Naughty Dog Engine 2
Evan Wells boasted about the snow effects of Uncharted 2, the "prettiest snow you have ever seen in a game!" Improvements to the Naughty Dog Engine 2 enabled more detail and higher polygon counts.
Attention to Detail
As characters walk through the snow, they leave footprints and snow displaces. Snowflakes blow in the wind realistically, and accumulate on the character's clothes and hair. When a character goes indoors, any snow thaws slowly over time.
Ice
Ice effects also look realistic. The way light reflects within ice gives "a look of incredible volume and density," says co-lead designer Richard Lemarchand.
Snow Effects on Gameplay
Gamers will deal with the effects of snow in the game. The reduced visibility caused by snowstorms causes complications in the game's gun battles.