3D surface models

Command:_3dface Specify first point or [Invisible]: end of pick the bottom left-hand corner of the triangular front Specify second point or [Invisible]: end of pick the top of the triangular front Specify third point or [Invisible] exit: end of pick the bottom right-hand corner of the triangular front Specify fourth point or [Invisible] create 3-sided face: right-click Specify third point or [Invisible] exit: right-click Command:

and the 3D surface model – left-hand drawing of Fig. 20.3 – is seen. Call Hide and the right-hand drawing of Fig. 20.3 is seen.