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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.
=========================================================================*/
/**
* @class vtkSmoothErrorMetric
* @brief 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.
*
* @sa
* 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:
/**
* Construct the error metric with a default flatness threshold of 90.1
* degrees.
*/
static vtkSmoothErrorMetric* New();
//@{
/**
* Standard VTK type and error macros.
*/
vtkTypeMacro(vtkSmoothErrorMetric, vtkGenericSubdivisionErrorMetric);
void PrintSelf(ostream& os, vtkIndent indent) override;
//@}
/**
* Return the flatness threshold.
* \post positive_result: result>90 && result<180
*/
double GetAngleTolerance();
/**
* 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);
/**
* 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) override;
/**
* 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) override;
protected:
vtkSmoothErrorMetric();
~vtkSmoothErrorMetric() override;
double AngleTolerance;
double CosTolerance;
private:
vtkSmoothErrorMetric(const vtkSmoothErrorMetric&) = delete;
void operator=(const vtkSmoothErrorMetric&) = delete;
};
#endif
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