Hi Guys,
Good to hear you liked it.
I added a wire frame image to explain how I did it.
I used 3 layers slightly differing in size.
The rest of the images are tests.
Some of them only rendered a few passes. Sorry I didn't have more time (and patience).
Can you try it with a torus form?
Yes I added a few. And some twisted ones.
Also testing different colors. Every color works differently I noticed. The contrast of the bubbles and the foam is very tricky. The image of the yellow headphones shows the same. In the center of the bright yellow foam you can't see the bubbles. On the edges you see it is foam.
That's why I also added a twisted torus. It look more plausible as the normal torus, even if the normal one has noise added to it.
Except from the strange white haze on the inside of the torus. Must be a wrong reflection/ior/glossiness thing.
The torus twisted with noise has nice edges but I added too little segments so you can see the polys.
I also tested with some noise modifier on the outer layer and with the scale and density of the noise maps.
Again I think this material could get better with SSS and with better a noise maps. (and a lot of tweaking :)).
I found this one. It is a variation on the Perlin Simplex Noise. I bet it will work great. The thing is, it will only work when I write my own noise map :(
http://briansharpe.files.wordpress.com/2012/01/simplexcellularsample.jpgI'll post/share my max file. I warn you it is a big mess. It sufferd from the tests. Especially the materials.
https://onedrive.live.com/?cid=DA3C93B9FD55B4F0&id=DA3C93B9FD55B4F0%21107Have fun with it!