Left of
Icy shell is quite soft
You can see how hard some terrain is by holding space. Most maps are within the range of 100 to 200 hardness which makes the terrain changes significant after a few minutes of fighting in the area. Some maps are less than 100 so their pathability and cover will change with few shots. Some maps, like Comet Catcher, Red Comet and most metal texture maps have high hardness so are barely affected. Some maps, like Sandcastles, use varied terrain hardness depending on the look/intention of the terrain.