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aren't (we can't truly know if a block is visible until we resolve it because objects of arbitrary height can overlap the view bounds even if the block's footprint does not); resolve the definitely visible ones first and go ahead and start drawing once the known visible blocks are ready. This cuts the time spent on the "blue screen" by about 75%. git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@2595 542714f4-19e9-0310-aa3c-eee0fc999fb1