I take the risk of appearing stupid, but is it possible to make the
assumption that if a ray hits an object, the rays next to it (next pixel
for example, or the next ray shot, or so ...) have a high probability to
hit the same object, thus avoiding useless tree-traversal and intersection
test? Would it be costful: if the test fails, then we go on with the normal
traversal with little overhead, and if success, we save a non neglectable
time?

Is it possible to collect ray-object intersection statistics while shooting
rays and intersecting, in order to make prediction?

    Bruno

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