generated new animation tools for facial, body and cloth design especially for the movie, and elements of keyframe animation were incorporated into the film in order to capture the facial expressions of the actors and actresses. The mead hall battle scene near the beginning of the film, among others, required numerous props that served as additional markers; these markers allowed for a more accurate manifestation of a battlefield setting as the battle progressed. However, the data being collected by the markers slowed down the studios' computer equipment and five months were spent developing a new save/load system that would increase the efficiency of the studios' resources. To aid in the process of rendering the massive quantities of information, the development team used cached data. In the cases that using cached data was not possible, the scenes were rendered using foreground occlusion, which involves the blurring of different overlays of a single scene in an attempt to generate a single scene film. Other elements of the film were borrowed from that of others created by Imageworks: Spider-Man 3 lent the lighting techniques it used and the fluid engine present in the Sandman, while the waves of the ocean and the cave of Grendel's mother were modeled after the wave fluid engine used in Surf's Up. The 2007 film Ghost Rider lent Beowulf the fluid engine that was used to model the movements of protagonist Johnny Blaze. Jerome Chen worked to process large crowd scenes as early as possible, as additional time would be needed to process these scenes in particular. As a result, the film's development team designed a priority scale and incorporated it into their processors so graphic artists would be able to work with the scenes when they arrived. So much data was produced in the course of the creation of the film, the studio was forced to upgrade all of its processors to multicore versions, which run quicker and more efficiently. The creation of additional rendering nodes throughout Culver City, California was necessitated by the movie's production. Mark Vulcano, who had previously worked on VeggieTales and Monster House, served as Senior Character Animator for the film. In designing the dragon, production designer Doug Chiang wanted to create something unique in film. The designers looked at bats and flying squirrels for inspiration, and also designed its tail to allow underwater propulsion. As the beast is Beowulf's son with Grendel's