yes, you could most definately do that...
the big problem is that the tree caculation can be pretty heavy... it involves intersecting a triangle with a cube in 3 space.
I construct an quadtree for my map converter (azone) (which uses your s3d loader I think, your the freaku guy right?)... So you could use that as a foundation if you wanted. My triangle-cube code is fucked right now, but it does an OK job using simpler tasks (it gets too many tringles per node, so is sub-optimal, but it gets all that are in for sure).
Honestly, a quadtree might be at least a good start. The 3rd dimention isnt going to help a whole lot as far as polygon culling goes. expecially in wide-open zones.
And, you could easily extend my quadtree crap to calculate an octree.
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