The 24 @-@ man animation team was split into two groups . Half was assigned to the creation of the 15 new CGI creatures populating noitulovE ( in Maya ) , while the other half created the backgrounds ( in Houdini ) . Compositing work – combining the greenscreen shots with stock footage and CGI elements – was performed in Flame and Inferno . As the final commercial was to be shown on cinema screens , the animators worked at a resolution higher than that afforded by the 576i definition used by British PAL @-@ encoded television sets , to improve the appearance of the advert when projected .