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/*=========================================================================
Program: Visualization Toolkit
Module: vtkSmoothErrorMetric.h
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
// .NAME vtkSmoothErrorMetric - Objects that compute
// geometry-based error during cell tessellation according to
// some max angle.
//
// .SECTION Description
// 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.
//
// .SECTION See Also
// vtkGenericCellTessellator vtkGenericSubdivisionErrorMetric
#ifndef vtkSmoothErrorMetric_h
#define vtkSmoothErrorMetric_h
#include "vtkCommonDataModelModule.h" // For export macro
#include "vtkGenericSubdivisionErrorMetric.h"
class vtkGenericDataSet;
class VTKCOMMONDATAMODEL_EXPORT vtkSmoothErrorMetric : public vtkGenericSubdivisionErrorMetric
{
public:
// Description:
// Construct the error metric with a default flatness threshold of 90.1
// degrees.
static vtkSmoothErrorMetric *New();
// Description:
// Standard VTK type and error macros.
vtkTypeMacro(vtkSmoothErrorMetric,vtkGenericSubdivisionErrorMetric);
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Return the flatness threshold.
// \post positive_result: result>90 && result<180
double GetAngleTolerance();
// Description:
// 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.
void SetAngleTolerance(double value);
// Description:
// 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)
// \pre leftPoint_exists: leftPoint!=0
// \pre midPoint_exists: midPoint!=0
// \pre rightPoint_exists: rightPoint!=0
// \pre clamped_alpha: alpha>0 && alpha<1
// \pre valid_size: sizeof(leftPoint)=sizeof(midPoint)=sizeof(rightPoint)
// =GetAttributeCollection()->GetNumberOfPointCenteredComponents()+6
int RequiresEdgeSubdivision(double *leftPoint, double *midPoint,
double *rightPoint, double alpha);
// Description:
// 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.
// \pre leftPoint_exists: leftPoint!=0
// \pre midPoint_exists: midPoint!=0
// \pre rightPoint_exists: rightPoint!=0
// \pre clamped_alpha: alpha>0 && alpha<1
// \pre valid_size: sizeof(leftPoint)=sizeof(midPoint)=sizeof(rightPoint)
// =GetAttributeCollection()->GetNumberOfPointCenteredComponents()+6
// \post positive_result: result>=0
double GetError(double *leftPoint, double *midPoint, double *rightPoint,
double alpha);
protected:
vtkSmoothErrorMetric();
virtual ~vtkSmoothErrorMetric();
double AngleTolerance;
double CosTolerance;
private:
vtkSmoothErrorMetric(const vtkSmoothErrorMetric&); // Not implemented.
void operator=(const vtkSmoothErrorMetric&); // Not implemented.
};
#endif
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