The rest machining operation takes the diameter of the previous tool as a parameter and generates passes where the previous tool would leave unmachined material.
Previous tool diameter
The diameter of a spherical mill which is used for the rest material calculation.
The maximum cut depth for a cut
The maximum step-over between passes
The passes are generated along the corners.
The passes are generated across corners
For shallow areas - along passes are generated, for steep areas - across passes are generated.
Passes are generated only where the tool contacts the machining surfaces. If the machining surfaces are missing, the toolpath is generated against the whole part.
A bottom level can be set for the passes
See example of operation on YouTube: