.spr
and they are almost always found in a game or mod's sprites/
directory.
env_sprite
contains information on types of sprites used in maps, and how they are rendered.You must log in to post a comment. You can login or register a new account.
Also it appears that the sprite renderer has an in-built way to render the sprite attached to a studio model's attachment point. This is why making env_sprite render models can only use body and skin 0, because those properties are taken over to store part of the information used to get this to work.