The visual appearance of materials depends on their intrinsic light transfer properties, the illumination and camera conditions, and other environmental factors. This is in particular the case of porous, rough, or absorbent materials, where the presence of liquid on the surface alters significantly their BRDF, which in turn results in considerable changes in their visual appearance. For this reason, rendering materials change their appearance when wet continues to be a relevant topic in computer graphics. This is especially true when real-time photo-realistic rendering is required in scenes involving this kind of materials in interaction with water or other liquids. In this paper, we introduce a physically inspired technique to model and render appearance changes of absorbent materials when their surface is wet. First, we develop a new method to solve the interaction between the liquid and the object surface using its own underlying texture coordinates. Then, we propose an algorithm to model the diffusion phenomenon that occurs in the interface between a solid porous object and a liquid. Finally, we extend a model that explains the change of appearance of materials under wet conditions, and we implement it achieving real-time performance. The complete model is developed using GPU acceleration.

中文翻译：

---

用于模拟湿吸收材料的物理启发技术

材料的视觉外观取决于其固有的光传输特性、照明和相机条件以及其他环境因素。多孔、粗糙或吸收性材料尤其如此，其中表面上存在液体会显着改变其 BRDF，进而导致其视觉外观发生相当大的变化。出于这个原因，渲染材料在潮湿时会改变它们的外观，这仍然是计算机图形学中的一个相关主题。在涉及此类材料与水或其他液体相互作用的场景中需要实时照片级逼真渲染时尤其如此。在本文中，我们介绍了一种受物理启发的技术来模拟和渲染表面潮湿时吸收材料的外观变化。第一的，我们开发了一种新方法，使用其自身的底层纹理坐标来解决液体和物体表面之间的相互作用。然后，我们提出了一种算法来模拟发生在固体多孔物体和液体之间的界面中的扩散现象。最后，我们扩展了一个解释潮湿条件下材料外观变化的模型，并实现了它的实时性能。完整的模型是使用 GPU 加速开发的。我们实施它以实现实时性能。完整的模型是使用 GPU 加速开发的。我们实施它以实现实时性能。完整的模型是使用 GPU 加速开发的。