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Virtual reality (VR) display systems have undergone significant research and development since their introduction. Early systems used a head mounted display to provide users with a means of viewing a virtual environment. With the development of the CAVE Automatic Virtual Environment (CAVETM) that used multiple projectors and display surfaces, users gained a three-dimensional (3D) sense of the virtual environment and a sense of depth and immersion in the synthetic environment without bulky headwear. One of the key challenges with creating VR environments is the creation and manipulation of 3D models to generate immersive scenes. Traditionally these models and scenes have been created on a desktop computer, using a twodimensional display system. Although these systems have seen widespread adoption throughout academia and industry, they have significant drawbacks. When creating 3D models, the need to understand model size and spatial relationships between models is critical. This can be difficult to perceive on a 2D display system. Another important challenge is controlling applications running in an immersive environment. Devices such as gamepads and wands are small and lightweight, making them easily carried inside an immersive environment. However, these devices require users to remember what behavior is tied to each physical button on the device. Other devices, such as Tablet PCs, overcome this limitation by offering a rich user interface, at the expense of being larger and usually requiring two hands to operate. Early handheld devices, such as PDAs, were investigated for use in vi

Real-time scenegraph creation and manipulation in an immersive environment using an iPhone