Study On The 3D Animation Design And Transmission Of Internet Courseware

With the rapid development of Computer Technology and network, spreading knowledge through network has been an efficient teaching method, which breaks through the shackle of time and area. Interactively teaching on web makes it certain to provide compound information of pictures, words, sound and animations. So, students' interests are excitated and the teaching becomes lively and ready to be absorbed.However, long-distance teaching on Engineering Drawing is different to other courses, because during the teaching, we'll often transform the 3D parts into 2D graphics and imagine the 3D archetypes in our mind. How to express these concepts and realize to train students' abilities of space imagining and expressing 3D models by 2D lines is the difficulty and emphases for Engineering Drawing. So a new method for constructing an internet courseware must be put forward to replace the traditional method. In order to solve this problem, we use JAVA and a Web3D language named Virtual Reality Modeling Language(VRML) to implement interactive control on 3D models. Other Web3D modeling methods are used to show 3D models on web.In this paper, a VR Engineering Drawing long-distance education system is developed based on web, by using some graphics softwares, such as VRML, AutoCAD, 3DSMAX, Photoshop etc., and some Web3D animation tools, such as Cult3D, Viewpoint, Flash and so on. In this system, we use a plug-in called Volo View to realize showing detail drawing interactively; use VRML to construct 3D models; use Web3D tools to show assembly animations. In order to reduce the size of 3D file and make it easy to be transmitted, stream media fonnat is adopted here. The transmission speed is greatly heightened and the video quality remains impervious by converting 3D animation video to stream media. In this paper, wemainly use two types of stream media format-swf and rm. A plug-in namedMacromedia Flash Player and a tool named swift3D are used to realize showing 3D animation which is made in 3DSMAX and then is converted to swf format, a vector format that is easy to be transmitted by internet; Compress original 3D animationvideo (avi format) to rm stream media format. All these methods are used skillfully in this paper, thus the limit of transmission bandwidth of 3D data on web is get over. Besides, in order to overcome the obstacle that more pictures in webpage result in slower network transmission speed, we have a discussion on image compression technology in this paper. JPEG method, wavelet transform method and fractal method are introduced here. We program software to realize these two methods and to compare their capacities. In addition, we present a new image compressionalgorithm based on both wavelet transform and fractal theory-"WaveletTransform and Fractal Predict for Image Compression", which theoretically enable to improve the compression rate and quality efficiently. We have done some research and exploration on the feasibility and implementation of the compression method and prognosticated its capacity as well.