or the fifth installment of the Call of Duty series, Call of Duty: World at War. Split screen modes have also been combined with 3D Television technology by hobbyists, using alternate-frame sequencing for the purpose of presenting each of two couch co-op players with their own 2D full-screen image on the same display, rather than for stereoscopy. Due to the complexity involved in correcting the resulting aspect ratios, and that in obtaining 3D glasses which allowed both lenses to synchronize to the same eye-frame, this remained the purview of enthusiasts until 2011, when Sony Computer Entertainment America began to market a 3D display product for their consoles. This display system supported this practice under the trademark SimulView. While the SimulView feature set was designed to work only with the Sony 3D monitor, the move renewed interest in this technology, and it was not long before the gaming community circumvented this vendor lock-in gambit, allowing SimulView-supporting games to utilize the feature on third-party 3DTV equipment. By contrast, in cooperative platform games, both players typically occupy the same screen and must coordinate their actions, particularly with regard to the scrolling. If the scrolling is limited to a forward direction only, players can potentially kill each other. For example, one player lagging behind could cause problems for his partner, as the screen will not scroll onward. If a player was attempting to complete a jump over a chasm, the "safe" surface on the far side of the chasm could be prevented from scrolling into view by a slow player. Developers have attempted to counter these frustrations by using a camera that can zoom in and out over an entire level as needed, keeping both players within the scope of the camera. This type of camera was used to enable the display of four player cooperative gameplay in New Super Mario Bros. Wii. Another strategy allows player screens to be split when the player characters are far apart, but combine into one full-screen image when player characters are close enough together. The 2005 video game The Warriors is considered notable for attempting this in a 3D third-person perspective format. Resource management A common concept in cooperative games is the sharing of resources between players. For example, two players managing one team in a real-time strategy game, such as StarCraft, will often have to draw off the same pool of resources to build and upgrade