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/*=========================================================================
Program: Visualization Toolkit
Module: vtkLoopSubdivisionFilter.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 vtkLoopSubdivisionFilter - generate a subdivision surface using the Loop Scheme
// .SECTION Description
// vtkLoopSubdivisionFilter is an approximating subdivision scheme that
// creates four new triangles for each triangle in the mesh. The user can
// specify the NumberOfSubdivisions. Loop's subdivision scheme is
// described in: Loop, C., "Smooth Subdivision surfaces based on
// triangles,", Masters Thesis, University of Utah, August 1987.
// For a nice summary of the technique see, Hoppe, H., et. al,
// "Piecewise Smooth Surface Reconstruction,:, Proceedings of Siggraph 94
// (Orlando, Florida, July 24-29, 1994). In COmputer Graphics
// Proceedings, Annual COnference Series, 1994, ACM SIGGRAPH,
// pp. 295-302.
// <P>
// The filter only operates on triangles. Users should use the
// vtkTriangleFilter to triangulate meshes that contain polygons or
// triangle strips.
// <P>
// The filter approximates point data using the same scheme. New
// triangles create at a subdivision step will have the cell data of
// their parent cell.
// .SECTION Thanks
// This work was supported by PHS Research Grant No. 1 P41 RR13218-01
// from the National Center for Research Resources.
// .SECTION See Also
// vtkApproximatingSubdivisionFilter
#ifndef vtkLoopSubdivisionFilter_h
#define vtkLoopSubdivisionFilter_h
#include "vtkFiltersModelingModule.h" // For export macro
#include "vtkApproximatingSubdivisionFilter.h"
class vtkPolyData;
class vtkIntArray;
class vtkPoints;
class vtkIdList;
class VTKFILTERSMODELING_EXPORT vtkLoopSubdivisionFilter : public vtkApproximatingSubdivisionFilter
{
public:
// Description:
// Construct object with NumberOfSubdivisions set to 1.
static vtkLoopSubdivisionFilter *New();
vtkTypeMacro(vtkLoopSubdivisionFilter,vtkApproximatingSubdivisionFilter);
protected:
vtkLoopSubdivisionFilter () {}
~vtkLoopSubdivisionFilter () {}
virtual int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);
int GenerateSubdivisionPoints (vtkPolyData *inputDS, vtkIntArray *edgeData,
vtkPoints *outputPts,
vtkPointData *outputPD);
void GenerateEvenStencil (vtkIdType p1, vtkPolyData *polys,
vtkIdList *stencilIds, double *weights);
void GenerateOddStencil (vtkIdType p1, vtkIdType p2, vtkPolyData *polys,
vtkIdList *stencilIds, double *weights);
virtual int RequestUpdateExtent(vtkInformation *, vtkInformationVector **, vtkInformationVector *);
private:
vtkLoopSubdivisionFilter(const vtkLoopSubdivisionFilter&); // Not implemented.
void operator=(const vtkLoopSubdivisionFilter&); // Not implemented.
};
#endif
// VTK-HeaderTest-Exclude: vtkLoopSubdivisionFilter.h
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