text: /*=========================================================================
  
    Program:   Visualization Toolkit
    Module:    vtkValuePasses.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   vtkValuePasses
   * @brief   Top level pass to render scene for ValuePainter
   *
   * vtkValuePasses sets up and renders the scene with a
   * black background (vtkClearRGBPass), antialising and other effects turned off and an inner
   * ValuePass renderer for opaque objects so that the drawn values can be
   * read back from the screen and used later.
   *
   * @sa
   * vtkClearRGBPass, vtkValuePass, vtkValuePainter
  */
  
  #ifndef vtkValuePasses_h
  #define vtkValuePasses_h
  
  #include "vtkRenderingOpenGLModule.h" // For export macro
  #include "vtkRenderPass.h"
  
  class VTKRENDERINGOPENGL_EXPORT vtkValuePasses : public vtkRenderPass
  {
  public:
    static vtkValuePasses *New();
    vtkTypeMacro(vtkValuePasses,vtkRenderPass);
    void PrintSelf(ostream& os, vtkIndent indent) override;
  
    /**
     * orchestrates inner helpers to perform overall rendering stateT
     */
    void Render(const vtkRenderState *s) override;
  
    //@{
    /**
     * Set the array to be drawn. By default point scalars are
     */
    void SetInputArrayToProcess(int fieldAssociation, const char *name);
    void SetInputArrayToProcess(int fieldAssociation, int fieldAttributeType);
    void SetInputComponentToProcess(int comp);
    void SetScalarRange(double min, double max);
    //@}
  
   protected:
    /**
     * Default constructor.
     */
    vtkValuePasses();
  
    /**
     * Destructor.
     */
    ~vtkValuePasses() override;
  
   private:
    vtkValuePasses(const vtkValuePasses&) = delete;
    void operator=(const vtkValuePasses&) = delete;
  
    class vtkInternals;
    vtkInternals *Internals;
  };
  
  #endif
  