Introducing "Virtual Geometry" surfaces that can be embedded within the geometry and which respond to alignment corrections in the same way as material geometry. These surfaces do not have any material composition but they can be used in tracking, either during simulation or reconstuction. For instances are provided with this release: Rectangular, Trapezoidal, Diamond-shaped, and Annular. The last of these is inspired by a particular surface occurrring in ATLAS. Input output of these surfaces is provided. Visualization is also provided.