For more detail this asset from the Unity Asset Store: Click Here
This is a paid asset, but now you can download Vertical Fog for FREE, Please keep in mind this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Vertical Fog v3.0
Polyquest Vertical Fog main features:
• part of the POLYQUEST series
• creates a vertical height fog effect
• simple, interactive and very versatile
• can achieve all sorts of different looks
• very low impact on performance
• works great even on low end devices
• full control over the gradient color & falloff
• could be applied from bottom to top
• could be applied from top to bottom
• works with the unity default scene fog
• Includes a sample terrain geometry
• can mimic sub surface scattering
• can mimic translucency
• can mimic wax, gel, water depth, plastics
• can mimic fog, mist, abyss, glowing light
• can mimic different types of effects
• this individual pack can be seamlessly
complemented with other POLYQUEST
packs