VTK: vtkEmptyCell Class Reference

| VTK 9.3.1

Public Types | Public Member Functions | Static Public Member Functions | Protected Member Functions | List of all members
vtkEmptyCell Class Reference

an empty cell used as a place-holder during processing More...

`#include <vtkEmptyCell.h>`

Inheritance diagram for vtkEmptyCell:
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Collaboration diagram for vtkEmptyCell:
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## Public Types
typedef vtkCell | Superclass
Public Types inherited from vtkCell
typedef vtkObject | Superclass

## Public Member Functions
virtual vtkTypeBool | IsA (const char *type)
| Return 1 if this class is the same type of (or a subclass of) the named class. More...
vtkEmptyCell * | NewInstance () const
void | PrintSelf (ostream &os, vtkIndent indent) override
| Methods invoked by print to print information about the object including superclasses. More...
int | EvaluatePosition (const double x[3], double closestPoint[3], int &subId, double pcoords[3], double &dist2, double weights[]) override
| Given a point x[3] return inside(=1), outside(=0) cell, or (-1) computational problem encountered; evaluate parametric coordinates, sub-cell id (!=0 only if cell is composite), distance squared of point x[3] to cell (in particular, the sub-cell indicated), closest point on cell to x[3] (unless closestPoint is null, in which case, the closest point and dist2 are not found), and interpolation weights in cell. More...
void | EvaluateLocation (int &subId, const double pcoords[3], double x[3], double *weights) override
| Determine global coordinate (x[3]) from subId and parametric coordinates. More...
int | IntersectWithLine (const double p1[3], const double p2[3], double tol, double &t, double x[3], double pcoords[3], int &subId) override
| Intersect with a ray. More...
int | Triangulate (int index, vtkIdList *ptIds, vtkPoints *pts) override
| Generate simplices of proper dimension. More...
void | Derivatives (int subId, const double pcoords[3], const double *values, int dim, double *derivs) override
| Compute derivatives given cell subId and parametric coordinates. More...
int | GetCellType () override
| See the vtkCell API for descriptions of these methods. More...
int | GetCellDimension () override
| See the vtkCell API for descriptions of these methods. More...
int | GetNumberOfEdges () override
| See the vtkCell API for descriptions of these methods. More...
int | GetNumberOfFaces () override
| See the vtkCell API for descriptions of these methods. More...
vtkCell * | GetEdge (int) override
| See the vtkCell API for descriptions of these methods. More...
vtkCell * | GetFace (int) override
| See the vtkCell API for descriptions of these methods. More...
int | CellBoundary (int subId, const double pcoords[3], vtkIdList *pts) override
| See the vtkCell API for descriptions of these methods. More...
void | Contour (double value, vtkDataArray *cellScalars, vtkIncrementalPointLocator *locator, vtkCellArray *verts1, vtkCellArray *lines, vtkCellArray *verts2, vtkPointData *inPd, vtkPointData *outPd, vtkCellData *inCd, vtkIdType cellId, vtkCellData *outCd) override
| See the vtkCell API for descriptions of these methods. More...
void | Clip (double value, vtkDataArray *cellScalars, vtkIncrementalPointLocator *locator, vtkCellArray *pts, vtkPointData *inPd, vtkPointData *outPd, vtkCellData *inCd, vtkIdType cellId, vtkCellData *outCd, int insideOut) override
| See the vtkCell API for descriptions of these methods. More...
Public Member Functions inherited from vtkCell
vtkCell * | NewInstance () const
void | Initialize (int npts, const vtkIdType *pts, vtkPoints *p)
| Initialize cell from outside with point ids and point coordinates specified. More...
void | Initialize (int npts, vtkPoints *p)
| Initialize the cell with point coordinates specified. More...
virtual void | ShallowCopy (vtkCell *c)
| Copy this cell by reference counting the internal data structures. More...
virtual void | DeepCopy (vtkCell *c)
| Copy this cell by completely copying internal data structures. More...
virtual int | IsLinear ()
| Non-linear cells require special treatment beyond the usual cell type and connectivity list information. More...
virtual int | RequiresInitialization ()
| Some cells require initialization prior to access. More...
virtual void | Initialize ()
virtual int | IsExplicitCell ()
| Explicit cells require additional representational information beyond the usual cell type and connectivity list information. More...
virtual int | RequiresExplicitFaceRepresentation ()
| Determine whether the cell requires explicit face representation, and methods for setting and getting the faces (see vtkPolyhedron for example usage of these methods). More...
virtual void | SetFaces (vtkIdType *vtkNotUsed(faces))
virtual vtkIdType * | GetFaces ()
vtkPoints * | GetPoints ()
| Get the point coordinates for the cell. More...
vtkIdType | GetNumberOfPoints () const
| Return the number of points in the cell. More...
vtkIdList * | GetPointIds ()
| Return the list of point ids defining the cell. More...
vtkIdType | GetPointId (int ptId)
| For cell point i, return the actual point id. More...
virtual int | Inflate (double dist)
| Inflates the cell. More...
virtual double | ComputeBoundingSphere (double center[3]) const
| Computes the bounding sphere of the cell. More...
void | GetBounds (double bounds[6])
| Compute cell bounding box (xmin,xmax,ymin,ymax,zmin,zmax). More...
double * | GetBounds ()
| Compute cell bounding box (xmin,xmax,ymin,ymax,zmin,zmax). More...
double | GetLength2 ()
| Compute Length squared of cell (i.e., bounding box diagonal squared). More...
virtual int | GetParametricCenter (double pcoords[3])
| Return center of the cell in parametric coordinates. More...
virtual double | GetParametricDistance (const double pcoords[3])
