extract subset of unstructured grid geometry More...

#include <vtkExtractUnstructuredGrid.h>

Inheritance diagram for vtkExtractUnstructuredGrid:

Collaboration diagram for vtkExtractUnstructuredGrid:

Public Types
typedef vtkUnstructuredGridAlgorithm	Superclass

Public Types inherited from vtkUnstructuredGridAlgorithm
typedef vtkAlgorithm	Superclass

Public Types inherited from vtkAlgorithm
typedef vtkObject	Superclass

enum	DesiredOutputPrecision { SINGLE_PRECISION, DOUBLE_PRECISION, DEFAULT_PRECISION }

Public Types inherited from vtkObject
typedef vtkObjectBase	Superclass

Public Member Functions
virtual int	IsA (const char *type)

vtkExtractUnstructuredGrid *	NewInstance () const

void	PrintSelf (ostream &os, vtkIndent indent)

void	CreateDefaultLocator ()

unsigned long	GetMTime ()


virtual void	SetPointClipping (int)

virtual int	GetPointClipping ()

virtual void	PointClippingOn ()

virtual void	PointClippingOff ()


virtual void	SetCellClipping (int)

virtual int	GetCellClipping ()

virtual void	CellClippingOn ()

virtual void	CellClippingOff ()


virtual void	SetExtentClipping (int)

virtual int	GetExtentClipping ()

virtual void	ExtentClippingOn ()

virtual void	ExtentClippingOff ()


virtual void	SetPointMinimum (vtkIdType)

virtual vtkIdType	GetPointMinimum ()


virtual void	SetPointMaximum (vtkIdType)

virtual vtkIdType	GetPointMaximum ()


virtual void	SetCellMinimum (vtkIdType)

virtual vtkIdType	GetCellMinimum ()


virtual void	SetCellMaximum (vtkIdType)

virtual vtkIdType	GetCellMaximum ()


void	SetExtent (double xMin, double xMax, double yMin, double yMax, double zMin, double zMax)


void	SetExtent (double extent[6])

double *	GetExtent ()


virtual void	SetMerging (int)

virtual int	GetMerging ()

virtual void	MergingOn ()

virtual void	MergingOff ()


void	SetLocator (vtkIncrementalPointLocator *locator)

virtual vtkIncrementalPointLocator *	GetLocator ()

Public Member Functions inherited from vtkUnstructuredGridAlgorithm
vtkUnstructuredGridAlgorithm *	NewInstance () const

vtkDataObject *	GetInput (int port)

vtkDataObject *	GetInput ()

vtkUnstructuredGrid *	GetUnstructuredGridInput (int port)

vtkUnstructuredGrid *	GetOutput ()

vtkUnstructuredGrid *	GetOutput (int)

virtual void	SetOutput (vtkDataObject *d)

virtual int	ProcessRequest (vtkInformation , vtkInformationVector , vtkInformationVector )

void	SetInputData (vtkDataObject *)

void	SetInputData (int, vtkDataObject *)

void	AddInputData (vtkDataObject *)

void	AddInputData (int, vtkDataObject *)

Public Member Functions inherited from vtkAlgorithm
vtkAlgorithm *	NewInstance () const

int	HasExecutive ()

vtkExecutive *	GetExecutive ()

virtual void	SetExecutive (vtkExecutive *executive)

virtual int	ModifyRequest (vtkInformation *request, int when)

vtkInformation *	GetInputPortInformation (int port)

vtkInformation *	GetOutputPortInformation (int port)

int	GetNumberOfInputPorts ()

int	GetNumberOfOutputPorts ()

void	UpdateProgress (double amount)

vtkInformation *	GetInputArrayInformation (int idx)

void	RemoveAllInputs ()

vtkDataObject *	GetOutputDataObject (int port)

virtual void	RemoveInputConnection (int port, vtkAlgorithmOutput *input)

virtual void	RemoveInputConnection (int port, int idx)

virtual void	RemoveAllInputConnections (int port)

int	GetNumberOfInputConnections (int port)

int	GetTotalNumberOfInputConnections ()

vtkAlgorithmOutput *	GetInputConnection (int port, int index)

vtkAlgorithm *	GetInputAlgorithm (int port, int index, int &algPort)

