Approximate T-spline surface skinning

  • Authors:
  • Xunnian Yang;Jianmin Zheng

  • Affiliations:
  • Department of Mathematics, Zhejiang University, China;School of Computer Engineering, Nanyang Technological University, Singapore

  • Venue:
  • Computer-Aided Design
  • Year:
  • 2012

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Abstract

This paper considers the problem of constructing a smooth surface to fit rows of data points. A special class of T-spline surfaces is examined, which is characterized to have a global knot vector in one parameter direction and individual knot vectors from row to row in the other parameter direction. These T-spline surfaces are suitable for lofted surface interpolation or approximation. A skinning algorithm using these T-spline surfaces is proposed, which does not require the knot compatibility of sectional curves. The algorithm consists of three main steps: generating sectional curves by interpolating data points of each row by a B-spline curve; computing the control curves of a skinning surface that interpolates the sectional curves; and approximating each control curve by a B-spline curve with fewer knots, which results in a T-spline surface. Compared with conventional B-spline surface skinning, the proposed T-spline surface skinning has two advantages. First, the sectional curves and the control curves of a T-spline surface can be constructed independently. Second, the generated T-spline skinning surface usually has much fewer control points than a lofted B-spline surface that fits the data points with the same error bound. Experimental examples have demonstrated the effectiveness of the proposed algorithm.