// Define rotation matrix
:ROTM RM0 0. 0. 0.
:ROTM RMREFL_X -1  0. 0. 0. 1. 0. 0. 0. 1.

// Define volumes and place them
:VOLU world BOX 200. 200. 200. G4_AIR

:VOLU mybox BOX 20. 40. 50. G4_AIR
:PLACE mybox 1 world RM0 100. 0. 0. 
:PLACE mybox 2 world RMREFL_X -100. 0. 0. 
:COLOUR mybox 0. 1. 1.

:VOLU mybox2 BOX 20. 40. 25. G4_AIR
:PLACE mybox2 1 mybox RM0 0. 0. 25. 

:VOLU repl1 BOX 20. 10. 25. G4_AIR // needed, but only used for visualisation
:REPL repl1 mybox2 Y 4 20. 0. 

:VOLU mytrd TRD 5. 10. 5. 10. 20. G4_WATER
:PLACE mytrd 1 mybox RM0 0. 0. -25

:VIS world OFF