Octrees are great for speeding up line picks. You just check which nodes the pick intersecets with, and check the tris in those. So even if you're checking against what was a single mesh of 200,000 polys, if you pick in the centre of the level where no tris are, it'll check nothing. If it passes 5,000 tris, it'll just check those.
LinePick - possible speedup?
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