A practical microcylinder appearance model for cloth rendering

Abstract

This article introduces a practical shading model for cloth that can simulate both anisotropic highlights as well as the complex color shifts seen in cloth made of different colored threads. Our model is based on extensive Bidirectional Reflectance Distribution Function (BRDF) measurements of several cloth samples. We have also measured the scattering profile of several different individual cloth threads. Based on these measurements, we derived an empirical shading model capable of predicting the light scattering profile of a variety of threads. From individual threads, we synthesized a woven cloth model, which provides an intuitive description of the layout of the constituent threads as well as their tangent directions. Our model is physically plausible, accounting for shadowing and masking by the threads. We validate our model by comparing predicted and measured light scattering values and show how it can reproduce the appearance of many cloth and thread types, including silk, velvet, linen, and polyester. The model is robust, easy to use, and can simulate the appearance of complex highlights and color shifts that cannot be fully handled by existing models.

Fitting procedural yarn models for realistic cloth rendering

“…Traditionally, fabrics are treated as infinitely thin 2D sheets. Many surface reflectance models have been proposed to model fabric appearance [Irawan and Marschner 2012;Sadeghi et al 2013]. Although these models provide high-quality renderings for fabrics viewed from a distance, they lack the power to closely reproduce the appearance of fabrics with thick yarns or fuzzy silhouettes, or the generality to handle different fabrics with wildly varying appearances.…”

Modelling and Visualisation of the Optical Properties of Cloth

“…In the researches, Ashikmin [10], Irawan and Marschner [11] and Sadeghi [12,13] used surface representation of fabric geometry that included functions such as BRDF, BSDF and the collection of various texture data.…”

“…The researches performed by Sadeghi and his colleagues [12,13] present the appearance models for visualisation of microstructures. In the last part of the dissertation [12], after the presentation of the models for rendering rainbows and hair, appearance model for rendering cloth is introduced.…”

Effective Acquisition of Dense Anisotropic BRDF

“…8. The second model [20] is based on physics of light scattering in cylindrical threads of fibers and achieves anisotropy by application of a user defined weaving pattern of two threads together with parameters of their reflectance model. A drawback of this model is a complicated application of parameter optimization techniques; therefore, derivation of appropriate parameters of individual threads is left completely to users and their experience.…”