| Return the distance of the parametric coordinate provided to the cell. More...
virtual int | IsPrimaryCell ()
| Return whether this cell type has a fixed topology or whether the topology varies depending on the data (e.g., vtkConvexPointSet). More...
virtual double * | GetParametricCoords ()
| Return a contiguous array of parametric coordinates of the points defining this cell. More...
virtual void | InterpolateFunctions (const double vtkNotUsed(pcoords)[3], double *vtkNotUsed(weight))
| Compute the interpolation functions/derivatives (aka shape functions/derivatives) No-ops at this level. More...
virtual void | InterpolateDerivs (const double vtkNotUsed(pcoords)[3], double *vtkNotUsed(derivs))
virtual int | IntersectWithCell (vtkCell *other, double tol=0.0)
| Intersects with an other cell. More...
virtual int | IntersectWithCell (vtkCell *other, const vtkBoundingBox &boudingBox, const vtkBoundingBox &otherBoundingBox, double tol=0.0)
| Intersects with an other cell. More...
Public Member Functions inherited from vtkObject
| vtkBaseTypeMacro (vtkObject, vtkObjectBase)
virtual void | DebugOn ()
| Turn debugging output on. More...
virtual void | DebugOff ()
| Turn debugging output off. More...
bool | GetDebug ()
| Get the value of the debug flag. More...
void | SetDebug (bool debugFlag)
| Set the value of the debug flag. More...
virtual void | Modified ()
| Update the modification time for this object. More...
virtual vtkMTimeType | GetMTime ()
| Return this object's modified time. More...
void | RemoveObserver (unsigned long tag)
void | RemoveObservers (unsigned long event)
void | RemoveObservers (const char *event)
void | RemoveAllObservers ()
vtkTypeBool | HasObserver (unsigned long event)
vtkTypeBool | HasObserver (const char *event)
vtkTypeBool | InvokeEvent (unsigned long event)
vtkTypeBool | InvokeEvent (const char *event)
std::string | GetObjectDescription () const override
| The object description printed in messages and PrintSelf output. More...
unsigned long | AddObserver (unsigned long event, vtkCommand *, float priority=0.0f)
| Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...
unsigned long | AddObserver (const char *event, vtkCommand *, float priority=0.0f)
| Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...
vtkCommand * | GetCommand (unsigned long tag)
| Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...
void | RemoveObserver (vtkCommand *)
| Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...
void | RemoveObservers (unsigned long event, vtkCommand *)
| Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...
void | RemoveObservers (const char *event, vtkCommand *)
| Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...
vtkTypeBool | HasObserver (unsigned long event, vtkCommand *)
| Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...
vtkTypeBool | HasObserver (const char *event, vtkCommand *)
| Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...
template<class U , class T >
unsigned long | AddObserver (unsigned long event, U observer, void(T::*callback)(), float priority=0.0f)
| Overloads to AddObserver that allow developers to add class member functions as callbacks for events. More...
template<class U , class T >
unsigned long | AddObserver (unsigned long event, U observer, void(T::*callback)(vtkObject *, unsigned long, void *), float priority=0.0f)
| Overloads to AddObserver that allow developers to add class member functions as callbacks for events. More...
template<class U , class T >
unsigned long | AddObserver (unsigned long event, U observer, bool(T::*callback)(vtkObject *, unsigned long, void *), float priority=0.0f)
| Allow user to set the AbortFlagOn() with the return value of the callback method. More...
vtkTypeBool | InvokeEvent (unsigned long event, void *callData)
| This method invokes an event and return whether the event was aborted or not. More...
vtkTypeBool | InvokeEvent (const char *event, void *callData)
| This method invokes an event and return whether the event was aborted or not. More...
virtual void | SetObjectName (const std::string &objectName)
| Set/get the name of this object for reporting purposes. More...
virtual std::string | GetObjectName () const
| Set/get the name of this object for reporting purposes. More...
Public Member Functions inherited from vtkObjectBase
const char * | GetClassName () const
| Return the class name as a string. More...
virtual vtkIdType | GetNumberOfGenerationsFromBase (const char *name)
| Given the name of a base class of this class type, return the distance of inheritance between this class type and the named class (how many generations of inheritance are there between this class and the named class). More...
virtual void | Delete ()
| Delete a VTK object. More...
virtual void | FastDelete ()
| Delete a reference to this object. More...
void | InitializeObjectBase ()
void | Print (ostream &os)
| Print an object to an ostream. More...
virtual void | Register (vtkObjectBase *o)
| Increase the reference count (mark as used by another object). More...
virtual void | UnRegister (vtkObjectBase *o)
| Decrease the reference count (release by another object). More...
int | GetReferenceCount ()
| Return the current reference count of this object. More...
void | SetReferenceCount (int)
| Sets the reference count. More...
bool | GetIsInMemkind () const
| A local state flag that remembers whether this object lives in the normal or extended memory space. More...
virtual void | PrintHeader (ostream &os, vtkIndent indent)
| Methods invoked by print to print information about the object including superclasses. More...
virtual void | PrintTrailer (ostream &os, vtkIndent indent)
| Methods invoked by print to print information about the object including superclasses. More...
virtual bool | UsesGarbageCollector () const
| Indicate whether the class uses `vtkGarbageCollector` or not. More...

