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/*=========================================================================
Program: Visualization Toolkit
Module: $RCSfile: vtkDirectionEncoder.h,v $
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 vtkDirectionEncoder - encode a direction into a one or two byte value
//
// .SECTION Description
// Given a direction, encode it into an integer value. This value should
// be less than 65536, which is the maximum number of encoded directions
// supported by this superclass. A direction encoded is used to encode
// normals in a volume for use during volume rendering, and the
// amount of space that is allocated per normal is 2 bytes.
// This is an abstract superclass - see the subclasses for specific
// implementation details.
//
// .SECTION see also
// vtkRecursiveSphereDirectionEncoder
#ifndef __vtkDirectionEncoder_h
#define __vtkDirectionEncoder_h
#include "vtkObject.h"
class VTK_VOLUMERENDERING_EXPORT vtkDirectionEncoder : public vtkObject
{
public:
// Description:
// Get the name of this class
vtkTypeRevisionMacro(vtkDirectionEncoder,vtkObject);
virtual void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Given a normal vector n, return the encoded direction
virtual int GetEncodedDirection( float n[3] )=0;
// Description:
/// Given an encoded value, return a pointer to the normal vector
virtual float *GetDecodedGradient( int value )=0;
// Description:
// Return the number of encoded directions
virtual int GetNumberOfEncodedDirections( void )=0;
// Description:
// Get the decoded gradient table. There are
// this->GetNumberOfEncodedDirections() entries in the table, each
// containing a normal (direction) vector. This is a flat structure -
// 3 times the number of directions floats in an array.
virtual float *GetDecodedGradientTable( void )=0;
protected:
vtkDirectionEncoder() {};
~vtkDirectionEncoder() {};
private:
vtkDirectionEncoder(const vtkDirectionEncoder&); // Not implemented.
void operator=(const vtkDirectionEncoder&); // Not implemented.
};
#endif
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