/usr/include/vtk-6.3/vtkParametricMobius.h is in libvtk6-dev 6.3.0+dfsg1-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 | /*=========================================================================
Program: Visualization Toolkit
Module: vtkParametricMobius.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.
=========================================================================*/
// .NAME vtkParametricMobius - Generate a Mobius strip.
// .SECTION Description
// vtkParametricMobius generates a Mobius strip.
//
// For further information about this surface, please consult the
// technical description "Parametric surfaces" in http://www.vtk.org/documents.php
// in the "VTK Technical Documents" section in the VTk.org web pages.
//
// .SECTION Thanks
// Andrew Maclean andrew.amaclean@gmail.com for creating and contributing the
// class.
//
#ifndef vtkParametricMobius_h
#define vtkParametricMobius_h
#include "vtkCommonComputationalGeometryModule.h" // For export macro
#include "vtkParametricFunction.h"
class VTKCOMMONCOMPUTATIONALGEOMETRY_EXPORT vtkParametricMobius : public vtkParametricFunction
{
public:
vtkTypeMacro(vtkParametricMobius,vtkParametricFunction);
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Construct a Mobius strip with the following parameters:
// MinimumU = 0, MaximumU = 2*Pi,
// MinimumV = -1, MaximumV = 1,
// JoinU = 1, JoinV = 0,
// TwistU = 0, TwistV = 0,
// ClockwiseOrdering = 1,
// DerivativesAvailable = 1,
// Radius = 1.
static vtkParametricMobius *New();
// Description:
// Set/Get the radius of the Mobius strip. Default is 1.
vtkSetMacro(Radius,double);
vtkGetMacro(Radius,double);
// Description
// Return the parametric dimension of the class.
virtual int GetDimension() {return 2;}
// Description:
// The Mobius strip.
//
// This function performs the mapping \f$f(u,v) \rightarrow (x,y,x)\f$, returning it
// as Pt. It also returns the partial derivatives Du and Dv.
// \f$Pt = (x, y, z), Du = (dx/du, dy/du, dz/du), Dv = (dx/dv, dy/dv, dz/dv)\f$ .
// Then the normal is \f$N = Du X Dv\f$ .
virtual void Evaluate(double uvw[3], double Pt[3], double Duvw[9]);
// Description:
// Calculate a user defined scalar using one or all of uvw, Pt, Duvw.
//
// uvw are the parameters with Pt being the the cartesian point,
// Duvw are the derivatives of this point with respect to u, v and w.
// Pt, Du, Dv are obtained from Evaluate().
//
// This function is only called if the ScalarMode has the value
// vtkParametricFunctionSource::SCALAR_FUNCTION_DEFINED
//
// If the user does not need to calculate a scalar, then the
// instantiated function should return zero.
//
virtual double EvaluateScalar(double uvw[3], double Pt[3], double Duvw[9]);
protected:
vtkParametricMobius();
~vtkParametricMobius();
// Variables
double Radius;
private:
vtkParametricMobius(const vtkParametricMobius&); // Not implemented.
void operator=(const vtkParametricMobius&); // Not implemented.
};
#endif
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