Approach to Cloth Synthesis and Visualization

Vladimir L. Volevich, Edward A. Kopylov,

Andrei B. Khodulev, Olga A. Karpenko

Moscow, 1997

Contents Introduction Cloth Structure Explicit Cloth Model Ray Tracing Results and Images Conclusions and Future Work Acknowledgements References

CLOTH STRUCTURE

As it is known textiles are made up of yarns. Every yarn consists of elementary fibers. Yarns can be combined in different ways and that causes a variety of textile structures. There are two basic cloth structures stemming from the process of its manufacturing: woven and knitted fabrics. In the knitwear all yarns are oriented in the same direction. This paper concerns woven materials.

In woven fabrics yarns are oriented in two mutually orthogonal directions. Longitudinal (warp) and transverse (weft) yarns can be interlaced in many ways and have different thickness and density. They form smooth or rough surface on the right side of the cloth and are more or less filled with fibrous material. Each yarn consists of several micro-fibers and they can twist around the yarn axis. In particular case it can be parallel bunch of micro-fibers (Fig. 1a). The more complicated model is in the cloth sample in Fig. 1b.

Fig.1(a),(b). Woven textiles received via scanning electronic

microscope Hitachi S800.

So the main characteristics of woven fabrics are thickness and structure of yarns, a kind of interlacement, a density, and several geometric parameters. The cloth structure influences its appearance and properties.
The most cloth simulation algorithms are based on supposition that any woven object has regular and periodic structure specified by micro-element [1, 3, 5]. It can be defined by interlacing matrix. For example, interlacing structure and matrix for the cloth sample in Fig. 1a will look something like this:

- warp

- weft

Fig.2. Interlacing structure and matrix.

As for optical properties we suppose that fibers are typical dielectrics and the radiance reflected from and transmitted through a fiber boundary is given by the classic Fresnel's equations. A fiber is translucent, and it reflects light and refracts it as well. Its behavior is determined by the refraction index, the reflection and the transmission in every wavelength band per unit length (i.e. surface and volume absorption).

Contents Introduction Cloth Structure Explicit Cloth Model Ray Tracing Results and Images Conclusions and Future Work Acknowledgements References


© Copyright 1997 Vladimir L. Volevich, Edward A. Kopylov, Andrei B. Khodulev, Olga A. Karpenko. - All Rights Reserved	[Home]