Main Page Class Hierarchy Alphabetical List Compound List File List Compound Members File Members Related Pages

vtkRecursiveSphereDirectionEncoder Class Reference

#include <vtkRecursiveSphereDirectionEncoder.h>

Inheritance diagram for vtkRecursiveSphereDirectionEncoder:

[legend]Collaboration diagram for vtkRecursiveSphereDirectionEncoder:

[legend]List of all members.

Detailed Description

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

Date:: 2002/08/22 18:39:31

Revision:: 1.20

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

Created by:

Avila, Lisa

CVS contributions (if > 5%):

Avila, Lisa (84%)
Lorensen, Bill (5%)

CVS logs (CVSweb):

.cxx (/Rendering/vtkRecursiveSphereDirectionEncoder.cxx)
.h (/Rendering/vtkRecursiveSphereDirectionEncoder.h)

Definition at line 48 of file vtkRecursiveSphereDirectionEncoder.h.

Public Types

typedef vtkDirectionEncoder Superclass

Public Methods

virtual const char * GetClassName ()

virtual int IsA (const char *type)

void PrintSelf (ostream &os, vtkIndent indent)

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

Member Typedef Documentation

typedef vtkDirectionEncoder vtkRecursiveSphereDirectionEncoder::Superclass

Get the name of this class
Reimplemented from vtkDirectionEncoder.
Definition at line 51 of file vtkRecursiveSphereDirectionEncoder.h.

Constructor & Destructor Documentation

vtkRecursiveSphereDirectionEncoder::vtkRecursiveSphereDirectionEncoder ( ) [protected]

vtkRecursiveSphereDirectionEncoder::~vtkRecursiveSphereDirectionEncoder ( ) [protected]

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 indent

) [virtual]

Get the name of this class
Reimplemented from vtkDirectionEncoder.

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
Implements vtkDirectionEncoder.

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

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

int vtkRecursiveSphereDirectionEncoder::GetNumberOfEncodedDirections ( void ) [virtual]

Return the number of encoded directions
Implements 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.
Implements 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]

Member Data Documentation

int vtkRecursiveSphereDirectionEncoder::RecursionDepth [protected]

Definition at line 96 of file vtkRecursiveSphereDirectionEncoder.h.

int* vtkRecursiveSphereDirectionEncoder::IndexTable [protected]

Definition at line 101 of file vtkRecursiveSphereDirectionEncoder.h.

float* vtkRecursiveSphereDirectionEncoder::DecodedNormal [protected]

Definition at line 107 of file vtkRecursiveSphereDirectionEncoder.h.

int vtkRecursiveSphereDirectionEncoder::IndexTableRecursionDepth [protected]

Definition at line 113 of file vtkRecursiveSphereDirectionEncoder.h.

int vtkRecursiveSphereDirectionEncoder::OuterSize [protected]

Definition at line 115 of file vtkRecursiveSphereDirectionEncoder.h.

int vtkRecursiveSphereDirectionEncoder::InnerSize [protected]

Definition at line 116 of file vtkRecursiveSphereDirectionEncoder.h.

int vtkRecursiveSphereDirectionEncoder::GridSize [protected]

Definition at line 117 of file vtkRecursiveSphereDirectionEncoder.h.

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

Rendering/vtkRecursiveSphereDirectionEncoder.h


Public Types
typedef vtkDirectionEncoder	Superclass
Public Methods
virtual const char *	GetClassName ()
virtual int	IsA (const char *type)
void	PrintSelf (ostream &os, vtkIndent indent)
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