Interpolation of Subdivision Features for Curved Geometry Modeling. (April 2022)

• Record Type: Journal Article
• Authors: Jiménez-Ramos, Albert; Gargallo-Peiró, Abel; Roca, Xevi
• Is Part Of: Computer aided design. Volume 145(2022)
• Publication Date: 2022-04
• Subjects: Mesh curving -- Surrogate geometry -- Geometry modeling -- Subdivision -- Blending; Computer-aided design -- Periodicals; Engineering design -- Data processing -- Periodicals; Computer graphics -- Periodicals; Conception technique -- Informatique -- Périodiques; Infographie -- Périodiques; Computer graphics; Engineering design -- Data processing; Periodicals; Electronic journals; 620.00420285
• DOI: 10.1016/j.cad.2021.103185
• Languages: English
• ISSNs: 0010-4485

Abstract

Abstract: We present a nodal interpolation method to approximate a subdivision model. The main application is to model and represent curved geometry without gaps and preserving the required simulation intent. Accordingly, we devise the technique to maintain the necessary sharp features and smooth the indicated ones. This sharp-to-smooth modeling capability handles unstructured configurations of the simulation points, curves, and surfaces. The surfaces correspond to initial linear triangulations that determine the sharp point and curve features. The method automatically suggests a subset of sharp features to smooth which the user modifies to obtain a limit model preserving the initial points. This model reconstructs the curvature by subdivision of the initial mesh, with no need of an underlying curved geometry model. Finally, given a polynomial degree and a nodal distribution, the method generates a piece-wise polynomial representation interpolating the limit model. We show numerical evidence that this approximation, naturally aligned to the subdivision features, converges to the model geometrically with the polynomial degree for nodal distributions with sub-optimal Lebesgue constant. We also apply the method to prescribe the curved boundary of a high-order volume mesh. We conclude that our sharp-to-smooth modeling capability leads to curved geometry representations with enhanced preservation of the simulation intent. Graphical abstract: Highlights: Interpolation of subdivision models with any degree and distribution. Evidence of geometrical convergence rate for sub-optimal nodal distributions. Featuring a unique all-in-one sharp-to-smooth modeling capability. Automatically assisting the user to prescribe the simulation intent. Readiness to prescribe the boundary of a high-order volume mesh.