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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 "Wm5IntrRay2Triangle2.h"
#include "Wm5Intersector1.h"
#include "Wm5IntrLine2Triangle2.h"
namespace Wm5
{
//----------------------------------------------------------------------------
template <typename Real>
IntrRay2Triangle2<Real>::IntrRay2Triangle2 (const Ray2<Real>& ray,
const Triangle2<Real>& triangle)
:
mRay(&ray),
mTriangle(&triangle)
{
}
//----------------------------------------------------------------------------
template <typename Real>
const Ray2<Real>& IntrRay2Triangle2<Real>::GetRay () const
{
return *mRay;
}
//----------------------------------------------------------------------------
template <typename Real>
const Triangle2<Real>& IntrRay2Triangle2<Real>::GetTriangle () const
{
return *mTriangle;
}
//----------------------------------------------------------------------------
template <typename Real>
bool IntrRay2Triangle2<Real>::Test ()
{
Real dist[3];
int sign[3], positive, negative, zero;
IntrLine2Triangle2<Real>::TriangleLineRelations(mRay->Origin,
mRay->Direction, *mTriangle, dist, sign, positive, negative, zero);
if (positive == 3 || negative == 3)
{
mIntersectionType = IT_EMPTY;
}
else
{
Real param[2];
IntrLine2Triangle2<Real>::GetInterval(mRay->Origin,
mRay->Direction, *mTriangle, dist, sign, param);
Intersector1<Real> intr(param[0], param[1], (Real)0,
Math<Real>::MAX_REAL);
intr.Find();
mQuantity = intr.GetNumIntersections();
if (mQuantity == 2)
{
mIntersectionType = IT_SEGMENT;
}
else if (mQuantity == 1)
{
mIntersectionType = IT_POINT;
}
else
{
mIntersectionType = IT_EMPTY;
}
}
return mIntersectionType != IT_EMPTY;
}
//----------------------------------------------------------------------------
template <typename Real>
bool IntrRay2Triangle2<Real>::Find ()
{
Real dist[3];
int sign[3], positive, negative, zero;
IntrLine2Triangle2<Real>::TriangleLineRelations(mRay->Origin,
mRay->Direction, *mTriangle, dist, sign, positive, negative, zero);
if (positive == 3 || negative == 3)
{
// No intersections.
mQuantity = 0;
mIntersectionType = IT_EMPTY;
}
else
{
Real param[2];
IntrLine2Triangle2<Real>::GetInterval(mRay->Origin,
mRay->Direction, *mTriangle, dist, sign, param);
Intersector1<Real> intr(param[0], param[1], (Real)0,
Math<Real>::MAX_REAL);
intr.Find();
mQuantity = intr.GetNumIntersections();
if (mQuantity == 2)
{
// Segment intersection.
mIntersectionType = IT_SEGMENT;
mPoint[0] = mRay->Origin +
intr.GetIntersection(0)*mRay->Direction;
mPoint[1] = mRay->Origin +
intr.GetIntersection(1)*mRay->Direction;
}
else if (mQuantity == 1)
{
// Point intersection.
mIntersectionType = IT_POINT;
mPoint[0] = mRay->Origin +
intr.GetIntersection(0)*mRay->Direction;
}
else
{
// No intersections.
mIntersectionType = IT_EMPTY;
}
}
return mIntersectionType != IT_EMPTY;
}
//----------------------------------------------------------------------------
template <typename Real>
int IntrRay2Triangle2<Real>::GetQuantity () const
{
return mQuantity;
}
//----------------------------------------------------------------------------
template <typename Real>
const Vector2<Real>& IntrRay2Triangle2<Real>::GetPoint (int i) const
{
return mPoint[i];
}
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
// Explicit instantiation.
//----------------------------------------------------------------------------
template WM5_MATHEMATICS_ITEM
class IntrRay2Triangle2<float>;
template WM5_MATHEMATICS_ITEM
class IntrRay2Triangle2<double>;
//----------------------------------------------------------------------------
}
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