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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.
=========================================================================*/
/**
* @class vtkLoopSubdivisionFilter
* @brief generate a subdivision surface using the Loop Scheme
*
* 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.
*
* @par Thanks:
* This work was supported by PHS Research Grant No. 1 P41 RR13218-01
* from the National Center for Research Resources.
*
* @sa
* 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:
//@{
/**
* 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&) VTK_DELETE_FUNCTION;
void operator=(const vtkLoopSubdivisionFilter&) VTK_DELETE_FUNCTION;
};
#endif
// VTK-HeaderTest-Exclude: vtkLoopSubdivisionFilter.h
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