Also some should be 'curable', at least as far a booleans if you convert them to polys...just a thought, and that comment from bruno about the Vol Light is right on, when I was playin with the DEMO I found his solution to be the one I came up with as well...also I found setting up using, IIRC, user defined or user setting, and the cranking the AA everywhere I could produced nice, if somewhat slow results.....

 

Once in a while I look around,
I see a sound
and try to write it down
Sometimes they come out very soft
Tinkling light sound
The Sun comes up again