An efficient physically based surface sculpting method is presented in this paper for the interactivedeformation of n-sided surfaces. By minimizing an energy functional, the user is able to deform a surface byapplying different forms of forces directly, acting as virtual sculpting tools. The user is also able to define necessarygeometric constraints, so as to further control the surface shape. Compared with the traditional method that asurface is deformed by moving the control points, this method is much more intuitive and still is very efficient.