## Static Public Member Functions
static vtkEmptyCell * | New ()
static vtkTypeBool | IsTypeOf (const char *type)
static vtkEmptyCell * | SafeDownCast (vtkObjectBase *o)
Static Public Member Functions inherited from vtkCell
static vtkTypeBool | IsTypeOf (const char *type)
static vtkCell * | SafeDownCast (vtkObjectBase *o)
Static Public Member Functions inherited from vtkObject
static vtkObject * | New ()
| Create an object with Debug turned off, modified time initialized to zero, and reference counting on. More...
static void | BreakOnError ()
| This method is called when vtkErrorMacro executes. More...
static void | SetGlobalWarningDisplay (vtkTypeBool val)
| This is a global flag that controls whether any debug, warning or error messages are displayed. More...
static void | GlobalWarningDisplayOn ()
| This is a global flag that controls whether any debug, warning or error messages are displayed. More...
static void | GlobalWarningDisplayOff ()
| This is a global flag that controls whether any debug, warning or error messages are displayed. More...
static vtkTypeBool | GetGlobalWarningDisplay ()
| This is a global flag that controls whether any debug, warning or error messages are displayed. More...
Static Public Member Functions inherited from vtkObjectBase
static vtkTypeBool | IsTypeOf (const char *name)
| Return 1 if this class type is the same type of (or a subclass of) the named class. More...
static vtkIdType | GetNumberOfGenerationsFromBaseType (const char *name)
| Given a the name of a base class of this class type, return the distance of inheritance between this class type and the named class (how many generations of inheritance are there between this class and the named class). More...
static vtkObjectBase * | New ()
| Create an object with Debug turned off, modified time initialized to zero, and reference counting on. More...
static void | SetMemkindDirectory (const char *directoryname)
| The name of a directory, ideally mounted -o dax, to memory map an extended memory space within. More...
static bool | GetUsingMemkind ()
| A global state flag that controls whether vtkObjects are constructed in the usual way (the default) or within the extended memory space. More...

