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119 lines
4.1 KiB
C++
119 lines
4.1 KiB
C++
/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkSmoothErrorMetric.h
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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/**
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* @class vtkSmoothErrorMetric
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* @brief Objects that compute
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* geometry-based error during cell tessellation according to
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* some max angle.
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*
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*
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* It is a concrete error metric, based on a geometric criterium:
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* a max angle between the chord passing through the midpoint and one of the
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* endpoints and the other chord passing through the midpoint and the other
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* endpoint of the edge. It is related to the flatness of an edge.
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*
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* @sa
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* vtkGenericCellTessellator vtkGenericSubdivisionErrorMetric
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*/
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#ifndef vtkSmoothErrorMetric_h
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#define vtkSmoothErrorMetric_h
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#include "vtkCommonDataModelModule.h" // For export macro
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#include "vtkGenericSubdivisionErrorMetric.h"
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class vtkGenericDataSet;
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class VTKCOMMONDATAMODEL_EXPORT vtkSmoothErrorMetric : public vtkGenericSubdivisionErrorMetric
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{
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public:
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/**
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* Construct the error metric with a default flatness threshold of 90.1
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* degrees.
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*/
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static vtkSmoothErrorMetric* New();
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//@{
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/**
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* Standard VTK type and error macros.
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*/
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vtkTypeMacro(vtkSmoothErrorMetric, vtkGenericSubdivisionErrorMetric);
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void PrintSelf(ostream& os, vtkIndent indent) override;
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//@}
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/**
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* Return the flatness threshold.
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* \post positive_result: result>90 && result<180
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*/
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double GetAngleTolerance();
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/**
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* Set the flatness threshold with an angle in degrees. Internally
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* compute the cosine. value is supposed to be in ]90,180[, if not
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* it is clamped in [90.1,179.9].
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* For instance 178 will give better result than 150.
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*/
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void SetAngleTolerance(double value);
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/**
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* Does the edge need to be subdivided according to the cosine between
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* the two chords passing through the mid-point and the endpoints?
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* The edge is defined by its `leftPoint' and its `rightPoint'.
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* `leftPoint', `midPoint' and `rightPoint' have to be initialized before
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* calling RequiresEdgeSubdivision().
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* Their format is global coordinates, parametric coordinates and
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* point centered attributes: xyx rst abc de...
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* `alpha' is the normalized abscissa of the midpoint along the edge.
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* (close to 0 means close to the left point, close to 1 means close to the
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* right point)
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* \pre leftPoint_exists: leftPoint!=0
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* \pre midPoint_exists: midPoint!=0
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* \pre rightPoint_exists: rightPoint!=0
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* \pre clamped_alpha: alpha>0 && alpha<1
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* \pre valid_size: sizeof(leftPoint)=sizeof(midPoint)=sizeof(rightPoint)
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* =GetAttributeCollection()->GetNumberOfPointCenteredComponents()+6
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*/
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int RequiresEdgeSubdivision(
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double* leftPoint, double* midPoint, double* rightPoint, double alpha) override;
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/**
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* Return the error at the mid-point. It will return an error relative to
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* the bounding box size if GetRelative() is true, a square absolute error
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* otherwise.
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* See RequiresEdgeSubdivision() for a description of the arguments.
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* \pre leftPoint_exists: leftPoint!=0
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* \pre midPoint_exists: midPoint!=0
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* \pre rightPoint_exists: rightPoint!=0
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* \pre clamped_alpha: alpha>0 && alpha<1
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* \pre valid_size: sizeof(leftPoint)=sizeof(midPoint)=sizeof(rightPoint)
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* =GetAttributeCollection()->GetNumberOfPointCenteredComponents()+6
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* \post positive_result: result>=0
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*/
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double GetError(double* leftPoint, double* midPoint, double* rightPoint, double alpha) override;
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protected:
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vtkSmoothErrorMetric();
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~vtkSmoothErrorMetric() override;
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double AngleTolerance;
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double CosTolerance;
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private:
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vtkSmoothErrorMetric(const vtkSmoothErrorMetric&) = delete;
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void operator=(const vtkSmoothErrorMetric&) = delete;
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};
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#endif
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