3 - d virtual sphere technique is used to realize the function of interactive rotation and picking method based on parallel perspective is used to realize the special characteristic points picking , so the design of 3 - d interaction is completed 本文使用三維跟蹤球技術(shù)實(shí)現(xiàn)對(duì)被測(cè)物體的交互旋轉(zhuǎn)功能,使用平行透視下的拾取機(jī)制實(shí)現(xiàn)被測(cè)物體上特征點(diǎn)的選取,完成了三維交互設(shè)計(jì)。