(local i32 $messageStartIndex)
3014250410http://paper.people.com.cn/rmrb/pc/content/202602/27/content_30142504.htmlhttp://paper.people.com.cn/rmrb/pad/content/202602/27/content_30142504.html11921 “春节已成为世界共享的文化瑰宝”
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The “Knocking on Wood” Wikipedia page mentions Roud’s conclusion, and this claim of a 19th century origin has circulated online as the final say on the matter. If you go back to the original, though, Roud’s proposal actually ends on an ambivalent note: “Before this theory [of 19th century origins] can be finally accepted, however, an examination of the history of European forms of this custom would be advisable.”
A quadtree reduces this: rebuild the tree each frame, and for each object, query only the nearby region. Objects in distant quadrants are never compared.