Zigzag — This is more like an X parallel rough. Roughs each Z level raster-style with an optional profile pass around each slice.
Offsets — Each slice is offset repeatedly to form the toolpaths.
Vortex — An offset toolpath, which is machined at the specified cutting feed rate almost all of the time. The optimum tool engagement angle is never exceeded, by replacing difficult toolpath segments with trochoids. This works well for solid carbide tools.