Animation
Publicity for the film announced that Bakshi had created "the first movie painting" by utilizing "an entirely new technique in filmmaking." Much of the film used live-action footage which was then rotoscoped to produce an animated look. This saved production costs and gave the animated characters a more realistic look. In animation historian Jerry Beck's The Animated Movie Guide, reviewer Marea Boylan writes that "up to that point, animated films had not depicted extensive battle scenes with hundreds of characters. By using the rotoscope, Bakshi could trace highly complex scenes from live-action footage and transform them into animation, thereby taking advantage of the complexity live-action film could capture without incurring the exorbitant costs of producing a live-action film." Bakshi rejected the Disney approach which he thought "cartoony," arguing that his approach, while not traditional for rotoscoping, created a feeling of realism involving up to a thousand characters in a scene.
Bakshi went to England to recruit a voice cast from the BBC Drama Repertory Company, including Christopher Guard, William Squire, Michael Scholes, Anthony Daniels, and John Hurt. Daniels remembers that "The whole cast were in the same studio but we all had to leave a two second gap between the lines which made for rather stilted dialogue." For the live-action portion of the production, Bakshi and his cast and crew went to Spain, where the rotoscope models acted out their parts in costume in the open or in empty soundstages. Additional photography took place in Death Valley. Bakshi was so terrified of the horses used in the shoot that he directed those scenes from inside the caravan.
Bakshi had a difficult working relationship with producer Saul Zaentz. When Zaentz would bring potential investors to Bakshi's studio, he would always show them the same sequence, of Frodo falling off of his horse at the Ford (which was his stunt double actually falling over).
During the middle of a large shoot, union bosses called for a lunch break, and Bakshi secretly shot footage of actors in Orc costumes moving toward the craft service table, and used the footage in the film. Many of the actors who contributed voices to this production also acted out their parts for rotoscoped scenes. The actions of Bilbo Baggins and Samwise Gamgee were performed by Billy Barty, while Sharon Baird served as the performance model for Frodo Baggins. Other performers used on the rotoscoping session included John A. Neris as Gandalf, Walt Robles as Aragorn, Felix Silla as Gollum, Jeri Lea Ray as Galadriel, and Aesop Aquarian as Gimli. Although some cel animation was produced and shot for the film, very little of it appears in the final film. Most of the film's crowd and battle scenes use a different technique, in which live-action footage is solarized (per an interview with the film's cinematographer, Timothy Galfas, in the documentary Forging Through the Darkness: the Ralph Bakshi Vision for The Lord of the Rings) to produce a more three-dimensional look. In a few shots the two techniques are combined.
Bakshi claimed he "didn't start thinking about shooting the film totally in live action until I saw it really start to work so well. I learned lots of things about the process, like rippling. One scene, some figures were standing on a hill and a big gust of wind came up and the shadows moved back and forth on the clothes and it was unbelievable in animation. I don't think I could get the feeling of cold on the screen without showing snow or an icicle on some guy's nose. The characters have weight and they move correctly." After the Spanish film development lab discovered that telephone lines, helicopters, and cars could be seen in the footage Bakshi had shot, they tried to incinerate the footage, telling Bakshi's first assistant director that "if that kind of sloppy cinematography got out, no one from Hollywood would ever come back to Spain to shoot again."
Following the live-action shoot, each frame of the live footage was printed out, and placed behind an animation cel. The details of each frame were copied and painted onto the cel. Both the live-action and animated sequences were storyboarded. Of the production, Bakshi is quoted as saying,
Making two pictures [the live action reference and the actual animated feature] in two years is crazy. Most directors when they finish editing, they are finished; we were just starting. I got more than I expected. The crew is young. The crew loves it. If the crew loves it, it's usually a great sign. They aren't older animators trying to snow me for jobs next year.
Although he continued to use rotoscoping in American Pop, Hey Good Lookin', and Fire and Ice, Bakshi later regretted his use of the technique, stating that he felt that it was a mistake to trace the source footage rather than using it as a guide.
By the time Bakshi was done animating, he had only four weeks left to cut the film from a nearly 150-minute rough cut. Restoring a piece of animation where Gandalf fights the Balrog (replaced in the finished film by a photomontage), Eddie Bakshi remarked that little of the film was left on the cutting room floor. Bakshi asked three additional months to edit the film, but was declined. After test-screenings, it was decided to re-cut the end of the picture so that Gollum would resolve leading Frodo and Sam to Shelob before cutting back to Helm's Deep, so as to not end the film on a cliffhanger.
Working on the film were Tim Burton, Disney animator Dale Baer, and Mike Ploog, who worked also on other Bakshi animations such as Wizards.