期刊
COMPUTER AIDED GEOMETRIC DESIGN
卷 48, 期 -, 页码 17-35出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cagd.2016.07.003
关键词
CAD model; Trimmed NURBS; Non-uniform subdivision
资金
- Engineering and Physical Sciences Research Council [EP/E025889/1, EP/H030115/1] Funding Source: researchfish
- EPSRC [EP/H030115/1, EP/E025889/1] Funding Source: UKRI
CAD models generally consist of multiple NURBS patches, both trimmed and untrimmed. There is a long-standing challenge that trimmed NURBS patches cause unavoidable gaps in the model. We address this by converting multiple NURBS patches to a single untrimmed NURBS-compatible subdivision surface in a three stage process. First, for each patch, we generate in domain space a quadrangulation that follows boundary edges of the patch and respects the knot spacings along edges. Second, the control points of the corresponding subdivision patch are computed in model space. Third, we merge the subdivision patches across their common boundaries to create a single subdivision surface. The converted model is gap-free and can maintain inter-patch continuity up to C-2. (C) 2016 Elsevier B.V. All rights reserved.
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