vtkSmoothErrorMetric Class Reference

#include <vtkSmoothErrorMetric.h>

Inheritance diagram for vtkSmoothErrorMetric:

[legend]Collaboration diagram for vtkSmoothErrorMetric:

[legend]List of all members.

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Detailed Description

Objects that compute geometry-based error during cell tessellation according to some max angle.

It is a concrete error metric, based on a geometric criterium: a max angle between the chord passing through the midpoint and one of the endpoints and the other chord passing through the midpoint and the other endpoint of the edge. It is related to the flatness of an edge.

See also:

vtkGenericCellTessellator vtkGenericSubdivisionErrorMetric

Tests:

vtkSmoothErrorMetric (Tests)

Definition at line 40 of file vtkSmoothErrorMetric.h.

typedef vtkGenericSubdivisionErrorMetric	Superclass
virtual const char *	GetClassName ()
virtual int	IsA (const char *type)
void	PrintSelf (ostream &os, vtkIndent indent)
static vtkSmoothErrorMetric *	New ()
static int	IsTypeOf (const char *type)
static vtkSmoothErrorMetric *	SafeDownCast (vtkObject *o)
Public Member Functions
double	GetAngleTolerance ()
void	SetAngleTolerance (double value)
int	RequiresEdgeSubdivision (double *leftPoint, double *midPoint, double *rightPoint, double alpha)
double	GetError (double *leftPoint, double *midPoint, double *rightPoint, double alpha)
Protected Member Functions
	vtkSmoothErrorMetric ()
virtual	~vtkSmoothErrorMetric ()
Protected Attributes
double	AngleTolerance
double	CosTolerance

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Member Typedef Documentation

typedef vtkGenericSubdivisionErrorMetric vtkSmoothErrorMetric::Superclass

Standard VTK type and error macros. Reimplemented from vtkGenericSubdivisionErrorMetric. Definition at line 49 of file vtkSmoothErrorMetric.h.

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Constructor & Destructor Documentation

vtkSmoothErrorMetric::vtkSmoothErrorMetric (   )  [protected]

virtual vtkSmoothErrorMetric::~vtkSmoothErrorMetric (   )  [protected, virtual]

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Member Function Documentation

static vtkSmoothErrorMetric* vtkSmoothErrorMetric::New (   )  [static]

Construct the error metric with a default flatness threshold of 90.1 degrees. Reimplemented from vtkObject.

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

Standard VTK type and error macros. Reimplemented from vtkGenericSubdivisionErrorMetric.

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

Standard VTK type and error macros. Reimplemented from vtkGenericSubdivisionErrorMetric.

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

Standard VTK type and error macros. Reimplemented from vtkGenericSubdivisionErrorMetric.

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

Standard VTK type and error macros. Reimplemented from vtkGenericSubdivisionErrorMetric.

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

Standard VTK type and error macros. Reimplemented from vtkGenericSubdivisionErrorMetric.

double vtkSmoothErrorMetric::GetAngleTolerance (   )

Return the flatness threshold. Postcondition: positive_result: result>90 && result<180

void vtkSmoothErrorMetric::SetAngleTolerance (  double  value  )

Set the flatness threshold with an angle in degrees. Internally compute the cosine. value is supposed to be in ]90,180[, if not it is clamped in [90.1,179.9]. For instance 178 will give better result than 150.

int vtkSmoothErrorMetric::RequiresEdgeSubdivision (  double *  leftPoint, double *  midPoint, double *  rightPoint, double  alpha )  [virtual]

Does the edge need to be subdivided according to the cosine between the two chords passing through the mid-point and the endpoints? 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 vtkSmoothErrorMetric::GetError (  double *  leftPoint, double *  midPoint, double *  rightPoint, double  alpha )  [virtual]

Return the error at the mid-point. It will return an error relative to the bounding box size if GetRelative() is true, a square absolute error otherwise. 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.

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Member Data Documentation

double vtkSmoothErrorMetric::AngleTolerance [protected]

Definition at line 99 of file vtkSmoothErrorMetric.h.

double vtkSmoothErrorMetric::CosTolerance [protected]

Definition at line 100 of file vtkSmoothErrorMetric.h.

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

• dox/Filtering/vtkSmoothErrorMetric.h

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