dox/Graphics/vtkPolyDataNormals.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkPolyDataNormals.h,v $

  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 __vtkPolyDataNormals_h
#define __vtkPolyDataNormals_h

#include "vtkPolyDataAlgorithm.h"

class vtkFloatArray;
class vtkIdList;
class vtkPolyData;

class VTK_GRAPHICS_EXPORT vtkPolyDataNormals : public vtkPolyDataAlgorithm
{
public:
  vtkTypeRevisionMacro(vtkPolyDataNormals,vtkPolyDataAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);

  static vtkPolyDataNormals *New();


  vtkSetClampMacro(FeatureAngle,double,0.0,180.0);
  vtkGetMacro(FeatureAngle,double);


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


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


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


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


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


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


  vtkSetMacro(NonManifoldTraversal,int);
  vtkGetMacro(NonManifoldTraversal,int);
  vtkBooleanMacro(NonManifoldTraversal,int);
  
protected:
  vtkPolyDataNormals();
  ~vtkPolyDataNormals() {};

  // Usual data generation method
  int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);

  double FeatureAngle;
  int Splitting;
  int Consistency;
  int FlipNormals;
  int AutoOrientNormals;
  int NonManifoldTraversal;
  int ComputePointNormals;
  int ComputeCellNormals;
  int NumFlips;

private:
  vtkIdList *Wave;
  vtkIdList *Wave2;
  vtkIdList *CellIds;
  vtkIdList *Map;
  vtkPolyData *OldMesh;
  vtkPolyData *NewMesh;
  int *Visited;
  vtkFloatArray *PolyNormals;
  double CosAngle;

  // Uses the list of cell ids (this->Wave) to propagate a wave of
  // checked and properly ordered polygons.
  void TraverseAndOrder(void);

  // Check the point id give to see whether it lies on a feature
  // edge. If so, split the point (i.e., duplicate it) to topologically
  // separate the mesh.
  void MarkAndSplit(vtkIdType ptId);

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

#endif

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