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

#include <vtkRecursiveSphereDirectionEncoder.h>

Inheritance diagram for vtkRecursiveSphereDirectionEncoder:

Collaboration diagram for vtkRecursiveSphereDirectionEncoder:

Public Types
typedef vtkDirectionEncoder	Superclass
Public Member Functions
virtual int	IsA (const char *type)
vtkRecursiveSphereDirectionEncoder *	NewInstance () const
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 Member Functions
static int	IsTypeOf (const char *type)
static vtkRecursiveSphereDirectionEncoder *	SafeDownCast (vtkObjectBase *o)
static vtkRecursiveSphereDirectionEncoder *	New ()
Protected Member Functions
virtual vtkObjectBase *	NewInstanceInternal () const
	vtkRecursiveSphereDirectionEncoder ()
	~vtkRecursiveSphereDirectionEncoder ()
void	InitializeIndexTable (void)
Protected Attributes
int	RecursionDepth
int *	IndexTable
float *	DecodedNormal
int	IndexTableRecursionDepth
int	OuterSize
int	InnerSize
int	GridSize

Detailed Description

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

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 34 of file vtkRecursiveSphereDirectionEncoder.h.

Member Typedef Documentation

typedef vtkDirectionEncoder vtkRecursiveSphereDirectionEncoder::Superclass

Get the name of this class

Reimplemented from vtkDirectionEncoder.

Definition at line 37 of file vtkRecursiveSphereDirectionEncoder.h.

Constructor & Destructor Documentation

vtkRecursiveSphereDirectionEncoder::vtkRecursiveSphereDirectionEncoder ( ) [protected]

vtkRecursiveSphereDirectionEncoder::~vtkRecursiveSphereDirectionEncoder ( ) [protected]

Member Function Documentation

static 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.

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

Get the name of this class

Reimplemented from vtkDirectionEncoder.

virtual vtkObjectBase* vtkRecursiveSphereDirectionEncoder::NewInstanceInternal ( ) const [protected, virtual]

Get the name of this class

Reimplemented from vtkDirectionEncoder.

vtkRecursiveSphereDirectionEncoder* vtkRecursiveSphereDirectionEncoder::NewInstance ( ) const

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.

static 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]