Wire-frame objects

Spheres are drawn as semi-transparent objects, with a wire frame on their surface to enhance the impression of depth and to make it easier to judge the size of the spheres in the third dimension (Fig. 6.6). 

The wire-frame representation of a three-dimensional object consists of a three-dimensional vertex point list and an edge list of vertex pairs. Although this representation is very simple, it is an ambiguous representation for determining such quantities as surface area and volume of an object. Wire-frame... 

FIGURE 19.50 Various object representation schemes (a) wire-frame, (b) constructive solid geometry, (c) spatial occupancy, (d) surface-boundary, (e) generalized-cone, (f) aspect graph. 

Wire is coated by being passed through a plastic extruder, but most materials are coated with solutions, emulsions, or hot powders. The classic brushing process has been replaced by roll coating, spraying, and hot powder coating. The application of polymers from water dispersions to large objects, such as automobile frames, has been improved by electrode-positon of the polymer onto the metal surface. 

Malleability Most metals can be hammered or rolled into sheets, which means that they are malleable. Their flexibility allows them to be ductile, or drawn into wires. These characteristics are another reason that metals are found in electronic products, as well as objects such as eyeglass frames. 

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