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Simulation of origami is very important for representing or designing origami via computer. It helps paperfolders to understand the structure of origami models and can be used as a tool for designers to draw diagrams. We propose a system for simulating the folding process from a given crease pattern to the folded base, based on rigid origami simulation (Figure 1). There have been several approaches for simulating origami. One way is to simulate origami by a sequence of simple folding steps as shown by Miyazaki et al.[5]. Since the final state of an origami model is represented by folding steps, it is easy to reconstruct an animation progressing from a sheet of paper to the finished model. However, the origami models that can be represented in this system are limited by an enforced simplicity of the individual folding steps, and this approach is not suitable for many complex origami models whose folding process …