How about a list of films that were produced using CG animation in conjunction with traditional animation or live action? Note that this excludes the live-action-with-CG-star category (Scooby-Doo, King Kong, Chipmunks, Yogi Bear); movies with live action bookending traditional animation (The Pagemaster, Balto); and motion-capture films (Final Fantasy, The Polar Express, Beowulf, A Christmas Carol). Please feel free to correct any errors, and no doubt there are more than these:
Princess Mononoke (1997): Some use of CG backgrounds and creature modeling.
Tarzan (1999): First use of Deep Canvas–CG backgrounds with overlaid traditionally animated characters.
The Iron Giant (1999): CG vehicles, props, and title character blended with traditional animation.
Titan A.E. (2000): CG backgrounds and vehicles with overlaid traditionally animated characters.
Dinosaur (2000): Live-action backgrounds with overlaid CG animated characters.
Atlantis: The Lost Empire (2001): Some use of Deep Canvas–CG backgrounds with overlaid traditionally animated characters.
Spirited Away (2001): Some use of CG backgrounds and props.
Spirit: Stallion of the Cimarron (2002): Jeffrey Katzenberg’s “tradigital animation,” supposedly seamless blending of CG and traditional animation including characters.
Treasure Planet (2002): Some use of Deep Canvas–CG backgrounds and vehicles with overlaid traditionally animated characters.
Sinbad: Legend of the Seven Seas (2003): CG backgrounds, creatures, and vehicles with overlaid traditionally animated characters, possibly some tradigital animation of characters.
Howl’s Moving Castle (2004): Some use of CG backgrounds, CG animated title character.
Curious George (2006): Some use of CG backgrounds with overlaid traditionally animated characters drawn to look 3D.
Arthur and the Invisibles (2006): Primarily cuts between live action and CG animation, but several scenes (Arthur in and out of Minimoys’ world and a bouncing ball) could be hybridized. Also, the CG animation is reportedly based on photogrammetry, which seems fairly unusual and hybridized among CG films.
From the trailers, Vexille and Appleseed Ex Machina look like CG backgrounds and vehicles with overlaid traditional anime (and maybe some motion capture), but it’s hard to tell what the processes were for those films.
From this list, one can infer that the hybrids were tried for a decade or so, then abandoned in favor of more uniform production processes. DreamWorks’ upcoming Me and My Shadow might provide a new spin on CG hybridization, or maybe not.
Also, in the interest of completism, here are some traditionally animated films that included stand-alone CG sequences or other limited use of CG imagery:
The Black Cauldron (1985)
The Great Mouse Detective (1986)
Oliver and Company (1988)
The Little Mermaid (1989)
Jetsons: The Movie (1990)
The Rescuers Down Under (1990)
Beauty and the Beast (1991)
Aladdin (1992)
The Lion King (1994)
Pocahontas (1995)
Whisper of the Heart (1995)
The Hunchback of Notre Dame (1996)
Hercules (1997)
Mulan (1998)
Fantasia 2000 (1999)
Brother Bear (2003)
Cheers! Steve