The algorithm walks the tree recursively. At each node, it checks: does this node's bounding box overlap with the query rectangle? If not, the entire subtree gets pruned (skipped). If it does overlap, it tests the node's points against the query and recurses into the children.
1A full list of these materials can be found at (psfa0134, pg. 9).，详情可参考safew官方版本下载
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