T-splines and T-NURCCs

@article{Sederberg2003TsplinesAT,
  title={T-splines and T-NURCCs},
  author={Thomas W. Sederberg and Jianmin Zheng and Almaz Bakenov and Ahmad H. Nasri},
  journal={ACM SIGGRAPH 2003 Papers},
  year={2003}
}
This paper presents a generalization of non-uniform B-spline surfaces called T-splines. T-spline control grids permit T-junctions, so lines of control points need not traverse the entire control grid. T-splines support many valuable operations within a consistent framework, such as local refinement, and the merging of several B-spline surfaces that have different knot vectors into a single gap-free model. The paper focuses on T-splines of degree three, which are C2 (in the absence of multiple… 
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