1. A method for processing three-dimensional digital mesh images representations of three-dimensional subjects, said method comprising: slicing said three-dimensional digital mesh representation with a frontal imaginary plane that divides the three-dimensional digital mesh representation into anterior and posterior sections; slicing said three-dimensional digital mesh representation with a sagittal imaginary plane extending vertically through said three-dimensional digital mesh representation dividing said three-dimensional digital mesh representation into left and right sections, said frontal imaginary plane intersecting said sagittal imaginary plane; and using a spline function to fit smoothed splines to selected ones of said anterior and posterior sections and said left and right sections.