首頁 > 期刊首頁 > 計算機輔助設計與圖形學學報 > 2001年5期 > 二次B樣條曲面頂點及法向插值
二次B樣條曲面頂點及法向插值
Interpolation of Vertices and Their Normal Vectors with Quadratic B-Spline Surfaces
- doi:
- 摘要:
- 頂點位置插值是自由曲面造型的基本方法,法向插值在一些CAD/CAM系統中也有重要應用.文中利用子分曲面理論研究雙二次B樣條曲面的性質,在此基礎上利用Doo-Sabin子分模式構造插值頂點位置和法向的雙二次B樣條曲面控制網格,得到插值曲面的參數表示.為了提高效率,對規模較大的網格數據,先把它劃分成若干片子網格,分別求出滿足與子網格相關的插值條件的控制網格. 最后再把它們整合在一起形成完整的控制網格,使得相應的二次B樣條曲面插值所有頂點及法向.
- Abstract:
- Interpolation to vertex positions is an essential issue in surface modeling, and interpolation to normal vectors has also important applications in some CAD/CAM areas. Properties of bi-quadratic B-spline surface are investigated by the subdivision approach, and the control mesh of bi-quadratic B-spline surface is constructed by employing Doo-Sabin subdivision to derive the parametric representation of interpolation surface. For enhancing the efficiency of handling mesh with larger scale data, we first partition the mesh into a number of sub-meshes and compute their corresponding control nets satisfying interpolatory conditions, then the sub-nets are integrated to form a whole net such that its bi-quadratic B-spline surface interpolates all given vertices and normal vectors.
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