Creating Interactive Grass in Unreal Engine 4
https://www.raywenderlich.com/6314-creating-interactive-grass-in-unreal-engine-4

Creating Snow Trails in Unreal Engine 4
https://www.raywenderlich.com/5760-creating-snow-trails-in-unreal-engine-4

Dynamic Mesh Painting in Unreal Engine 4
https://www.raywenderlich.com/6817-dynamic-mesh-painting-in-unreal-engine-4

Custom Depth in Unreal Engine 4
https://www.tomlooman.com/the-many-uses-of-custom-depth-in-unreal-4/