Research On Simulation Of Loop Pile Tufted Carpet Base On Open Inventor

In recent years, fabric designers are unsatisfied with the CAD/CAM system for woven fabric, for it is not able to provide a live image of the appearance of the fabric designed, and the system can only display part of the fabrics with 2D image. Therefore, the software engineers are trying to develop advanced system to provide a vivid 3D image for various woven fabrics; this is the purpose of the research project.The goal of the research is the modeling and simulation of the geometrical appearance of yarn and tufted carpet in a 3D manner. The knowledge of carpet, theory of computer graphics and object-oriented programming technique is employed, and 3D geometric property of loop pile in the fabric is thoroughly investigated. Loop pile modeling and rendering technique is developed based on the theories of carpet geometry and mechanics. Specific researches are as follows:The yarn model is focused on some main factors, such as color, count, twist, direction of twist and illumination. The 3D geometry model of yarn is established through yarn stress model, the trajectory of centerline of yarn, combining Peirce model of the transverse geometric features. The basic lightening and material model of yarn is also employed to simulate the illumination of yarn in the physical world.The loop pile model is established based on the simplified loop pile composing of a single yarn and thinning hair circle surface detail. Loop pile in the carpet won't be evenly arranged regularly as in the design paper; the loop pile may bend, move forward or back ward, move up or down even overlapped between the high and low loop pile. In the overall effect of the carpet simulation, these factors must be taken into consideration.Phong shading model and Open Inventor are used in the project. Furthermore, texture mapping technology is also used to reflect the twist, roughness and other characters on the surface of the yarn to enhance the rendered image. By changing the camera, the image can be observed from different point of view.Comparing with the simulation result and the picture of the carpet, the 3D image could reflect the pattern just because of the height difference. The 3D simulation of tufted carpet is both feasible and effective, which is better than plane simulation.