Polygonal Map not working in rviz.

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I've been trying to get PolygonalMapDisplay to work in rviz [specifically with the kinect demos] In rviz the polygonal map display says "plugin from package [mapping_rviz_plugin] not loaded for display class [mapping_rviz_plugin::PolygonalMapDisplay])

I've looked around in the file system and can't find any Polygonal Map stuff. Does anyone know where I might be able to find this plugin/how to get polygonal maps to work in rviz?

Thanks!