"The Little Mermaid" was the last Disney feature film in the canon to use the traditional hand-painted cel method of animation (the Disneytoon Studios movie "" used cels too), as well as the last Disney traditionally cel animated feature film directed by Clements and Musker. Disney's next film, "The Rescuers Down Under", used a digital method of coloring and combining scanned drawings developed for Disney by Pixar called CAPS/ink & paint (Computer Animation Production System), which would eliminate the need for cels, the multiplane camera, and many of the optical effects used for the last time in "The Little Mermaid". A CAPS/ink & paint prototype was used experimentally on a few scenes in "The Little Mermaid", and one shot produced using CAPS/ink & paint—the penultimate shot in the film, of Ariel and Eric's wedding ship sailing away under a rainbow—appears in the finished film. Computer-generated imagery was used to create some of the wrecked ships in the final battle, a staircase behind a shot of Ariel in Eric's castle, and the carriage Eric and Ariel are riding in when she bounces it over a ravine. These objects were animated using 3D wireframe models, which were plotted as line art to cels and painted traditionally. The film being both the first film of the Disney Renaissance and the last to use the xerography technology used since the early 1960s with "One Hundred and One Dalmatians" made it somewhat of a transitional film between the two Disney eras.