PRESERVACIóN AUTOMáTICA DE DISCONTINUIDADES DE SUPERFICIE BASADA EN LA ESTIMACIóN DE LA TORSIóN DE CURVAS DE CONTORNO PARA LA RECONSTRUCCIóN DE OBJETOS TRIDIMENSIONALES

different methods for fitting surfaces from dispersed data interpolation assume the reconstructed surface does not have any type of discontinuity. discontinuities in the surfaces are obtained from the original shape of the object and they appear mainly in the acquisition process due to occlusion problems. for digital representation of surfaces with discontinuities is commonly found an additional manual process, which is applied after the final stage of fitting surface. in this paper, two methods are proposed, one of them with the aim of detect and preserve discontinuities in surfaces with arbitrary topology, and the other one to reduce the amount of points to be interpolated, decreasing the computational cost. initially, the method carries out a classification based on estimation of the torsion variance of the contour curve. when the holes contour has very low values of variances, it is considered that this hole must be preserved. then, the surface described by the selected set of points is interpolated using radial basis functions. finally, the generated surface is trimmed with each contour identified like preservable.