# In this case, two surfaces form a 90 degree corner where their length 
    # to width ratio is 1:3.  Direct value is  F1->2 = 0.12

    # The mode is set to View/ Radiation Interchange Factor
Mode(view)

   # The number of bundles to be sent per unit area
Bundle(20000)

Model(1)
 
    # The box is 1X3X3
Box(1,1.0,3.0,3.0)

    # Wall 1 will send the bundles, Emis = 1.0
Wall(1,send,1.0,0,0)

    # Wall 2 will receive the bundles, Emis = 1.0
Wall(2,receive,1.0,0,0)

    # Wall 3 - 6 have been removed
Wall(3,remove)
Wall(4,remove)
Wall(5,remove)
Wall(6,remove)

    # Since this is a view factor problem, the media will 
    # be clear
Media(1,clear)