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Virtual reality is a reality of virtual, which can be divided into several objects and should be classified to data processing. Computer system is composed of different software and hardware, calling for the object category of real world should be entered into the corresponding computer system. In order to make calculation results presenting in the display system and realize man-machine communication, display system and computer must be matched completely. Finally, people should have an integrated control of the above system, that is to say the conversation between the user and the virtual scene. This process can be expressed with mathematical formula as follows: Setting World as virtual reality world, this can be divided into different sub object W (W1, W2, W3 (Wn); M is a computer system M (M1, M2, M3 Mn); Q is the display system Q (Q1, Q2, Q3 Qn). Defining the virtual scene which needs to be built: Watch: World →W (W1, W2, W3 Wn) Introducing the classification of virtual worlds into the computer system and defining the input function as f (x): f(x): W → f(M) Projecting the computer processing results onto the display system and defining the performance function as S (y): S (y): F (M) → S (Q) As for conservation between human and virtual scene dialog, defining the control function as A (Z): A (z): S (Q) * M + Z, (Z : human factor) [World, W, M, Q, Watch, f (x), S (y), A (z)] constitute the theoretical framework of virtual reality. In the essential process of F(x) function operation, the important content is modeling the virtual scene, which refers to geometric modeling, motion modeling and physical modeling.

The Fundamental Theory of True 3D Virtual Reality and The Development of Scene Structure Research