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I've been doing a lot of test with the 2.47 PMC beta, it's fun watching the caustics "grow" and the PMC is a great kernel, so I went in a test-frenzy to see how I could stress Octane. In the way I had to learn some extra modeling tricks and worked hard to get the soda foam to look good.
There is room for improvements, and since this are just test I've tried different light setups, from simple HDRI (where PT clearly excels, being much faster converging) to hdri+spotlight to really bring those caustics out (and here PMC does the best job solving faster and cleaner).

hey, great images. the ice looks a bit strange (maybe to heavy reflection)
i specially like the foam.. how did you do that, is it a texture??

The ice does look weird, not quite right yet, the foam and liquid is a single macro with some masks. I'll upload it to the Live DB once I finish some renders I'm doing.

Cool renders! Try make the ice more irregular and perhaps add some bubbles inside them?

Excellent render accept the ice

3rdeye