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Use AutoCAD's "Extrude" and "Revolve" commands to turn2-D designs into3-D models. "Extrude" is how3-D modelers to refer to the technique of stretching a2-D shape into3-D space. AutoCAD performs this expansion by first extending a new axis at right angles to the2-D axes on which your2-D design sits. It then makes a copy of the2-D shapes you are expanding at a higher location on the axis, while keeping the original shapes at the base of the axis. After converting your2-D design to3-D, display it with realistic lighting and shadows using the "Render" command on the Render tab.
command view and select what view you want. and all line convert to poly lines,circle or3p lines.and command extrude,subtract,union. you can make an3d drawing in CAD
enter from bottom the screen from modeling after that we change from2d to3d
