vtkCell Class Reference

#include <vtkCell.h>

Inheritance diagram for vtkCell:

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Collaboration diagram for vtkCell:

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List of all members.

Detailed Description

abstract class to specify cell behavior

vtkCell is an abstract class that specifies the interfaces for data cells. Data cells are simple topological elements like points, lines, polygons, and tetrahedra of which visualization datasets are composed. In some cases visualization datasets may explicitly represent cells (e.g., vtkPolyData, vtkUnstructuredGrid), and in some cases, the datasets are implicitly composed of cells (e.g., vtkStructuredPoints).

Warning:: The #define VTK_CELL_SIZE is a parameter used to construct cells and provide a general guideline for controlling object execution. This parameter is not a hard boundary: you can create cells with more points.

See also:: vtkHexahedron vtkLine vtkPixel vtkPolyLine vtkPolyVertex vtkPolygon vtkQuad vtkTetra vtkTriangle vtkTriangleStrip vtkVertex vtkVoxel vtkWedge vtkPyramid

Tests:: vtkCell (Tests)

Definition at line 57 of file vtkCell.h.


Public Types
typedef vtkObject	Superclass
Public Member Functions
virtual const char *	GetClassName ()
virtual int	IsA (const char *type)
void	PrintSelf (ostream &os, vtkIndent indent)
void	Initialize (int npts, vtkIdType pts, vtkPoints p)
virtual void	ShallowCopy (vtkCell *c)
virtual void	DeepCopy (vtkCell *c)
virtual int	GetCellType ()=0
virtual int	GetCellDimension ()=0
virtual int	IsLinear ()
virtual int	IsExplicitCell ()
vtkPoints *	GetPoints ()
vtkIdType	GetNumberOfPoints ()
virtual int	GetNumberOfEdges ()=0
virtual int	GetNumberOfFaces ()=0
vtkIdList *	GetPointIds ()
vtkIdType	GetPointId (int ptId)
virtual vtkCell *	GetEdge (int edgeId)=0
virtual vtkCell *	GetFace (int faceId)=0
virtual int	CellBoundary (int subId, double pcoords[3], vtkIdList *pts)=0
virtual int	Triangulate (int index, vtkIdList ptIds, vtkPoints pts)=0
void	GetBounds (double bounds[6])
double *	GetBounds ()
double	GetLength2 ()
virtual int	GetParametricCenter (double pcoords[3])
virtual double	GetParametricDistance (double pcoords[3])
virtual int	IsPrimaryCell ()
virtual double *	GetParametricCoords ()

virtual int	RequiresInitialization ()
virtual void	Initialize ()

virtual int	EvaluatePosition (double x[3], double closestPoint, int &subId, double pcoords[3], double &dist2, double weights)=0

virtual void	EvaluateLocation (int &subId, double pcoords[3], double x[3], double *weights)=0

virtual void	Contour (double value, vtkDataArray cellScalars, vtkIncrementalPointLocator locator, vtkCellArray verts, vtkCellArray lines, vtkCellArray polys, vtkPointData inPd, vtkPointData outPd, vtkCellData inCd, vtkIdType cellId, vtkCellData *outCd)=0

virtual void	Clip (double value, vtkDataArray cellScalars, vtkIncrementalPointLocator locator, vtkCellArray connectivity, vtkPointData inPd, vtkPointData outPd, vtkCellData inCd, vtkIdType cellId, vtkCellData *outCd, int insideOut)=0

virtual int	IntersectWithLine (double p1[3], double p2[3], double tol, double &t, double x[3], double pcoords[3], int &subId)=0

virtual void	Derivatives (int subId, double pcoords[3], double values, int dim, double derivs)=0

virtual void	InterpolateFunctions (double pcoords[3], double weights[3])
virtual void	InterpolateDerivs (double pcoords[3], double derivs[3])
Static Public Member Functions
static int	IsTypeOf (const char *type)
static vtkCell *	SafeDownCast (vtkObject *o)
Public Attributes
vtkPoints *	Points
vtkIdList *	PointIds
Protected Member Functions
	vtkCell ()
	~vtkCell ()
Protected Attributes
double	Bounds [6]

Member Typedef Documentation

typedef vtkObject vtkCell::Superclass

Reimplemented from vtkObject.

