1. A computer-implemented method comprising: receiving a quadratic mesh and a skeletal model for sequential frames of a range camera; performing segmentation of the quadratic mesh into defined body regions by using parameters of the skeletal model, the segmentation providing data points forming a data-set of each defined body region; accumulating histograms for the data-sets of each defined body region; filtering the histograms to generate a data estimate; and generating a fitted tensor-spline model using the data estimate to perform tensor-spline fitting for the data estimate.