Spielberg wasn’t 100 percent happy with the wide test shots of the dinosaurs—they just weren't photorealistic enough. So Muren and his ILM team, spurred by their revolutionary experience in designing and incorporating fully computer-generated characters into films likeThe Abyss and Terminator 2: Judgment Day, showed Spielberg an early CGI dino test of a group of Gallimimus skeletons running through a field. Spielberg was in awe of the ease of movement and realism of the effects, but he was still wary that they wouldn’t hold up under intense scrutiny—and he didn’t want to scrap Tippett’s practical animation talents altogether. So the director urged Muren and ILM to go further. When they came back with a CG test of a fully rendered T. rex walking across a field in broad daylight, the director decided to go full CGI for some shots.