env_sprite can be attached to entity (or an attachment point).
New parameter Start frame to configure the starting frame. Useful if you want to desync animations of several env_sprite instances located in the same area and using the same sprite (e.g. waterfall splatters). Negative values mean the random starting frame.
Once + Remove - remove sprite after playing it once. Should be used with Play Once.
Don't mess Yaw. In Half-Life the yaw angle set in the editor for env_sprite becomes the roll angle in the game. This affects the directional sprites. Tick this flag to prevent this archaic behavior.
env_sprite can be attached to entity (or an attachment point).