To help users quickly begin building, JanusVR offers "template rooms", which are geometry that can be used to define a structure and boundary for a Room.
See graphic: http://janusvr.com/docs/build/roomtag/img/templates.png
use_local_asset - By entering any of the strings from the above image as a value, the associated default room geometry will be used.
visible - (default "true") Whether or not the default room geometry is visible.
http://janusvr.com/docs/build/roomtag/index.html#Room