How to create a size comparison video?

[Noah999]

Hello all, I'm new here.

Can someone please advice me on how to make a size comparizon video? Is it possible with After Effects?

I'm talking about a video that compares the sizes of largest buildings for example. I have seen these kind of videos on youtube but not sure if I'm allowed to post links here as I'm new. 

If someone can give me a link to a tutorial, it's much appriciated 

[Peru Bob]

You should be able to post a link.  If not, use plain text for the link.

[Noah999]

Thanks for the reply Bob. I did add two examples 🙂

[Noah999]

Here are two example of what I'm talking about. The second one could be made using flash I guess?

The first one I have no idea! 😕

https://www.youtube.com/watch?v=i93Z7zljQ7I

https://twitter.com/businessinsider/status/986285660452433920?lang=en

[Martin_Ritter]

Both videos are doable in AE pretty well.

For the first one, you have to create spinning globes and add a texture to them, and additional some effects like Saber.

https://www.youtube.com/watch?v=Rmp0AzSTRyE

I watched the second one only for a couple of seconds, but it looked like basic scale and rotation animation. For better handling, learn how to parent layers.

https://helpx.adobe.com/after-effects/how-to/animating-with-parenting.html

*Martin

[Noah999]

Thanks for the reply Martin. However, I wonder how I can compare the sizes of objects. For that maybe I have to check the size ratio of two different objects and change the parameters in AE accordingly? Or is there an easier way?

[Martin_Ritter]

If you want to compare a mile to a kilometer, for example, you say 1px = 1 Meter. Therefore, a mile is 1600px and a kilometer is 1000px. You can set a base and say, 1 mile is 1.6 of a kilometer. This can be transformed into 160% scale, if both object had the same scale initial. 

You can also set up a slider with the value of 1.6 and use expressions to drive the object size or scale, accordingly to the factor you set up on the slider. So, a mile is the size of a kilometer multyplied with it's individual scale factor of 1.6.

The sun has the size of earth, multiplied with it's individual scale factor of 109. That's the math.

I would set up relative scales (object size is base * factor). Later it's easier to zoom everything or make it fit into the frame. You just have to alter the base, instead if of every object.

*Martin

[Noah999]

Thanks for the reply Martin. This is really helpful (y)