I tried to render a simple glass with a liquid inside. I gave both elements a dielectric material (mental ray node). The only thing I changed was the color and IOR for the liquid material.
Now when I render my glass it’s strangly dark on the top and at the bottom. Is there a way to get rid of it and achieve a more realistic result? Please see the attached image. I checked all my normals and I think the topology should also be fine.