21 pajarola r , sainz m , lario r . extreme splatting : external memory multiresolution point visualization . department of computer science , university of california irvine , 2004 , uci - ics - 04 - 14 . 22 airey j m , rohlf j h , brooks f p jr . towards image realism with interactive update rates in complex virtual building environments 二是考察各個(gè)層次結(jié)點(diǎn)的幾何誤差情況,并為每種幾何誤差記錄序列中最先滿足該誤差要求的層次片段,以便成象時(shí)能很快剔除太粗糙的點(diǎn)數(shù)據(jù),這對于模型的近距離成象是非常有用的。