引用本文:周波,赵宇辉,赵吉宾,田同同.由彩色3D打印路径实现乐高模型体素化∗[J].中国表面工程,2021,34(2):131~137
Zhou Bo,Zhao Yuhui,Zhao Jibin,Tian Tongtong.Voxel Generation Method of LEGO Model by 3D Color Printing Path[J].China Surface Engineering,2021,34(2):131~137
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由彩色3D打印路径实现乐高模型体素化∗
周波1,2, 赵宇辉1,2, 赵吉宾1,2, 田同同1,2
1.中国科学院沈阳自动化研究所 沈阳 110016;2.中国科学院机器人与智能制造创新研究院 沈阳 110169
摘要:
介绍了一种从 3D 彩色打印轨迹转换为大型乐高模型体素化的算法。 首先,考虑三维模型的颜色可能非常多,但并不是任何颜色乐高颗粒都能提供,因此对乐高模型的颜色进行精简。 其次,由路径穿过乐高单元块所包围的面积及单元块内的路径长度,确定单元块的有效位置及颜色。 进而,通过角度判断方法,对层与层之间的空隙进行填充,以实现乐高模型体素化的 “水密性”特征。 最后,提供复杂的模型来证明所提方法的有效性:与传统体素法相比,所提出的算法仅消耗接近 20%的计算时间。 所提出的方法突破了传统体素法需要在模型上采样大量点进行颜色计算,且模型内外结构的判断存在计算量大等缺陷,仅通过彩色打印轨迹就实现了模型体素化的快速转换,针对大型模型的快速体素化需求具有良好的应用前景。
关键词:  3D 彩色打印  体素  乐高  水密
DOI：10.11933/j.issn.1007-9289.20201231001
分类号:TG156;TB114
基金项目:国家重点研发计划(2018YFB1105300)、国家自然科学基金(51605475)和中央引导地方科技发展专项资金(2021JH6 / 10500123)资助项目
Voxel Generation Method of LEGO Model by 3D Color Printing Path
Zhou Bo1,2, Zhao Yuhui1,2, Zhao Jibin1,2, Tian Tongtong1,2
1.Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016 , China;2.Institutes for Robotics and Intelligent Manufacturing, Chinese Academy of Sciences, Shenyang 110169 , China
Abstract:
An algorithm was introduced for converting a 3D color printing trajectory to a large-scale Lego model voxelization. First of all, considering that there may exist many different types of colors of the 3D model, some of them cannot be provided by LEGO, and the color of the LEGO model has to be simplified. Secondly, the path passes through the area surrounded by the LEGO unit block and the inside of the unit block, and the path length can be used to determine the effective position and the color of the unit block. Further- more, by implementing the angle judgment method, the gap between the layers is filled to realize the " watertight" feature of the Lego model voxelization. Finally, complex models are provided to prove the effectiveness of this method. This method breaks through the tra- ditional voxel method that needs to sample a large number of points on the model for color calculation, and the judgment of the internal and external structure of the model has defects such as large calculation volume. Only through the color printing trajectory, the rapid conversion of the model voxelization is realized. The rapid voxelization requirements of the model have good application prospects.
Key words:  3D color printing  voxel  Lego  watertight
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