vec Ray::ClosestPoint(const LineSegment &other, float &d, float &d2) const
{
Line::ClosestPointLineLine(pos, dir, other.a, other.b - other.a, d, d2);
if (d < 0.f)
{
d = 0.f;
if (d2 >= 0.f && d2 <= 1.f)
{
other.ClosestPoint(pos, d2);
return pos;
}
vec p;
float t2;
if (d2 < 0.f)
{
p = other.a;
t2 = 0.f;
}
else // u2 > 1.f
{
p = other.b;
t2 = 1.f;
}
vec closestPoint = ClosestPoint(p, d);
vec closestPoint2 = other.ClosestPoint(pos, d2);
if (closestPoint.DistanceSq(p) <= closestPoint2.DistanceSq(pos))
{
d2 = t2;
return closestPoint;
}
else
{
d = 0.f;
return pos;
}
}
else if (d2 < 0.f)
{
d2 = 0.f;
return ClosestPoint(other.a, d);
}
else if (d2 > 1.f)
{
d2 = 1.f;
return ClosestPoint(other.b, d);
}
else
return GetPoint(d);
}
float3 Ray::ClosestPoint(const LineSegment &other, float *d, float *d2) const
{
float u, u2;
float3 closestPoint = Line::ClosestPointLineLine(pos, pos + dir, other.a, other.b, &u, &u2);
if (u < 0.f)
{
if (u2 >= 0.f && u2 <= 1.f)
{
if (d)
*d = 0.f;
if (d2)
other.ClosestPoint(pos, d2);
return pos;
}
float3 p;
float t2;
if (u2 < 0.f)
{
p = other.a;
t2 = 0.f;
}
else // u2 > 1.f
{
p = other.b;
t2 = 1.f;
}
closestPoint = ClosestPoint(p, &u);
float3 closestPoint2 = other.ClosestPoint(pos, &u2);
if (closestPoint.DistanceSq(p) <= closestPoint2.DistanceSq(pos))
{
if (d)
*d = u;
if (d2)
*d2 = t2;
return closestPoint;
}
else
{
if (d)
*d = 0.f;
if (d2)
*d2 = u2;
return pos;
}
}
else if (u2 < 0.f)
{
closestPoint = ClosestPoint(other.a, d);
if (d2)
*d2 = 0.f;
return closestPoint;
}
else if (u2 > 1.f)
{
closestPoint = ClosestPoint(other.b, d);
if (d2)
*d2 = 1.f;
return closestPoint;
}
else
{
if (d)
*d = u;
if (d2)
*d2 = u2;
return closestPoint;
}
}
