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applications really need to deal directly with the scene repository. The display part of the MISO code doesn't need a scene manager, per se, because it is simply told to visualize a particular scene and scene management happens entirely externally. This is in preparation for making the MISO code work and place nicely with the Whirled code. git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@246 542714f4-19e9-0310-aa3c-eee0fc999fb1