Research On The 3D Assembly Animation Based On The Lightweight Model

The technology of CAD develops rapidly and been used universally from last century 50 generation. From drawing to 3d construction, now it has been very important aided tools to all kinds of design. Traditional product design tools always adopt plane figure to express mechanical parts and their assembly relationship. The result of the design is the static plane figure of the mechanical models. With this method the condition of movement and relative ubiety is difficult to express when the mechanical models moves. The rationality of the movement and the interference between the parts cannot been judged directly by the user correctly. With the development of the technology of CAD, the technology of 3d construction and computer animation has been used step by step, which produced 3d entity animation ,and the movement simulation can solved the questions.The development of computer animation are summarized in this paper. which according to the question of the present mainstream 3D construction software on the product model data browsing, especially when the model is just used for display,much data redundancy exists in it, presents a lightweight file solution including display information and geometry information. It provides quickly browsing 3D product model and precise definition of geometric elements for inquiry .the file size reduces roughly by data compression to facilitate release and communication over Internet . The implemented 3D browsing system offers lightweight file interfaces to work with data files of popular 3D CAD systems .The other emphases of the paper is research on the assembly animation based on the lightweight model. The realization of animation mainly adopts the thought of key-frame animation. this paper discussed the key technology of the automation of assembly animation , analyses the sequence planning ,and adopted the interactive programming method ,presented the dynamic step expand algorithm based on A* search algorithm which reduced the times of the expand ,and improved the efficiency of algorithm. The paper dynamic displayed the whole assembly animation by key-frame animation, provided engineering example of assembly animation of an automobile frame model, proved the superiority of the algorithm by comparing the other algorithm.At last part it summaries the whole paper , prospects the future work according to the question meeting on the research.