Not only for games or animations, very often, partial or full live sound recording is not possible or the requirements of the desired sound source are not viable on stage or would be more efficient doing that latter. In those cases separately in field or in studio recording is a common resource. Not only those amazing Sound Effects SFX, but many others of the sounds we assume like “real” in a movie, have been separately recorded and mixed in the final post production for cleanliness, convenience reasons or as a matter of last resource at times.
