Computer animation studio Pixar has broken off talks with the Walt Disney Corporation for a new distribution deal. Since 1995, when the fledgling company released Toy Story, Pixar has generated $2.5 billion in revenue, at a time when Disney’s overall hold on the animation market has been slipping. Pixar’s latest film, Finding Nemo, has generated $500 million in global ticket sales, and was nominated this week for four Academy Awards.