SURFACE CURVE SWEPT SURFACE
Definition
An object is a <SURFACE CURVE SWEPT SURFACE> if and only if: it is a <SWEPT SURFACE>; there exists a reference surface containing the directrix; the generatrix is linked to a sweep reference point on the directrix, so that as this point is moved along the directrix, the replica of the generatrix has a constant relationship with: the tangent to the directrix; the normal to the reference surface