But when the animation has to be integrated with 3D images, the arm cannot simply disappear, but has to be extended further backward to appear natural. Thus the angle at which the arm is waved has to be increased, but this is at odds with the original aesthetic effect. In the end the two departments inevitably have to negotiate and each make concessions.
然而和三Ｄ畫面合成時，那隻手不可能憑空消失，必須要再往後延伸擺盪才顯得自然，如此一來，揮出去的角度勢必加大，不符合原先預設的美學效果，最後兩個部門免不了討價還價，各退一步。