vtkGenericSubdivisionErrorMetric Class Reference

#include <vtkGenericSubdivisionErrorMetric.h>

Inheritance diagram for vtkGenericSubdivisionErrorMetric:

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Collaboration diagram for vtkGenericSubdivisionErrorMetric:

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List of all members.


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 46 of file vtkGenericSubdivisionErrorMetric.h.

typedef vtkObject Superclass
virtual const char * GetClassName ()
virtual int IsA (const char *type)
void PrintSelf (ostream &os, vtkIndent indent)
static int IsTypeOf (const char *type)
static
vtkGenericSubdivisionErrorMetric
SafeDownCast (vtkObject *o)

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 vtkGenericDataSetGetDataSet ()

Protected Member Functions

 vtkGenericSubdivisionErrorMetric ()
 ~vtkGenericSubdivisionErrorMetric ()

Protected Attributes

vtkGenericAdaptorCellGenericCell
vtkGenericDataSetDataSet

Member Typedef Documentation

Standard VTK type and error macros.

Reimplemented from vtkObject.

Reimplemented in vtkAttributesErrorMetric, vtkGeometricErrorMetric, vtkSmoothErrorMetric, and vtkViewDependentErrorMetric.

Definition at line 51 of file vtkGenericSubdivisionErrorMetric.h.


Constructor & Destructor Documentation

vtkGenericSubdivisionErrorMetric::vtkGenericSubdivisionErrorMetric (  )  [protected]

vtkGenericSubdivisionErrorMetric::~vtkGenericSubdivisionErrorMetric (  )  [protected]


Member Function Documentation

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

Standard VTK type and error macros.

Reimplemented from vtkObject.

Reimplemented in vtkAttributesErrorMetric, vtkGeometricErrorMetric, vtkSmoothErrorMetric, and vtkViewDependentErrorMetric.

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

Standard VTK type and error macros.

Reimplemented from vtkObject.

Reimplemented in vtkAttributesErrorMetric, vtkGeometricErrorMetric, vtkSmoothErrorMetric, and vtkViewDependentErrorMetric.

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

Standard VTK type and error macros.

Reimplemented from vtkObject.

Reimplemented in vtkAttributesErrorMetric, vtkGeometricErrorMetric, vtkSmoothErrorMetric, and vtkViewDependentErrorMetric.

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

Standard VTK type and error macros.

Reimplemented from vtkObject.

Reimplemented in vtkAttributesErrorMetric, vtkGeometricErrorMetric, vtkSmoothErrorMetric, and vtkViewDependentErrorMetric.

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

Standard VTK type and error macros.

Reimplemented from vtkObject.

Reimplemented in vtkAttributesErrorMetric, vtkGeometricErrorMetric, vtkSmoothErrorMetric, and vtkViewDependentErrorMetric.

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 vtkAttributesErrorMetric, vtkGeometricErrorMetric, vtkSmoothErrorMetric, and vtkViewDependentErrorMetric.

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 vtkAttributesErrorMetric, vtkGeometricErrorMetric, vtkSmoothErrorMetric, and vtkViewDependentErrorMetric.

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

Definition at line 103 of file vtkGenericSubdivisionErrorMetric.h.

Definition at line 104 of file vtkGenericSubdivisionErrorMetric.h.


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

Generated on Wed Jun 3 19:04:41 2009 for VTK by  doxygen 1.5.6