Why looks my bottle not realistic?

[Okidoki]

Also in real the plastic to have some thickness and the liquid does fill the inner part of the bottle… this may sound obvious but for example modeling hollow cylinder and incorect IOR (and complete shader) for the liquid ( and plastics) also have their influence…

Maybe you also check some of the tricks and tweaks mentioned here (just one example):

How to create a photorealistic lipton bottle | part 3 shading

…or any other tutorial you may find…

…there was also a discussion about the proper settings (and overlapping…) using a thick glass and the liquid here:

Accurate liquid in glass rendering

When you use thin glass, you can not notice problem. But use thick glass, you can easiliy notice problem if you intersect your surfaces. Example real life thick glass: [image] You can easily see thick glass part. But, if you intersect surfaces, then this glass not show, and result will be wrong.