# Three boxes have been joined together, all the surfaces have 
# an initial temperature of 100 K. 
#  ^ Z
#  |                      
#  |--------- -------------  
#  |         |             |
#  | Box 1   |    Box 3    | 
#  |---------|------------- 
#  | Box 2   | 
#  |         |               
#  |         |               
#  |         |               
#  X--------------> Y 

Seed(4321) 
Mode(Temperature) 
Bundle(0.0001) 

   # '3` implies this model is built from two boxes
 Model(3)            

    # Enclosure 1 is a box where X = 1, Y = 2, and Z = 1
Box(1;1,2,1)
 
 # Wall 1 is a joining wall to box 2, wall 4. It is not a real wall, but virtual
Wall(1;join,2,4)

# Wall 2 is described in terms of flux sent into the system 4.536 Watts/m/m =>100K
Wall(2;flux,4.536,0.8,.2,0)
Wall(3;temp,100,0.5,.5,0)
Wall(4;temp,100,0.5,.5,0)
   # Wall 5 joins Box 1 to Box 3
Wall(5;join,3,2)
Wall(6;temp,100,0.2,.8,0)

    # Box 1 has a Media which has a temp. = 100 K, Ke = 1.0 and ssal = 0.2 with
    # isotropic scattering.
Media(1,temp,100,1.0,0.2,isotropic)

#---------- Second Enclosure ------------
Box(2;1,2,4)

Wall(1;temp,100,0.5,.5,0)
Wall(2;temp,100,0.3,.7,0)
Wall(3;temp,100,0.3,.7,0)

   # Wall 4 joins Box 1 to Box 2
Wall(4;join,1,1)
Wall(5;temp,100,1.0,0,0)
Wall(6;temp,100,1.0,0,0)
Media(2,temp,100,0.3,0.8,isotropic)

#--------- Third Enclosure --------------
Box(3;1,3,1)

Wall(1;temp,100,0.5,.5,0)

   # Wall 2 joins Box 3 to Box 1
Wall(2;join,1,5)
Wall(3;temp,100,0.5,.5,0)
Wall(4;temp,100,0.9,.1,0)
Wall(5;temp,100,1.0,0,0)
Wall(6;temp,100,1.0,0,0)
Media(3;temp,100,0.5,0.7,isotropic)