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83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
3 weeks ago
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/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkDirectionEncoder.h
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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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/**
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* @class vtkDirectionEncoder
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* @brief encode a direction into a one or two byte value
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*
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*
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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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* @sa
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* vtkRecursiveSphereDirectionEncoder
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*/
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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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#include "vtkRenderingVolumeModule.h" // For export macro
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class VTKRENDERINGVOLUME_EXPORT vtkDirectionEncoder : public vtkObject
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{
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public:
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//@{
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/**
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* Get the name of this class
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*/
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vtkTypeMacro(vtkDirectionEncoder, vtkObject);
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void PrintSelf(ostream& os, vtkIndent indent) override;
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//@}
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/**
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* Given a normal vector n, return the encoded direction
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*/
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virtual int GetEncodedDirection(float n[3]) = 0;
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/**
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* / Given an encoded value, return a pointer to the normal vector
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*/
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virtual float* GetDecodedGradient(int value) VTK_SIZEHINT(3) = 0;
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/**
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* Return the number of encoded directions
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*/
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virtual int GetNumberOfEncodedDirections(void) = 0;
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/**
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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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*/
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virtual float* GetDecodedGradientTable(void) = 0;
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protected:
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vtkDirectionEncoder() {}
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~vtkDirectionEncoder() override {}
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private:
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vtkDirectionEncoder(const vtkDirectionEncoder&) = delete;
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void operator=(const vtkDirectionEncoder&) = delete;
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};
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#endif
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