetras) 
    {VTK_LEGACY_METHOD(InsertPoint,"3.2"); this->InsertPoint(Mesh, points, id, x, &holeTetras);}
#endif
  
protected:
  vtkDelaunay3D();
  ~vtkDelaunay3D();
  vtkDelaunay3D(const vtkDelaunay3D&) {};
  void operator=(const vtkDelaunay3D&) {};

  void Execute();

  float Alpha;
  float Tolerance;
  int BoundingTriangulation;
  float Offset;

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

  int FindEnclosingFaces(float x[3], vtkUnstructuredGrid *Mesh,
                         vtkIdList *tetras, vtkIdList *faces, 
                         vtkPointLocator *Locator);
  
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

};

#endif

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