vtkAlgorithm *	GetInputAlgorithm (int port, int index)

vtkExecutive *	GetInputExecutive (int port, int index)

vtkInformation *	GetInputInformation (int port, int index)

vtkInformation *	GetOutputInformation (int port)

virtual void	UpdateInformation ()

virtual void	UpdateDataObject ()

virtual void	PropagateUpdateExtent ()

virtual void	UpdateWholeExtent ()

void	ConvertTotalInputToPortConnection (int ind, int &port, int &conn)

int	SetUpdateExtentToWholeExtent (int port)

int	SetUpdateExtentToWholeExtent ()

void	SetUpdateExtent (int port, int extent[6])

int	ProcessRequest (vtkInformation request, vtkCollection inInfo, vtkInformationVector *outInfo)

virtual int	ComputePipelineMTime (vtkInformation request, vtkInformationVector inInfoVec, vtkInformationVector outInfoVec, int requestFromOutputPort, unsigned long *mtime)

virtual vtkInformation *	GetInformation ()

virtual void	SetInformation (vtkInformation *)

virtual void	Register (vtkObjectBase *o)

virtual void	UnRegister (vtkObjectBase *o)

virtual void	SetAbortExecute (int)

virtual int	GetAbortExecute ()

virtual void	AbortExecuteOn ()

virtual void	AbortExecuteOff ()

virtual void	SetProgress (double)

virtual double	GetProgress ()

void	SetProgressText (const char *ptext)

virtual char *	GetProgressText ()

virtual unsigned long	GetErrorCode ()

virtual void	SetInputArrayToProcess (int idx, int port, int connection, int fieldAssociation, const char *name)

virtual void	SetInputArrayToProcess (int idx, int port, int connection, int fieldAssociation, int fieldAttributeType)

virtual void	SetInputArrayToProcess (int idx, vtkInformation *info)

virtual void	SetInputArrayToProcess (int idx, int port, int connection, const char fieldAssociation, const char attributeTypeorName)

vtkDataObject *	GetInputDataObject (int port, int connection)

virtual void	SetInputConnection (int port, vtkAlgorithmOutput *input)

virtual void	SetInputConnection (vtkAlgorithmOutput *input)

virtual void	AddInputConnection (int port, vtkAlgorithmOutput *input)

virtual void	AddInputConnection (vtkAlgorithmOutput *input)

virtual void	SetInputDataObject (int port, vtkDataObject *data)

virtual void	SetInputDataObject (vtkDataObject *data)

virtual void	AddInputDataObject (int port, vtkDataObject *data)

virtual void	AddInputDataObject (vtkDataObject *data)

vtkAlgorithmOutput *	GetOutputPort (int index)

vtkAlgorithmOutput *	GetOutputPort ()

vtkAlgorithm *	GetInputAlgorithm ()

vtkExecutive *	GetInputExecutive ()

vtkInformation *	GetInputInformation ()

virtual void	Update (int port)

virtual void	Update ()

virtual void	SetReleaseDataFlag (int)

virtual int	GetReleaseDataFlag ()

void	ReleaseDataFlagOn ()

void	ReleaseDataFlagOff ()

int	UpdateExtentIsEmpty (vtkInformation pinfo, vtkDataObject output)

int	UpdateExtentIsEmpty (vtkInformation *pinfo, int extentType)

void	SetUpdateExtent (int port, int piece, int numPieces, int ghostLevel)

void	SetUpdateExtent (int piece, int numPieces, int ghostLevel)

void	SetUpdateExtent (int extent[6])

int *	GetUpdateExtent ()

int *	GetUpdateExtent (int port)

void	GetUpdateExtent (int &x0, int &x1, int &y0, int &y1, int &z0, int &z1)

void	GetUpdateExtent (int port, int &x0, int &x1, int &y0, int &y1, int &z0, int &z1)

void	GetUpdateExtent (int extent[6])

void	GetUpdateExtent (int port, int extent[6])

int	GetUpdatePiece ()

int	GetUpdatePiece (int port)

int	GetUpdateNumberOfPieces ()

int	GetUpdateNumberOfPieces (int port)

int	GetUpdateGhostLevel ()

int	GetUpdateGhostLevel (int port)

void	SetProgressObserver (vtkProgressObserver *)

virtual vtkProgressObserver *	GetProgressObserver ()

