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(1 edit) (+1)

For a 3d collision detection , Bounding Volume hierachies (BVH) would be a good approach to narrow down on specific potential geometry to test against instead of testing against the entire 3d model (ie. narrow down to specific bounding box leaf which a conservative coarse sweep velocity volume intersects with..). 

But of course, the scene graph woud still be generally 1 combined single model... (seperating it out to seperate meshes will add to draw calls which isn't good for performance.)

I have a 2D version of BVH ported over from original wonderfl source (scroll down to BVHCulling

I didn't convert it to a HAxe generic yet though. Woudl likely need to replace the proxy:T  to a generic data type, and converting it to haxe should be pretty trivial.