In 2008, "Journey to the Center of the Earth" became the first live-action feature film to be shot with the earliest Fusion Camera System released in Digital 3D and was later followed by several others. "Avatar" (2009) was shot in a 3D process that is based on how the human eye looks at an image. It was an improvement to the existing 3D camera system. Many 3D camera rigs still in use simply pair two cameras side by side, while newer rigs are paired with a beam splitter or both camera lenses built into one unit. While Digital Cinema cameras are not a requirement for 3D they are the predominant medium for most of what is photographed. Film options include IMAX 3D and Cine 160.