Public Member Functions inherited from vtkObject
vtkObject *	NewInstance () const

virtual void	DebugOn ()

virtual void	DebugOff ()

bool	GetDebug ()

void	SetDebug (bool debugFlag)

virtual void	Modified ()

unsigned long	AddObserver (unsigned long event, vtkCommand *, float priority=0.0f)

unsigned long	AddObserver (const char event, vtkCommand , float priority=0.0f)

vtkCommand *	GetCommand (unsigned long tag)

void	RemoveObserver (vtkCommand *)

void	RemoveObservers (unsigned long event, vtkCommand *)

void	RemoveObservers (const char event, vtkCommand )

int	HasObserver (unsigned long event, vtkCommand *)

int	HasObserver (const char event, vtkCommand )

void	RemoveObserver (unsigned long tag)

void	RemoveObservers (unsigned long event)

void	RemoveObservers (const char *event)

void	RemoveAllObservers ()

int	HasObserver (unsigned long event)

int	HasObserver (const char *event)

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, void(T::*callback)(), float priority=0.0f)

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, void(T::callback)(vtkObject , unsigned long, void *), float priority=0.0f)

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, bool(T::callback)(vtkObject , unsigned long, void *), float priority=0.0f)

int	InvokeEvent (unsigned long event, void *callData)

int	InvokeEvent (const char event, void callData)

int	InvokeEvent (unsigned long event)

int	InvokeEvent (const char *event)

Public Member Functions inherited from vtkObjectBase
const char *	GetClassName () const

virtual void	Delete ()

virtual void	FastDelete ()

void	Print (ostream &os)

void	SetReferenceCount (int)

void	PrintRevisions (ostream &)

virtual void	PrintHeader (ostream &os, vtkIndent indent)

virtual void	PrintTrailer (ostream &os, vtkIndent indent)

int	GetReferenceCount ()

Static Public Member Functions
static int	IsTypeOf (const char *type)

static vtkExtractUnstructuredGrid *	SafeDownCast (vtkObjectBase *o)

static vtkExtractUnstructuredGrid *	New ()

Static Public Member Functions inherited from vtkUnstructuredGridAlgorithm
static vtkUnstructuredGridAlgorithm *	New ()

static int	IsTypeOf (const char *type)

static vtkUnstructuredGridAlgorithm *	SafeDownCast (vtkObjectBase *o)

Static Public Member Functions inherited from vtkAlgorithm
static vtkAlgorithm *	New ()

static int	IsTypeOf (const char *type)

static vtkAlgorithm *	SafeDownCast (vtkObjectBase *o)

static vtkInformationIntegerKey *	INPUT_IS_OPTIONAL ()

static vtkInformationIntegerKey *	INPUT_IS_REPEATABLE ()

static vtkInformationInformationVectorKey *	INPUT_REQUIRED_FIELDS ()

static vtkInformationStringVectorKey *	INPUT_REQUIRED_DATA_TYPE ()

static vtkInformationInformationVectorKey *	INPUT_ARRAYS_TO_PROCESS ()

static vtkInformationIntegerKey *	INPUT_PORT ()

static vtkInformationIntegerKey *	INPUT_CONNECTION ()

static vtkInformationIntegerKey *	CAN_PRODUCE_SUB_EXTENT ()

static vtkInformationIntegerKey *	CAN_HANDLE_PIECE_REQUEST ()

static void	SetDefaultExecutivePrototype (vtkExecutive *proto)

Static Public Member Functions inherited from vtkObject
static int	IsTypeOf (const char *type)

static vtkObject *	SafeDownCast (vtkObjectBase *o)

static vtkObject *	New ()

static void	BreakOnError ()

static void	SetGlobalWarningDisplay (int val)

static void	GlobalWarningDisplayOn ()

static void	GlobalWarningDisplayOff ()

static int	GetGlobalWarningDisplay ()

Static Public Member Functions inherited from vtkObjectBase
static int	IsTypeOf (const char *name)

static vtkObjectBase *	New ()

Protected Member Functions
virtual vtkObjectBase *	NewInstanceInternal () const

	vtkExtractUnstructuredGrid ()

