Final Flight of the Osiris is one of nine short films in The Animatrix series, which reveals more about the world of The Matrix. It was written by the Wachowski Brothers and directed by Andy Jones, with CG-animation production and design by Square's North American division. It is the only wholly computer-animated short movie in The Animatrix. It is also the only segment that does not rely on surrealist imagery or a philosophical background, and primarily serves to provide an explanation as to the fate of the Osiris, mentioned in The Matrix Reloaded and Enter the Matrix.

The film was produced by the same animation company that created the film Final Fantasy: The Spirits Within, which also utilized photo-realistic CGI characters, although the realism level was increased for the characters in this short film. Production of Final Flight of the Osiris, according to comments on the Animatrix DVD release, occurred immediately following production of the Final Fantasy film.

for more info go here
http://en.wikipedia.org/wiki/Final_Flight_of_the_Osiris