Rhino responds to commands entered into the Command prompt. Some of the basic modeling commands are as follows:
BOX constructs a box with a base on the current construction plane. Useful for building basic rectangular components of buildings, including rectangular masses, walls, floors, etc. For non-rectangular objects, try using POLYLINE, EXTRUDECRV, and CAP in combination.
RECTANGLE draws a 2D rectangle on the current construction plane.
POLYLINE draws a 2D or 3D polyline in space. This command is useful for establishing the “base profile” of volumes to be extruded.
EXTRUDECRV converts a curve (a 2D path) into a surface or polysurface, extruded perpendicular to the current construction plane.
CAP fixes “holes” in a polysurface, e. g., places a “bottom” and a “top” surface on an extruded closed curve.
BOOLEANUNION joins two or more volumes into one.
BOOLEANDIFFERENCE cuts one volume from another. Useful for making openings in walls.
LINE draws a line between 2 points.
MOVE moves a selection.
COPY copies a selection.
TRIM trims one object with another.
EXTEND lengthens or shortends curves.
CONNECT extends and trims curves to meet at endpoints.
CIRCLE draws a circle.
ARC draws an arc.
OFFSET creates a parallel or concentric copy of an object.
Note that most Rhino commands have command-line options, invoked by typing a single letter or by clicking on the option in the command line.