	~vtkExtractUnstructuredGrid ()

virtual int	RequestData (vtkInformation , vtkInformationVector , vtkInformationVector )

Protected Member Functions inherited from vtkUnstructuredGridAlgorithm
	vtkUnstructuredGridAlgorithm ()

	~vtkUnstructuredGridAlgorithm ()

virtual int	RequestInformation (vtkInformation request, vtkInformationVector inputVector, vtkInformationVector outputVector)

virtual int	FillOutputPortInformation (int port, vtkInformation *info)

virtual int	FillInputPortInformation (int port, vtkInformation *info)

virtual int	RequestUpdateExtent (vtkInformation , vtkInformationVector , vtkInformationVector )

Protected Member Functions inherited from vtkAlgorithm
	vtkAlgorithm ()

	~vtkAlgorithm ()

virtual void	SetNumberOfInputPorts (int n)

virtual void	SetNumberOfOutputPorts (int n)

int	InputPortIndexInRange (int index, const char *action)

int	OutputPortIndexInRange (int index, const char *action)

int	GetInputArrayAssociation (int idx, vtkInformationVector **inputVector)

virtual vtkExecutive *	CreateDefaultExecutive ()

virtual void	ReportReferences (vtkGarbageCollector *)

virtual void	SetNumberOfInputConnections (int port, int n)

int	GetInputArrayAssociation (int idx, int connection, vtkInformationVector **inputVector)

int	GetInputArrayAssociation (int idx, vtkDataObject *input)

vtkDataArray *	GetInputArrayToProcess (int idx, vtkInformationVector **inputVector)

vtkDataArray *	GetInputArrayToProcess (int idx, vtkInformationVector **inputVector, int &association)

vtkDataArray *	GetInputArrayToProcess (int idx, int connection, vtkInformationVector **inputVector)

vtkDataArray *	GetInputArrayToProcess (int idx, int connection, vtkInformationVector **inputVector, int &association)

vtkDataArray *	GetInputArrayToProcess (int idx, vtkDataObject *input)

vtkDataArray *	GetInputArrayToProcess (int idx, vtkDataObject *input, int &association)

vtkAbstractArray *	GetInputAbstractArrayToProcess (int idx, vtkInformationVector **inputVector)

vtkAbstractArray *	GetInputAbstractArrayToProcess (int idx, vtkInformationVector **inputVector, int &association)

vtkAbstractArray *	GetInputAbstractArrayToProcess (int idx, int connection, vtkInformationVector **inputVector)

vtkAbstractArray *	GetInputAbstractArrayToProcess (int idx, int connection, vtkInformationVector **inputVector, int &association)

vtkAbstractArray *	GetInputAbstractArrayToProcess (int idx, vtkDataObject *input)

vtkAbstractArray *	GetInputAbstractArrayToProcess (int idx, vtkDataObject *input, int &association)

vtkInformation *	GetInputArrayFieldInformation (int idx, vtkInformationVector **inputVector)

virtual void	SetNthInputConnection (int port, int index, vtkAlgorithmOutput *input)

void	SetInputDataInternal (int port, vtkDataObject *input)

void	AddInputDataInternal (int port, vtkDataObject *input)

virtual void	SetErrorCode (unsigned long)

Protected Member Functions inherited from vtkObject
	vtkObject ()

virtual	~vtkObject ()

virtual void	RegisterInternal (vtkObjectBase *, int check)

virtual void	UnRegisterInternal (vtkObjectBase *, int check)

void	InternalGrabFocus (vtkCommand mouseEvents, vtkCommand keypressEvents=NULL)

void	InternalReleaseFocus ()

Protected Member Functions inherited from vtkObjectBase
	vtkObjectBase ()

virtual	~vtkObjectBase ()

virtual void	CollectRevisions (ostream &)

	vtkObjectBase (const vtkObjectBase &)

void	operator= (const vtkObjectBase &)