Reimplemented in vtkBiQuadraticQuad, vtkBiQuadraticQuadraticHexahedron, vtkBiQuadraticQuadraticWedge, vtkBiQuadraticTriangle, vtkCell3D, vtkConvexPointSet, vtkCubicLine, vtkEmptyCell, vtkExplicitCell, vtkGenericCell, vtkHexagonalPrism, vtkHexahedron, vtkLine, vtkNonLinearCell, vtkPentagonalPrism, vtkPixel, vtkPolygon, vtkPolyLine, vtkPolyVertex, vtkPyramid, vtkQuad, vtkQuadraticEdge, vtkQuadraticHexahedron, vtkQuadraticLinearQuad, vtkQuadraticLinearWedge, vtkQuadraticPyramid, vtkQuadraticQuad, vtkQuadraticTetra, vtkQuadraticTriangle, vtkQuadraticWedge, vtkTetra, vtkTriangle, vtkTriangleStrip, vtkTriQuadraticHexahedron, vtkVertex, vtkVoxel, and vtkWedge.

Definition at line 60 of file vtkCell.h.

Constructor & Destructor Documentation

vtkCell::vtkCell ( ) [protected]

vtkCell::~vtkCell ( ) [protected]

Member Function Documentation

virtual const char* vtkCell::GetClassName ( ) [virtual]

static int vtkCell::IsTypeOf ( const char * name ) [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 vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkObject.

Reimplemented in vtkBiQuadraticQuad, vtkBiQuadraticQuadraticHexahedron, vtkBiQuadraticQuadraticWedge, vtkBiQuadraticTriangle, vtkCell3D, vtkConvexPointSet, vtkCubicLine, vtkEmptyCell, vtkExplicitCell, vtkGenericCell, vtkHexagonalPrism, vtkHexahedron, vtkLine, vtkNonLinearCell, vtkPentagonalPrism, vtkPixel, vtkPolygon, vtkPolyLine, vtkPolyVertex, vtkPyramid, vtkQuad, vtkQuadraticEdge, vtkQuadraticHexahedron, vtkQuadraticLinearQuad, vtkQuadraticLinearWedge, vtkQuadraticPyramid, vtkQuadraticQuad, vtkQuadraticTetra, vtkQuadraticTriangle, vtkQuadraticWedge, vtkTetra, vtkTriangle, vtkTriangleStrip, vtkTriQuadraticHexahedron, vtkVertex, vtkVoxel, and vtkWedge.

virtual int vtkCell::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 vtkObject.

Reimplemented in vtkBiQuadraticQuad, vtkBiQuadraticQuadraticHexahedron, vtkBiQuadraticQuadraticWedge, vtkBiQuadraticTriangle, vtkCell3D, vtkConvexPointSet, vtkCubicLine, vtkEmptyCell, vtkExplicitCell, vtkGenericCell, vtkHexagonalPrism, vtkHexahedron, vtkLine, vtkNonLinearCell, vtkPentagonalPrism, vtkPixel, vtkPolygon, vtkPolyLine, vtkPolyVertex, vtkPyramid, vtkQuad, vtkQuadraticEdge, vtkQuadraticHexahedron, vtkQuadraticLinearQuad, vtkQuadraticLinearWedge, vtkQuadraticPyramid, vtkQuadraticQuad, vtkQuadraticTetra, vtkQuadraticTriangle, vtkQuadraticWedge, vtkTetra, vtkTriangle, vtkTriangleStrip, vtkTriQuadraticHexahedron, vtkVertex, vtkVoxel, and vtkWedge.

static vtkCell* vtkCell::SafeDownCast ( vtkObject * o ) [static]

void vtkCell::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 vtkObject.

