Pc-based Virtual Environment Modeling Techniques

Virtual Environments Modeling is an important part in Virtual Reality System. When developing a Virtual Reality System, firstly, the task is analyzed, the target and performance is discussed. Secondly, the hardware and software are arranged. Thirdly, the virtual environments database is set up. including 3D modeling, dynamic modeling, physical modeling, audio modeling, modeling separation and other VR features. The third step is the most important when developing a virtual reality system.There are 2 parts in this paper. The first part includes Chapter 2 and Chapter 3. OpenFlight format is discussed. Virtual Beer Packaging Production Line is taken as an example to show the creative application of OpenFlight format in the machines of the production line. How CAD models of the machines are converted to virtual environment (real-time) models are also discussed. The virtual environments database for Beer Packaging Production Line is set up.The second part includes Chapter 4 and 5. When integrating all the production line machine models into a virtual environment, terrain file is needed. Only DED (Digital Elevation Data) file is accepted in MultiGen Creator 2.4. So the users must convert all the raw files into DED format. But ASCII and BINARY files can't be converted to DED file at Creator 2.4. Thai's why the plug-in "ASCII&BINARY to DED" is designed and developed in this paper. The plug-in is developed with VC++, C language and Creator API functions, and includes 6 modules. The application and development of Creator API-Viewer Tool is discussed. A sample workshop of the Beer Packaging Production Line is applied in the plug-in.The modeling technology is very active in virtual reality field. It's one of the 3 obstacles of virtual reality technology (the expensive VR device, the complex modeling and large amounts of data). There are still lots of difficulties to generate accurate 3D models and virtual environments. Using the plug-in "ASCII&BINARY to DED", the conversion from raw data to DED file and the procedure of generating a virtual environment can be simplified and be much quicker. It's very inconvenient for the users.