public static SketchSegment[] CreateLinesRectangle(this SketchManager manager, double x1, double y1, double z1, double x2, double y2, double z2)
 {
     return(manager.CreateLinesByPoints(
                x1, y1, z1, // A
                x2, y1, z1, // B
                x2, y2, z2, // C
                x1, y2, z2, // D
                x1, y1, z1  // A
                ));
 }