Kazuo Matsufuji

Procedural modeling of leather texture with structural elements

This paper proposes a simple generation method for realistic leather texture. Leather surface consists of five structural elements, which are cristae, sulci, wrinkles, pockets and pores, which characterize the visual impression of the leather texture.We classified structural elements by observing real leather surface. To represent the elements, the method extracts features of real textures in order to generate an outline of each element. Then the method computes each element is three-dimensional shapes by a function which defines a continuous surface. Our method generates detailed leather texture, and is easy to handle, with simple procedures and intuitive parameters.

A procedural modeling of woven textiles with fuzz

The purpose of this article is to propose a procedure for generating woven textiles with fuzz through the modeling of surface staples. The procedure guarantees to control the appearance of fuzz. In woven textiles, fuzz is the result of staples untwisted from the yarns, as shown in Fig. 1(a). Staple is of average length in natural fiber (e.g. wool and cotton), but in silk or chemical fiber its length is shorter. Our modeling procedure also takes into account the arbitrary woven design which creates a quadrilateral mesh formed by warps and wefts, with the exception of gauze and leno weaves (twisting adjacent warps), as shown in Fig. 1 (b) and (c). The procedure improves the representation of woven textile.

Leather texture generation considering sulci flow

This paper introduces a new method for generating leather texture by means of cell simulation considering sulci flow. The cell simulation is based on an analogy of cracks on drying or aging surface. The method uses a mass-spring model for generating sulci flow on a surface of leather. A user can specify a sulcus shape by applying a radial basis function (RBF) for its profile.

Curvature dependent BRDF

Some fabric materials such as denim are made of different colors of warp and weft. As illustrated in Figure 1, a visible ratio of weft from a front view increases as denim bends more. As a result, the reflection property of denim varies depending on its curvature. BRDF[1] is a reflection function that defines the reflectance for any incoming and outgoing direction to represent anisotropic reflection of materials. However, it is impossible to represent curvature dependent reflection properties of materials such as denim using BRDF.