Awesome

SnowDeformation

To create a snow accumulation and deformation effect along with physical based rendering

Reference:

1.GPU PRO 7: Deferred Snow Deformation in Rise of the Tomb Raider

2.Deformable Snow Rendering in Batman: Arkham Origins

3.Real Shading in Unreal Engine 4

4.Writing a Cook-Torrance Surface Shader

5.Physically-Based Shading at Disney