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vtkSmoothErrorMetric Class Reference

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

#include <vtkSmoothErrorMetric.h>

Inherits vtkGenericSubdivisionErrorMetric.

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)
 

Static Public Member Functions

static vtkSmoothErrorMetricNew ()
 

Protected Member Functions

 vtkSmoothErrorMetric ()
 
virtual ~vtkSmoothErrorMetric ()
 

Protected Attributes

double AngleTolerance
 
double CosTolerance
 
typedef
vtkGenericSubdivisionErrorMetric 
Superclass
 
static int IsTypeOf (const char *type)
 
static vtkSmoothErrorMetricSafeDownCast (vtkObjectBase *o)
 
virtual int IsA (const char *type)
 
vtkSmoothErrorMetricNewInstance () const
 
void PrintSelf (ostream &os, vtkIndent indent)
 
virtual vtkObjectBaseNewInstanceInternal () const
 

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 41 of file vtkSmoothErrorMetric.h.

Member Typedef Documentation

typedef vtkGenericSubdivisionErrorMetric vtkSmoothErrorMetric::Superclass

Standard VTK type and error macros.

Definition at line 50 of file vtkSmoothErrorMetric.h.

Constructor & Destructor Documentation

vtkSmoothErrorMetric::vtkSmoothErrorMetric ( )
protected
virtual vtkSmoothErrorMetric::~vtkSmoothErrorMetric ( )
protectedvirtual

Member Function Documentation

static vtkSmoothErrorMetric* vtkSmoothErrorMetric::New ( )
static

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

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

Standard VTK type and error macros.

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

Standard VTK type and error macros.

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

Standard VTK type and error macros.

virtual vtkObjectBase* vtkSmoothErrorMetric::NewInstanceInternal ( ) const
protectedvirtual

Standard VTK type and error macros.

vtkSmoothErrorMetric* vtkSmoothErrorMetric::NewInstance ( ) const

Standard VTK type and error macros.

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

Standard VTK type and error macros.

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 
)

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

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

Member Data Documentation

double vtkSmoothErrorMetric::AngleTolerance
protected

Definition at line 100 of file vtkSmoothErrorMetric.h.

double vtkSmoothErrorMetric::CosTolerance
protected

Definition at line 101 of file vtkSmoothErrorMetric.h.


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