Reimplemented in vtkBiQuadraticQuad, vtkBiQuadraticQuadraticHexahedron, vtkBiQuadraticQuadraticWedge, vtkBiQuadraticTriangle, vtkCell3D, vtkConvexPointSet, vtkCubicLine, vtkEmptyCell, vtkExplicitCell, vtkGenericCell, vtkHexagonalPrism, vtkHexahedron, vtkLine, vtkNonLinearCell, vtkPentagonalPrism, vtkPixel, vtkPolygon, vtkPolyLine, vtkPolyVertex, vtkPyramid, vtkQuad, vtkQuadraticEdge, vtkQuadraticHexahedron, vtkQuadraticLinearQuad, vtkQuadraticLinearWedge, vtkQuadraticPyramid, vtkQuadraticQuad, vtkQuadraticTetra, vtkQuadraticTriangle, vtkQuadraticWedge, vtkTetra, vtkTriangle, vtkTriangleStrip, vtkTriQuadraticHexahedron, vtkVertex, vtkVoxel, and vtkWedge.

void vtkCell::Initialize	(	int	npts,
		vtkIdType *	pts,
		vtkPoints *	p
	)

Initialize cell from outside with point ids and point coordinates specified.

virtual void vtkCell::ShallowCopy ( vtkCell * c ) [virtual]

Copy this cell by reference counting the internal data structures. This is safe if you want a "read-only" copy. If you modify the cell you might wish to use DeepCopy().

Reimplemented in vtkGenericCell.

virtual void vtkCell::DeepCopy ( vtkCell * c ) [virtual]

Copy this cell by completely copying internal data structures. This is slower but safer than ShallowCopy().

Reimplemented in vtkGenericCell.

virtual int vtkCell::GetCellType ( ) [pure virtual]

virtual int vtkCell::GetCellDimension ( ) [pure virtual]

Return the topological dimensional of the cell (0,1,2, or 3).

Implemented in vtkBiQuadraticQuad, vtkBiQuadraticQuadraticHexahedron, vtkBiQuadraticQuadraticWedge, vtkBiQuadraticTriangle, vtkCell3D, vtkCubicLine, vtkEmptyCell, vtkGenericCell, vtkHexagonalPrism, vtkLine, vtkPentagonalPrism, vtkPixel, vtkPolygon, vtkPolyLine, vtkPolyVertex, vtkPyramid, vtkQuad, vtkQuadraticEdge, vtkQuadraticHexahedron, vtkQuadraticLinearQuad, vtkQuadraticLinearWedge, vtkQuadraticPyramid, vtkQuadraticQuad, vtkQuadraticTetra, vtkQuadraticTriangle, vtkQuadraticWedge, vtkTriangle, vtkTriangleStrip, vtkTriQuadraticHexahedron, vtkVertex, vtkVoxel, and vtkWedge.

virtual int vtkCell::IsLinear ( ) [inline, virtual]

Non-linear cells require special treatment beyond the usual cell type and connectivity list information. Most cells in VTK are implicit cells.

Reimplemented in vtkGenericCell, and vtkNonLinearCell.

Definition at line 85 of file vtkCell.h.

virtual int vtkCell::RequiresInitialization ( ) [inline, virtual]

Some cells require initialization prior to access. For example, they may have to triangulate themselves or set up internal data structures.

Reimplemented in vtkConvexPointSet, and vtkGenericCell.

Definition at line 91 of file vtkCell.h.

virtual void vtkCell::Initialize ( ) [inline, virtual]

Some cells require initialization prior to access. For example, they may have to triangulate themselves or set up internal data structures.

Reimplemented in vtkConvexPointSet, and vtkGenericCell.

Definition at line 92 of file vtkCell.h.

virtual int vtkCell::IsExplicitCell ( ) [inline, virtual]

Explicit cells require additional representational information beyond the usual cell type and connectivity list information. Most cells in VTK are implicit cells.

Reimplemented in vtkExplicitCell.

Definition at line 98 of file vtkCell.h.

vtkPoints* vtkCell::GetPoints ( ) [inline]

Get the point coordinates for the cell.

Definition at line 101 of file vtkCell.h.

vtkIdType vtkCell::GetNumberOfPoints ( ) [inline]

Return the number of points in the cell.

Definition at line 104 of file vtkCell.h.

virtual int vtkCell::GetNumberOfEdges ( ) [pure virtual]

virtual int vtkCell::GetNumberOfFaces ( ) [pure virtual]

vtkIdList* vtkCell::GetPointIds ( ) [inline]

Return the list of point ids defining the cell.

Definition at line 113 of file vtkCell.h.

vtkIdType vtkCell::GetPointId ( int ptId ) [inline]

For cell point i, return the actual point id.

