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 vtkGenericAdaptorCell *	GetGenericCell ()

void	SetDataSet (vtkGenericDataSet *ds)
virtual vtkGenericDataSet *	GetDataSet ()
Protected Member Functions
	vtkGenericSubdivisionErrorMetric ()
	~vtkGenericSubdivisionErrorMetric ()
Protected Attributes
vtkGenericAdaptorCell *	GenericCell
vtkGenericDataSet *	DataSet

Member Typedef Documentation

typedef vtkObject vtkGenericSubdivisionErrorMetric::Superclass

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