The Project handle is a modified Vector handle.  It has additional
options in the RMB menu, and can specify a specific axial angle.  It
also lacks any origin, always having as its origin the input group 
centroid.  It is displayed as a directed arrow pointing from the
origin.

Parameters:

    axis        - Which axis to project along, including minimum
                  distance.
    input       - A group field.  The centroid of this group is used
                  as the default origin.
    onoff       - Whether the handle is visible, 1 means visible.
    scale       - The scale of the vector governed by the red tip on
                  the arrow.
    twist       - The twist component of the arrow.  This is altered
		  by dragging the circle at the end of the arrow.  It
                  is reported in degrees.
    vx, vy, vz  - The normalized direction of the arrow.

See Also: Vector, Angle
