Snow on players that are walking?

1,5 Years ago I made a map with a snow theme that for some reason when players were walking, the was this snow particle coming out of their feet which looked really cool.

I have lost the maps and I do not remember how I achieved this effect, could you guys please help me? :blush:

Big thanks to everyone! :woot:

 

Map Options > Is map cold?

Or, it's the snow texture, I forget.

 

I think that option is only relevant in CSS.

 

Probably Day of Defeat: Source too.

 

What did it do?

 

Yes, it works in TF2!

 

"world is cold" was originally for day of defeat, it caused breath particles to emit from the player's mouth bone.

 

I thought the Map is Cold option does nothing at all in TF2?