halflifegifs:

cummies9001:

halflifegifs:

An example of layered texturing in one of Half-Life 2: Episode 2′s 3D skyboxes, a technique used to give Valve’s maps a sense of broader depth and scale. 

they also do this in tf2 maps like lumberyard and sawmill

Yes! It’s a really effective illusion that requires very little processing power considering how integral it is to the atmosphere of the maps and also when I read your url my pancreas spontaneously imploded thanks!