1. A process for generating a three-dimensional image of an individual comprising: on a user interface of a computer, generating a morphable head model composed of a number of local eigenfeatures, and with said user interface, manipulating any of said local eigenfeatures to selectively modify said head model to better conform to said individuals, in which manipulating any of said local eigenfeatures includes ensuring that splice edges of a number of adjacent eigenfeatures have similar contour shapes and similar first and second derivatives.