The ray shoots in two directions: from the start point to infinity, and in the opposite direction to negative infinity.
The ray shoots in one direction from the start point to infinity but doesn't include the start point.
The ray shoots in one direction from the start point to infinity and includes the start point.
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The extent of a ray. A ray can be limited to only shooting forward (either positive or positiveAndZero), or the ray can shoot both forward and backward (both).