octree-based spatial search object to quickly locate cells More...

#include <vtkCellLocator.h>

Inheritance diagram for vtkCellLocator:

Collaboration diagram for vtkCellLocator:

Public Types
typedef vtkAbstractCellLocator	Superclass

Public Types inherited from vtkAbstractCellLocator
typedef vtkLocator	Superclass

Public Types inherited from vtkLocator
typedef vtkObject	Superclass

Public Types inherited from vtkObject
typedef vtkObjectBase	Superclass

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

vtkCellLocator *	NewInstance () const

void	PrintSelf (ostream &os, vtkIndent indent)

virtual vtkIdList *	GetCells (int bucket)

virtual int	GetNumberOfBuckets (void)

virtual void	FindCellsWithinBounds (double bbox, vtkIdList cells)


void	SetNumberOfCellsPerBucket (int N)

int	GetNumberOfCellsPerBucket ()


virtual int	IntersectWithLine (double a0[3], double a1[3], double tol, double &t, double x[3], double pcoords[3], int &subId, vtkIdType &cellId, vtkGenericCell *cell)


virtual void	FindClosestPoint (double x[3], double closestPoint[3], vtkGenericCell *cell, vtkIdType &cellId, int &subId, double &dist2)


virtual vtkIdType	FindClosestPointWithinRadius (double x[3], double radius, double closestPoint[3], vtkGenericCell *cell, vtkIdType &cellId, int &subId, double &dist2, int &inside)


virtual vtkIdType	FindCell (double x[3], double tol2, vtkGenericCell GenCell, double pcoords[3], double weights)


virtual void	FindCellsAlongLine (double p1[3], double p2[3], double tolerance, vtkIdList *cells)


virtual void	FreeSearchStructure ()

virtual void	BuildLocator ()

virtual void	BuildLocatorIfNeeded ()

virtual void	ForceBuildLocator ()

virtual void	BuildLocatorInternal ()

virtual void	GenerateRepresentation (int level, vtkPolyData *pd)

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

virtual vtkIdType	FindCell (double x[3])

virtual bool	InsideCellBounds (double x[3], vtkIdType cell_ID)

virtual void	SetNumberOfCellsPerNode (int)

virtual int	GetNumberOfCellsPerNode ()

virtual void	SetCacheCellBounds (int)

virtual int	GetCacheCellBounds ()

virtual void	CacheCellBoundsOn ()

virtual void	CacheCellBoundsOff ()

virtual void	SetRetainCellLists (int)

virtual int	GetRetainCellLists ()

virtual void	RetainCellListsOn ()

virtual void	RetainCellListsOff ()

virtual void	SetLazyEvaluation (int)

virtual int	GetLazyEvaluation ()

virtual void	LazyEvaluationOn ()

virtual void	LazyEvaluationOff ()

virtual void	SetUseExistingSearchStructure (int)

virtual int	GetUseExistingSearchStructure ()

virtual void	UseExistingSearchStructureOn ()

virtual void	UseExistingSearchStructureOff ()

virtual int	IntersectWithLine (double p1[3], double p2[3], double tol, double &t, double x[3], double pcoords[3], int &subId)

virtual int	IntersectWithLine (double p1[3], double p2[3], double tol, double &t, double x[3], double pcoords[3], int &subId, vtkIdType &cellId)

virtual int	IntersectWithLine (const double p1[3], const double p2[3], vtkPoints points, vtkIdList cellIds)

virtual void	FindClosestPoint (double x[3], double closestPoint[3], vtkIdType &cellId, int &subId, double &dist2)

virtual vtkIdType	FindClosestPointWithinRadius (double x[3], double radius, double closestPoint[3], vtkIdType &cellId, int &subId, double &dist2)

virtual vtkIdType	FindClosestPointWithinRadius (double x[3], double radius, double closestPoint[3], vtkGenericCell *cell, vtkIdType &cellId, int &subId, double &dist2)

Public Member Functions inherited from vtkLocator
virtual void	Update ()

virtual void	Initialize ()

virtual void	SetDataSet (vtkDataSet *)

virtual vtkDataSet *	GetDataSet ()

virtual void	SetMaxLevel (int)

virtual int	GetMaxLevel ()

virtual int	GetLevel ()

virtual void	SetAutomatic (int)

virtual int	GetAutomatic ()

virtual void	AutomaticOn ()

virtual void	AutomaticOff ()

virtual void	SetTolerance (double)

virtual double	GetTolerance ()

virtual unsigned long	GetBuildTime ()

virtual void	Register (vtkObjectBase *o)

virtual void	UnRegister (vtkObjectBase *o)

vtkLocator *	NewInstance () const

void	PrintSelf (ostream &os, vtkIndent indent)

