Immersive Virtual Reality

Virtual Reality (VR) is about the interaction with computer generated worlds. Immersive Virtual reality aims to create the feeling of physical presence in a virtual world.

ewline The environment that is simulated by computer is called Virtual Environment (VE) and being immersive is a key characteristic of a virtual environment.

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Interaction in virtual environments contains a domain of different tasks, which can be divided in three categories: navigation, selection/manipulation and system Control citet{bowman20043d}.
Amongst to the different way of interaction with VE 's, e.g, navigation, selection, manipulation and system control then interacting in VE is more challenging than interacting with close surfaces like keyboard, mouse and

Ebert and Shaw cite{ebert1996two,shaw1997thred} have used this form of the menu in their application. In this form of menus collection of the item is arranged by circular plate of sundial that each side has its own pie shape sector; hence, selection of the desired item can be done by pivoting of the shadow stick on base of sundial which is located in the center of the plate in a way that stick 's endpoint lies in front of the sector. The limit number of sector and the precise pointing are problems of this form of the menu because we are trying to have a wide angle of view with any limitation in the number of menu and

This form of menu needs a special form of input device which is Pinch Glove to track the position of the user 's hand and manage each finger for sensitive buttons. Item is presented next to each finger and can be selected by pinching the relevant finger with the thump. The number of items in each menu is limited to 4 but splitting menu into sub menus is possible. This technique is highly recommended in systems with HMD connection that is a cause of TULIP complicate occlusion problem. Because menu needs to be shown near the users finger. But wide angles of view and real interaction style would be missed in this form of the menu. Additional, having more items and sub menus in TULIP menu is confusing.
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includegraphics[width=3. in]{TULIP.png} centering caption{ The TULIP Menu from citet{gerber2004design}.} end{figure} This thesis is looking for a type of menu that is easily accessible and it has natural interaction style. This characteristic would be mostly added to pull down menus; for example: adding hands and fingers into circular menus; especially, pie menus which are the fastest type of menus will lose their advantage; so, pie menu becomes unsuitable. According to our extension plan, natural interaction style would be achieved by using hands and fingers which skip most of the type of menus. Additionally, fish-eye characteristics can