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)
	Set the squared screen-based geometric accuracy measured in pixels.

int	RequiresEdgeSubdivision (double leftPoint, double midPoint, double *rightPoint, double alpha) override
	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’.

double	GetError (double leftPoint, double midPoint, double *rightPoint, double alpha) override
	Return the error at the mid-point.


virtual double	GetPixelTolerance ()
	Return the squared screen-based geometric accuracy measured in pixels.


virtual vtkViewport *	GetViewport ()
	Set/Get the renderer with ‘renderer’ on which the error metric is based.

void	SetViewport (vtkViewport *viewport)
	Set/Get the renderer with ‘renderer’ on which the error metric is based.

Public Member Functions inherited from vtkGenericSubdivisionErrorMetric
virtual int	RequiresEdgeSubdivision (double leftPoint, double midPoint, double *rightPoint, double alpha)=0
	Does the edge need to be subdivided according to the implemented computation? The edge is defined by its ‘leftPoint’ and its ‘rightPoint’.

virtual double	GetError (double leftPoint, double midPoint, double *rightPoint, double alpha)=0
	Return the error at the mid-point.

void	SetGenericCell (vtkGenericAdaptorCell *cell)
	The cell that the edge belongs to.

virtual vtkGenericAdaptorCell *	GetGenericCell ()
	The cell that the edge belongs to.

void	SetDataSet (vtkGenericDataSet *ds)
	Set/Get the dataset to be tessellated.

virtual vtkGenericDataSet *	GetDataSet ()
	Set/Get the dataset to be tessellated.

vtkGenericSubdivisionErrorMetric *	NewInstance () const
	Standard VTK type and error macros.

Public Member Functions inherited from vtkObject
	vtkBaseTypeMacro (vtkObject, vtkObjectBase)

virtual void	DebugOn ()
	Turn debugging output on.

virtual void	DebugOff ()
	Turn debugging output off.

bool	GetDebug ()
	Get the value of the debug flag.

void	SetDebug (bool debugFlag)
	Set the value of the debug flag.

virtual void	Modified ()
	Update the modification time for this object.

virtual vtkMTimeType	GetMTime ()
	Return this object's modified time.

void	PrintSelf (ostream &os, vtkIndent indent) override
	Methods invoked by print to print information about the object including superclasses.

void	RemoveObserver (unsigned long tag)

void	RemoveObservers (unsigned long event)

void	RemoveObservers (const char *event)

void	RemoveAllObservers ()

vtkTypeBool	HasObserver (unsigned long event)

vtkTypeBool	HasObserver (const char *event)

int	InvokeEvent (unsigned long event)

int	InvokeEvent (const char *event)

unsigned long	AddObserver (unsigned long event, vtkCommand *, float priority=0.0f)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object.

unsigned long	AddObserver (const char event, vtkCommand , float priority=0.0f)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object.

vtkCommand *	GetCommand (unsigned long tag)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object.

void	RemoveObserver (vtkCommand *)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object.

void	RemoveObservers (unsigned long event, vtkCommand *)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object.

void	RemoveObservers (const char event, vtkCommand )
	Allow people to add/remove/invoke observers (callbacks) to any VTK object.

vtkTypeBool	HasObserver (unsigned long event, vtkCommand *)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object.

vtkTypeBool	HasObserver (const char event, vtkCommand )
	Allow people to add/remove/invoke observers (callbacks) to any VTK object.

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, void(T::*callback)(), float priority=0.0f)
	Overloads to AddObserver that allow developers to add class member functions as callbacks for events.

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, void(T::callback)(vtkObject , unsigned long, void *), float priority=0.0f)
	Overloads to AddObserver that allow developers to add class member functions as callbacks for events.

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, bool(T::callback)(vtkObject , unsigned long, void *), float priority=0.0f)
	Allow user to set the AbortFlagOn() with the return value of the callback method.

int	InvokeEvent (unsigned long event, void *callData)
	This method invokes an event and return whether the event was aborted or not.

int	InvokeEvent (const char event, void callData)
	This method invokes an event and return whether the event was aborted or not.

