When making shoe soles, it is necessary to make a surface model for each size (differing by about eight millimeters per size number). For each type and style of shoe, nearly 20 such models are needed (covering sizes six to 18, plus some half-sizes). It can be a very time-consuming process.
寶鈺生技公司經理郭川竹解釋，製作鞋底時，須建構不同號頭（每個號頭約差 0.8 公分）的曲面模型；一個鞋形，從 6 號到 18 號，再加上半號鞋，共需建構近 20 個曲面模型，非常耗時。