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vtkCellLocator Class Reference

#include <vtkCellLocator.h>

Inheritance diagram for vtkCellLocator:

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Collaboration diagram for vtkCellLocator:

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List of all members.

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
Tests:
vtkCellLocator (Tests)

Definition at line 51 of file vtkCellLocator.h.
virtual void SetNumberOfCellsPerBucket (int)
virtual int GetNumberOfCellsPerBucket ()
static vtkCellLocatorNew ()

Public Types

typedef vtkLocator Superclass

Public Member Functions

virtual const char * GetClassName ()
virtual int IsA (const char *type)
void PrintSelf (ostream &os, vtkIndent indent)
virtual vtkIdListGetCells (int bucket)
virtual void SetCacheCellBounds (int)
virtual int GetCacheCellBounds ()
virtual void CacheCellBoundsOn ()
virtual void CacheCellBoundsOff ()
virtual int IntersectWithLine (double a0[3], double a1[3], double tol, double &t, double x[3], double pcoords[3], int &subId)
virtual int IntersectWithLine (double a0[3], double a1[3], double tol, double &t, double x[3], double pcoords[3], int &subId, vtkIdType &cellId)
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)
void FindClosestPoint (double x[3], double closestPoint[3], vtkIdType &cellId, int &subId, double &dist2)
void FindClosestPoint (double x[3], double closestPoint[3], vtkGenericCell *cell, vtkIdType &cellId, int &subId, double &dist2)
int FindClosestPointWithinRadius (double x[3], double radius, double closestPoint[3], vtkIdType &cellId, int &subId, double &dist2)
int FindClosestPointWithinRadius (double x[3], double radius, double closestPoint[3], vtkGenericCell *cell, vtkIdType &cellId, int &subId, double &dist2)
int FindClosestPointWithinRadius (double x[3], double radius, double closestPoint[3], vtkGenericCell *cell, vtkIdType &cellId, int &subId, double &dist2, int &inside)
virtual int GetNumberOfBuckets (void)
void FreeSearchStructure ()
void BuildLocator ()
void GenerateRepresentation (int level, vtkPolyData *pd)

Static Public Member Functions

static int IsTypeOf (const char *type)
static vtkCellLocatorSafeDownCast (vtkObject *o)

Protected Member Functions

 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])

Protected Attributes

int NumberOfCellsPerBucket
int NumberOfOctants
double Bounds [6]
int NumberOfParents
double H [3]
int NumberOfDivisions
vtkIdList ** Tree
vtkNeighborCells * Buckets
unsigned char * CellHasBeenVisited
unsigned char QueryNumber
int CacheCellBounds
double(* CellBounds )[6]
double OctantBounds [6]


Member Typedef Documentation

typedef vtkLocator vtkCellLocator::Superclass
 

Reimplemented from vtkLocator.

Reimplemented in vtkOBBTree.

Definition at line 54 of file vtkCellLocator.h.


Constructor & Destructor Documentation

vtkCellLocator::vtkCellLocator  )  [protected]
 

vtkCellLocator::~vtkCellLocator  )  [protected]
 


Member Function Documentation

virtual const char* vtkCellLocator::GetClassName  )  [virtual]
 

Reimplemented from vtkLocator.

Reimplemented in vtkOBBTree.

static int vtkCellLocator::IsTypeOf const char *  type  )  [static]
 

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

Reimplemented from vtkLocator.

Reimplemented in vtkOBBTree.

virtual int vtkCellLocator::IsA const char *  type  )  [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 vtkTypeRevisionMacro found in vtkSetGet.h.

Reimplemented from vtkLocator.

Reimplemented in vtkOBBTree.

static vtkCellLocator* vtkCellLocator::SafeDownCast vtkObject o  )  [static]
 

Reimplemented from vtkLocator.

Reimplemented in vtkOBBTree.

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 vtkLocator.

Reimplemented in vtkOBBTree.

static vtkCellLocator* vtkCellLocator::New  )  [static]
 

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

Reimplemented from vtkObject.

Reimplemented in vtkOBBTree.

virtual void vtkCellLocator::SetNumberOfCellsPerBucket int   )  [virtual]
 

Specify the average number of cells in each octant.

virtual int vtkCellLocator::GetNumberOfCellsPerBucket  )  [virtual]
 

Specify the average number of cells in each octant.

virtual void vtkCellLocator::SetCacheCellBounds int   )  [virtual]
 

Boolean controls whether the bounds of each cell are computed only once and then saved. Should be 10 to 20% faster if repeatedly calling any of the FindClosestPoint routines and the extra memory won't cause disk caching (24 extra bytes per cell are required to save the bounds).

virtual int vtkCellLocator::GetCacheCellBounds  )  [virtual]
 

Boolean controls whether the bounds of each cell are computed only once and then saved. Should be 10 to 20% faster if repeatedly calling any of the FindClosestPoint routines and the extra memory won't cause disk caching (24 extra bytes per cell are required to save the bounds).

virtual void vtkCellLocator::CacheCellBoundsOn  )  [virtual]
 

Boolean controls whether the bounds of each cell are computed only once and then saved. Should be 10 to 20% faster if repeatedly calling any of the FindClosestPoint routines and the extra memory won't cause disk caching (24 extra bytes per cell are required to save the bounds).

virtual void vtkCellLocator::CacheCellBoundsOff  )  [virtual]
 

Boolean controls whether the bounds of each cell are computed only once and then saved. Should be 10 to 20% faster if repeatedly calling any of the FindClosestPoint routines and the extra memory won't cause disk caching (24 extra bytes per cell are required to save the bounds).

virtual int vtkCellLocator::IntersectWithLine double  a0[3],
double  a1[3],
double  tol,
double &  t,
double  x[3],
double  pcoords[3],
int &  subId
[virtual]
 

Return intersection point (if any) of finite line with cells contained in cell locator.

