public Plane3D(LineDescription3D l1, LineDescription3D l2)
{
Point3D ptLinesCross = LineDescription3D.CrossPoint(l1, l2);
if (ptLinesCross.IsNull)
{
return;
}
else
{
p0 = ptLinesCross;
n = l1.directionVector.VectorProduct(l2.directionVector);
n.VectorLength = 1.0d;
}
}
public static Point3D CrossPoint(LineDescription3D l1, LineDescription3D l2)
{
DenseMatrix dmFactorsA = DenseMatrix.Create(2, 2, (r, c) =>
{
if (r == 0) // x row
{
switch (c)
{
case 0:
return(l1.directionVector.X);
break;
case 1:
return(-l2.directionVector.X);
break;
default:
break;
}
}
if (r == 1) // y row
{
switch (c)
{
case 0:
return(l1.directionVector.Y);
break;
case 1:
return(-l2.directionVector.Y);
break;
default:
break;
}
}
return(0.0d);
});
DenseVector dvFactorB = DenseVector.Create(2, r =>
{
switch (r)
{
case 0: // x row
return(l2.p0.X - l1.p0.X);
break;
case 1: // y row
return(l2.p0.Y - l1.p0.Y);
break;
default:
break;
}
return(0.0d);
});
DenseVector dvKvaluesResult = (DenseVector)dmFactorsA.LU().Solve(dvFactorB);
Point3D cross1 = l1.p0 + dvKvaluesResult[0] * l1.directionVector;
Point3D cross2 = l2.p0 + dvKvaluesResult[1] * l2.directionVector;
if (cross1 == cross2)
{
return(cross1);
}
else
{
return(Point3D.nullPoint3D());
}
}
