Abstract
Over any planar cubic curve we construct spatial curves satisfying the PH condition in the Euclidean and Minkowski metrics. These curves yield efficient rational approximations for the arc-length function and the offsets of the cubic
Over any planar cubic curve we construct spatial curves satisfying the PH condition in the Euclidean and Minkowski metrics. These curves yield efficient rational approximations for the arc-length function and the offsets of the cubic