By knowing the field of view (FOV) and the
dimension of the projection plane,
we can calculate the angle between subsequent rays and
the distance between the player and the projection plane. These steps
are illustrated in Figure 11
(Many books define these last two values arbitarily, without telling the reader
where the values come from, here is the justification.)
FIGURE 11 Here is what we know:
Here is what we can calculate:
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So now we know:
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