Weathering, referring to techniques for depicting outdoor objects as having suffered rain and wind damage, has a long history of research, and many methods can be found in the literature. Metal is a representative target of weathering, as metallic surface corrosion is a widespread deterioration phenomenon in our daily life. However, few weathering methods consider the effects of rust-preventive paint, while real metal is usually treated with a preservative. This paper presents a novel procedural method for weathering coated metal objects. In our method, a coated surface is imposed on a 3D triangular mesh. We enable the mechanical deterioration of coating film, and we deform the mesh model to express cracking and peeling. As further defacing elements on the coating film, runoff rust and darkening are reproduced by changing the color and reflectance of the surface. Besides, by locally adjusting the control parameters of the designated areas on the surface, the process of deterioration can be arbitrarily directed. Several visual simulation results are shown to prove empirically the faithfulness of the proposed methods.

中文翻译：

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风化涂层金属物体的视觉模拟

风化，是指将室外物体描绘成遭受风雨破坏的技术，研究历史悠久，文献中可以找到很多方法。金属是风化的代表对象，因为金属表面腐蚀是我们日常生活中普遍存在的劣化现象。然而，很少有风化方法考虑防锈漆的效果，而真正的金属通常经过防腐剂处理。本文提出了一种新的程序方法来使涂层金属物体老化。在我们的方法中，涂层表面被施加在 3D 三角形网格上。我们启用涂膜的机械劣化，并通过变形网格模型来表达开裂和剥落。作为涂膜上的进一步污损元素，通过改变表面的颜色和反射率来再现径流锈蚀和变暗。此外，通过局部调整表面指定区域的控制参数，可以任意引导劣化过程。显示了几个视觉模拟结果，以从经验上证明所提出方法的真实性。