Protected Attributes
vtkIdType	PointMinimum

vtkIdType	PointMaximum

vtkIdType	CellMinimum

vtkIdType	CellMaximum

double	Extent [6]

int	PointClipping

int	CellClipping

int	ExtentClipping

int	Merging

vtkIncrementalPointLocator *	Locator

Protected Attributes inherited from vtkAlgorithm
vtkInformation *	Information

double	Progress

char *	ProgressText

vtkProgressObserver *	ProgressObserver

unsigned long	ErrorCode

Protected Attributes inherited from vtkObject
bool	Debug

vtkTimeStamp	MTime

vtkSubjectHelper *	SubjectHelper

Protected Attributes inherited from vtkObjectBase
vtkAtomicInt32	ReferenceCount

vtkWeakPointerBase **	WeakPointers

Additional Inherited Members
Public Attributes inherited from vtkAlgorithm
int	AbortExecute

Static Protected Member Functions inherited from vtkAlgorithm
static vtkInformationIntegerKey *	PORT_REQUIREMENTS_FILLED ()

Static Protected Attributes inherited from vtkAlgorithm
static vtkExecutive *	DefaultExecutivePrototype

Detailed Description

extract subset of unstructured grid geometry

vtkExtractUnstructuredGrid is a general-purpose filter to extract geometry (and associated data) from an unstructured grid dataset. The extraction process is controlled by specifying a range of point ids, cell ids, or a bounding box (referred to as "Extent"). Those cells laying within these regions are sent to the output. The user has the choice of merging coincident points (Merging is on) or using the original point set (Merging is off).

Warning: If merging is off, the input points are copied through to the output. This means unused points may be present in the output data. If merging is on, then coincident points with different point attribute values are merged.

See also: vtkImageDataGeometryFilter vtkStructuredGridGeometryFilter vtkRectilinearGridGeometryFilter vtkExtractGeometry vtkExtractVOI

Examples:: vtkExtractUnstructuredGrid (Examples)

Tests:: vtkExtractUnstructuredGrid (Tests)

Definition at line 52 of file vtkExtractUnstructuredGrid.h.

Member Typedef Documentation

typedef vtkUnstructuredGridAlgorithm vtkExtractUnstructuredGrid::Superclass

Definition at line 55 of file vtkExtractUnstructuredGrid.h.

Constructor & Destructor Documentation

vtkExtractUnstructuredGrid::vtkExtractUnstructuredGrid ( )

protected

vtkExtractUnstructuredGrid::~vtkExtractUnstructuredGrid ( )

inlineprotected

Definition at line 144 of file vtkExtractUnstructuredGrid.h.

Member Function Documentation

static int vtkExtractUnstructuredGrid::IsTypeOf ( const char * type )

static

virtual int vtkExtractUnstructuredGrid::IsA ( const char * name )

virtual

Return 1 if this class is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkUnstructuredGridAlgorithm.

static vtkExtractUnstructuredGrid* vtkExtractUnstructuredGrid::SafeDownCast ( vtkObjectBase * o )

static

virtual vtkObjectBase* vtkExtractUnstructuredGrid::NewInstanceInternal ( ) const

protectedvirtual

Reimplemented from vtkUnstructuredGridAlgorithm.

vtkExtractUnstructuredGrid* vtkExtractUnstructuredGrid::NewInstance ( ) const

void vtkExtractUnstructuredGrid::PrintSelf	(	ostream &	os,
		vtkIndent	indent
	)

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 vtkUnstructuredGridAlgorithm.

static vtkExtractUnstructuredGrid* vtkExtractUnstructuredGrid::New ( )

static

Construct with all types of clipping turned off.

virtual void vtkExtractUnstructuredGrid::SetPointClipping ( int )

virtual

Turn on/off selection of geometry by point id.

virtual int vtkExtractUnstructuredGrid::GetPointClipping ( )

virtual

Turn on/off selection of geometry by point id.

virtual void vtkExtractUnstructuredGrid::PointClippingOn ( )

virtual

Turn on/off selection of geometry by point id.

virtual void vtkExtractUnstructuredGrid::PointClippingOff ( )

virtual

Turn on/off selection of geometry by point id.

virtual void vtkExtractUnstructuredGrid::SetCellClipping ( int )

virtual

Turn on/off selection of geometry by cell id.

virtual int vtkExtractUnstructuredGrid::GetCellClipping ( )

virtual

Turn on/off selection of geometry by cell id.

virtual void vtkExtractUnstructuredGrid::CellClippingOn ( )

virtual

Turn on/off selection of geometry by cell id.

virtual void vtkExtractUnstructuredGrid::CellClippingOff ( )

virtual

Turn on/off selection of geometry by cell id.

