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vtkViewDependentErrorMetric Class Reference

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

#include <vtkViewDependentErrorMetric.h>

Inheritance diagram for vtkViewDependentErrorMetric:
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Collaboration diagram for vtkViewDependentErrorMetric:
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Public Types

typedef vtkGenericSubdivisionErrorMetric Superclass
 Standard VTK type and error macros. More...
 
- Public Types inherited from vtkGenericSubdivisionErrorMetric
typedef vtkObject Superclass
 Standard VTK type and error macros. More...
 

Public Member Functions

virtual vtkTypeBool IsA (const char *type)
 Return 1 if this class is the same type of (or a subclass of) the named class. More...
 
vtkViewDependentErrorMetricNewInstance () const
 
void PrintSelf (ostream &os, vtkIndent indent) override
 Methods invoked by print to print information about the object including superclasses. More...
 
virtual double GetPixelTolerance ()
 Return the squared screen-based geometric accuracy measured in pixels. More...
 
void SetPixelTolerance (double value)
 Set the squared screen-based geometric accuracy measured in pixels. More...
 
virtual vtkViewportGetViewport ()
 Set/Get the renderer with ‘renderer’ on which the error metric is based. More...
 
void SetViewport (vtkViewport *viewport)
 
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’. More...
 
double GetError (double *leftPoint, double *midPoint, double *rightPoint, double alpha) override
 Return the error at the mid-point. More...
 
- Public Member Functions inherited from vtkGenericSubdivisionErrorMetric
vtkGenericSubdivisionErrorMetricNewInstance () const
 
void SetGenericCell (vtkGenericAdaptorCell *cell)
 The cell that the edge belongs to. More...
 
virtual vtkGenericAdaptorCellGetGenericCell ()
 
void SetDataSet (vtkGenericDataSet *ds)
 Set/Get the dataset to be tessellated. More...
 
virtual vtkGenericDataSetGetDataSet ()
 
- Public Member Functions inherited from vtkObject
 vtkBaseTypeMacro (vtkObject, vtkObjectBase)
 
virtual void DebugOn ()
 Turn debugging output on. More...
 
virtual void DebugOff ()
 Turn debugging output off. More...
 
bool GetDebug ()
 Get the value of the debug flag. More...
 
void SetDebug (bool debugFlag)
 Set the value of the debug flag. More...
 
virtual void Modified ()
 Update the modification time for this object. More...
 
virtual vtkMTimeType GetMTime ()
 Return this object's modified time. More...
 
unsigned long AddObserver (unsigned long event, vtkCommand *, float priority=0.0f)
 Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...
 
unsigned long AddObserver (const char *event, vtkCommand *, float priority=0.0f)
 
vtkCommandGetCommand (unsigned long tag)
 
void RemoveObserver (vtkCommand *)
 
void RemoveObservers (unsigned long event, vtkCommand *)
 
void RemoveObservers (const char *event, vtkCommand *)
 
vtkTypeBool HasObserver (unsigned long event, vtkCommand *)
 
vtkTypeBool HasObserver (const char *event, vtkCommand *)
 
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)
 
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. More...
 
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)
 Allow user to set the AbortFlagOn() with the return value of the callback method. More...
 
int InvokeEvent (unsigned long event, void *callData)
 This method invokes an event and return whether the event was aborted or not. More...
 
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
 Return the class name as a string. More...
 
virtual void Delete ()
 Delete a VTK object. More...
 
virtual void FastDelete ()
 Delete a reference to this object. More...
 
void InitializeObjectBase ()
 
void Print (ostream &os)
 Print an object to an ostream. More...
 
virtual void PrintHeader (ostream &os, vtkIndent indent)
 
virtual void PrintTrailer (ostream &os, vtkIndent indent)
 
virtual void Register (vtkObjectBase *o)
 Increase the reference count (mark as used by another object). More...
 
virtual void UnRegister (vtkObjectBase *o)
 Decrease the reference count (release by another object). More...
 
int GetReferenceCount ()
 Return the current reference count of this object. More...
 
void SetReferenceCount (int)
 Sets the reference count. More...
 
void PrintRevisions (ostream &)
 Legacy. More...
 

Static Public Member Functions

static vtkViewDependentErrorMetricNew ()
 Construct the error metric with a default squared screen-based geometric accuracy measured in pixels equal to 0.25 (0.5^2). More...
 
static vtkTypeBool IsTypeOf (const char *type)
 
static vtkViewDependentErrorMetricSafeDownCast (vtkObjectBase *o)
 
- Static Public Member Functions inherited from vtkGenericSubdivisionErrorMetric
static vtkTypeBool IsTypeOf (const char *type)
 
static vtkGenericSubdivisionErrorMetricSafeDownCast (vtkObjectBase *o)
 
- Static Public Member Functions inherited from vtkObject
static vtkObjectNew ()
 Create an object with Debug turned off, modified time initialized to zero, and reference counting on. More...
 
static void BreakOnError ()
 This method is called when vtkErrorMacro executes. More...
 
static void SetGlobalWarningDisplay (int val)
 This is a global flag that controls whether any debug, warning or error messages are displayed. More...
 
static void GlobalWarningDisplayOn ()
 
static void GlobalWarningDisplayOff ()
 
static int GetGlobalWarningDisplay ()
 
- 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. More...
 
static vtkObjectBaseNew ()
 Create an object with Debug turned off, modified time initialized to zero, and reference counting on. More...
 

Protected Member Functions

virtual vtkObjectBaseNewInstanceInternal () const
 
 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. More...
 
- 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. More...
 
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
 
vtkViewportViewport
 
vtkCoordinateCoordinate
 
- Protected Attributes inherited from vtkGenericSubdivisionErrorMetric
vtkGenericAdaptorCellGenericCell
 
vtkGenericDataSetDataSet
 
- Protected Attributes inherited from vtkObject
bool Debug
 
vtkTimeStamp MTime
 
vtkSubjectHelper * SubjectHelper
 
- Protected Attributes inherited from vtkObjectBase
std::atomic< int32_t > ReferenceCount
 
vtkWeakPointerBase ** WeakPointers
 

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 41 of file vtkViewDependentErrorMetric.h.

Member Typedef Documentation

◆ Superclass

Standard VTK type and error macros.

Definition at line 54 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

◆ IsA()

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

Return 1 if this class is the same type of (or a subclass of) the named class.

Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkGenericSubdivisionErrorMetric.

◆ SafeDownCast()

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

◆ NewInstanceInternal()

virtual vtkObjectBase* vtkViewDependentErrorMetric::NewInstanceInternal ( ) const
protectedvirtual

Reimplemented from vtkGenericSubdivisionErrorMetric.

◆ NewInstance()

vtkViewDependentErrorMetric* vtkViewDependentErrorMetric::NewInstance ( ) const

◆ PrintSelf()

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

Methods invoked by print to print information about the object including superclasses.

Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

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)

◆ 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 141 of file vtkViewDependentErrorMetric.h.

◆ Viewport

vtkViewport* vtkViewDependentErrorMetric::Viewport
protected

Definition at line 142 of file vtkViewDependentErrorMetric.h.

◆ Coordinate

vtkCoordinate* vtkViewDependentErrorMetric::Coordinate
protected

Definition at line 144 of file vtkViewDependentErrorMetric.h.


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