Journal of Software:2009.20(3):702-712

(中国科学院 软件研究所 计算机科学国家重点实验室,北京 100190;中国科学院 研究生院,北京 100049;澳门大学 科学技术学院 电脑与资讯科学系,澳门;欧特克软件(中国)有限公司,上海 200127;中国科学院 软件研究所 计算机科学国家重点实验室,北京 100190;澳门大学 科学技术学院 电脑与资讯科学系,澳门)
Simulation of Autumn Leaves
CHI Xiao-Yu,SHENG Bin,YANG Meng,CHEN Yan-Yun,WU En-Hua
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Received:November 21, 2007    Revised:March 14, 2008
> 中文摘要: 提供了一种采样并生成植物叶子表观的方法,可以非常真实地展现叶子秋季在干枯、老化过程中多种纹理、表观属性的变化.在生成叶子纹理的过程中,有别于以往基于单一材质样本的表观合成技术,采集了大量不同叶子样本表面的双向反射分布函数BRDF 和双向透射分布函数BTDF,最终从这些数据中得到叶子衰老过程在老化空间中的表达式和完全分布图.结合植物学知识和所得到的老化空间中的表达式和分布图,可以很好地指导合成秋季不同衰老程度叶子的表观纹理,并能够外插合成采样范围之外的叶子纹理样式.在生成多种不同种类和衰老程度的植物叶子的过程中验证了这种方法的有效性,得到了大量非常接近真实树叶的各种叶子
中文关键词: 老化  纹理合成  叶子
Abstract:This paper presents a method for capturing and efficiently simulating of a large number of plant leaves,realistically showing their weathering process in autumn time with various texture patterns and appearances. Ingenerating the texture patterns of leaves, different from the existing technique that models the appearance manifoldsfrom a single input material sample, this paper captures the BRDF and BTDF properties of leaf surface frommultiple various samples, which contribute to a final complete aging manifold representing the appearance changethrough the aging process of the leaves. Combining this aging manifold representing with botanical knowledge, itcan synthesize many different leaves’ appearance and textures and extrapolate texture patterns out of input samples.The effectiveness of this method is proved in several applications, including subjects with different ages and types.In most cases, it is able to re-produce texture patterns consistent with those observed in nature.
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基金项目:Supported by the National Basic Research Program of China under Grant No.2002CB312102 (国家重点基础研究发展计划(973)) Supported by the National Basic Research Program of China under Grant No.2002CB312102 (国家重点基础研究发展计划(973))
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CHI Xiao-Yu,SHENG Bin,YANG Meng,CHEN Yan-Yun,WU En-Hua.Simulation of Autumn Leaves.Journal of Software,2009,20(3):702-712