A method of determining neighboring voxels that contribute to a surface of an object includes evaluating a primary voxel that corresponds to a side of a reference voxel. The top coating is stable to lens processingstorage and confers lubricity to the lens. The deformable connecting element is connected to the bracing element. The lid is pivotally connected to an upper edge of the fixed frame, so as to be swiveled relative to the fixed frame for covering the fan, and the lid is engaged with the movable frame simultaneously, so as to holding the fan in the containing space. Various novel surgical instruments, such as a telescoping articulating reamer and a talocalcaneal jig, which facilitate the novel surgical method, are also described.