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// 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: 5.0.1 (2010/10/01)
#include "Wm5MathematicsPCH.h"
#include "Wm5IntrLine3Plane3.h"
namespace Wm5
{
//----------------------------------------------------------------------------
template <typename Real>
IntrLine3Plane3<Real>::IntrLine3Plane3 (const Line3<Real>& line,
const Plane3<Real>& plane)
:
mLine(&line),
mPlane(&plane)
{
}
//----------------------------------------------------------------------------
template <typename Real>
const Line3<Real>& IntrLine3Plane3<Real>::GetLine () const
{
return *mLine;
}
//----------------------------------------------------------------------------
template <typename Real>
const Plane3<Real>& IntrLine3Plane3<Real>::GetPlane () const
{
return *mPlane;
}
//----------------------------------------------------------------------------
template <typename Real>
bool IntrLine3Plane3<Real>::Test ()
{
Real DdN = mLine->Direction.Dot(mPlane->Normal);
if (Math<Real>::FAbs(DdN) > Math<Real>::ZERO_TOLERANCE)
{
// The line is not parallel to the plane, so they must intersect.
// The line parameter is *not* set, since this is a test-intersection
// query.
mIntersectionType = IT_POINT;
return true;
}
// The line and plane are parallel. Determine if they are numerically
// close enough to be coincident.
Real signedDistance = mPlane->DistanceTo(mLine->Origin);
if (Math<Real>::FAbs(signedDistance) <= Math<Real>::ZERO_TOLERANCE)
{
mIntersectionType = IT_LINE;
return true;
}
mIntersectionType = IT_EMPTY;
return false;
}
//----------------------------------------------------------------------------
template <typename Real>
bool IntrLine3Plane3<Real>::Find ()
{
Real DdN = mLine->Direction.Dot(mPlane->Normal);
Real signedDistance = mPlane->DistanceTo(mLine->Origin);
if (Math<Real>::FAbs(DdN) > Math<Real>::ZERO_TOLERANCE)
{
// The line is not parallel to the plane, so they must intersect.
mLineParameter = -signedDistance/DdN;
mIntersectionType = IT_POINT;
return true;
}
// The Line and plane are parallel. Determine if they are numerically
// close enough to be coincident.
if (Math<Real>::FAbs(signedDistance) <= Math<Real>::ZERO_TOLERANCE)
{
// The line is coincident with the plane, so choose t = 0 for the
// parameter.
mLineParameter = (Real)0;
mIntersectionType = IT_LINE;
return true;
}
mIntersectionType = IT_EMPTY;
return false;
}
//----------------------------------------------------------------------------
template <typename Real>
Real IntrLine3Plane3<Real>::GetLineParameter () const
{
return mLineParameter;
}
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
// Explicit instantiation.
//----------------------------------------------------------------------------
template WM5_MATHEMATICS_ITEM
class IntrLine3Plane3<float>;
template WM5_MATHEMATICS_ITEM
class IntrLine3Plane3<double>;
//----------------------------------------------------------------------------
}
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