繊維機械学会誌

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In the computer graphic (CG) technology for indication of three-dimensional (3D) image of fabric surface, there is no indication method based on measured information to express precisely the fabric textures with reflection of anisotropy. We analyzed the regulations of the reflection on fabric surface with anisotropy, and tried to express the results by CG. Two kinds of twill woven and the plain woven are chosen as the sample. We think fabric surface consists of many tiny surfaces with different attitude of surface. This surface attitude was indicated using γ of tilt angle (similar incident angle), and θ of angle between warp direction and tilt direction. Surface textures were extracted from measured images with various attitudes (γ, θ). A texture consists of character of luminance such as reflection luminosity, irregularity of luminosity, and a diagonal pattern. From the results, the relationships among three characters and attitude (γ, θ) was understood. Texture was generated using look-up-table calculated with interpolation method from measured data. Also, fabric surface image with reflection of anisotropy by 3D-CG was generated using texture-mapping method with volume texture. When three kinds of generated images are compared with other images, it is clear that the texture with reflection of anisotropy is expressed.

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We examined the method which creates the three-dimensional model of woven fabric structures from a weave diagram. Consequently, three-dimensional modeling of the fabric structure corresponding to the expression of three-dimensional structures, such as a honeycomb weave or a multi-layered weave. This was attained by using the method of triggering the floating point number of each yarn for the height position. It enabled this to visualize the three-dimensional structure of fabric, which is only from the information of weave diagrams. This was implemented without the use of mathematical knowledge nor three-dimensional graphics technology.

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