The Refraction input takes in a texture or value that simulates the index of refraction of the surface. This is useful for things like glass and water, which refract light that passes through them.
| Common Indices of Refraction | |
|---|---|
| Air | 1.00 |
| Water | 1.33 |
| Ice | 1.31 |
| Glass | 1.52 |
| Diamond | 2.42 |