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107 lines
4.1 KiB
107 lines
4.1 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkSmoothErrorMetric.h,v $
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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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// .NAME vtkSmoothErrorMetric - 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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// .SECTION Description
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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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// .SECTION See Also
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// vtkGenericCellTessellator vtkGenericSubdivisionErrorMetric
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#ifndef __vtkSmoothErrorMetric_h
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#define __vtkSmoothErrorMetric_h
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#include "vtkGenericSubdivisionErrorMetric.h"
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class vtkGenericDataSet;
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class VTK_FILTERING_EXPORT vtkSmoothErrorMetric : public vtkGenericSubdivisionErrorMetric
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{
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public:
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// Description:
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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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static vtkSmoothErrorMetric *New();
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// Description:
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// Standard VTK type and error macros.
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vtkTypeRevisionMacro(vtkSmoothErrorMetric,vtkGenericSubdivisionErrorMetric);
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void PrintSelf(ostream& os, vtkIndent indent);
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// Description:
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// Return the flatness threshold.
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// \post positive_result: result>90 && result<180
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double GetAngleTolerance();
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// Description:
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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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void SetAngleTolerance(double value);
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// Description:
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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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int RequiresEdgeSubdivision(double *leftPoint, double *midPoint,
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double *rightPoint, double alpha);
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// Description:
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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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double GetError(double *leftPoint, double *midPoint, double *rightPoint,
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double alpha);
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protected:
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vtkSmoothErrorMetric();
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virtual ~vtkSmoothErrorMetric();
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double AngleTolerance;
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double CosTolerance;
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private:
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vtkSmoothErrorMetric(const vtkSmoothErrorMetric&); // Not implemented.
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void operator=(const vtkSmoothErrorMetric&); // Not implemented.
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};
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#endif
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