how make an object to volume of bubles using volume shader?

[zenop]

Could you be a bit more specific? What exactly is not working out for you?

[Anonymous]

I want make some foam over liquid in a cup.using meshes make render time alot(refraction part need more ray).

[ben.fischler]

There is some excellent work related to your question being done (including @Zeno Pelgrims !) over on the current shaders.xyz challenge: http://www.shaders.xyz/forums/topic/challenge-05-beer-foam/. I highly recommend that site for shader hacking, learning and exploration!

[Robert_Mastny1]

awesome site! I will give the foam challenge a try, looks interesting! Some great contributions in there already. Thanks for the link!