3D technology has meant that more realistic animations can happen and it's making it quicker to churn out lengthy animations because you don't need to draw every single frame. Once the characters and the set are modelled, key framing makes 3D animation a quick and effective animation style. 3D animation software also allows for effective camera angles and lighting effects that would be more challenging in 2D traditional animation.
Computer Generated Imagery is being used a lot more often in modern film. It is used in live action films and fully animated features.
With 2D, everything is drawn out individually, but if an arm goes behind the character, you don't need to draw the arm. However with 3D, you need to be aware of every body part and its positioning even when they are obscured behind the figure.
2D is obviously drawn on every frame and therefore takes a long time to sketch out, draw and colour each frame and you need to make sure each image is consistent and that the character doesnt change it's appearance between frames. This can be a challenge as tiny differences between frames arent noticeable straight away but become apparent over time while watching the animation through. 3D doesn't have this issue as the character will stay consistent between frames as you are just manipulating a modelled character.
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