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how i made realtime "liquid" in a beer bottle in unreal
This graph takes the plane position and normal set by the blueprint each tick and makes a mask for liquid below the surface offset by the three sine offset material functions I made and also makes a mask for the walls foam lining the inside walls of the bottle.
This graph outputs the color of the foam in the bottle using two different sets of UVs for shading the foam against the side of the bottle and the top surface of the liquid using a cool way to calculate the UVs for a surface described by an up-vector I found here
