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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
/**
* @class vtkButterflySubdivisionFilter
* @brief generate a subdivision surface using the Butterfly Scheme
*
* 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.
*
* @par Thanks:
* This work was supported by PHS Research Grant No. 1 P41 RR13218-01
* from the National Center for Research Resources.
*
* @sa
* vtkInterpolatingSubdivisionFilter vtkLinearSubdivisionFilter
*/
#ifndef vtkButterflySubdivisionFilter_h
#define vtkButterflySubdivisionFilter_h
#include "vtkFiltersModelingModule.h" // For export macro
#include "vtkInterpolatingSubdivisionFilter.h"
VTK_ABI_NAMESPACE_BEGIN
class vtkCellArray;
class vtkIdList;
class vtkIntArray;
class VTKFILTERSMODELING_EXPORT vtkButterflySubdivisionFilter
: public vtkInterpolatingSubdivisionFilter
{
public:
///@{
/**
* Construct object with NumberOfSubdivisions set to 1.
*/
static vtkButterflySubdivisionFilter* New();
vtkTypeMacro(vtkButterflySubdivisionFilter, vtkInterpolatingSubdivisionFilter);
void PrintSelf(ostream& os, vtkIndent indent) override;
///@}
protected:
vtkButterflySubdivisionFilter() = default;
~vtkButterflySubdivisionFilter() override = default;
private:
int GenerateSubdivisionPoints(vtkPolyData* inputDS, vtkIntArray* edgeData, vtkPoints* outputPts,
vtkPointData* outputPD) override;
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);
vtkButterflySubdivisionFilter(const vtkButterflySubdivisionFilter&) = delete;
void operator=(const vtkButterflySubdivisionFilter&) = delete;
};
VTK_ABI_NAMESPACE_END
#endif
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