1. A computer-implemented method for generating a surface representation of an item, the method comprising: identifying, for a point on an item in an animation process, at least first and second transformation points corresponding to respective first and second transformations of the point, each of the first and second transformations representing an influence on a location of the point of respective first and second joints associated with the item; determining an axis for a cylindrical coordinate system using the first and second transformations; performing an interpolation of the first and second transformation points in the cylindrical coordinate system to obtain an interpolated point; and recording the interpolated point in a surface representation of the item in the animation process