Well, judging by the acute lack of follow-ups to this poor 
excuse-for-a-thread, it seems that the topic isn't the easiest one in the 
world. Even the results of an intensive Google session were pretty much 
non-existent :( Looking into the POV sources, I think the heightfield code 
there does more or less the same thing as I presented, but I didn't 
understand much of it (there's _lots_ of code in the intersection test).

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