The length of an object's skeleton usually remains constant when it is deformed. This paper presents an arc-length preserving deformation based on subdivision. Discrete the curve into a polyline, then the polyline is deformed with its arc-length preserved in the sense of minimizing energy. Subdivision method is applied to obtain a smooth curve (at least C{sup}1 smooth) with proper weights selected to keep the length of the resulting curve equal to the original curve. This technique also provides interactive response by progressively refining the solution of the optimization problem.
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