Simulation of Textile Stains.

Studies on virtual textile have long been an appealing topic in computer graphics and most of the efforts were paid to their distinctive appearances or physically-based simulation. However, stain as one of the most commonly seen phenomena has received little attention so far. This paper introduces techniques for simulating the stain effect on fabric. Based on the microstructure of yarns, we propose a triple-layer model (TLM) to handle the liquid-yarn interaction for the wetting and wicking computation, and we formalize the liquid spreading in woven cloth into two typical actions, the in-yarn diffusion and the cross-yarn diffusion. The dye diffusion is driven by the liquid diffusion and the concentration distribution of pigments. The warp-weft anisotropy is handled by simulation of the yarn's structure in the two directions. Experimental results demonstrate that a wide range of fabric stain phenomenon on different textile materials, such as the water ring effect, the high saturate stain contour, and the dynamic wash away effect, can be simulated effectively without loss of visual realism. The realism of our simulation results is comparable to the pictures taken from the real world.