## Protected Member Functions
virtual vtkObjectBase * | NewInstanceInternal () const
| vtkEmptyCell ()=default
| ~vtkEmptyCell () override=default
Protected Member Functions inherited from vtkCell
| vtkCell ()
| ~vtkCell () override
Protected Member Functions inherited from vtkObject
| vtkObject ()
| ~vtkObject () override
void | RegisterInternal (vtkObjectBase *, vtkTypeBool check) override
void | UnRegisterInternal (vtkObjectBase *, vtkTypeBool check) override
void | InternalGrabFocus (vtkCommand *mouseEvents, vtkCommand *keypressEvents=nullptr)
| These methods allow a command to exclusively grab all events. More...
void | InternalReleaseFocus ()
| These methods allow a command to exclusively grab all events. More...
Protected Member Functions inherited from vtkObjectBase
| vtkObjectBase ()
virtual | ~vtkObjectBase ()
virtual void | ReportReferences (vtkGarbageCollector *)
| vtkObjectBase (const vtkObjectBase &)
void | operator= (const vtkObjectBase &)

## Additional Inherited Members
Public Attributes inherited from vtkCell
vtkPoints * | Points
vtkIdList * | PointIds
Static Protected Member Functions inherited from vtkObjectBase
static vtkMallocingFunction | GetCurrentMallocFunction ()
static vtkReallocingFunction | GetCurrentReallocFunction ()
static vtkFreeingFunction | GetCurrentFreeFunction ()
static vtkFreeingFunction | GetAlternateFreeFunction ()
Protected Attributes inherited from vtkCell
double | Bounds [6]
Protected Attributes inherited from vtkObject
bool | Debug
vtkTimeStamp | MTime
vtkSubjectHelper * | SubjectHelper
std::string | ObjectName
Protected Attributes inherited from vtkObjectBase
std::atomic< int32_t > | ReferenceCount
vtkWeakPointerBase ** | WeakPointers

## Detailed Description

an empty cell used as a place-holder during processing

vtkEmptyCell is a concrete implementation of vtkCell. It is used during processing to represented a deleted element.

Tests:
  vtkEmptyCell (Tests)

Definition at line 21 of file vtkEmptyCell.h.

## Member Typedef Documentation

## ◆ Superclass

typedef vtkCell vtkEmptyCell::Superclass

Definition at line 25 of file vtkEmptyCell.h.

## Constructor & Destructor Documentation

## ◆ vtkEmptyCell()

vtkEmptyCell::vtkEmptyCell | ( |  | ) |
| protecteddefault

## ◆ ~vtkEmptyCell()

vtkEmptyCell::~vtkEmptyCell | ( |  | ) |
| overrideprotecteddefault

## Member Function Documentation

## ◆ New()

static vtkEmptyCell* vtkEmptyCell::New | ( |  | ) |
| static

## ◆ IsTypeOf()

static vtkTypeBool vtkEmptyCell::IsTypeOf | ( | const char * | type | ) |
| static

## ◆ IsA()

virtual vtkTypeBool vtkEmptyCell::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 vtkCell.

