Geometry files are stored as ASCI to facilitate user modification.
Currently only points lines and conics are output. All data is in 3D,
2D features have their 3rd ordinate set to zero. This facilitates
transparent exchange of 2D and 3D data structures from file (ie
2D data can be read as a planar geometrical object in the *Stereo Tool*).

Straight lines are represented in the following overdetermined fashion.

label entry identifier visibility number of times the entry has been seen length end1 3 vector end point end2 3 vector end point direction 3 vector from end1 to end2Ellipses are described as follows.

label entry identifier centre 3 vector ellipse centre x-axis 3 vector conic axis. y-axis 3 vector conic axis. theta major axis of elipse w.r.t ellipse coordinates. alpha length of major axis beta length of minor axis t1 angular start point (radians) t2 angular end point (radians)

root 2017-11-23