vtkPolyDataNormals.h

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

  Program:   Visualization Toolkit
  Module:    vtkPolyDataNormals.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 vtkPolyDataNormals_h
#define vtkPolyDataNormals_h

#include "vtkFiltersCoreModule.h" // For export macro
#include "vtkPolyDataAlgorithm.h"

class vtkFloatArray;
class vtkIdList;
class vtkPolyData;

class VTKFILTERSCORE_EXPORT vtkPolyDataNormals : public vtkPolyDataAlgorithm
{
public:
  vtkTypeMacro(vtkPolyDataNormals,vtkPolyDataAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  static vtkPolyDataNormals *New();


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


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


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


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


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


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


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


  vtkSetMacro(NonManifoldTraversal,vtkTypeBool);
  vtkGetMacro(NonManifoldTraversal,vtkTypeBool);
  vtkBooleanMacro(NonManifoldTraversal,vtkTypeBool);


  vtkSetClampMacro(OutputPointsPrecision, int, SINGLE_PRECISION, DEFAULT_PRECISION);
  vtkGetMacro(OutputPointsPrecision, int);

protected:
  vtkPolyDataNormals();
  ~vtkPolyDataNormals() override {}

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

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

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&) = delete;
  void operator=(const vtkPolyDataNormals&) = delete;
};

#endif