I'm working on a render of a wine glass. I'm feeling pretty good about everything so far, but I can't seem to figure out how to adjust the geometry or material settings to solve the hard change in refraction that starts halfway up the glass.

I looked into some common issues with glass — adjusting maximum light paths, edge split instead of subsurf modifiers. And they helped quite a bit with the wine itself, but the glass remains befuddling.

Glass settings are simply: Glass BSDF, Beckmann, 0 Roughness, 1.45 IOR.

Here are a few photos. The render. The object. And an edit mode screenshot with the edge selected.

wine glass render


enter image description here

  • $\begingroup$ Are you using any modifiers currently on it? $\endgroup$ – Nate_Sycro27 Aug 4 at 17:58
  • $\begingroup$ Just a blind guess - make sure normals are correct blender.stackexchange.com/q/165080/78972 $\endgroup$ – Jachym Michal Aug 4 at 18:14
  • $\begingroup$ @Nate_Sycro27 nope - no modifiers! $\endgroup$ – Kyle Billings Aug 4 at 18:44
  • $\begingroup$ @JachymMichal normals look correct. always a good blind guess though. :) $\endgroup$ – Kyle Billings Aug 4 at 18:49
  • $\begingroup$ Did you remember to downscale the liquid a tiny bit to not having it intersect with the glass mesh? $\endgroup$ – sorenfroststaal Aug 4 at 19:23

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