/usr/include/libwildmagic/Wm5Plane3.h is in libwildmagic-dev 5.13-1ubuntu1.
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// 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: 5.0.0 (2010/01/01)
#ifndef WM5PLANE3_H
#define WM5PLANE3_H
#include "Wm5MathematicsLIB.h"
#include "Wm5Vector3.h"
namespace Wm5
{
template <typename Real>
class Plane3
{
public:
// The plane is represented as Dot(N,X) = c where N is a unit-length
// normal vector, c is the plane constant, and X is any point on the
// plane. The user must ensure that the normal vector is unit length.
// Construction and destruction.
Plane3 (); // uninitialized
~Plane3 ();
// Specify N and c directly.
Plane3 (const Vector3<Real>& normal, Real constant);
// N is specified, c = Dot(N,P) where P is a point on the plane.
Plane3 (const Vector3<Real>& normal, const Vector3<Real>& p);
// N = Cross(P1-P0,P2-P0)/Length(Cross(P1-P0,P2-P0)), c = Dot(N,P0) where
// P0, P1, P2 are points on the plane.
Plane3 (const Vector3<Real>& p0, const Vector3<Real>& p1,
const Vector3<Real>& p2);
// Compute d = Dot(N,P)-c where N is the plane normal and c is the plane
// constant. This is a signed distance. The sign of the return value is
// positive if the point is on the positive side of the plane, negative if
// the point is on the negative side, and zero if the point is on the
// plane.
Real DistanceTo (const Vector3<Real>& p) const;
// The "positive side" of the plane is the half space to which the plane
// normal points. The "negative side" is the other half space. The
// function returns +1 when P is on the positive side, -1 when P is on the
// the negative side, or 0 when P is on the plane.
int WhichSide (const Vector3<Real>& p) const;
Vector3<Real> Normal;
Real Constant;
};
#include "Wm5Plane3.inl"
typedef Plane3<float> Plane3f;
typedef Plane3<double> Plane3d;
}
#endif
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