Ray casting is not a synonym for ray
tracing, but can be thought of as an
abridged, and significantly faster, version
of the ray tracing algorithm
Ray-casting is typically used to implement
CSG operators when objects are described
with boundary representations
Ray casting is applied by determining the
objects that are intersected by a set of
parallel lines emanating from the xy plane
along the z axis
The xy plane is referred to as the firing
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