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Simple Method for Constructing NURBS Surfacesfrom Unorganized Points

Nallig Leal, Esmeide Leal, John William Branch

Proceedings, 19th International Meshing Roundtable, Springer-Verlag, pp.161-176, October 3-6 2010

IMR
PROCEEDINGS

19th International Meshing Roundtable
Chattanooga, Tennessee, USA.
October 3-6, 2010

Universidad AutÛnoma del Caribe
Calle 90 No 46 - 112
Tel. 57-5-3671286
Barranquilla - Colombia - SuramÈrica
{nleal,esleal}@uac.edu.co

Summary
In this paper, a new method for constructing NURBS surfaces from scattered and unorganized points is presented. The method is easy to implement and allows fitting a NURBS surface to a scattered point cloud without constructing either NURBS patches networks or polygon meshes. Based on the projection of the points onto the regression plane of the cloud, the method detects both regions where the cloud lacks points, and regions where the cloud is too dense. Then, by inserting and removing points, the point cloud is regularized and approximated by a NURBS surface. In order to reduce the approximation error, an evolutionary strategy obtains the weights of the NURBS surface so that the distance between the point cloud and the NURBS is minimal. Finally, the points inserted outside the bounds of the point cloud are removed by trimming the NURBS surface. Numerical and graphical results are provided, demonstrating that the method produces valid surfaces with low fitting error.

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