In chapter 10 we introduced the function facetfill to produce the window representation of a facet. Up to now this function has consisted of a simple area-fill using a logical colour prescribed in the data construction functions. We can do much more than this! The realism of the images that we produce is greatly enhanced by the use of shading. We take advantage of the colour display of the VGA and XGA cards to model the different appearances of surfaces depending on the light striking them. Plates I, IV, and V show pictures produced using the shading techniques introduced in this chapter.
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