| http://www.w3.org/ns/prov#value | - In this example, the number of vertices of the original model shown in FIG. 11A is reduced by 60% each by the number of vertex comparison, so that approximation is performed as shown in FIGS. 11B to 11D. In such approximation, by performing approximation including normal vectors as described above so as to carry out smooth shading in displaying the approximated model, the entire model may be drawn
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