Morph surface machining machines the drive surface, with options for zig-zag, one-way and spiral - additional options for climb or conventional milling are also available.

Though the shape of the part is a major factor, the spiral option can result with the toolpath staying on the part all the time, whereas another style of toolpath would have to retract from the surfaces more often. When morphing between two surfaces/curves the step-over can change depending on the shape of the part.