To bridge the gap between form and function, this 3D modeling tool utilizes a cylindrical lattice to alter the surface contours of a surfboard. The application of a cylindrical lattice extends on free-form deformation (FFD), through which a design object is encased inside a lattice structure that can be deformed to alter the design object. FFD is an efficient and intuitive method of three-dimensional shape design and modification and many types of deformations are possible. However, the parallelepiped (box-shaped) structure of the lattice does limit the range of deformation that is possible. This limitation is resolved with extended free-form deformation (EFFD), which introduces a non-parallelepiped lattice structure, such as a cylindrical lattice.