单词rotoscope
网络: 转描机；速动观察器；转描技术
you have no choice but to rotoscope the whole sequence, masking out the foreground objects one by one.
你必须吃透整个场景，一个一个地为前景画出遮罩。
The other method involved the actor using an unlit blade throughout, and the rotoscope artist would draw the growing blade.
另一个方法是演员自始自终都用不发光的剑刃，转描机动画家会画上发光的剑刃。