What is the right way to make bottles and glasses?

[Lyubomir]

I would very much appreciate some tips on how to model the glass and liquid surfaces, how to orient the normals, etc.

What I tried is making an outside shell of glass material and an inside shell of liquid material, both with normals pointing out. Didn't work. The glass is always visibly "wrapping" the liquid, while in reality only the liquid should be visible.

I quess it should be done with an outside glass shell, an inside glass shell and a liquid surface, but then there are many combinations: the inside glass shell and the liquid surface could be overlapping, there could be tiny empty space between them, then the normals come into play again, etc.

What is the right (best) way?

Thanks a lot!

[Qtoken]

This Tutorial from Blendercookie.com for Blender -> Luxrender should have some good pointers, Much of it applies with Octane as well.

http://www.blendercookie.com/2011/05/03 ... luxrender/

[Lyubomir]

Thanks for the link!

But I don't think Octane has interior and exterior volumes like Luxrender, and generally this method seems a bit limited to me - it's not going to work with simulated liquids, if I understand it correctly.

Anyway, I figured it out in a different way - outside glass shell (normals out), then water surface (normals out), then inside glass shell (normals in). The water surface is between the two glass surfaces. Seems to work.