A part a generator made, with the parts its faces play and the frames it is placed by: each role
lists the faces that play it, as shapes.face.getFaces numbers them, such as a gear's tip or
bore, and every face plays one role.
For each role, the indexes of the faces that play it.
frames
frames:Record<string,Base.Frame>
Named frames on the part, such as a gear's axis: its origin at the centre of the first face,
its normal along the axis and its direction toward the first tooth.
A part a generator made, with the parts its faces play and the frames it is placed by: each role lists the faces that play it, as
shapes.face.getFacesnumbers them, such as a gear'stiporbore, and every face plays one role.