## ◆ SafeDownCast()

static vtkEmptyCell* vtkEmptyCell::SafeDownCast | ( | vtkObjectBase * | o | ) |
| static

## ◆ NewInstanceInternal()

virtual vtkObjectBase* vtkEmptyCell::NewInstanceInternal | ( |  | ) | const
| protectedvirtual

Reimplemented from vtkCell.

## ◆ NewInstance()

vtkEmptyCell* vtkEmptyCell::NewInstance | ( |  | ) | const

## ◆ PrintSelf()

void vtkEmptyCell::PrintSelf | ( | ostream & | os,
|  | vtkIndent | indent
| ) |  |
| overridevirtual

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 vtkCell.

## ◆ GetCellType()

int vtkEmptyCell::GetCellType | ( |  | ) |
| inlineoverridevirtual

See the vtkCell API for descriptions of these methods.

Implements vtkCell.

Definition at line 32 of file vtkEmptyCell.h.

## ◆ GetCellDimension()

int vtkEmptyCell::GetCellDimension | ( |  | ) |
| inlineoverridevirtual

See the vtkCell API for descriptions of these methods.

Implements vtkCell.

Definition at line 33 of file vtkEmptyCell.h.

## ◆ GetNumberOfEdges()

int vtkEmptyCell::GetNumberOfEdges | ( |  | ) |
| inlineoverridevirtual

See the vtkCell API for descriptions of these methods.

Implements vtkCell.

Definition at line 34 of file vtkEmptyCell.h.

## ◆ GetNumberOfFaces()

int vtkEmptyCell::GetNumberOfFaces | ( |  | ) |
| inlineoverridevirtual

See the vtkCell API for descriptions of these methods.

Implements vtkCell.

Definition at line 35 of file vtkEmptyCell.h.

## ◆ GetEdge()

vtkCell* vtkEmptyCell::GetEdge | ( | int |  | ) |
| inlineoverridevirtual

See the vtkCell API for descriptions of these methods.

Implements vtkCell.

Definition at line 36 of file vtkEmptyCell.h.

## ◆ GetFace()

vtkCell* vtkEmptyCell::GetFace | ( | int |  | ) |
| inlineoverridevirtual

See the vtkCell API for descriptions of these methods.

Implements vtkCell.

Definition at line 37 of file vtkEmptyCell.h.

## ◆ CellBoundary()

int vtkEmptyCell::CellBoundary | ( | int | subId,
|  | const double | pcoords[3],
|  | vtkIdList * | pts
| ) |  |
| overridevirtual

See the vtkCell API for descriptions of these methods.

Implements vtkCell.

## ◆ Contour()

void vtkEmptyCell::Contour | ( | double | value,
|  | vtkDataArray * | cellScalars,
|  | vtkIncrementalPointLocator * | locator,
|  | vtkCellArray * | verts1,
|  | vtkCellArray * | lines,
|  | vtkCellArray * | verts2,
|  | vtkPointData * | inPd,
|  | vtkPointData * | outPd,
|  | vtkCellData * | inCd,
|  | vtkIdType | cellId,
|  | vtkCellData * | outCd
| ) |  |
| overridevirtual

See the vtkCell API for descriptions of these methods.

Implements vtkCell.

## ◆ Clip()

void vtkEmptyCell::Clip | ( | double | value,
|  | vtkDataArray * | cellScalars,
|  | vtkIncrementalPointLocator * | locator,
|  | vtkCellArray * | pts,
|  | vtkPointData * | inPd,
|  | vtkPointData * | outPd,
|  | vtkCellData * | inCd,
|  | vtkIdType | cellId,
|  | vtkCellData * | outCd,
|  | int | insideOut
| ) |  |
| overridevirtual

See the vtkCell API for descriptions of these methods.

Implements vtkCell.

