vtkDataSetEdgeSubdivisionCriterion Class Reference

#include <vtkDataSetEdgeSubdivisionCriterion.h>

Inheritance diagram for vtkDataSetEdgeSubdivisionCriterion:

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Collaboration diagram for vtkDataSetEdgeSubdivisionCriterion:

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List of all members.


Detailed Description

a subclass of vtkEdgeSubdivisionCriterion for vtkDataSet objects.

$Date$ $Revision$

This is a subclass of vtkEdgeSubdivisionCriterion that is used for tessellating cells of a vtkDataSet, particularly nonlinear cells.

It provides functions for setting the current cell being tessellated and a convenience routine, EvaluateFields() to evaluate field values at a point. You should call EvaluateFields() from inside EvaluateEdge() whenever the result of EvaluateEdge() will be true. Otherwise, do not call EvaluateFields() as the midpoint is about to be discarded. (Implementor's note: This isn't true if UGLY_ASPECT_RATIO_HACK has been defined. But in that case, we don't want the exact field values; we need the linearly interpolated ones at the midpoint for continuity.)

See also:
vtkEdgeSubdivisionCriterion

Definition at line 46 of file vtkDataSetEdgeSubdivisionCriterion.h.


Public Types

typedef vtkEdgeSubdivisionCriterion Superclass

Public Member Functions

virtual const char * GetClassName ()
virtual int IsA (const char *type)
virtual void PrintSelf (ostream &os, vtkIndent indent)
virtual void SetMesh (vtkDataSet *)
vtkDataSetGetMesh ()
const vtkDataSetGetMesh () const
virtual void SetCellId (vtkIdType cell)
vtkIdType GetCellId () const
vtkIdTypeGetCellId ()
vtkCellGetCell ()
const vtkCellGetCell () const
virtual bool EvaluateEdge (const double *p0, double *midpt, const double *p1, int field_start)
double * EvaluateFields (double *vertex, double *weights, int field_start)
virtual void ResetFieldError2 ()
void EvaluatePointDataField (double *result, double *weights, int field)
void EvaluateCellDataField (double *result, double *weights, int field)
virtual void SetChordError2 (double)
virtual double GetChordError2 ()
virtual void SetFieldError2 (int s, double err)
double GetFieldError2 (int s) const
virtual int GetActiveFieldCriteria ()
int GetActiveFieldCriteria () const

Static Public Member Functions

static int IsTypeOf (const char *type)
static
vtkDataSetEdgeSubdivisionCriterion
SafeDownCast (vtkObject *o)
static
vtkDataSetEdgeSubdivisionCriterion
New ()

Protected Member Functions

 vtkDataSetEdgeSubdivisionCriterion ()
virtual ~vtkDataSetEdgeSubdivisionCriterion ()

Protected Attributes

vtkDataSetCurrentMesh
vtkIdType CurrentCellId
vtkCellCurrentCellData
double ChordError2
double * FieldError2
int FieldError2Length
int FieldError2Capacity
int ActiveFieldCriteria

Member Typedef Documentation

Reimplemented from vtkEdgeSubdivisionCriterion.

Definition at line 49 of file vtkDataSetEdgeSubdivisionCriterion.h.


Constructor & Destructor Documentation

vtkDataSetEdgeSubdivisionCriterion::vtkDataSetEdgeSubdivisionCriterion (  )  [protected]

virtual vtkDataSetEdgeSubdivisionCriterion::~vtkDataSetEdgeSubdivisionCriterion (  )  [protected, virtual]


Member Function Documentation

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

Reimplemented from vtkEdgeSubdivisionCriterion.

static int vtkDataSetEdgeSubdivisionCriterion::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 vtkEdgeSubdivisionCriterion.

virtual int vtkDataSetEdgeSubdivisionCriterion::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 vtkEdgeSubdivisionCriterion.

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

Reimplemented from vtkEdgeSubdivisionCriterion.

static vtkDataSetEdgeSubdivisionCriterion* vtkDataSetEdgeSubdivisionCriterion::New (  )  [static]

Create an object with Debug turned off, modified time initialized to zero, and reference counting on.

Reimplemented from vtkObject.

virtual void vtkDataSetEdgeSubdivisionCriterion::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 vtkEdgeSubdivisionCriterion.

virtual void vtkDataSetEdgeSubdivisionCriterion::SetMesh ( vtkDataSet  )  [virtual]

vtkDataSet * vtkDataSetEdgeSubdivisionCriterion::GetMesh (  )  [inline]

Definition at line 164 of file vtkDataSetEdgeSubdivisionCriterion.h.

const vtkDataSet * vtkDataSetEdgeSubdivisionCriterion::GetMesh (  )  const [inline]

Definition at line 165 of file vtkDataSetEdgeSubdivisionCriterion.h.

virtual void vtkDataSetEdgeSubdivisionCriterion::SetCellId ( vtkIdType  cell  )  [virtual]

vtkIdType vtkDataSetEdgeSubdivisionCriterion::GetCellId (  )  const [inline]

Definition at line 162 of file vtkDataSetEdgeSubdivisionCriterion.h.

vtkIdType & vtkDataSetEdgeSubdivisionCriterion::GetCellId (  )  [inline]

Definition at line 161 of file vtkDataSetEdgeSubdivisionCriterion.h.

vtkCell * vtkDataSetEdgeSubdivisionCriterion::GetCell (  )  [inline]

Definition at line 167 of file vtkDataSetEdgeSubdivisionCriterion.h.

const vtkCell * vtkDataSetEdgeSubdivisionCriterion::GetCell (  )  const [inline]

Definition at line 168 of file vtkDataSetEdgeSubdivisionCriterion.h.

virtual bool vtkDataSetEdgeSubdivisionCriterion::EvaluateEdge ( const double *  p0,
double *  p1,
const double *  p2,
int  field_start 
) [virtual]

You must implement this member function in a subclass. It will be called by vtkStreamingTessellator for each edge in each primitive that vtkStreamingTessellator generates.

