std::pair<bool, vector3> plane::intersection(const line& l)const
{
auto ret = std::make_pair<bool, vector3>(false, vector3());
if (isInPlane(l))
return ret;
ret.first = true;
auto t = (norm_.dotProduct(point_) - norm_.dotProduct(l.start())) / (norm_.dotProduct(l.dir()));
ret.second = l.start() + t * l.dir();
return ret;
}
bool plane::isInPlane(const line& l)const
{
auto dot = norm_.dotProduct(l.dir());
if (!floatEqual(dot, 0.0f))
return false;
return isInPlane(l.start());
}
__HOST____DEVICE__
scalar line<point2D, const point2D&>::nearestDist
(
const line<point2D, const point2D&>& e,
point2D& thisPt,
point2D& edgePt
) const
{
vector2D u = end()-start();
vector2D v = e.end()-e.start();
vector2D w = start()-e.start();
scalar d = u.perp(v);
if (Foam::mag(d) > VSMALL)
{
scalar s = v.perp(w) / d;
if (s <= SMALL)
{
thisPt = start();
}
else if (s >= (1-SMALL))
{
thisPt = end();
}
else
{
thisPt = start()+s*u;
}
scalar t = u.perp(w) / d;
if (t <= SMALL)
{
edgePt = e.start();
}
else if (t >= (1-SMALL))
{
edgePt = e.end();
}
else
{
edgePt = e.start()+t*v;
}
}
else
{
// Parallel lines. Find overlap of both lines by projecting onto
// direction vector (now equal for both lines).
scalar edge0 = e.start() & u;
scalar edge1 = e.end() & u;
bool edgeOrder = edge0 < edge1;
scalar minEdge = (edgeOrder ? edge0 : edge1);
scalar maxEdge = (edgeOrder ? edge1 : edge0);
const point2D& minEdgePt = (edgeOrder ? e.start() : e.end());
const point2D& maxEdgePt = (edgeOrder ? e.end() : e.start());
scalar this0 = start() & u;
scalar this1 = end() & u;
bool thisOrder = this0 < this1;
scalar minThis = min(this0, this1);
scalar maxThis = max(this1, this0);
const point2D& minThisPt = (thisOrder ? start() : end());
const point2D& maxThisPt = (thisOrder ? end() : start());
if (maxEdge < minThis)
{
// edge completely below *this
edgePt = maxEdgePt;
thisPt = minThisPt;
}
else if (maxEdge < maxThis)
{
// maxEdge inside interval of *this
edgePt = maxEdgePt;
thisPt = nearestDist(edgePt).rawPoint();
}
else
{
// maxEdge outside. Check if minEdge inside.
if (minEdge < minThis)
{
// Edge completely envelops this. Take any this point and
// determine nearest on edge.
thisPt = minThisPt;
edgePt = e.nearestDist(thisPt).rawPoint();
}
else if (minEdge < maxThis)
{
// minEdge inside this interval.
edgePt = minEdgePt;
thisPt = nearestDist(edgePt).rawPoint();
}
else
{
// minEdge outside this interval
edgePt = minEdgePt;
thisPt = maxThisPt;
}
}
}
return Foam::mag(thisPt - edgePt);
}
