However, three-dimensional animations cannot be first painted by hand and then scanned in, but must be produced entirely on the computer. They present a different challenge.
至於無法用手繪後掃瞄入電腦、必須完全在電腦上製作（即所謂「全電腦生成」，computer-generated，CG）的三Ｄ立體動畫，面臨的又是另一種難題。