Abstract
Today's photorealistic rendering techniques can produce very impressive images. But the rendered objects are often too clean and too shining. In this paper, we propose a physically-based model to simulate the appearance of layered patinas on ancient Chinese bronzes. Been buried in soil for thousands of years, there are a lot of patinas on the surfaces of ancient bronzes due to the aging processes and physical and chemical conditions of soil environment. In this model, based on the environmental factors and object geometry, we modulate the development of patinas by L-systems according to these tendencies. We also demonstrate our procedual approach on the ancient Chinese bronzes founded at San-hsing-tui.
