REFRACTLEVEL

THE BOX'S MAIN HELP:

This is the current level in the refraction tree.  Primary rays 
are at level 0.  The last level is the refraction_depth minus one.  
A shader may increment, decrement or reset this level to circumvent 
the restrictions imposed by the trace depth state variable.

LEV (output):

This is the current level in the refraction tree.  Primary rays 
are at level 0.  The last level is the refraction_depth minus one.  
A shader may increment, decrement or reset this level to circumvent 
the restrictions imposed by the trace depth state variable.

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