If this option is deselected then all regions of a feature are cut at one Z level before descending to a deeper Z-level.
Note: This attribute has no effect if the toolpaths for your feature do not rapid between regions of the feature.
The images below show how regions of a feature are completely cut before moving on to another region.
Note: For an NT toolpath,
Depth first cuts by region, so it cuts a Pocket feature in the same way as a traditional toolpath. However for a Boss feature, a traditional toolpath cuts depth-first for each toolpath before moving to the next stepover, not by region.
If you are using Multiple roughing tools or Multiple finishing tools, to efficiently rough out tight corners, Depth first is also useful. The images below show a tool finishing tight corners in a depth first manner.