Implements vtkEdgeSubdivisionCriterion.

double* vtkDataSetEdgeSubdivisionCriterion::EvaluateFields ( double *  vertex,
double *  weights,
int  field_start 
)

Evaluate all of the fields that should be output with the given vertex and store them just past the parametric coordinates of vertex, at the offsets given by vtkEdgeSubdivisionCriterion::GetFieldOffsets() plus field_start. field_start contains the number of world-space coordinates (always 3) plus the embedding dimension (the size of the parameter-space in which the cell is embedded). It will range between 3 and 6, inclusive. You must have called SetCellId() before calling this routine or there will not be a mesh over which to evaluate the fields. You must have called vtkEdgeSubdivisionCriterion::PassDefaultFields() or vtkEdgeSubdivisionCriterion::PassField() or there will be no fields defined for the output vertex. This routine is public and returns its input argument so that it may be used as an argument to vtkStreamingTessellator::AdaptivelySamplekFacet():

	vtkStreamingTessellator* t = vtkStreamingTessellator::New();
	vtkEdgeSubdivisionCriterion* s; ... t->AdaptivelySample1Facet(
	s->EvaluateFields( p0 ), s->EvaluateFields( p1 ) ); ...
	
Although this will work, using EvaluateFields() in this manner should be avoided. It's much more efficient to fetch the corner values for each attribute and copy them into p0, p1, ... as opposed to performing shape function evaluations. The only case where you wouldn't want to do this is when the field you are interpolating is discontinuous at cell borders, such as with a discontinuous galerkin method or when all the Gauss points for quadrature are interior to the cell. The final argument, weights, is the array of weights to apply to each point's data when interpolating the field. This is returned by vtkCell::EvaluateLocation() when evaluating the geometry.

void vtkDataSetEdgeSubdivisionCriterion::EvaluatePointDataField ( double *  result,
double *  weights,
int  field 
)

Evaluate either a cell or nodal field. This exists because of the funky way that Exodus data will be handled. Sure, it's a hack, but what are ya gonna do?

void vtkDataSetEdgeSubdivisionCriterion::EvaluateCellDataField ( double *  result,
double *  weights,
int  field 
)

Evaluate either a cell or nodal field. This exists because of the funky way that Exodus data will be handled. Sure, it's a hack, but what are ya gonna do?

virtual void vtkDataSetEdgeSubdivisionCriterion::SetChordError2 ( double   )  [virtual]

Get/Set the square of the allowable chord error at any edge's midpoint. This value is used by EvaluateEdge.

virtual double vtkDataSetEdgeSubdivisionCriterion::GetChordError2 (  )  [virtual]

Get/Set the square of the allowable chord error at any edge's midpoint. This value is used by EvaluateEdge.

virtual void vtkDataSetEdgeSubdivisionCriterion::SetFieldError2 ( int  s,
double  err 
) [virtual]

Get/Set the square of the allowable error magnitude for the scalar field s at any edge's midpoint. A value less than or equal to 0 indicates that the field should not be used as a criterion for subdivision.

double vtkDataSetEdgeSubdivisionCriterion::GetFieldError2 ( int  s  )  const

Get/Set the square of the allowable error magnitude for the scalar field s at any edge's midpoint. A value less than or equal to 0 indicates that the field should not be used as a criterion for subdivision.

virtual void vtkDataSetEdgeSubdivisionCriterion::ResetFieldError2 (  )  [virtual]

Tell the subdivider not to use any field values as subdivision criteria. Effectively calls SetFieldError2( a, -1. ) for all fields.

virtual int vtkDataSetEdgeSubdivisionCriterion::GetActiveFieldCriteria (  )  [virtual]

Return a bitfield specifying which FieldError2 criteria are positive (i.e., actively used to decide edge subdivisions). This is stored as separate state to make subdivisions go faster.

int vtkDataSetEdgeSubdivisionCriterion::GetActiveFieldCriteria (  )  const [inline]

Return a bitfield specifying which FieldError2 criteria are positive (i.e., actively used to decide edge subdivisions). This is stored as separate state to make subdivisions go faster.

Definition at line 136 of file vtkDataSetEdgeSubdivisionCriterion.h.


Member Data Documentation

Definition at line 143 of file vtkDataSetEdgeSubdivisionCriterion.h.

Definition at line 144 of file vtkDataSetEdgeSubdivisionCriterion.h.

Definition at line 145 of file vtkDataSetEdgeSubdivisionCriterion.h.

Definition at line 147 of file vtkDataSetEdgeSubdivisionCriterion.h.

Definition at line 148 of file vtkDataSetEdgeSubdivisionCriterion.h.

Definition at line 149 of file vtkDataSetEdgeSubdivisionCriterion.h.

Definition at line 150 of file vtkDataSetEdgeSubdivisionCriterion.h.

Definition at line 151 of file vtkDataSetEdgeSubdivisionCriterion.h.


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

Generated on Wed Aug 24 11:33:16 2011 for VTK by  doxygen 1.5.6