Objects that compute a screen-based error during cell tessellation. More...

#include <vtkViewDependentErrorMetric.h>

Inheritance diagram for vtkViewDependentErrorMetric:

Collaboration diagram for vtkViewDependentErrorMetric:

Public Member Functions
void	SetPixelTolerance (double value)


virtual double	GetPixelTolerance ()


virtual vtkViewport *	GetViewport ()

void	SetViewport (vtkViewport *viewport)


int	RequiresEdgeSubdivision (double leftPoint, double midPoint, double *rightPoint, double alpha)


double	GetError (double leftPoint, double midPoint, double *rightPoint, double alpha)

Public Member Functions inherited from vtkGenericSubdivisionErrorMetric
void	SetGenericCell (vtkGenericAdaptorCell *cell)

virtual vtkGenericAdaptorCell *	GetGenericCell ()

void	SetDataSet (vtkGenericDataSet *ds)

virtual vtkGenericDataSet *	GetDataSet ()

vtkGenericSubdivisionErrorMetric *	NewInstance () const

Public Member Functions inherited from vtkObject
vtkObject *	NewInstance () const

virtual void	DebugOn ()

virtual void	DebugOff ()

bool	GetDebug ()

void	SetDebug (bool debugFlag)

virtual void	Modified ()

virtual unsigned long	GetMTime ()

unsigned long	AddObserver (unsigned long event, vtkCommand *, float priority=0.0f)

unsigned long	AddObserver (const char event, vtkCommand , float priority=0.0f)

vtkCommand *	GetCommand (unsigned long tag)

void	RemoveObserver (vtkCommand *)

void	RemoveObservers (unsigned long event, vtkCommand *)

void	RemoveObservers (const char event, vtkCommand )

int	HasObserver (unsigned long event, vtkCommand *)

int	HasObserver (const char event, vtkCommand )

void	RemoveObserver (unsigned long tag)

void	RemoveObservers (unsigned long event)

void	RemoveObservers (const char *event)

void	RemoveAllObservers ()

int	HasObserver (unsigned long event)

int	HasObserver (const char *event)

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, void(T::*callback)(), float priority=0.0f)

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, void(T::callback)(vtkObject , unsigned long, void *), float priority=0.0f)

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, bool(T::callback)(vtkObject , unsigned long, void *), float priority=0.0f)

int	InvokeEvent (unsigned long event, void *callData)

int	InvokeEvent (const char event, void callData)

int	InvokeEvent (unsigned long event)

int	InvokeEvent (const char *event)

Public Member Functions inherited from vtkObjectBase
const char *	GetClassName () const

virtual void	Delete ()

virtual void	FastDelete ()

void	Print (ostream &os)

virtual void	Register (vtkObjectBase *o)

virtual void	UnRegister (vtkObjectBase *o)

void	SetReferenceCount (int)

void	PrintRevisions (ostream &)

virtual void	PrintHeader (ostream &os, vtkIndent indent)

virtual void	PrintTrailer (ostream &os, vtkIndent indent)

int	GetReferenceCount ()

Static Public Member Functions
static vtkViewDependentErrorMetric *	New ()

Static Public Member Functions inherited from vtkGenericSubdivisionErrorMetric
static int	IsTypeOf (const char *type)

static vtkGenericSubdivisionErrorMetric *	SafeDownCast (vtkObjectBase *o)

Static Public Member Functions inherited from vtkObject
static int	IsTypeOf (const char *type)

static vtkObject *	SafeDownCast (vtkObjectBase *o)

static vtkObject *	New ()

static void	BreakOnError ()

static void	SetGlobalWarningDisplay (int val)

static void	GlobalWarningDisplayOn ()

static void	GlobalWarningDisplayOff ()

static int	GetGlobalWarningDisplay ()

Static Public Member Functions inherited from vtkObjectBase
static int	IsTypeOf (const char *name)

static vtkObjectBase *	New ()

Protected Member Functions
	vtkViewDependentErrorMetric ()

	~vtkViewDependentErrorMetric ()


double	Distance2LinePoint (double x[2], double y[2], double z[2])

Protected Member Functions inherited from vtkGenericSubdivisionErrorMetric
	vtkGenericSubdivisionErrorMetric ()

	~vtkGenericSubdivisionErrorMetric ()

Protected Member Functions inherited from vtkObject
	vtkObject ()

virtual	~vtkObject ()

virtual void	RegisterInternal (vtkObjectBase *, int check)

virtual void	UnRegisterInternal (vtkObjectBase *, int check)

void	InternalGrabFocus (vtkCommand mouseEvents, vtkCommand keypressEvents=NULL)

void	InternalReleaseFocus ()

Protected Member Functions inherited from vtkObjectBase
	vtkObjectBase ()

virtual	~vtkObjectBase ()

virtual void	CollectRevisions (ostream &)

virtual void	ReportReferences (vtkGarbageCollector *)

	vtkObjectBase (const vtkObjectBase &)

void	operator= (const vtkObjectBase &)

