In an interview with BBC Radio 1, Tom Hanks spoke about the development of the first “Toy Story” film and how seeing his voice paired with a rough animatic gave him faith in the project:
“They took a line from a movie I made for Disney called ‘Turner and Hooch’ in which I was yelling at a dog and they animated Woody to that line, and it was on a loop, they did it again and again.”
Seeing your voice bring a CG animated character alive must be a surreal experience. Seeing the potential in using this newly burgeoning style of animation to tell a story convinced Tom Hanks to join “Toy Story.” Hanks continued:
“There were two things about it. One: it was like, I’m not sure what this is. The computer-generated animation itself had a look that was hyperreal, you know, but then also the marriage of the outraged voice of mine inside this outraged body of a toy was – I mean, it was just undeniably great. So I was in from the get-go. They invited me over to sort of explain this odd unknown quantity of something that may or may not work. And I said, ‘Well, it looks fine to me. Let’s do it!’ And thus it began.”
Source : https://www.slashfilm.com/956403/how-pixar-sold-tom-hanks-on-the-idea-for-toy-story/