dox/Rendering/vtkVolume.h

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

  Program:   Visualization Toolkit
  Module:    vtkVolume.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 __vtkVolume_h
#define __vtkVolume_h

#include "vtkProp3D.h"

class vtkRenderer;
class vtkPropCollection;
class vtkVolumeCollection;
class vtkWindow;
class vtkVolumeProperty;
class vtkAbstractVolumeMapper;

class VTK_RENDERING_EXPORT vtkVolume : public vtkProp3D
{
public:
  vtkTypeMacro(vtkVolume,vtkProp3D);
  void PrintSelf(ostream& os, vtkIndent indent);

  static vtkVolume *New();


  void SetMapper(vtkAbstractVolumeMapper *mapper);
  vtkGetObjectMacro(Mapper, vtkAbstractVolumeMapper);


  void SetProperty(vtkVolumeProperty *property);
  vtkVolumeProperty *GetProperty();

  void GetVolumes(vtkPropCollection *vc);

  void Update();


  double *GetBounds();
  void GetBounds(double bounds[6]) { this->vtkProp3D::GetBounds( bounds ); };
  double GetMinXBound();
  double GetMaxXBound();
  double GetMinYBound();
  double GetMaxYBound();
  double GetMinZBound();
  double GetMaxZBound();

  unsigned long int GetMTime();

  unsigned long GetRedrawMTime();

  void ShallowCopy(vtkProp *prop);

//BTX
  int RenderVolumetricGeometry(vtkViewport *viewport);

  void ReleaseGraphicsResources(vtkWindow *);


  float *GetCorrectedScalarOpacityArray(int);
  float *GetCorrectedScalarOpacityArray()
    {return this->GetCorrectedScalarOpacityArray(0);};


  float *GetScalarOpacityArray(int);
  float *GetScalarOpacityArray(){return this->GetScalarOpacityArray(0);};


  float *GetGradientOpacityArray(int);
  float *GetGradientOpacityArray(){return this->GetGradientOpacityArray(0);};


  float *GetGrayArray(int);
  float *GetGrayArray(){return this->GetGrayArray(0);};


  float *GetRGBArray(int);
  float *GetRGBArray(){return this->GetRGBArray(0);};


  float  GetGradientOpacityConstant(int);
  float  GetGradientOpacityConstant()
    {return this->GetGradientOpacityConstant(0);};

  float  GetArraySize () { return static_cast<float>(this->ArraySize); };

  void UpdateTransferFunctions( vtkRenderer *ren );


  void UpdateScalarOpacityforSampleSize( vtkRenderer *ren, 
                                         float sample_distance );

//ETX

protected:
  vtkVolume();
  ~vtkVolume();

  vtkAbstractVolumeMapper      *Mapper;
  vtkVolumeProperty            *Property;

  // The rgb transfer function array - for unsigned char data this
  // is 256 elements, for short or unsigned short it is 65536 elements
  // This is a sample at each scalar value of the rgb transfer
  // function.  A time stamp is kept to know when it needs rebuilding
  float                *RGBArray[VTK_MAX_VRCOMP];
  vtkTimeStamp          RGBArrayMTime[VTK_MAX_VRCOMP];

  // The gray transfer function array - for unsigned char data this
  // is 256 elements, for short or unsigned short it is 65536 elements
  // This is a sample at each scalar value of the gray transfer
  // function.  A time stamp is kept to know when it needs rebuilding
  float                *GrayArray[VTK_MAX_VRCOMP];
  vtkTimeStamp          GrayArrayMTime[VTK_MAX_VRCOMP];

  // The scalar opacity transfer function array - for unsigned char data this
  // is 256 elements, for short or unsigned short it is 65536 elements
  // This is a sample at each scalar value of the opacity transfer
  // function.  A time stamp is kept to know when it needs rebuilding
  float                *ScalarOpacityArray[VTK_MAX_VRCOMP];
  vtkTimeStamp          ScalarOpacityArrayMTime[VTK_MAX_VRCOMP];

  // The corrected scalar opacity transfer function array - this is identical
  // to the opacity transfer function array when the step size is 1.
  // In other cases, it is corrected to reflect the new material thickness
  // modeled by a step size different than 1.
  float                *CorrectedScalarOpacityArray[VTK_MAX_VRCOMP];
  vtkTimeStamp          CorrectedScalarOpacityArrayMTime[VTK_MAX_VRCOMP];

  // CorrectedStepSize is the step size currently modeled by
  // CorrectedArray.  It is used to determine when the 
  // CorrectedArray needs to be updated to match SampleDistance
  // in the volume mapper.
  float                CorrectedStepSize;

  // Number of elements in the rgb, gray, and opacity transfer function arrays
  int                  ArraySize;

  // The magnitude of gradient opacity transfer function array
  float                GradientOpacityArray[VTK_MAX_VRCOMP][256];
  float                GradientOpacityConstant[VTK_MAX_VRCOMP];
  vtkTimeStamp         GradientOpacityArrayMTime[VTK_MAX_VRCOMP];

  // Function to compute screen coverage of this volume
  double ComputeScreenCoverage( vtkViewport *vp );
  
private:
  vtkVolume(const vtkVolume&);  // Not implemented.
  void operator=(const vtkVolume&);  // Not implemented.
};

#endif

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