Recent work concerns non-planar data.
Work for planar data has been incorporated into a scheme for reconstructing surfaces from data given on cross-sections. Further theoretical properties of the shape of curves and surfaces have been studied, in particular with respect to totally positive matrices where there has been collaboration with mathematicians in Zaragoza, Spain. Multiresolution and Wavelets Spline functions can be refinable, which is a crucial property in the construction of wavelets. Much recent work has been on the construction and classification of refinable spline functions. Press, Nashville, 2000.