Public Member Functions inherited from vtkObjectBase
const char *	GetClassName () const
	Return the class name as a string.

virtual vtkTypeBool	IsA (const char *name)
	Return 1 if this class is the same type of (or a subclass of) the named class.

virtual vtkIdType	GetNumberOfGenerationsFromBase (const char *name)
	Given the name of a base class of this class type, return the distance of inheritance between this class type and the named class (how many generations of inheritance are there between this class and the named class).

virtual void	Delete ()
	Delete a VTK object.

virtual void	FastDelete ()
	Delete a reference to this object.

void	InitializeObjectBase ()

void	Print (ostream &os)
	Print an object to an ostream.

virtual void	Register (vtkObjectBase *o)
	Increase the reference count (mark as used by another object).

virtual void	UnRegister (vtkObjectBase *o)
	Decrease the reference count (release by another object).

int	GetReferenceCount ()
	Return the current reference count of this object.

void	SetReferenceCount (int)
	Sets the reference count.

bool	GetIsInMemkind () const
	A local state flag that remembers whether this object lives in the normal or extended memory space.

virtual void	PrintHeader (ostream &os, vtkIndent indent)
	Methods invoked by print to print information about the object including superclasses.

virtual void	PrintTrailer (ostream &os, vtkIndent indent)
	Methods invoked by print to print information about the object including superclasses.

Static Public Member Functions
static vtkViewDependentErrorMetric *	New ()
	Construct the error metric with a default squared screen-based geometric accuracy measured in pixels equal to 0.25 (0.5^2).

Static Public Member Functions inherited from vtkGenericSubdivisionErrorMetric
static vtkTypeBool	IsTypeOf (const char *type)
	Standard VTK type and error macros.

static vtkGenericSubdivisionErrorMetric *	SafeDownCast (vtkObjectBase *o)
	Standard VTK type and error macros.

Static Public Member Functions inherited from vtkObject
static vtkObject *	New ()
	Create an object with Debug turned off, modified time initialized to zero, and reference counting on.

static void	BreakOnError ()
	This method is called when vtkErrorMacro executes.

static void	SetGlobalWarningDisplay (int val)
	This is a global flag that controls whether any debug, warning or error messages are displayed.

static void	GlobalWarningDisplayOn ()
	This is a global flag that controls whether any debug, warning or error messages are displayed.

static void	GlobalWarningDisplayOff ()
	This is a global flag that controls whether any debug, warning or error messages are displayed.

static int	GetGlobalWarningDisplay ()
	This is a global flag that controls whether any debug, warning or error messages are displayed.

Static Public Member Functions inherited from vtkObjectBase
static vtkTypeBool	IsTypeOf (const char *name)
	Return 1 if this class type is the same type of (or a subclass of) the named class.

static vtkIdType	GetNumberOfGenerationsFromBaseType (const char *name)
	Given a the name of a base class of this class type, return the distance of inheritance between this class type and the named class (how many generations of inheritance are there between this class and the named class).

static vtkObjectBase *	New ()
	Create an object with Debug turned off, modified time initialized to zero, and reference counting on.

static void	SetMemkindDirectory (const char *directoryname)
	The name of a directory, ideally mounted -o dax, to memory map an extended memory space within.

static bool	GetUsingMemkind ()
	A global state flag that controls whether vtkObjects are constructed in the usual way (the default) or within the extended memory space.

Protected Member Functions
	vtkViewDependentErrorMetric ()

	~vtkViewDependentErrorMetric () override

double	Distance2LinePoint (double x[2], double y[2], double z[2])
	Square distance between a straight line (defined by points x and y) and a point z.

Protected Member Functions inherited from vtkGenericSubdivisionErrorMetric
	vtkGenericSubdivisionErrorMetric ()

	~vtkGenericSubdivisionErrorMetric () override

Protected Member Functions inherited from vtkObject
	vtkObject ()

	~vtkObject () override

void	RegisterInternal (vtkObjectBase *, vtkTypeBool check) override

void	UnRegisterInternal (vtkObjectBase *, vtkTypeBool check) override

void	InternalGrabFocus (vtkCommand mouseEvents, vtkCommand keypressEvents=nullptr)
	These methods allow a command to exclusively grab all events.

void	InternalReleaseFocus ()
	These methods allow a command to exclusively grab all events.

