Projector Screen Locator

normal=down,roll=0 normal=down,roll=1 normal=down,roll=2 normal=down,roll=3 normal=east,roll=0 normal=east,roll=1 normal=east,roll=2 normal=east,roll=3 normal=north,roll=0 normal=north,roll=1 normal=north,roll=2 normal=north,roll=3 normal=south,roll=0 normal=south,roll=1 normal=south,roll=2 normal=south,roll=3 normal=up,roll=0 normal=up,roll=1 normal=up,roll=2 normal=up,roll=3 normal=west,roll=0 normal=west,roll=1 normal=west,roll=2 normal=west,roll=3