Comments (1)
if the two root's children aren't colliding, then no more collisions will be tested amongst objects deeper in the tree.
Not really. Two objects can collide within a child of the root while they are both far away from another child. The bounding volumes of two children don't touch only means there won't be any collision between any pairs containing an object from child A and another from child B, which is independent of the check of collisions inside each of the children. The early-out routine should descend into every level of the hierarchy in order to consider every possible collision pair. So I consider it as a bug because it ignores one of the major situations.
There also has been a related post in stackoverflow which may help. http://stackoverflow.com/questions/8260848/bvh-collision-traversal-algorithm-not-looking-within-each-descendant
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