What is forced perspective? How does it apply to the filming of Frodo and Gandalf together on the cart in Lord of the Rings. Why does motion of the camera make this difficult? What is the solution?

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What is forced perspective? How does it apply to the filming of Frodo and Gandalf together on the cart in Lord of the Rings. Why does motion of the camera make this difficult? What is the solution?



Forced perspective is a technique that employs optical illusion to make an object appear farther away, closer, larger or smaller than it actually is. Using static camera, because hobbit - human height difference is 0.75:1, if frodo and gandalf in same scene, put frodo ⅓ distance away, in cart scene, frodo seating behind gandalf although it seems like they seat next to each other.
Motion camera makes it difficult because then the distance between two objects change. In Lord of the Rings they used moving dolly for the actor's chair/desk so that the distance is preserved even when the camera is moving

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