| Nowadays, the apparel corporation is confronted with a bottleneck problem, which is the virtual mall can only show some pictures of clothes to customers. It is far away from the conception of "virtual", and clients would rather go to real shop to buy clothes because they can try clothes on. This article realized a virtual garment try-on system, and it was especially suitable for e-commerce.In this paper, the sculpt point three-dimensional coordinate transformation model, aimed to show the relation of human body and clothing structure, was constructed with making use of theories of proportion law, combining the parameter design method for Bezier curves. By this model, we got the sculpt point 3-D coordinate of curved surface on 3-D garment, which was generated by the system automatically according to kinds of customer body size and garment fashion. Besides, the 3-D model was parameter-controllable. The paper also gave four existing forms of stitched line and the evaluation algorithm of control points. Using the evaluation procedure in the OpenGL, we got 3-D Coordinate of control point for Bezier curve by 3-D Coordinate of sculpt point. After obtaining 3-D garment sculpt point and control point, resting on the idea of small curved surface piece connection, it constructed plan model of the 3-D garment rigid curved surface by fitting lower order Bezier curves. Paper built rigid model for non- rigid garment. This would not only reflect three elements of garment, namely, colors, fabrics and styles, but also effectively deal with the sewing problem between complex patterns.To simulate the draping property of garment, the simulation process was divided into two phases: in the first phase, 3-D garment rigid surface was rapidly generated, and then on the basis of rigid model, X Provot's mass-spring physical model of cloth was introduced to simulate 3-D virtual garment soft surface as the second phase. Meanwhile, the forces of the mass were analyzed in details and the dynamic equation of the cloth model was worked out by Euler method. Combining the physical technique with the geometrical technique, the algorithm effectively dealt with the sewing problem between complex patterns, and reduced the high computation cost of the physical technique. Also proposed was a collision detection algorithm based on axis aligned bounding boxes technique. It improved the speed of 3-D garment simulation greatly. The methods mentioned was realized in a virtual garment try-on system. The result showed the algorithm had the strength of high simulation, high feasibility, and being easy to implement.In order to consummate the demonstration of 3-D garment, this article studied the texture mapping technology and coordinates transformation of graphics which was applied to the demonstration of 3-D garment, and supplied several demonstration drawings after textures mapping. The fact proved that applying texture mapping and graphic transformation technology to the garment strengthened the garment's sense of stereoscopic and artistic.Paper realizes the static performance of customer wearing clothes, using garment 3D model, customer's somatotype information, and customer fashion choices, to try garment on. Moreover, the try-on system needs customers offer 7 feature data, by which the system can get a composed model of garment that customers select, and customers'personalized rendering, to let customer appreciate. |
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