Research On Virtual Laboratory Of Engineering Graphics

The virtual laboratory breaks away from the traditional experiment teaching limit of room, time and arouses the learner's learning interest and ability of getting to work. It has important meaning in the area of modern education. With the computer network technology, multimedia technology and the rapid development of VR technology, especially the vigorous development of distance learning, the online virtual experiments and the development of virtual laboratory are promoted effectively.The system designs and achieves a virtual laboratory based on network, using virtual reality technology, network technology and CAI technology, example of engineering graphics course CAI aimed at its teaching peculiarity. According to the characters of virtual assembly and web, the system based on virtual realty modeling language VRML, combining with JavaScript program etc, builds web-based virtual assembly interactive environment and controls the linear motion, rotation motion and complex motion. Based on intelligent navigation principle, the user intention is captured by the use of transfer of viewpoint, in accordance with his intention to achieve the next step.The system studies the application of VRML in the design of virtual laboratory teaching system, for example, realistic scene, Construction of 3D classroom, suspended menu and automatic or manual control of virtual objects in operation in the scenes. It discusses the modeling method and realization of the virtual model. It gives full play of the parameterization modeling based the characteristics in SolidWorks, and designs the accessories and uses assemble design tools to build assembly.The technology of 2D and 3D cartoon associated is raised. The use of Flash ActionScript technology achieves 2D graphics and 3D model of the real-time interaction in the same window. And body shape size is changed in a certain range by user through interactive.Lastly, combining network technologies and using IIS to constitute Web site on the local computer, the achieved courseware uploads to the Web site realizing network of teaching.