Reference geometry defines the shape or form of a surface or a solid. Reference geometry includes planes, axes, coordinate systems, and points. You can use reference geometry in the creation of several kinds of features:
Given direction by ref-plane and ref-axis, such as surface rotate, extrude and mirror transform.
Given shape's local definition by local coordinate system, such as define a plane by a local coordindate system and two other paremters width and length.
Given a position by a ref-point.
This chapter includes:
Creating reference points.
Creating and using planes.