Three Dimensional (3D) Last Data Generation System Design Utilizing SFFD and LFFD

A new last design approach based on the Limb line free form deformation (LFFD) and scalar factor free form deformation (SFFD) is presented in this paper. The proposed last design method utilizes the dynamic trimmed parametric patches for the measured 3d foot data and last 3D data. Furthermore the proposed last data generation system utilizes cross sectional data extracted from 3D foot data. First the last design rule of the LFFD is constructed on the FFD lattice based on foot last shape analysis. Secondly SFFD is considered on the LFFD new lattice based on scale factor deformation. The scale factor is constructed on the boundary edges of polygonized patch and the cross section last data boundary edge of the polygon object. Suppose the two boundary curves have been preprocessed so that they run in the same direction and they forms the SF (scale factor). In addition the control points of FFD lattice are derived using cross sectional data interpolation methods from a finite set of 3D foot data.