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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
/**
* @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 "vtkApproximatingSubdivisionFilter.h"
#include "vtkFiltersModelingModule.h" // For export macro
VTK_ABI_NAMESPACE_BEGIN
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);
void PrintSelf(ostream& os, vtkIndent indent) override;
///@}
protected:
vtkLoopSubdivisionFilter() = default;
~vtkLoopSubdivisionFilter() override = default;
int GenerateSubdivisionPoints(vtkPolyData* inputDS, vtkIntArray* edgeData, vtkPoints* outputPts,
vtkPointData* outputPD) override;
int GenerateEvenStencil(vtkIdType p1, vtkPolyData* polys, vtkIdList* stencilIds, double* weights);
void GenerateOddStencil(
vtkIdType p1, vtkIdType p2, vtkPolyData* polys, vtkIdList* stencilIds, double* weights);
int RequestUpdateExtent(vtkInformation*, vtkInformationVector**, vtkInformationVector*) override;
private:
vtkLoopSubdivisionFilter(const vtkLoopSubdivisionFilter&) = delete;
void operator=(const vtkLoopSubdivisionFilter&) = delete;
};
VTK_ABI_NAMESPACE_END
#endif
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