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/*=========================================================================
Program: Visualization Toolkit
Module: vtkButterflySubdivisionFilter.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 vtkButterflySubdivisionFilter - generate a subdivision surface using the Butterfly Scheme
// .SECTION Description
// vtkButterflySubdivisionFilter is an interpolating subdivision scheme
// that creates four new triangles for each triangle in the mesh. The
// user can specify the NumberOfSubdivisions. This filter implements the
// 8-point butterfly scheme described in: Zorin, D., Schroder, P., and
// Sweldens, W., "Interpolating Subdivisions for Meshes with Arbitrary
// Topology," Computer Graphics Proceedings, Annual Conference Series,
// 1996, ACM SIGGRAPH, pp.189-192. This scheme improves previous
// butterfly subdivisions with special treatment of vertices with valence
// other than 6.
//
// Currently, the filter only operates on triangles. Users should use the
// vtkTriangleFilter to triangulate meshes that contain polygons or
// triangle strips.
//
// The filter interpolates point data using the same scheme. New
// triangles created 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
// vtkInterpolatingSubdivisionFilter vtkLinearSubdivisionFilter
#ifndef vtkButterflySubdivisionFilter_h
#define vtkButterflySubdivisionFilter_h
#include "vtkFiltersModelingModule.h" // For export macro
#include "vtkInterpolatingSubdivisionFilter.h"
class vtkCellArray;
class vtkIdList;
class vtkIntArray;
class VTKFILTERSMODELING_EXPORT vtkButterflySubdivisionFilter : public vtkInterpolatingSubdivisionFilter
{
public:
// Description:
// Construct object with NumberOfSubdivisions set to 1.
static vtkButterflySubdivisionFilter *New();
vtkTypeMacro(vtkButterflySubdivisionFilter,vtkInterpolatingSubdivisionFilter);
protected:
vtkButterflySubdivisionFilter () {}
~vtkButterflySubdivisionFilter () {}
private:
int GenerateSubdivisionPoints(vtkPolyData *inputDS, vtkIntArray *edgeData,
vtkPoints *outputPts, vtkPointData *outputPD);
void GenerateButterflyStencil(vtkIdType p1, vtkIdType p2, vtkPolyData *polys,
vtkIdList *stencilIds, double *weights);
void GenerateLoopStencil(vtkIdType p1, vtkIdType p2, vtkPolyData *polys,
vtkIdList *stencilIds, double *weights);
void GenerateBoundaryStencil(vtkIdType p1, vtkIdType p2, vtkPolyData *polys,
vtkIdList *stencilIds, double *weights);
private:
vtkButterflySubdivisionFilter(const vtkButterflySubdivisionFilter&); // Not implemented.
void operator=(const vtkButterflySubdivisionFilter&); // Not implemented.
};
#endif
// VTK-HeaderTest-Exclude: vtkButterflySubdivisionFilter.h
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