Coincidentally, John Carmack had been doing his own research and happened upon Luckey's developments. After sampling an early unit, Carmack favored Luckey's prototype and just before the 2012 Electronic Entertainment Expo, Id Software announced that their future updated version of Doom 3, which would be known as BFG Edition, would be compatible with head-mounted display units. During the convention, Carmack introduced a duct taped head-mounted display based on Luckey's Oculus Rift prototype, which ran Carmack's own software. The unit featured a high speed IMU and a 5.6-inch (14 cm) LCD display, visible via dual lenses that were positioned over the eyes to provide a 90 degrees horizontal and 110 degrees vertical stereoscopic 3D perspective.