Now, on the other hand to what everyone is saying, sometimes it’s not necessarily a difficulty curve, though most instances of dynamic action certainly ARE a difficulty issue, another problem that can arise is just needing to take way more time due to all the extra details that need to be added in. That, in of itself adds a layer of complexity and challenge just from that, regardless of the actual “difficulty” level of animating that scene.
Just compare a person walking across the screen with a person walking towards you.
Walking across the screen, the main body of the person is essentially the same in every frame, it is just the arms and legs that need to move as the image of the person is gradually moved sideways.
Walking towards the screen, the whole body is slightly bigger in each frame and would have to be redrawn, the perspective of that person will change with every frame and have to be recalculated, the arms and legs are not only moving but they are also getting nearer so they will have to be recalculated and redrawn for every frame. It is immensely more difficult animating something moving towards or away from you than moving side to side. This is true whether the animation is hand drawn or computer animated.
if you think back to TV cartoons, characters spend most of their time moving side to side. Only rarely do you see them moving to or away from you.
This is an example of the kind of thing that has a big effect on complexity even though you would hardly notice when watching.
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