Definition at line 116 of file vtkCell.h.

virtual vtkCell* vtkCell::GetEdge ( int edgeId ) [pure virtual]

Return the edge cell from the edgeId of the cell.

Implemented in vtkBiQuadraticQuad, vtkBiQuadraticQuadraticHexahedron, vtkBiQuadraticQuadraticWedge, vtkBiQuadraticTriangle, vtkConvexPointSet, vtkCubicLine, vtkEmptyCell, vtkGenericCell, vtkHexagonalPrism, vtkHexahedron, vtkLine, vtkPentagonalPrism, vtkPixel, vtkPolygon, vtkPyramid, vtkQuad, vtkQuadraticEdge, vtkQuadraticHexahedron, vtkQuadraticLinearQuad, vtkQuadraticLinearWedge, vtkQuadraticPyramid, vtkQuadraticQuad, vtkQuadraticTetra, vtkQuadraticTriangle, vtkQuadraticWedge, vtkTetra, vtkTriangle, vtkTriangleStrip, vtkTriQuadraticHexahedron, vtkVertex, vtkVoxel, and vtkWedge.

virtual vtkCell* vtkCell::GetFace ( int faceId ) [pure virtual]

Return the face cell from the faceId of the cell.

Implemented in vtkBiQuadraticQuad, vtkBiQuadraticQuadraticHexahedron, vtkBiQuadraticQuadraticWedge, vtkBiQuadraticTriangle, vtkConvexPointSet, vtkCubicLine, vtkEmptyCell, vtkGenericCell, vtkHexagonalPrism, vtkHexahedron, vtkLine, vtkPentagonalPrism, vtkPixel, vtkPolygon, vtkPyramid, vtkQuad, vtkQuadraticEdge, vtkQuadraticHexahedron, vtkQuadraticLinearQuad, vtkQuadraticLinearWedge, vtkQuadraticPyramid, vtkQuadraticQuad, vtkQuadraticTetra, vtkQuadraticTriangle, vtkQuadraticWedge, vtkTetra, vtkTriangle, vtkTriQuadraticHexahedron, vtkVertex, vtkVoxel, and vtkWedge.

virtual int vtkCell::CellBoundary	(	int	subId,
		double	pcoords[3],
		vtkIdList *	pts
	)			`[pure virtual]`

Given parametric coordinates of a point, return the closest cell boundary, and whether the point is inside or outside of the cell. The cell boundary is defined by a list of points (pts) that specify a face (3D cell), edge (2D cell), or vertex (1D cell). If the return value of the method is != 0, then the point is inside the cell.

Implemented in vtkBiQuadraticQuad, vtkBiQuadraticQuadraticHexahedron, vtkBiQuadraticQuadraticWedge, vtkBiQuadraticTriangle, vtkConvexPointSet, vtkCubicLine, vtkEmptyCell, vtkGenericCell, vtkHexagonalPrism, vtkHexahedron, vtkLine, vtkPentagonalPrism, vtkPixel, vtkPolygon, vtkPolyLine, vtkPolyVertex, vtkPyramid, vtkQuad, vtkQuadraticEdge, vtkQuadraticHexahedron, vtkQuadraticLinearQuad, vtkQuadraticLinearWedge, vtkQuadraticPyramid, vtkQuadraticQuad, vtkQuadraticTetra, vtkQuadraticTriangle, vtkQuadraticWedge, vtkTetra, vtkTriangle, vtkTriangleStrip, vtkTriQuadraticHexahedron, vtkVertex, vtkVoxel, and vtkWedge.

virtual int vtkCell::EvaluatePosition	(	double	x[3],
		double *	closestPoint,
		int &	subId,
		double	pcoords[3],
		double &	dist2,
		double *	weights
	)			`[pure virtual]`

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.

