3D Model Objects

(1) Wireframes

              A wireframe model is a skeletal description of a 3D object. There are no surfaces in a wireframe model; it consists only of points, lines, and curves that describe the edges of the object. With AutoCAD you can create wireframe models by positioning 2D objects anywhere in 3D space. AutoCAD also provides some 3D wireframe objects, such as 3D polylines (that can only have a CONTINUOUS line type ) and splines, Because each object that makes up a wireframe model must be independently drawn and positioned, this type of modeling can be the most time-consuming.

Wire frame lines in 3d view

(2)Surfaces

                   Surface modeling is more sophisticated than wireframe modeling in that it defines not only the edges of a 3D object, but also its surfaces. The AutoCAD surface modeler defines faceted surfaces using a polygonal mesh. Because the faces of the mesh are planar, the mesh can only appropriate curved surfaces.

 (3)Solids

              Solid modeling is the easiest type of 3D modeling to use. With the AutoCAD solid modeler, You can make 3D objects by creating basic 3D shapes; boxes, cones, cylinders, spheres, wedges, and tori (do nuts). You can then combine these shapes to create more complex solids by joining or subtracting them or finding their intersecting (over lapping) volume. You can also create solids by sweeping a 2D object along a path or revolving it about an axis.