Reimplemented in vtkOBBTree.

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

Return intersection point (if any) AND the cell which was intersected by the finite line.

Reimplemented in vtkOBBTree.

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.

Reimplemented in vtkOBBTree.

void vtkCellLocator::FindClosestPoint double  x[3],
double  closestPoint[3],
vtkIdType cellId,
int &  subId,
double &  dist2
 

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.

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

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.

int vtkCellLocator::FindClosestPointWithinRadius double  x[3],
double  radius,
double  closestPoint[3],
vtkIdType cellId,
int &  subId,
double &  dist2
 

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.

int vtkCellLocator::FindClosestPointWithinRadius double  x[3],
double  radius,
double  closestPoint[3],
vtkGenericCell cell,
vtkIdType cellId,
int &  subId,
double &  dist2
 

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 deallocation 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.

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

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).

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).

void vtkCellLocator::FreeSearchStructure  )  [virtual]
 

Satisfy vtkLocator abstract interface.

Implements vtkLocator.

Reimplemented in vtkOBBTree.

void vtkCellLocator::BuildLocator  )  [virtual]
 

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

Implements vtkLocator.

Reimplemented in vtkOBBTree.

void vtkCellLocator::GenerateRepresentation int  level,
vtkPolyData pd
[virtual]
 

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

Implements vtkLocator.

Reimplemented in vtkOBBTree.

void vtkCellLocator::GetBucketNeighbors int  ijk[3],
int  ndivs,
int  level
[protected]
 

void vtkCellLocator::GetOverlappingBuckets double  x[3],
int  ijk[3],
double  dist,
int  prevMinLevel[3],
int  prevMaxLevel[3]
[protected]
 

void vtkCellLocator::ClearCellHasBeenVisited  )  [protected]
 

void vtkCellLocator::ClearCellHasBeenVisited int  id  )  [protected]
 

double vtkCellLocator::Distance2ToBucket double  x[3],
int  nei[3]
[protected]
 

double vtkCellLocator::Distance2ToBounds double  x[3],
double  bounds[6]
[protected]
 

void vtkCellLocator::MarkParents void *  ,
int  ,
int  ,
int  ,
int  ,
int 
[protected]
 

void vtkCellLocator::GetChildren int  idx,
int  level,
int  children[8]
[protected]
 

int vtkCellLocator::GenerateIndex int  offset,
int  numDivs,
int  i,
int  j,
int  k,
vtkIdType idx
[protected]
 

void vtkCellLocator::GenerateFace int  face,
int  numDivs,
int  i,
int  j,
int  k,
vtkPoints pts,
vtkCellArray polys
[protected]
 

void vtkCellLocator::ComputeOctantBounds int  i,
int  j,
int  k
[protected]
 

int vtkCellLocator::IsInOctantBounds double  x[3]  )  [inline, protected]
 

Definition at line 234 of file vtkCellLocator.h.


Member Data Documentation

int vtkCellLocator::NumberOfCellsPerBucket [protected]
 

Definition at line 209 of file vtkCellLocator.h.

int vtkCellLocator::NumberOfOctants [protected]
 

Definition at line 210 of file vtkCellLocator.h.

double vtkCellLocator::Bounds[6] [protected]
 

Definition at line 211 of file vtkCellLocator.h.

int vtkCellLocator::NumberOfParents [protected]
 

Definition at line 212 of file vtkCellLocator.h.

double vtkCellLocator::H[3] [protected]
 

Definition at line 213 of file vtkCellLocator.h.

int vtkCellLocator::NumberOfDivisions [protected]
 

Definition at line 214 of file vtkCellLocator.h.

vtkIdList** vtkCellLocator::Tree [protected]
 

Reimplemented in vtkOBBTree.

Definition at line 215 of file vtkCellLocator.h.

vtkNeighborCells* vtkCellLocator::Buckets [protected]
 

Definition at line 224 of file vtkCellLocator.h.

unsigned char* vtkCellLocator::CellHasBeenVisited [protected]
 

Definition at line 225 of file vtkCellLocator.h.

unsigned char vtkCellLocator::QueryNumber [protected]
 

Definition at line 226 of file vtkCellLocator.h.

int vtkCellLocator::CacheCellBounds [protected]
 

Definition at line 227 of file vtkCellLocator.h.

double(* vtkCellLocator::CellBounds)[6] [protected]
 

Definition at line 229 of file vtkCellLocator.h.

double vtkCellLocator::OctantBounds[6] [protected]
 

Definition at line 233 of file vtkCellLocator.h.


The documentation for this class was generated from the following file:
Generated on Mon Jan 21 23:37:16 2008 for VTK by  doxygen 1.4.3-20050530