Volume Blend-Distance
The Volume Blend - Distance modifier blends the Diffuse and Volume Colors of your material based on the distance from the camera.
Areas that are closer to the camera will be tinted less with the Volume Color. As you move further away, more of the Volume Color is visible. This modifier is excellent for creating underwater depth effects. If you blend a darker Diffuse Color with a lighter Volume Color in an infinite slab, you can simulate the effects of murky water on distant objects.

The images below show a water slab with the Volume Blend - Distance enabled in the image on the right.


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