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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
/**
* @class vtkTriangularTCoords
* @brief 2D texture coordinates based for triangles.
*
* vtkTriangularTCoords is a filter that generates texture coordinates
* for triangles. Texture coordinates for each triangle are:
* (0,0), (1,0) and (.5,sqrt(3)/2). This filter assumes that the triangle
* texture map is symmetric about the center of the triangle. Thus the order
* Of the texture coordinates is not important. The procedural texture
* in vtkTriangularTexture is designed with this symmetry. For more information
* see the paper "Opacity-modulating Triangular Textures for Irregular
* Surfaces," by Penny Rheingans, IEEE Visualization '96, pp. 219-225.
* @sa
* vtkTriangularTexture vtkThresholdPoints vtkTextureMapToPlane
* vtkTextureMapToSphere vtkTextureMapToCylinder
*/
#ifndef vtkTriangularTCoords_h
#define vtkTriangularTCoords_h
#include "vtkFiltersTextureModule.h" // For export macro
#include "vtkPolyDataAlgorithm.h"
VTK_ABI_NAMESPACE_BEGIN
class VTKFILTERSTEXTURE_EXPORT vtkTriangularTCoords : public vtkPolyDataAlgorithm
{
public:
static vtkTriangularTCoords* New();
vtkTypeMacro(vtkTriangularTCoords, vtkPolyDataAlgorithm);
void PrintSelf(ostream& os, vtkIndent indent) override;
protected:
vtkTriangularTCoords() = default;
~vtkTriangularTCoords() override = default;
// Usual data generation method
int RequestData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) override;
private:
vtkTriangularTCoords(const vtkTriangularTCoords&) = delete;
void operator=(const vtkTriangularTCoords&) = delete;
};
VTK_ABI_NAMESPACE_END
#endif
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