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and rayTestInternal re-uses precomputed invRayDirection/signs. also did some performance comparison with different ray-AABB test, from http://jgt.akpeters.com/papers/EisemannEtAl07/ In short: it is faster, but it is not clear how to cull ray segments using ray slopes: when rays starts inside the AABB, we get a negative t value, but negatives also get false t-values...