Generation of Model Data
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The previous chapter introduced our method for constructing and drawing scenes: a routine SCENE is used to construct data about a three-dimensional scene via construction routines, some using input or DATA statements. Then the vertices are transformed into the OBSERVED position, and the routine DRAWIT is called to display the scene. In the following chapters we will give a number of different types of DRAWIT, PROJEC and facet display routines, dependent only on the projection and type of picture you require: line drawing, colour with/without shading, shadows etc. All the reader need do is create the relevant SCENE and construction routines and call the correct DRAWIT routine.
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