Analytical C 2 Continuous Surface Blending

Xiangyu You (), Feng Tian, Wen Tang, Jian Chang and Jianjun Zhang
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Xiangyu You: Department of Creative Technology, Faculty of Science and Technology, Bournemouth University, Poole BH12 5BB, UK
Feng Tian: Division of Natural and Applied Sciences, Duke Kunshan University, Kunshan 215316, China
Wen Tang: Department of Creative Technology, Faculty of Science and Technology, Bournemouth University, Poole BH12 5BB, UK
Jian Chang: National Centre for Computer Animation, Faculty of Media and Communications, Bournemouth University, Poole BH12 5BB, UK
Jianjun Zhang: National Centre for Computer Animation, Faculty of Media and Communications, Bournemouth University, Poole BH12 5BB, UK

Mathematics, 2024, vol. 12, issue 19, 1-22

Abstract: Surface blending is an important topic in geometric modelling and is widely applied in computer-aided design and creative industries to create smooth transition surfaces. Among various surface blending methods, partial differential equation (PDE)-based surface blending has the advantages of effective shape control and exact satisfaction of blending boundary constraints. However, it is not easy to solve partial differential equations subjected to blending boundary constraints. In this paper, we investigate how to solve PDEs analytically and develop an analytical PDE-based method to achieve surface blending with C 2 continuity. Taking advantage of elementary functions identified from blending boundary constraints, our proposed method first changes blending boundary constraints into a linear combination of the identified elementary functions. Accordingly, the functions for blending surfaces are constructed from these elementary functions, which transform sixth-order partial differential equations for C 2 surface blending into sixth-order ordinary differential equations (ODEs). We investigate the analytical solutions of the transformed sixth-order ordinary differential equations subjected to corresponding blending boundary constraints. With the developed analytical PDE-based method, we solve C 2 continuous surface blending problems. The surface blending example presented in this paper indicates that the developed method is simple and easy to use. It can be used to effectively control the shape of blending surfaces and at the same time exactly satisfy C 2 continuous blending boundary constraints.

Keywords: surface blending; C 2 continuity; sixth-order partial differential equation; closed-form solution (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2024
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