The very first film Walt Disney film to be entirely computer-animated. The film used computer-animated characters on live-action backgrounds and was Disney's most expensive film to produce to date. While a dinosaur-related computer-animated film had been contemplated for over a decade, the film finally went into production when it did, as "the technology to produce the stunning visual effects" had come about - a few years before Dinosaur's eventual release in 2000. The CGI effects are coupled with "real-world backdrops to create a 'photo-realistic' look". The crew went all around the world, in order to "record dramatic nature backgrounds" for the film, which were then "blended with the computer-animated dinosaurs". Disney said that the over-$100 million visual effects "make the film an 'instant classic'".The concept for the film was originally conceived by Paul Verhoeven and Phil Tippett in 1988 and was pitched as a stop-motion animated film with the title Dinosaurs. The film's original main protagonist was a Styracosaurus and the main antagonist was originally a Tyrannosaurus Rex. The film was originally going to be much darker and violent in tone and would end with the Cretaceous-Paleogene extinction event, which would ultimately result in the deaths of the film's characters. Paul Verhoeven and Phil Tippett pitched the idea to Disney, only to have the idea for the film shelved away with the onset of the Disney Renaissance until the mid-1990s. The film was originally supposed to have no dialogue at all, in part to differentiate the film from The Land Before Time with which Dinosaur shares plot similarities. Michael Eisner insisted that the film have dialogue in order to make it more "commercially viable". A similar change was also made early in the production of The Land Before Time, which was originally intended to feature only the voice of a narrator.