Protected Member Functions inherited from vtkObjectBase
	vtkObjectBase ()

virtual	~vtkObjectBase ()

virtual void	RegisterInternal (vtkObjectBase *, vtkTypeBool check)

virtual void	UnRegisterInternal (vtkObjectBase *, vtkTypeBool check)

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
std::atomic< int32_t >	ReferenceCount

vtkWeakPointerBase **	WeakPointers

typedef vtkGenericSubdivisionErrorMetric	Superclass
	Standard VTK type and error macros.

static vtkTypeBool	IsTypeOf (const char *type)
	Standard VTK type and error macros.

static vtkViewDependentErrorMetric *	SafeDownCast (vtkObjectBase *o)
	Standard VTK type and error macros.

virtual vtkTypeBool	IsA (const char *type)
	Standard VTK type and error macros.

vtkViewDependentErrorMetric *	NewInstance () const
	Standard VTK type and error macros.

void	PrintSelf (ostream &os, vtkIndent indent) override
	Standard VTK type and error macros.

virtual vtkObjectBase *	NewInstanceInternal () const
	Standard VTK type and error macros.

Additional Inherited Members
Public Types inherited from vtkGenericSubdivisionErrorMetric
typedef vtkObject	Superclass
	Standard VTK type and error macros.

Static Protected Member Functions inherited from vtkObjectBase
static vtkMallocingFunction	GetCurrentMallocFunction ()

static vtkReallocingFunction	GetCurrentReallocFunction ()

static vtkFreeingFunction	GetCurrentFreeFunction ()

static vtkFreeingFunction	GetAlternateFreeFunction ()

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

Definition at line 38 of file vtkViewDependentErrorMetric.h.

Member Typedef Documentation

◆ Superclass

typedef vtkGenericSubdivisionErrorMetric vtkViewDependentErrorMetric::Superclass

Standard VTK type and error macros.

Definition at line 51 of file vtkViewDependentErrorMetric.h.

Constructor & Destructor Documentation

◆ vtkViewDependentErrorMetric()

vtkViewDependentErrorMetric::vtkViewDependentErrorMetric ( )

protected

◆ ~vtkViewDependentErrorMetric()

vtkViewDependentErrorMetric::~vtkViewDependentErrorMetric ( )

overrideprotected

Member Function Documentation

◆ New()

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).

◆ IsTypeOf()

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

static

Standard VTK type and error macros.

◆ IsA()

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

virtual

Standard VTK type and error macros.

Reimplemented from vtkGenericSubdivisionErrorMetric.

◆ SafeDownCast()

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

static

Standard VTK type and error macros.

◆ NewInstanceInternal()

virtual vtkObjectBase * vtkViewDependentErrorMetric::NewInstanceInternal ( ) const

protectedvirtual

Standard VTK type and error macros.

Reimplemented from vtkGenericSubdivisionErrorMetric.

◆ NewInstance()

vtkViewDependentErrorMetric * vtkViewDependentErrorMetric::NewInstance ( ) const

Standard VTK type and error macros.

◆ PrintSelf()

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

overridevirtual

Standard VTK type and error macros.

Reimplemented from vtkGenericSubdivisionErrorMetric.

◆ GetPixelTolerance()

virtual double vtkViewDependentErrorMetric::GetPixelTolerance ( )

virtual

Return the squared screen-based geometric accuracy measured in pixels.

An accuracy less or equal to 0.25 (0.5^2) ensures that the screen-space interpolation of a mid-point matches 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

◆ SetPixelTolerance()

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

◆ GetViewport()

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.

◆ SetViewport()

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.

◆ RequiresEdgeSubdivision()

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

overridevirtual

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.

◆ GetError()

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

overridevirtual

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.

◆ Distance2LinePoint()

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.

Member Data Documentation

◆ PixelTolerance

double vtkViewDependentErrorMetric::PixelTolerance

protected

Definition at line 135 of file vtkViewDependentErrorMetric.h.

◆ Viewport

vtkViewport* vtkViewDependentErrorMetric::Viewport

protected

Definition at line 136 of file vtkViewDependentErrorMetric.h.

◆ Coordinate

vtkCoordinate* vtkViewDependentErrorMetric::Coordinate

protected

Definition at line 138 of file vtkViewDependentErrorMetric.h.

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

Rendering/Core/vtkViewDependentErrorMetric.h

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ Superclass

Constructor & Destructor Documentation

◆ vtkViewDependentErrorMetric()

◆ ~vtkViewDependentErrorMetric()

Member Function Documentation

◆ New()

◆ IsTypeOf()

◆ IsA()

◆ SafeDownCast()

◆ NewInstanceInternal()

◆ NewInstance()

◆ PrintSelf()

◆ GetPixelTolerance()

◆ SetPixelTolerance()

◆ GetViewport()

◆ SetViewport()

◆ RequiresEdgeSubdivision()

◆ GetError()

◆ Distance2LinePoint()

Member Data Documentation

◆ PixelTolerance

◆ Viewport

◆ Coordinate