This is an implementation of the <a href="http://www.cg.cs.tu-bs.de/media/publications/fast-rayaxis-aligned-bounding-box-overlap-tests-using-ray-slopes.pdf">Fast Ray/Axis-Aligned Bounding Box Overlap Tests using Ray Slopes</a> paper. <p> It is an efficient implementation when testing many axis-aligned boxes against the same ray. <p> This class is thread-safe and can be used in a multithreaded environment when testing many axis-aligned boxes against the same ray concurrently.