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Is there a way to move objects from the camera while scaling them to look the same size? (lemmy.world)

submitted 3 days ago by [email protected] to c/[email protected]

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Is there any way to move an object directly toward or away from the camera while scaling it to preserve its apparent size, so it doesn't look like it's moving or scaling? I don't think this is very useful, but it could be good for condensing a distant landscape to be visible with realistic looking scales while not requiring a huge rendering distance.

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[–] [email protected] 1 points 2 days ago

Thanks for the detailed answer. As a person with vision, i'm familiar with this already but i didn't know any of the math or science behind it.

I mostly was curious to know if an addon existed to adjust an object's scale as you adjust its distance along an axis perpendicular to the camera (your view, not the camera object) to keep its visual angle the same. I don't have any need for a tool like this so i probably won't try to make said addon, but it's nice to know that the formulas for this already exist.

I think photos of people posing around monuments are good examples of this. You already mentioned the Eiffel Tower appearing to be as tall as a person from the right angle.

The Leaning Tower of Pisa is obviously much bigger than this bag, but the bag is positioned at an angle to make the tower look small enough to fit inside.