Implemented in vtkBiQuadraticQuad, vtkBiQuadraticQuadraticHexahedron, vtkBiQuadraticQuadraticWedge, vtkBiQuadraticTriangle, vtkConvexPointSet, vtkCubicLine, vtkEmptyCell, vtkGenericCell, vtkHexagonalPrism, vtkHexahedron, vtkLine, vtkPentagonalPrism, vtkPixel, vtkPolygon, vtkPolyLine, vtkPolyVertex, vtkPyramid, vtkQuad, vtkQuadraticEdge, vtkQuadraticHexahedron, vtkQuadraticLinearQuad, vtkQuadraticLinearWedge, vtkQuadraticPyramid, vtkQuadraticQuad, vtkQuadraticTetra, vtkQuadraticTriangle, vtkQuadraticWedge, vtkTetra, vtkTriangle, vtkTriangleStrip, vtkTriQuadraticHexahedron, vtkVertex, vtkVoxel, and vtkWedge.

virtual void vtkCell::EvaluateLocation	(	int &	subId,
		double	pcoords[3],
		double	x[3],
		double *	weights
	)			`[pure virtual]`

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.)

Implemented in vtkBiQuadraticQuad, vtkBiQuadraticQuadraticHexahedron, vtkBiQuadraticQuadraticWedge, vtkBiQuadraticTriangle, vtkConvexPointSet, vtkCubicLine, vtkEmptyCell, vtkGenericCell, vtkHexagonalPrism, vtkHexahedron, vtkLine, vtkPentagonalPrism, vtkPixel, vtkPolygon, vtkPolyLine, vtkPolyVertex, vtkPyramid, vtkQuad, vtkQuadraticEdge, vtkQuadraticHexahedron, vtkQuadraticLinearQuad, vtkQuadraticLinearWedge, vtkQuadraticPyramid, vtkQuadraticQuad, vtkQuadraticTetra, vtkQuadraticTriangle, vtkQuadraticWedge, vtkTetra, vtkTriangle, vtkTriangleStrip, vtkTriQuadraticHexahedron, vtkVertex, vtkVoxel, and vtkWedge.

virtual void vtkCell::Contour	(	double	value,
		vtkDataArray *	cellScalars,
		vtkIncrementalPointLocator *	locator,
		vtkCellArray *	verts,
		vtkCellArray *	lines,
		vtkCellArray *	polys,
		vtkPointData *	inPd,
		vtkPointData *	outPd,
		vtkCellData *	inCd,
		vtkIdType	cellId,
		vtkCellData *	outCd
	)			`[pure virtual]`

Generate contouring primitives. The scalar list cellScalars are scalar values at each cell point. The point locator is essentially a points list that merges points as they are inserted (i.e., prevents duplicates). Contouring primitives can be vertices, lines, or polygons. It is possible to interpolate point data along the edge by providing input and output point data - if outPd is NULL, then no interpolation is performed. Also, if the output cell data is non-NULL, the cell data from the contoured cell is passed to the generated contouring primitives. (Note: the CopyAllocate() method must be invoked on both the output cell and point data. The cellId refers to the cell from which the cell data is copied.)

Implemented in vtkBiQuadraticQuad, vtkBiQuadraticQuadraticHexahedron, vtkBiQuadraticQuadraticWedge, vtkBiQuadraticTriangle, vtkCell3D, vtkConvexPointSet, vtkCubicLine, vtkEmptyCell, vtkGenericCell, vtkHexahedron, vtkLine, vtkPixel, vtkPolygon, vtkPolyLine, vtkPolyVertex, vtkPyramid, vtkQuad, vtkQuadraticEdge, vtkQuadraticHexahedron, vtkQuadraticLinearQuad, vtkQuadraticLinearWedge, vtkQuadraticPyramid, vtkQuadraticQuad, vtkQuadraticTetra, vtkQuadraticTriangle, vtkQuadraticWedge, vtkTetra, vtkTriangle, vtkTriangleStrip, vtkTriQuadraticHexahedron, vtkVertex, vtkVoxel, and vtkWedge.

virtual void vtkCell::Clip	(	double	value,
		vtkDataArray *	cellScalars,
		vtkIncrementalPointLocator *	locator,
		vtkCellArray *	connectivity,
		vtkPointData *	inPd,
		vtkPointData *	outPd,
		vtkCellData *	inCd,
		vtkIdType	cellId,
		vtkCellData *	outCd,
		int	insideOut
	)			`[pure virtual]`

Cut (or clip) the cell based on the input cellScalars and the specified value. The output of the clip operation will be one or more cells of the same topological dimension as the original cell. The flag insideOut controls what part of the cell is considered inside - normally cell points whose scalar value is greater than "value" are considered inside. If insideOut is on, this is reversed. Also, if the output cell data is non-NULL, the cell data from the clipped cell is passed to the generated contouring primitives. (Note: the CopyAllocate() method must be invoked on both the output cell and point data. The cellId refers to the cell from which the cell data is copied.)

