Working on my first airport. What is the exact purpose of the __outside object other than to make the runway show up? I'm sure the sim could have been coded to show the runways without the __outside object so there must be another purpose. Is it maybe an autogen exclusion zone? Should it be defined to just enclose the runway/taxi/apron or should it extend out beyond them? For objects we define, must they be placed on top of the __outside object or can they be placed beyond its range?