##

##

    See operating CAD ..

    CAD functions:
    Active CAD-Environment

    Active Construction Plane
    The definition of the design plane
        (A User Coordinate System - UCS).
      For the definition you can use a plane or a pre-defined plane.
        (Pre-defined planes: RX or RY or RZ).
        (see CAD-PLN, Definition planes)

      After activation of the new construction-plane
       - "2D" in red is displayed left of the active coordinates,
       - the origin point of the chosen plane is the new coordinate origin
       - all coordinates displayed refer to the new coordinate-system

       To reset to the absolute coordinate system - Reset ConstrPlane

    Example:
    R20 = P(100 0 0) DX       # new origin (100 0 0); keep active X-axis
    R20                       # activate R20 as new coordinate system.

    See Example model sample_ucs1.gcad

    Reset ConstrPlane
    Reset to the absolute coordinate system

    Plane "RZ" defines the absolute coordinate system.
       Create with output code "RZ"