Implemented in vtkBiQuadraticQuad, vtkBiQuadraticQuadraticHexahedron, vtkBiQuadraticQuadraticWedge, vtkBiQuadraticTriangle, vtkCell3D, vtkConvexPointSet, vtkCubicLine, vtkEmptyCell, vtkGenericCell, vtkLine, vtkPixel, vtkPolygon, vtkPolyLine, vtkPolyVertex, vtkQuad, vtkQuadraticEdge, vtkQuadraticHexahedron, vtkQuadraticLinearQuad, vtkQuadraticLinearWedge, vtkQuadraticPyramid, vtkQuadraticQuad, vtkQuadraticTetra, vtkQuadraticTriangle, vtkQuadraticWedge, vtkTetra, vtkTriangle, vtkTriangleStrip, vtkTriQuadraticHexahedron, and vtkVertex.

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

Intersect with a ray. Return parametric coordinates (both line and cell) and global intersection coordinates, given ray definition and tolerance. The method returns non-zero value if intersection occurs.

Implemented in vtkBiQuadraticQuad, vtkBiQuadraticQuadraticHexahedron, vtkBiQuadraticQuadraticWedge, vtkBiQuadraticTriangle, vtkConvexPointSet, vtkCubicLine, vtkEmptyCell, vtkGenericCell, vtkHexagonalPrism, vtkHexahedron, vtkLine, vtkPentagonalPrism, vtkPixel, vtkPolygon, vtkPolyLine, vtkPolyVertex, vtkPyramid, vtkQuad, vtkQuadraticEdge, vtkQuadraticHexahedron, vtkQuadraticLinearQuad, vtkQuadraticLinearWedge, vtkQuadraticPyramid, vtkQuadraticQuad, vtkQuadraticTetra, vtkQuadraticTriangle, vtkQuadraticWedge, vtkTetra, vtkTriangle, vtkTriangleStrip, vtkTriQuadraticHexahedron, vtkVertex, vtkVoxel, and vtkWedge.

virtual int vtkCell::Triangulate	(	int	index,
		vtkIdList *	ptIds,
		vtkPoints *	pts
	)			`[pure virtual]`

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.

Implemented in vtkBiQuadraticQuad, vtkBiQuadraticQuadraticHexahedron, vtkBiQuadraticQuadraticWedge, vtkBiQuadraticTriangle, vtkConvexPointSet, vtkCubicLine, vtkEmptyCell, vtkGenericCell, vtkHexagonalPrism, vtkHexahedron, vtkLine, vtkPentagonalPrism, vtkPixel, vtkPolygon, vtkPolyLine, vtkPolyVertex, vtkPyramid, vtkQuad, vtkQuadraticEdge, vtkQuadraticHexahedron, vtkQuadraticLinearQuad, vtkQuadraticLinearWedge, vtkQuadraticPyramid, vtkQuadraticQuad, vtkQuadraticTetra, vtkQuadraticTriangle, vtkQuadraticWedge, vtkTetra, vtkTriangle, vtkTriangleStrip, vtkTriQuadraticHexahedron, vtkVertex, vtkVoxel, and vtkWedge.

virtual void vtkCell::Derivatives	(	int	subId,
		double	pcoords[3],
		double *	values,
		int	dim,
		double *	derivs
	)			`[pure virtual]`

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)).

