// see http://slidegur.com/doc/1106443/plucker-coordinate slide 46
// "inside" if U1.V2 + V1.U2 > 0
static public bool checkCcw(PlueckerCoordinate c1, PlueckerCoordinate c2)
{
return(SpatialVectorDouble.dot(c1.u, c2.v) + SpatialVectorDouble.dot(c1.v, c2.u) > (double)0);
}
// could be optimized but not wirth the time to optimize
public static PlueckerCoordinate createByNegativeVector(SpatialVectorDouble p, SpatialVectorDouble dir)
{
return(PlueckerCoordinate.createByPandQ(p, p - dir));
}