We propose a new method to design the unfolded patterns of 180-degree flat fold Origamic Architecture models. The Origamic Architecture is a piece of folded paper from which a three dimensional structure“pops up”when it is opened. It sounds like the“Pop Up story book”. The 180-degree flat fold Origamic Architecture consists of pieces of paper. Each pieces has slits for connection and figure of the cross sections of a 3 D model. The pieces are combined to form a lattice structure when they are viewed from the top. Such lattice structures can be folded when they consists of parallel links. It shows that the Origamic Architecture can be folded. In our method, we calculate the cross sections of a 3 D polygonal model first, and then place slits for combination on them. The unfolded patterns and layout drawings are generated on a base-board automatically. We implemented a system based on this method and demonstrated its usefulness for creating 180 degree flat fold Origamic Architectures.

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The formal reading procedure of engineering graphics is necessary to understand a solid from a pictorial drawing. We had the experiment that students read the size of a solid from a drawing. Students who didn't know the rule of projection understood the solid using an informal procedure. Students' cognitive processes were different from a formal reading procedure and an informal reading procedure. Students who used a formal procedure paid attention to information of coordinate system described in a drawing, and restored a position of vertex and size of the solid using a coordinate. On the other hand, students who used an informal procedure paid attention to information of edges and angles described in a drawing. They misunderstood the property of figure was kept in a drawing. They were confident that the true length, the true angle or the true shape were recorded in a drawing. Their typical reading error was that a solid recorded by a congruent figure in a drawing.

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