To add new comparison element.
If you define more points than the minimum number, the least square method is automatically used.
All elements are three dimensional. For circle the plane is calculated first and all points are projected to that plane for radius calculation.
Select element type from the list (line, plane, circle, ball, cylinder).
Input element name. Name must be numeric.
Select the point for element. Group-option is not availeble yet.
Circle/Ball radius. Use this to force element radius.
Removes all points.
Removes last point.
Show element information. (Not yet available).