Protected Attributes
double	PixelTolerance

vtkViewport *	Viewport

vtkCoordinate *	Coordinate

Protected Attributes inherited from vtkGenericSubdivisionErrorMetric
vtkGenericAdaptorCell *	GenericCell

vtkGenericDataSet *	DataSet

Protected Attributes inherited from vtkObject
bool	Debug

vtkTimeStamp	MTime

vtkSubjectHelper *	SubjectHelper

Protected Attributes inherited from vtkObjectBase
vtkAtomicInt32	ReferenceCount

vtkWeakPointerBase **	WeakPointers

typedef vtkGenericSubdivisionErrorMetric	Superclass

static int	IsTypeOf (const char *type)

static vtkViewDependentErrorMetric *	SafeDownCast (vtkObjectBase *o)

virtual int	IsA (const char *type)

vtkViewDependentErrorMetric *	NewInstance () const

void	PrintSelf (ostream &os, vtkIndent indent)

virtual vtkObjectBase *	NewInstanceInternal () const

Additional Inherited Members
Public Types inherited from vtkGenericSubdivisionErrorMetric
typedef vtkObject	Superclass

Public Types inherited from vtkObject
typedef vtkObjectBase	Superclass

Detailed Description

Objects that compute a screen-based error during cell tessellation.

It is a concrete error metric, based on a geometric criterium in the screen space: the variation of the projected edge from a projected straight line

See also: vtkGenericCellTessellator vtkGenericSubdivisionErrorMetric

Tests:: vtkViewDependentErrorMetric (Tests)

Definition at line 40 of file vtkViewDependentErrorMetric.h.

Member Typedef Documentation

typedef vtkGenericSubdivisionErrorMetric vtkViewDependentErrorMetric::Superclass

Standard VTK type and error macros.

Definition at line 49 of file vtkViewDependentErrorMetric.h.

Constructor & Destructor Documentation

vtkViewDependentErrorMetric::vtkViewDependentErrorMetric ( )

protected

vtkViewDependentErrorMetric::~vtkViewDependentErrorMetric ( )

protected

Member Function Documentation

static vtkViewDependentErrorMetric* vtkViewDependentErrorMetric::New ( )

static

Construct the error metric with a default squared screen-based geometric accuracy measured in pixels equal to 0.25 (0.5^2).

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

static

Standard VTK type and error macros.

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

virtual

Standard VTK type and error macros.

Reimplemented from vtkGenericSubdivisionErrorMetric.

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

static

Standard VTK type and error macros.

virtual vtkObjectBase* vtkViewDependentErrorMetric::NewInstanceInternal ( ) const

protectedvirtual

Standard VTK type and error macros.

Reimplemented from vtkGenericSubdivisionErrorMetric.

vtkViewDependentErrorMetric* vtkViewDependentErrorMetric::NewInstance ( ) const

Standard VTK type and error macros.

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

virtual

Standard VTK type and error macros.

Reimplemented from vtkGenericSubdivisionErrorMetric.

virtual double vtkViewDependentErrorMetric::GetPixelTolerance ( )

virtual

Return the squared screen-based geometric accurary measured in pixels. An accuracy less or equal to 0.25 (0.5^2) ensures that the screen-space interpolation of a mid-point matchs exactly with the projection of the mid-point (a value less than 1 but greater than 0.25 is not enough, because of 8-neighbors). Maybe it is useful for lower accuracy in case of anti-aliasing?

Postcondition: positive_result: result>0

void vtkViewDependentErrorMetric::SetPixelTolerance ( double value )

Set the squared screen-based geometric accuracy measured in pixels. Subdivision will be required if the square distance between the projection of the real point and the straight line passing through the projection of the vertices of the edge is greater than `value'. For instance, 0.25 will give better result than 1.

Precondition: positive_value: value>0

virtual vtkViewport* vtkViewDependentErrorMetric::GetViewport ( )

virtual

Set/Get the renderer with `renderer' on which the error metric is based. The error metric use the active camera of the renderer.

void vtkViewDependentErrorMetric::SetViewport ( vtkViewport * viewport )

Set/Get the renderer with `renderer' on which the error metric is based. The error metric use the active camera of the renderer.

int vtkViewDependentErrorMetric::RequiresEdgeSubdivision	(	double *	leftPoint,
		double *	midPoint,
		double *	rightPoint,
		double	alpha
	)

virtual

Does the edge need to be subdivided according to the distance between the line passing through its endpoints in screen space and the projection of its mid point? 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

Implements vtkGenericSubdivisionErrorMetric.

double vtkViewDependentErrorMetric::GetError	(	double *	leftPoint,
		double *	midPoint,
		double *	rightPoint,
		double	alpha
	)

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

Implements vtkGenericSubdivisionErrorMetric.

double vtkViewDependentErrorMetric::Distance2LinePoint	(	double	x[2],
		double	y[2],
		double	z[2]
	)

protected

Square distance between a straight line (defined by points x and y) and a point z. Property: if x and y are equal, the line is a point and the result is the square distance between points x and z.