## ◆ EvaluatePosition()

int vtkEmptyCell::EvaluatePosition | ( | const double | x[3],
|  | double | closestPoint[3],
|  | int & | subId,
|  | double | pcoords[3],
|  | double & | dist2,
|  | double | weights[]
| ) |  |
| overridevirtual

Given a point x[3] return inside(=1), outside(=0) cell, or (-1) computational problem encountered; evaluate parametric coordinates, sub-cell id (!=0 only if cell is composite), distance squared of point x[3] to cell (in particular, the sub-cell indicated), closest point on cell to x[3] (unless closestPoint is null, in which case, the closest point and dist2 are not found), and interpolation weights in cell.

(The number of weights is equal to the number of points defining the cell). Note: on rare occasions a -1 is returned from the method. This means that numerical error has occurred and all data returned from this method should be ignored. Also, inside/outside is determine parametrically. That is, a point is inside if it satisfies parametric limits. This can cause problems for cells of topological dimension 2 or less, since a point in 3D can project onto the cell within parametric limits but be "far" from the cell. Thus the value dist2 may be checked to determine true in/out.

Implements vtkCell.

## ◆ EvaluateLocation()

void vtkEmptyCell::EvaluateLocation | ( | int & | subId,
|  | const double | pcoords[3],
|  | double | x[3],
|  | double * | weights
| ) |  |
| overridevirtual

Determine global coordinate (x[3]) from subId and parametric coordinates.

Also returns interpolation weights. (The number of weights is equal to the number of points in the cell.)

Implements vtkCell.

## ◆ IntersectWithLine()

int vtkEmptyCell::IntersectWithLine | ( | const double | p1[3],
|  | const double | p2[3],
|  | double | tol,
|  | double & | t,
|  | double | x[3],
|  | double | pcoords[3],
|  | int & | subId
| ) |  |
| overridevirtual

Intersect with a ray.

Return parametric coordinates (both line and cell) and global intersection coordinates, given ray definition p1[3], p2[3] and tolerance tol. The method returns non-zero value if intersection occurs. A parametric distance t between 0 and 1 along the ray representing the intersection point, the point coordinates x[3] in data coordinates and also pcoords[3] in parametric coordinates. subId is the index within the cell if a composed cell like a triangle strip.

Implements vtkCell.

## ◆ Triangulate()

int vtkEmptyCell::Triangulate | ( | int | index,
|  | vtkIdList * | ptIds,
|  | vtkPoints * | pts
| ) |  |
| overridevirtual

Generate simplices of proper dimension.

If cell is 3D, tetrahedron are generated; if 2D triangles; if 1D lines; if 0D points. The form of the output is a sequence of points, each n+1 points (where n is topological cell dimension) defining a simplex. The index is a parameter that controls which triangulation to use (if more than one is possible). If numerical degeneracy encountered, 0 is returned, otherwise 1 is returned. This method does not insert new points: all the points that define the simplices are the points that define the cell.

Implements vtkCell.

## ◆ Derivatives()

void vtkEmptyCell::Derivatives | ( | int | subId,
|  | const double | pcoords[3],
|  | const double * | values,
|  | int | dim,
|  | double * | derivs
| ) |  |
| overridevirtual

Compute derivatives given cell subId and parametric coordinates.

The values array is a series of data value(s) at the cell points. There is a one-to-one correspondence between cell point and data value(s). Dim is the number of data values per cell point. Derivs are derivatives in the x-y-z coordinate directions for each data value. Thus, if computing derivatives for a scalar function in a hexahedron, dim=1, 8 values are supplied, and 3 deriv values are returned (i.e., derivatives in x-y-z directions). On the other hand, if computing derivatives of velocity (vx,vy,vz) dim=3, 24 values are supplied ((vx,vy,vz)1, (vx,vy,vz)2, ....()8), and 9 deriv values are returned ((d(vx)/dx),(d(vx)/dy),(d(vx)/dz), (d(vy)/dx),(d(vy)/dy), (d(vy)/dz), (d(vz)/dx),(d(vz)/dy),(d(vz)/dz)).

Implements vtkCell.

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

- Common/DataModel/vtkEmptyCell.h