text: /*=========================================================================
  
    Program:   Visualization Toolkit
    Module:    vtkLinearSubdivisionFilter.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.
  
  =========================================================================*/
  /**
   * @class   vtkLinearSubdivisionFilter
   * @brief   generate a subdivision surface using the Linear Scheme
   *
   * vtkLinearSubdivisionFilter is a filter that generates output by
   * subdividing its input polydata. Each subdivision iteration create 4
   * new triangles for each triangle in the polydata.
   *
   * @par Thanks:
   * This work was supported by PHS Research Grant No. 1 P41 RR13218-01
   * from the National Center for Research Resources.
   *
   * @sa
   * vtkInterpolatingSubdivisionFilter vtkButterflySubdivisionFilter
   */
  
  #ifndef vtkLinearSubdivisionFilter_h
  #define vtkLinearSubdivisionFilter_h
  
  #include "vtkFiltersModelingModule.h" // For export macro
  #include "vtkInterpolatingSubdivisionFilter.h"
  
  class vtkIntArray;
  class vtkPointData;
  class vtkPoints;
  class vtkPolyData;
  
  class VTKFILTERSMODELING_EXPORT vtkLinearSubdivisionFilter
    : public vtkInterpolatingSubdivisionFilter
  {
  public:
    ///@{
    /**
     * Construct object with NumberOfSubdivisions set to 1.
     */
    static vtkLinearSubdivisionFilter* New();
    vtkTypeMacro(vtkLinearSubdivisionFilter, vtkInterpolatingSubdivisionFilter);
    void PrintSelf(ostream& os, vtkIndent indent) override;
    ///@}
  
  protected:
    vtkLinearSubdivisionFilter() = default;
    ~vtkLinearSubdivisionFilter() override = default;
  
    int GenerateSubdivisionPoints(vtkPolyData* inputDS, vtkIntArray* edgeData, vtkPoints* outputPts,
      vtkPointData* outputPD) override;
  
  private:
    vtkLinearSubdivisionFilter(const vtkLinearSubdivisionFilter&) = delete;
    void operator=(const vtkLinearSubdivisionFilter&) = delete;
  };
  
  #endif
  