dox/VolumeRendering/vtkRecursiveSphereDirectionEncoder.h

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

  Program:   Visualization Toolkit
  Module:    vtkRecursiveSphereDirectionEncoder.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 __vtkRecursiveSphereDirectionEncoder_h
#define __vtkRecursiveSphereDirectionEncoder_h

#include "vtkDirectionEncoder.h"

class VTK_VOLUMERENDERING_EXPORT vtkRecursiveSphereDirectionEncoder : public vtkDirectionEncoder
{
public:
  vtkTypeMacro(vtkRecursiveSphereDirectionEncoder,vtkDirectionEncoder);
  void PrintSelf( ostream& os, vtkIndent indent );

  static vtkRecursiveSphereDirectionEncoder *New();


  int GetEncodedDirection( float n[3] );
  
  float *GetDecodedGradient( int value );

  int GetNumberOfEncodedDirections( void );

  float *GetDecodedGradientTable( void );


  vtkSetClampMacro( RecursionDepth, int, 0, 6 );
  vtkGetMacro( RecursionDepth, int );                                        

protected:
  vtkRecursiveSphereDirectionEncoder();
  ~vtkRecursiveSphereDirectionEncoder();

  // How far to recursively divide the sphere
  int                     RecursionDepth;
  
  // The index table which maps (x,y) position in the rotated grid
  // to an encoded normal 
  //int                   IndexTable[2*NORM_SQR_SIZE - 1][2*NORM_SQR_SIZE -1];
  int                     *IndexTable;

  // This is a table that maps encoded normal (2 byte value) to a 
  // normal (dx, dy, dz)
  //float                 DecodedNormal[3*(1 + 2*(NORM_SQR_SIZE*NORM_SQR_SIZE+
  //                             (NORM_SQR_SIZE-1)*(NORM_SQR_SIZE-1)))];
  float                   *DecodedNormal;

  // Method to initialize the index table and variable that
  // stored the recursion depth the last time the table was
  // built
  void                  InitializeIndexTable( void );
  int                   IndexTableRecursionDepth;

  int                   OuterSize;
  int                   InnerSize;
  int                   GridSize;
private:
  vtkRecursiveSphereDirectionEncoder(const vtkRecursiveSphereDirectionEncoder&);  // Not implemented.
  void operator=(const vtkRecursiveSphereDirectionEncoder&);  // Not implemented.
}; 


#endif

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