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vtkRecursiveSphereDirectionEncoder Class Reference

A direction encoder based on the recursive subdivision of an octahedron. More...

#include <vtkRecursiveSphereDirectionEncoder.h>

Inheritance diagram for vtkRecursiveSphereDirectionEncoder:

[legend]Collaboration diagram for vtkRecursiveSphereDirectionEncoder:

[legend]List of all members.

Public Methods
virtual const char *	GetClassName ()
virtual int	IsA (const char *type)
void	PrintSelf (ostream &os, vtkIndent index)
int	GetEncodedDirection (float n[3])
float *	GetDecodedGradient (int value)
int	GetNumberOfEncodedDirections (void)
float *	GetDecodedGradientTable (void)
virtual void	SetRecursionDepth (int)
virtual int	GetRecursionDepth ()
Static Public Methods
int	IsTypeOf (const char *type)
vtkRecursiveSphereDirectionEncoder *	SafeDownCast (vtkObject *o)
vtkRecursiveSphereDirectionEncoder *	New ()
Protected Methods
	vtkRecursiveSphereDirectionEncoder ()
	~vtkRecursiveSphereDirectionEncoder ()
void	InitializeIndexTable (void)
Protected Attributes
int	RecursionDepth
int *	IndexTable
float *	DecodedNormal
int	IndexTableRecursionDepth
int	OuterSize
int	InnerSize
int	GridSize

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Detailed Description

A direction encoder based on the recursive subdivision of an octahedron.

Date:

2001/11/13 14:17:28

Revision:

1.17

vtkRecursiveSphereDirectionEncoder is a direction encoder which uses the vertices of a recursive subdivision of an octahedron (with the vertices pushed out onto the surface of an enclosing sphere) to encode directions into a two byte value.

See also:

vtkDirectionEncoder

Definition at line 61 of file vtkRecursiveSphereDirectionEncoder.h.

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Constructor & Destructor Documentation

vtkRecursiveSphereDirectionEncoder::vtkRecursiveSphereDirectionEncoder (    )  [protected]

vtkRecursiveSphereDirectionEncoder::~vtkRecursiveSphereDirectionEncoder (    )  [protected]

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Member Function Documentation

virtual const char* vtkRecursiveSphereDirectionEncoder::GetClassName (    )  [virtual]

Get the name of this class Reimplemented from vtkDirectionEncoder.

int vtkRecursiveSphereDirectionEncoder::IsTypeOf (  const char *    type )  [static]

Get the name of this class Reimplemented from vtkDirectionEncoder.

virtual int vtkRecursiveSphereDirectionEncoder::IsA (  const char *    type )  [virtual]

Get the name of this class Reimplemented from vtkDirectionEncoder.

vtkRecursiveSphereDirectionEncoder* vtkRecursiveSphereDirectionEncoder::SafeDownCast (  vtkObject *    o )  [static]

Get the name of this class Reimplemented from vtkDirectionEncoder.

void vtkRecursiveSphereDirectionEncoder::PrintSelf (  ostream &    os, vtkIndent    index )  [virtual]

Methods invoked by print to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes. Reimplemented from vtkObject.

vtkRecursiveSphereDirectionEncoder* vtkRecursiveSphereDirectionEncoder::New (    )  [static]

Construct the object. Initialize the index table which will be used to map the normal into a patch on the recursively subdivided sphere. Reimplemented from vtkObject.

int vtkRecursiveSphereDirectionEncoder::GetEncodedDirection (  float    n[3] )  [virtual]

Given a normal vector n, return the encoded direction Reimplemented from vtkDirectionEncoder.

float* vtkRecursiveSphereDirectionEncoder::GetDecodedGradient (  int    value )  [virtual]

/ Given an encoded value, return a pointer to the normal vector Reimplemented from vtkDirectionEncoder.

int vtkRecursiveSphereDirectionEncoder::GetNumberOfEncodedDirections (  void    )  [virtual]

Return the number of encoded directions Reimplemented from vtkDirectionEncoder.

float* vtkRecursiveSphereDirectionEncoder::GetDecodedGradientTable (  void    )  [virtual]

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. Reimplemented from vtkDirectionEncoder.

virtual void vtkRecursiveSphereDirectionEncoder::SetRecursionDepth (  int    )  [virtual]

Set / Get the recursion depth for the subdivision. This indicates how many time one triangle on the initial 8-sided sphere model is replaced by four triangles formed by connecting triangle edge midpoints. A recursion level of 0 yields 8 triangles with 6 unique vertices. The normals are the vectors from the sphere center through the vertices. The number of directions will be 11 since the four normals with 0 z values will be duplicated in the table - once with +0 values and the other time with -0 values, and an addition index will be used to represent the (0,0,0) normal. If we instead choose a recursion level of 6 (the maximum that can fit within 2 bytes) the number of directions is 16643, with 16386 unique directions and a zero normal.

virtual int vtkRecursiveSphereDirectionEncoder::GetRecursionDepth (    )  [virtual]

Set / Get the recursion depth for the subdivision. This indicates how many time one triangle on the initial 8-sided sphere model is replaced by four triangles formed by connecting triangle edge midpoints. A recursion level of 0 yields 8 triangles with 6 unique vertices. The normals are the vectors from the sphere center through the vertices. The number of directions will be 11 since the four normals with 0 z values will be duplicated in the table - once with +0 values and the other time with -0 values, and an addition index will be used to represent the (0,0,0) normal. If we instead choose a recursion level of 6 (the maximum that can fit within 2 bytes) the number of directions is 16643, with 16386 unique directions and a zero normal.

void vtkRecursiveSphereDirectionEncoder::InitializeIndexTable (  void    )  [protected]

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Member Data Documentation

int vtkRecursiveSphereDirectionEncoder::RecursionDepth [protected]

Definition at line 109 of file vtkRecursiveSphereDirectionEncoder.h.

int* vtkRecursiveSphereDirectionEncoder::IndexTable [protected]

Definition at line 114 of file vtkRecursiveSphereDirectionEncoder.h.

float* vtkRecursiveSphereDirectionEncoder::DecodedNormal [protected]

Definition at line 120 of file vtkRecursiveSphereDirectionEncoder.h.

int vtkRecursiveSphereDirectionEncoder::IndexTableRecursionDepth [protected]

Definition at line 126 of file vtkRecursiveSphereDirectionEncoder.h.

int vtkRecursiveSphereDirectionEncoder::OuterSize [protected]

Definition at line 128 of file vtkRecursiveSphereDirectionEncoder.h.

int vtkRecursiveSphereDirectionEncoder::InnerSize [protected]

Definition at line 129 of file vtkRecursiveSphereDirectionEncoder.h.

int vtkRecursiveSphereDirectionEncoder::GridSize [protected]

Definition at line 130 of file vtkRecursiveSphereDirectionEncoder.h.

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The documentation for this class was generated from the following file:

• Rendering/vtkRecursiveSphereDirectionEncoder.h

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