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    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)
      The origin point of the chosen plane is the new coordinate origin.
      In relation to the design plane are now:
       - Coordinate data
       - Displaying positions

       The display of the mouse position can be relative or absolute.
         Relative: (Default Setting) the coordinates in the new coordinate system;
         Absolute: Sets all coordinates to absolute origin relative.
       Toggle the radio button between "rel" and "abs" next to the display of the mouse position.

       To reset to the absolute coordinate system - Reset ConstrPlane

    Example:
    R20 = P(100 0 0) DR DY
    # Zero in 100,0,0; new X-axis in 0,10,0
    R20
    # Enable use of a new coordinate system.

    See Example model sample_ucs1.gcad

    Reset ConstrPlane
    Reset to the absolute coordinate system

    Plane 0 defines the absolute coordinate system.
       Create with output code "R0"