/usr/include/paraview/vtkSurfaceVectors.h is in paraview-dev 5.0.1+dfsg1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77  | /*=========================================================================
  Program:   Visualization Toolkit
  Module:    vtkSurfaceVectors.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 vtkSurfaceVectors - Constrains vectors to surface.
// .SECTION Description
// This filter works on point vectors.  It does not work on cell vectors yet.
// A normal is conputed for a point by averaging normals of surrounding
// 2D cells.  The vector is then constrained to be perpendicular to the normal.
#ifndef vtkSurfaceVectors_h
#define vtkSurfaceVectors_h
#include "vtkPVVTKExtensionsDefaultModule.h" //needed for exports
#include "vtkDataSetAlgorithm.h"
class vtkFloatArray;
class vtkIdList;
class VTKPVVTKEXTENSIONSDEFAULT_EXPORT vtkSurfaceVectors : public vtkDataSetAlgorithm
{
public:
  vtkTypeMacro(vtkSurfaceVectors,vtkDataSetAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);
  static vtkSurfaceVectors *New();
//BTX
  enum ConstraintMode {
    Parallel = 0,
    Perpendicular,
    PerpendicularScale
  };
//ETX
  // Description:
  // This mode determines whether this filter projects vectors to be 
  // perpendicular to surface or parallel to surface.  
  // It defaults to parallel.
  vtkSetMacro(ConstraintMode,int);
  vtkGetMacro(ConstraintMode,int);
  void SetConstraintModeToParallel() 
    {this->SetConstraintMode(vtkSurfaceVectors::Parallel);}
  void SetConstraintModeToPerpendicular() 
    {this->SetConstraintMode(vtkSurfaceVectors::Perpendicular);}
  void SetConstraintModeToPerpendicularScale() 
    {this->SetConstraintMode(vtkSurfaceVectors::PerpendicularScale);}
    
protected:
  vtkSurfaceVectors();
  ~vtkSurfaceVectors();
  // Usual data generation method
  virtual int RequestData(vtkInformation *, 
                          vtkInformationVector **, 
                          vtkInformationVector *);
  virtual int RequestUpdateExtent(vtkInformation*,
                                  vtkInformationVector**,
                                  vtkInformationVector*);
  int   ConstraintMode;
private:
  vtkSurfaceVectors(const vtkSurfaceVectors&);  // Not implemented.
  void operator=(const vtkSurfaceVectors&);  // Not implemented.
};
#endif
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