What did James Cameron invent?

James Cameron is known for his innovative contributions to the film industry, particularly in the realm of special effects and filmmaking technology. He invented the "virtual camera" system, which allows filmmakers to visualize and manipulate CGI elements in real-time during filming. Additionally, he played a significant role in developing advanced 3D technology and underwater filming techniques, especially for his groundbreaking films like "Avatar" and "Titanic." Cameron's work has significantly influenced how movies are made and experienced.