Well, as the subject implies, I get strange artefacts when adding a liquid inside a bottle I just modelled. Since I'm using KS 8.1 I shouldn't have to worry about spacing etc between the glass and the liquid, no? A previous model & render test gave expected result (i.e. no weird lines), but this cola bottle is giving me headaches. The model to the left has the liquid turned off, and the one to the light has the factory juice-material applied. I have tried with a lot of liquids, but they all yield the same result. Any thoughts?