NRBLINE: Construct a straight line. Calling Sequence: crv = nrbline crv = nrbline(p1,p2) Parameters: p1 : 2D or 3D cartesian coordinate of the start point. p2 : 2D or 3D cartesian coordinate of the end point. crv : NURBS curve for a straight line. Description: Constructs NURBS data structure for a straight line. If no rhs coordinates are included the function returns a unit straight line along the x-axis.