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Light rays bend when passing through objects of differing densities. For example, light bends when it passes through air into water. Refraction makes objects appear as though they are in a different location than they really are because of the bending effect. The Refraction channel controls the surface light bending.
When you add refraction strength with a numerical value, an image map, or a combination of both, one of two things can happen at render time:
You have the following options when working with this channel: