《计算机应用》唯一官方网站 ›› 2025, Vol. 45 ›› Issue (6): 1963-1970.DOI: 10.11772/j.issn.1001-9081.2024060850

• 多媒体计算与计算机仿真 • 上一篇    

基于高维拟共形映射的三维区域参数化方法

宋媛媛, 潘茂东()   

  1. 南京航空航天大学 数学学院,南京 211106
  • 收稿日期:2024-06-24 修回日期:2024-09-11 接受日期:2024-09-14 发布日期:2024-09-25 出版日期:2025-06-10
  • 通讯作者: 潘茂东
  • 作者简介:宋媛媛(2001—),女,江苏淮安人,硕士研究生,CCF会员, 主要研究方向:计算几何与计算机图形学
    潘茂东(1990—),男,江苏东台人,副教授,博士,主要研究方向:计算几何与计算机图形学、CAD/CAE一体化、网格生成。maodong@nuaa.edu.cn
  • 基金资助:
    国家自然科学基金资助项目(12101308);国家重点研发计划青年科学家项目(2022YFB3302900)

3D domain parameterization method based on high-dimensional quasi-conformal mapping

Yuanyuan SONG, Maodong PAN()   

  1. School of Mathematics,Nanjing University of Aeronautics and Astronautics,Nanjing Jiangsu 211106,China
  • Received:2024-06-24 Revised:2024-09-11 Accepted:2024-09-14 Online:2024-09-25 Published:2025-06-10
  • Contact: Maodong PAN
  • About author:SONG Yuanyuan, born in 2001, M. S. candidate. Her research interests include computational geometry and computer graphics.
    PAN Maodong, born in 1990, Ph. D., associate professor. His research interests include computational geometry and computer graphics, integrated CAD/CAE, mesh generation.
  • Supported by:
    National Natural Science Foundation of China(12101308);National Key Research and Development Program of China for Young Scientists(2022YFB3302900)

摘要:

针对等几何分析中给定边界条件后构造复杂三维(3D)计算域的高质量参数化问题,提出一种基于高维拟共形映射理论的3D区域参数化方法。该方法的核心是建立一个非线性优化模型,同时描述映射的双射性、角度扭曲和体积扭曲。首先,利用高维拟共形映射理论推导出新的衡量3D空间角度扭曲的公式;其次,在优化模型中引入指数变量和体积常数,利用雅各比矩阵的几何意义,实现在保持映射双射性的同时加入体积扭曲的目标;最后,结合交替方向乘子法(ADMM)框架与L-BFGS (Limited-memory Broyden-Fletcher-Goldfarb-Shanno)方法,将原问题分解为易于处理的子问题并交替求解它们。实验结果表明,所提方法在实验模型上保证了全局双射性;相较于ADMM-LRP (ADMM algorithm for Low-Rank Parameterization),所提方法在正交性上提高了约5.8%;相较于TTS (Tet-To-Spline optimization strategy),所提方法在体积一致性上提高了约34.4%。可见,所提方法能获得高质量的参数化,确保双射性,并减小角度扭曲和体积扭曲。

关键词: 等几何分析, 体参数化, 高维拟共形映射, 双射性, 角度扭曲, 体积扭曲

Abstract:

Aiming at the high-quality parameterization problem of constructing a complex Three-Dimensional (3D) computational domain with given boundary conditions in isogeometric analysis, a 3D domain parameterization method based on high-dimensional quasi-conformal mapping was proposed. The core of the proposed method is to establish a nonlinear optimization model that describe the bijectivity, angular distortion, and volume distortion of the mapping simultaneously. Firstly, the high-dimensional quasi-conformal mapping theory was used to derive a new formula for measuring angular distortion in 3D space. Then, exponential variable and volume constant were introduced into the optimization model, and geometrical meaning of the Jacobi matrix was exploited to achieve the goal of adding volume distortion while preserving mapping bijectivity. Finally, Alternating Direction Method of Multipliers (ADMM) framework was combined with L-BFGS (Limited-memory Broyden-Fletcher-Goldfarb-Shanno) method to decompose the original problem into tractable subproblems and they were solved alternatively. Experimental results show that the proposed method guarantees global bijectivity on the experimental model; the proposed method has the orthogonality increased by about 5.8% compared to ADMM-LRP (ADMM algorithm for Low-Rank Parameterization), and has the volume uniformity improved by about 34.4% compared to TTS (Tet-To-Spline optimization strategy). It can be seen that the proposed method achieves high-quality parameterization, ensures bijectivity of mapping, and reduces angular distortion as well as and volume distortion.

Key words: isogeometric analysis, volumetric parameterization, high-dimensional quasi-conformal mapping, bijectivity, angular distortion, volume distortion

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