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78 lines
2.4 KiB
78 lines
2.4 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkDirectionEncoder.h,v $
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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// .NAME vtkDirectionEncoder - encode a direction into a one or two byte value
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//
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// .SECTION Description
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// Given a direction, encode it into an integer value. This value should
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// be less than 65536, which is the maximum number of encoded directions
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// supported by this superclass. A direction encoded is used to encode
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// normals in a volume for use during volume rendering, and the
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// amount of space that is allocated per normal is 2 bytes.
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// This is an abstract superclass - see the subclasses for specific
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// implementation details.
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//
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// .SECTION see also
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// vtkRecursiveSphereDirectionEncoder
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#ifndef __vtkDirectionEncoder_h
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#define __vtkDirectionEncoder_h
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#include "vtkObject.h"
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class VTK_VOLUMERENDERING_EXPORT vtkDirectionEncoder : public vtkObject
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{
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public:
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// Description:
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// Get the name of this class
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vtkTypeRevisionMacro(vtkDirectionEncoder,vtkObject);
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virtual void PrintSelf(ostream& os, vtkIndent indent);
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// Description:
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// Given a normal vector n, return the encoded direction
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virtual int GetEncodedDirection( float n[3] )=0;
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// Description:
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/// Given an encoded value, return a pointer to the normal vector
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virtual float *GetDecodedGradient( int value )=0;
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// Description:
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// Return the number of encoded directions
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virtual int GetNumberOfEncodedDirections( void )=0;
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// Description:
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// Get the decoded gradient table. There are
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// this->GetNumberOfEncodedDirections() entries in the table, each
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// containing a normal (direction) vector. This is a flat structure -
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// 3 times the number of directions floats in an array.
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virtual float *GetDecodedGradientTable( void )=0;
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protected:
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vtkDirectionEncoder() {};
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~vtkDirectionEncoder() {};
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private:
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vtkDirectionEncoder(const vtkDirectionEncoder&); // Not implemented.
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void operator=(const vtkDirectionEncoder&); // Not implemented.
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};
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#endif
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