If u is a point and v is a line (or plane), the parallel(w, u, v) function defines w as the line (or plane) that passes through u and is parallel to v.

If u is a line, and v is a line, the parallel(w, u, v) function defines w as the plane that contains u and is parallel to v.

Use the function geom3d[detail] for more details about the created object.

The command with(geom3d,parallel) allows the use of the abbreviated form of this command.