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

virtual void	DebugOn ()

virtual void	DebugOff ()

bool	GetDebug ()

void	SetDebug (bool debugFlag)

virtual void	Modified ()

virtual unsigned long	GetMTime ()

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 vtkCellLocator *	SafeDownCast (vtkObjectBase *o)

static vtkCellLocator *	New ()

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

static vtkAbstractCellLocator *	SafeDownCast (vtkObjectBase *o)

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

static vtkLocator *	SafeDownCast (vtkObjectBase *o)

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

	vtkCellLocator ()

	~vtkCellLocator ()

void	GetBucketNeighbors (int ijk[3], int ndivs, int level)

void	GetOverlappingBuckets (double x[3], int ijk[3], double dist, int prevMinLevel[3], int prevMaxLevel[3])

void	ClearCellHasBeenVisited ()

void	ClearCellHasBeenVisited (int id)

double	Distance2ToBucket (double x[3], int nei[3])

double	Distance2ToBounds (double x[3], double bounds[6])

void	MarkParents (void *, int, int, int, int, int)

void	GetChildren (int idx, int level, int children[8])

int	GenerateIndex (int offset, int numDivs, int i, int j, int k, vtkIdType &idx)

void	GenerateFace (int face, int numDivs, int i, int j, int k, vtkPoints pts, vtkCellArray polys)

void	ComputeOctantBounds (int i, int j, int k)

int	IsInOctantBounds (double x[3], double tol=0.0)

Protected Member Functions inherited from vtkAbstractCellLocator
	vtkAbstractCellLocator ()

	~vtkAbstractCellLocator ()

virtual bool	StoreCellBounds ()

virtual void	FreeCellBounds ()

Protected Member Functions inherited from vtkLocator
	vtkLocator ()

	~vtkLocator ()

virtual void	ReportReferences (vtkGarbageCollector *)

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
int	NumberOfOctants

double	Bounds [6]

int	NumberOfParents

double	H [3]

int	NumberOfDivisions

vtkIdList **	Tree

vtkNeighborCells *	Buckets

unsigned char *	CellHasBeenVisited

unsigned char	QueryNumber

double	OctantBounds [6]

Protected Attributes inherited from vtkAbstractCellLocator
int	NumberOfCellsPerNode

int	RetainCellLists

int	CacheCellBounds

int	LazyEvaluation

int	UseExistingSearchStructure

vtkGenericCell *	GenericCell

double(*	CellBounds )[6]

Protected Attributes inherited from vtkLocator
vtkDataSet *	DataSet

int	Automatic

double	Tolerance

int	MaxLevel

int	Level

vtkTimeStamp	BuildTime

Protected Attributes inherited from vtkObject
bool	Debug

vtkTimeStamp	MTime

vtkSubjectHelper *	SubjectHelper

Protected Attributes inherited from vtkObjectBase
vtkAtomicInt32	ReferenceCount

vtkWeakPointerBase **	WeakPointers

Detailed Description

octree-based spatial search object to quickly locate cells

vtkCellLocator is a spatial search object to quickly locate cells in 3D. vtkCellLocator uses a uniform-level octree subdivision, where each octant (an octant is also referred to as a bucket) carries an indication of whether it is empty or not, and each leaf octant carries a list of the cells inside of it. (An octant is not empty if it has one or more cells inside of it.) Typical operations are intersection with a line to return candidate cells, or intersection with another vtkCellLocator to return candidate cells.

Warning: Many other types of spatial locators have been developed, such as variable depth octrees and kd-trees. These are often more efficient for the operations described here. vtkCellLocator has been designed for subclassing; so these locators can be derived if necessary.

See also: vtkLocator vtkPointLocator vtkOBBTree

Examples:: vtkCellLocator (Examples)

Tests:: vtkCellLocator (Tests)

Definition at line 51 of file vtkCellLocator.h.

Member Typedef Documentation

typedef vtkAbstractCellLocator vtkCellLocator::Superclass

Definition at line 54 of file vtkCellLocator.h.

Constructor & Destructor Documentation

vtkCellLocator::vtkCellLocator ( )

protected

vtkCellLocator::~vtkCellLocator ( )

protected

Member Function Documentation

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

static

virtual int vtkCellLocator::IsA ( const char * type )

virtual

Standard type and print methods.

Reimplemented from vtkAbstractCellLocator.

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

static

virtual vtkObjectBase* vtkCellLocator::NewInstanceInternal ( ) const

protectedvirtual

Standard type and print methods.

