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The scene is rendered in Isosurface render mode and uses the glass geometry as Render Cutter. Check Liquid Inside a GlassUsing Initial Liquid Fill with Containers for more information on setting up rendering of such scenes. The Isosurface Level is deliberately set below the default 0.5 - down to 0.3 - so that the liquid volume would expand and would entirely intersect the glass geometry. This way the Render Cutter would clearly cut the liquid without any remaining air pockets between the liquid and the glass.
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