/usr/include/libwildmagic/Wm5IntrLine3Ellipsoid3.h is in libwildmagic-dev 5.13-1+b2.
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 | // Geometric Tools, LLC
// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.0.2 (2012/11/03)
#ifndef WM5INTRLINE3ELLIPSOID3_H
#define WM5INTRLINE3ELLIPSOID3_H
#include "Wm5MathematicsLIB.h"
#include "Wm5Intersector.h"
#include "Wm5Line3.h"
#include "Wm5Ellipsoid3.h"
namespace Wm5
{
template <typename Real>
class WM5_MATHEMATICS_ITEM IntrLine3Ellipsoid3
: public Intersector<Real,Vector3<Real> >
{
public:
IntrLine3Ellipsoid3 (const Line3<Real>& line,
const Ellipsoid3<Real>& ellipsoid);
// Object access.
const Line3<Real>& GetLine () const;
const Ellipsoid3<Real>& GetEllipsoid () const;
// Static intersection queries.
virtual bool Test ();
virtual bool Find ();
// The intersection set.
int GetQuantity () const;
const Vector3<Real>& GetPoint (int i) const;
// Small thresholds are used for testing the discriminant of the quadratic
// equation related to the computations: Q(t) = a2*t^2 + 2*a1*t + a0. The
// discriminant is D = a1*a1 - a0*a2. Q(t) has no real-valued roots when
// D < 0, one real-valued root when D = 0, or two real-valued roots when
// D > 0. The code logic involves user-defined thresholds:
// if (D < negThreshold) { no roots (no intersections) }
// else if (D > posThreshold) { two roots (two intersections) }
// else { one root (one intersection) }
// The default values for the thresholds are zero, but you may set them
// to be nonzero (negThreshold <= 0 and posThreshold >= 0). Previously,
// the negative threshold was hard-coded as zero. The positive threshold
// was hard-coded to Math<Real>::ZERO_TOLERANCE, which is not suitable for
// some data sets (i.e. when ellipsoid extents are quite large). The
// default is now zero, so if your application relied on the old behavior,
// you must modify this value.
void SetNegativeThreshold (Real negThreshold);
Real GetNegativeThreshold () const;
void SetPositiveThreshold (Real posThreshold);
Real GetPositiveThreshold () const;
private:
using Intersector<Real,Vector3<Real> >::IT_EMPTY;
using Intersector<Real,Vector3<Real> >::IT_POINT;
using Intersector<Real,Vector3<Real> >::IT_SEGMENT;
using Intersector<Real,Vector3<Real> >::mIntersectionType;
// The objects to intersect.
const Line3<Real>* mLine;
const Ellipsoid3<Real>* mEllipsoid;
// Information about the intersection set.
int mQuantity;
Vector3<Real> mPoint[2];
// For testing the discriminant. The default values are zero. You may
// set the negative threshold to a (small) negative number and the
// positive threshold to a (small) positive number.
Real mNegativeThreshold;
Real mPositiveThreshold;
};
typedef IntrLine3Ellipsoid3<float> IntrLine3Ellipsoid3f;
typedef IntrLine3Ellipsoid3<double> IntrLine3Ellipsoid3d;
}
#endif
|