Reimplemented from vtkAbstractCellLocator.

vtkCellLocator* vtkCellLocator::NewInstance ( ) const

void vtkCellLocator::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 vtkAbstractCellLocator.

static vtkCellLocator* vtkCellLocator::New ( )

static

Construct with automatic computation of divisions, averaging 25 cells per bucket.

void vtkCellLocator::SetNumberOfCellsPerBucket ( int N )

inline

Specify the average number of cells in each octant.

Definition at line 63 of file vtkCellLocator.h.

int vtkCellLocator::GetNumberOfCellsPerBucket ( )

inline

Specify the average number of cells in each octant.

Definition at line 65 of file vtkCellLocator.h.

virtual int vtkCellLocator::IntersectWithLine	(	double	a0[3],
		double	a1[3],
		double	tol,
		double &	t,
		double	x[3],
		double	pcoords[3],
		int &	subId,
		vtkIdType &	cellId,
		vtkGenericCell *	cell
	)

virtual

Return intersection point (if any) AND the cell which was intersected by the finite line. The cell is returned as a cell id and as a generic cell. For other IntersectWithLine signatures, see vtkAbstractCellLocator

Reimplemented from vtkAbstractCellLocator.

virtual void vtkCellLocator::FindClosestPoint	(	double	x[3],
		double	closestPoint[3],
		vtkGenericCell *	cell,
		vtkIdType &	cellId,
		int &	subId,
		double &	dist2
	)

virtual

Return the closest point and the cell which is closest to the point x. The closest point is somewhere on a cell, it need not be one of the vertices of the cell. This version takes in a vtkGenericCell to avoid allocating and deallocating the cell. This is much faster than the version which does not take a *cell, especially when this function is called many times in a row such as by a for loop, where the allocation and deallocation can be done only once outside the for loop. If a cell is found, "cell" contains the points and ptIds for the cell "cellId" upon exit.

Reimplemented from vtkAbstractCellLocator.

virtual vtkIdType vtkCellLocator::FindClosestPointWithinRadius	(	double	x[3],
		double	radius,
		double	closestPoint[3],
		vtkGenericCell *	cell,
		vtkIdType &	cellId,
		int &	subId,
		double &	dist2,
		int &	inside
	)

virtual

Return the closest point within a specified radius and the cell which is closest to the point x. The closest point is somewhere on a cell, it need not be one of the vertices of the cell. This method returns 1 if a point is found within the specified radius. If there are no cells within the specified radius, the method returns 0 and the values of closestPoint, cellId, subId, and dist2 are undefined. This version takes in a vtkGenericCell to avoid allocating and deallocating the cell. This is much faster than the version which does not take a *cell, especially when this function is called many times in a row such as by a for loop, where the allocation and dealloction can be done only once outside the for loop. If a closest point is found, "cell" contains the points and ptIds for the cell "cellId" upon exit. If a closest point is found, inside returns the return value of the EvaluatePosition call to the closest cell; inside(=1) or outside(=0). For other FindClosestPointWithinRadius signatures, see vtkAbstractCellLocator

Reimplemented from vtkAbstractCellLocator.

virtual vtkIdList* vtkCellLocator::GetCells ( int bucket )

virtual

Get the cells in a particular bucket.

virtual int vtkCellLocator::GetNumberOfBuckets ( void )

virtual

Return number of buckets available. Insure that the locator has been built before attempting to access buckets (octants).

virtual vtkIdType vtkCellLocator::FindCell	(	double	x[3],
		double	tol2,
		vtkGenericCell *	GenCell,
		double	pcoords[3],
		double *	weights
	)

virtual

Find the cell containing a given point. returns -1 if no cell found the cell parameters are copied into the supplied variables, a cell must be provided to store the information.

Reimplemented from vtkAbstractCellLocator.

virtual void vtkCellLocator::FindCellsWithinBounds	(	double *	bbox,
		vtkIdList *	cells
	)

virtual

Return a list of unique cell ids inside of a given bounding box. The user must provide the vtkIdList to populate. This method returns data only after the locator has been built.

Reimplemented from vtkAbstractCellLocator.

virtual void vtkCellLocator::FindCellsAlongLine	(	double	p1[3],
		double	p2[3],
		double	tolerance,
		vtkIdList *	cells
	)

virtual

Given a finite line defined by the two points (p1,p2), return the list of unique cell ids in the buckets containing the line. It is possible that an empty cell list is returned. The user must provide the vtkIdList to populate. This method returns data only after the locator has been built.

Reimplemented from vtkAbstractCellLocator.

virtual void vtkCellLocator::FreeSearchStructure ( )

virtual