virtual void vtkExtractUnstructuredGrid::SetExtentClipping ( int )

virtual

Turn on/off selection of geometry via bounding box.

virtual int vtkExtractUnstructuredGrid::GetExtentClipping ( )

virtual

Turn on/off selection of geometry via bounding box.

virtual void vtkExtractUnstructuredGrid::ExtentClippingOn ( )

virtual

Turn on/off selection of geometry via bounding box.

virtual void vtkExtractUnstructuredGrid::ExtentClippingOff ( )

virtual

Turn on/off selection of geometry via bounding box.

virtual void vtkExtractUnstructuredGrid::SetPointMinimum ( vtkIdType )

virtual

Specify the minimum point id for point id selection.

virtual vtkIdType vtkExtractUnstructuredGrid::GetPointMinimum ( )

virtual

Specify the minimum point id for point id selection.

virtual void vtkExtractUnstructuredGrid::SetPointMaximum ( vtkIdType )

virtual

Specify the maximum point id for point id selection.

virtual vtkIdType vtkExtractUnstructuredGrid::GetPointMaximum ( )

virtual

Specify the maximum point id for point id selection.

virtual void vtkExtractUnstructuredGrid::SetCellMinimum ( vtkIdType )

virtual

Specify the minimum cell id for point id selection.

virtual vtkIdType vtkExtractUnstructuredGrid::GetCellMinimum ( )

virtual

Specify the minimum cell id for point id selection.

virtual void vtkExtractUnstructuredGrid::SetCellMaximum ( vtkIdType )

virtual

Specify the maximum cell id for point id selection.

virtual vtkIdType vtkExtractUnstructuredGrid::GetCellMaximum ( )

virtual

Specify the maximum cell id for point id selection.

void vtkExtractUnstructuredGrid::SetExtent	(	double	xMin,
		double	xMax,
		double	yMin,
		double	yMax,
		double	zMin,
		double	zMax
	)

Specify a (xmin,xmax, ymin,ymax, zmin,zmax) bounding box to clip data.

void vtkExtractUnstructuredGrid::SetExtent ( double extent[6] )

Set / get a (xmin,xmax, ymin,ymax, zmin,zmax) bounding box to clip data.

double* vtkExtractUnstructuredGrid::GetExtent ( )

inline

Set / get a (xmin,xmax, ymin,ymax, zmin,zmax) bounding box to clip data.

Definition at line 117 of file vtkExtractUnstructuredGrid.h.

virtual void vtkExtractUnstructuredGrid::SetMerging ( int )

virtual

Turn on/off merging of coincident points. Note that is merging is on, points with different point attributes (e.g., normals) are merged, which may cause rendering artifacts.

virtual int vtkExtractUnstructuredGrid::GetMerging ( )

virtual

Turn on/off merging of coincident points. Note that is merging is on, points with different point attributes (e.g., normals) are merged, which may cause rendering artifacts.

virtual void vtkExtractUnstructuredGrid::MergingOn ( )

virtual

Turn on/off merging of coincident points. Note that is merging is on, points with different point attributes (e.g., normals) are merged, which may cause rendering artifacts.

virtual void vtkExtractUnstructuredGrid::MergingOff ( )

virtual

Turn on/off merging of coincident points. Note that is merging is on, points with different point attributes (e.g., normals) are merged, which may cause rendering artifacts.

void vtkExtractUnstructuredGrid::SetLocator ( vtkIncrementalPointLocator * locator )

Set / get a spatial locator for merging points. By default an instance of vtkMergePoints is used.

virtual vtkIncrementalPointLocator* vtkExtractUnstructuredGrid::GetLocator ( )

virtual

Set / get a spatial locator for merging points. By default an instance of vtkMergePoints is used.

void vtkExtractUnstructuredGrid::CreateDefaultLocator ( )

Create default locator. Used to create one when none is specified.

unsigned long vtkExtractUnstructuredGrid::GetMTime ( )

virtual

Return the MTime also considering the locator.

Reimplemented from vtkObject.

virtual int vtkExtractUnstructuredGrid::RequestData	(	vtkInformation *	request,
		vtkInformationVector **	inputVector,
		vtkInformationVector *	outputVector
	)