Implemented in vtkBiQuadraticQuad, vtkBiQuadraticQuadraticHexahedron, vtkBiQuadraticQuadraticWedge, vtkBiQuadraticTriangle, vtkConvexPointSet, vtkCubicLine, vtkEmptyCell, vtkGenericCell, vtkHexagonalPrism, vtkHexahedron, vtkLine, vtkPentagonalPrism, vtkPixel, vtkPolygon, vtkPolyLine, vtkPolyVertex, vtkPyramid, vtkQuad, vtkQuadraticEdge, vtkQuadraticHexahedron, vtkQuadraticLinearQuad, vtkQuadraticLinearWedge, vtkQuadraticPyramid, vtkQuadraticQuad, vtkQuadraticTetra, vtkQuadraticTriangle, vtkQuadraticWedge, vtkTetra, vtkTriangle, vtkTriangleStrip, vtkTriQuadraticHexahedron, vtkVertex, vtkVoxel, and vtkWedge.

void vtkCell::GetBounds ( double bounds[6] )

Compute cell bounding box (xmin,xmax,ymin,ymax,zmin,zmax). Copy result into user provided array.

double* vtkCell::GetBounds ( )

Compute cell bounding box (xmin,xmax,ymin,ymax,zmin,zmax). Return pointer to array of six double values.

double vtkCell::GetLength2 ( )

Compute Length squared of cell (i.e., bounding box diagonal squared).

virtual int vtkCell::GetParametricCenter ( double pcoords[3] ) [virtual]

Return center of the cell in parametric coordinates. Note that the parametric center is not always located at (0.5,0.5,0.5). The return value is the subId that the center is in (if a composite cell). If you want the center in x-y-z space, invoke the EvaluateLocation() method.

Reimplemented in vtkBiQuadraticQuad, vtkBiQuadraticQuadraticWedge, vtkBiQuadraticTriangle, vtkConvexPointSet, vtkCubicLine, vtkGenericCell, vtkHexagonalPrism, vtkLine, vtkPentagonalPrism, vtkPixel, vtkPolyLine, vtkPolyVertex, vtkPyramid, vtkQuad, vtkQuadraticEdge, vtkQuadraticLinearQuad, vtkQuadraticLinearWedge, vtkQuadraticPyramid, vtkQuadraticQuad, vtkQuadraticTetra, vtkQuadraticTriangle, vtkQuadraticWedge, vtkTetra, vtkTriangle, vtkTriangleStrip, vtkVertex, and vtkWedge.

virtual double vtkCell::GetParametricDistance ( double pcoords[3] ) [virtual]

Return the distance of the parametric coordinate provided to the cell. If inside the cell, a distance of zero is returned. This is used during picking to get the correct cell picked. (The tolerance will occasionally allow cells to be picked who are not really intersected "inside" the cell.)

Reimplemented in vtkBiQuadraticTriangle, vtkCubicLine, vtkQuadraticTetra, vtkQuadraticTriangle, vtkTetra, and vtkTriangle.

virtual int vtkCell::IsPrimaryCell ( ) [inline, virtual]

Return whether this cell type has a fixed topology or whether the topology varies depending on the data (e.g., vtkConvexPointSet). This compares to composite cells that are typically composed of primary cells (e.g., a triangle strip composite cell is made up of triangle primary cells).

Reimplemented in vtkConvexPointSet, vtkGenericCell, vtkPolygon, vtkPolyLine, vtkPolyVertex, and vtkTriangleStrip.

Definition at line 272 of file vtkCell.h.

virtual double* vtkCell::GetParametricCoords ( ) [virtual]

Return a contiguous array of parametric coordinates of the points defining this cell. In other words, (px,py,pz, px,py,pz, etc..) The coordinates are ordered consistent with the definition of the point ordering for the cell. This method returns a non-NULL pointer when the cell is a primary type (i.e., IsPrimaryCell() is true). Note that 3D parametric coordinates are returned no matter what the topological dimension of the cell.

Reimplemented in vtkBiQuadraticQuad, vtkBiQuadraticQuadraticHexahedron, vtkBiQuadraticQuadraticWedge, vtkBiQuadraticTriangle, vtkConvexPointSet, vtkCubicLine, vtkGenericCell, vtkHexagonalPrism, vtkHexahedron, vtkLine, vtkPentagonalPrism, vtkPixel, vtkPyramid, vtkQuad, vtkQuadraticEdge, vtkQuadraticHexahedron, vtkQuadraticLinearQuad, vtkQuadraticLinearWedge, vtkQuadraticPyramid, vtkQuadraticQuad, vtkQuadraticTetra, vtkQuadraticTriangle, vtkQuadraticWedge, vtkTetra, vtkTriangle, vtkTriQuadraticHexahedron, vtkVertex, vtkVoxel, and vtkWedge.