Abstract
This paper describes a solid deformation method, composed free-form deformation (CFFD), which applies a sequence of uniform periodic B-spline FFDs over 3D Euclidean space. The construction of the individual FFDs, which are defined by unbounded control lattices, is described, concentrating on a method by which feature point trajectories are employed to control lattice point displacements. Problems due to mutual influence of feature point trajectories are discussed, and frozen points, which inhibit deformation in their proximity, are introduced. Also, methods for constructing the FFD lattices are proposed which control mutual influence of feature point trajectories. The paper addresses computational issues of constructing and applying CFFDs, and discusses the application of CFFD to 3D design and animation.
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