VTK
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Pages
Protected Member Functions | Protected Attributes | List of all members
vtkGenericSubdivisionErrorMetric Class Referenceabstract

Objects that compute error during cell tessellation. More...

#include <vtkGenericSubdivisionErrorMetric.h>

Inheritance diagram for vtkGenericSubdivisionErrorMetric:
[legend]
Collaboration diagram for vtkGenericSubdivisionErrorMetric:
[legend]

Public Member Functions

virtual int RequiresEdgeSubdivision (double *leftPoint, double *midPoint, double *rightPoint, double alpha)=0
 
virtual double GetError (double *leftPoint, double *midPoint, double *rightPoint, double alpha)=0
 
void SetGenericCell (vtkGenericAdaptorCell *cell)
 
virtual vtkGenericAdaptorCellGetGenericCell ()
 
void SetDataSet (vtkGenericDataSet *ds)
 
virtual vtkGenericDataSet * GetDataSet ()
 

Protected Member Functions

 vtkGenericSubdivisionErrorMetric ()
 
 ~vtkGenericSubdivisionErrorMetric ()
 

Protected Attributes

vtkGenericAdaptorCellGenericCell
 
vtkGenericDataSet * DataSet
 
typedef vtkObject Superclass
 
static int IsTypeOf (const char *type)
 
static
vtkGenericSubdivisionErrorMetric
SafeDownCast (vtkObjectBase *o)
 
virtual int IsA (const char *type)
 
vtkGenericSubdivisionErrorMetricNewInstance () const
 
void PrintSelf (ostream &os, vtkIndent indent)
 
virtual vtkObjectBase * NewInstanceInternal () const
 

Detailed Description

Objects that compute error during cell tessellation.

Objects of that class answer the following question during the cell subdivision: "does the edge need to be subdivided?" through RequiresEdgeSubdivision(). The answer depends on the criterium actually used in the subclass of this abstract class: a geometric-based error metric (variation of edge from a straight line), an attribute-based error metric (variation of the active attribute/component value from a linear ramp) , a view-depend error metric, ... Cell subdivision is performed in the context of the adaptor framework: higher-order, or complex cells, are automatically tessellated into simplices so that they can be processed with conventional visualization algorithms.

See Also
vtkGenericCellTessellator

Definition at line 47 of file vtkGenericSubdivisionErrorMetric.h.

Member Typedef Documentation

Standard VTK type and error macros.

Definition at line 52 of file vtkGenericSubdivisionErrorMetric.h.

Constructor & Destructor Documentation

vtkGenericSubdivisionErrorMetric::vtkGenericSubdivisionErrorMetric ( )
protected
vtkGenericSubdivisionErrorMetric::~vtkGenericSubdivisionErrorMetric ( )
protected

Member Function Documentation

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

Standard VTK type and error macros.

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

Standard VTK type and error macros.

Reimplemented in vtkSmoothErrorMetric, and vtkGeometricErrorMetric.

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

Standard VTK type and error macros.

virtual vtkObjectBase* vtkGenericSubdivisionErrorMetric::NewInstanceInternal ( ) const
protectedvirtual

Standard VTK type and error macros.

Reimplemented in vtkSmoothErrorMetric, and vtkGeometricErrorMetric.

vtkGenericSubdivisionErrorMetric* vtkGenericSubdivisionErrorMetric::NewInstance ( ) const

Standard VTK type and error macros.

void vtkGenericSubdivisionErrorMetric::PrintSelf ( ostream &  os,
vtkIndent  indent 
)

Standard VTK type and error macros.

virtual int vtkGenericSubdivisionErrorMetric::RequiresEdgeSubdivision ( double *  leftPoint,
double *  midPoint,
double *  rightPoint,
double  alpha 
)
pure virtual

Does the edge need to be subdivided according to the implemented computation? The edge is defined by its `leftPoint' and its `rightPoint'. `leftPoint', `midPoint' and `rightPoint' have to be initialized before calling RequiresEdgeSubdivision(). Their format is global coordinates, parametric coordinates and point centered attributes: xyx rst abc de... `alpha' is the normalized abscissa of the midpoint along the edge. (close to 0 means close to the left point, close to 1 means close to the right point)

Precondition
leftPoint_exists: leftPoint!=0
midPoint_exists: midPoint!=0
rightPoint_exists: rightPoint!=0
clamped_alpha: alpha>0 && alpha<1
valid_size: sizeof(leftPoint)=sizeof(midPoint)=sizeof(rightPoint) =GetAttributeCollection()->GetNumberOfPointCenteredComponents()+6

Implemented in vtkGeometricErrorMetric, and vtkSmoothErrorMetric.

virtual double vtkGenericSubdivisionErrorMetric::GetError ( double *  leftPoint,
double *  midPoint,
double *  rightPoint,
double  alpha 
)
pure virtual

Return the error at the mid-point. The type of error depends on the state of the concrete error metric. For instance, it can return an absolute or relative error metric. See RequiresEdgeSubdivision() for a description of the arguments.

Precondition
leftPoint_exists: leftPoint!=0
midPoint_exists: midPoint!=0
rightPoint_exists: rightPoint!=0
clamped_alpha: alpha>0 && alpha<1
valid_size: sizeof(leftPoint)=sizeof(midPoint)=sizeof(rightPoint) =GetAttributeCollection()->GetNumberOfPointCenteredComponents()+6
Postcondition
positive_result: result>=0

Implemented in vtkGeometricErrorMetric, and vtkSmoothErrorMetric.

void vtkGenericSubdivisionErrorMetric::SetGenericCell ( vtkGenericAdaptorCell cell)

The cell that the edge belongs to.

virtual vtkGenericAdaptorCell* vtkGenericSubdivisionErrorMetric::GetGenericCell ( )
virtual

The cell that the edge belongs to.

void vtkGenericSubdivisionErrorMetric::SetDataSet ( vtkGenericDataSet *  ds)

Set/Get the dataset to be tessellated.

virtual vtkGenericDataSet* vtkGenericSubdivisionErrorMetric::GetDataSet ( )
virtual

Set/Get the dataset to be tessellated.

Member Data Documentation

vtkGenericAdaptorCell* vtkGenericSubdivisionErrorMetric::GenericCell
protected

Definition at line 104 of file vtkGenericSubdivisionErrorMetric.h.

vtkGenericDataSet* vtkGenericSubdivisionErrorMetric::DataSet
protected

Definition at line 105 of file vtkGenericSubdivisionErrorMetric.h.


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