Saw this video by Dalibor Cee the other day: vimeo.com/18745006 and gave it a shot. 1h later i got this...
The fume pass is blobby admittedly. That's because the grid is like 100x100x25 lol, it's all done on my notebook while the big machines were humming along (dual core, 4gig ram).

Texturing all done in comp with UV and Normal render elements. Main element is AO only.

Box#2 glue bindings breaking by overstretch and force.

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