> As for the image, interesting (btw how did You make the steam?), but
> "bubbles" should be like x4 smaller IMHO.

The steam is made up of spheres filled with non-uniform density
scattering media, with an IOR 1.0005 and enclosing a each one a
concentric sphere, half its radius, whose IOR is 1.001.
Both bubbles and steam spheres are spread and inflated according to a
certain 4-component vector function -- I guess I will try tweaking it a
bit...

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