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