How to make a melting effect transition between two different levels/environments

Development Cinematics & Media
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1

I am trying to create a short film, and I am making two environments for it. My main character is supposed to snap his fingers, and would create a sort of melting transition effect that would change the environment to a new landscape.

here are some examples of what I am looking for:

Sakura Rabbit (though this was using Unity): https://youtu.be/63-4VAMylV8?si=5Udiine1hJN0M2Kt

Ayoub Attache: https://youtu.be/6cg9uMzHXDk?si=I2jblMEvmd9GDe4h

I know Data Layers exist but I have no clue how to implement this the way its shown in the aforementioned youtube videos

Any tips would help! thank you!

2

It’s something along these lines

Not particularly straightforward.

3

It’s very close to what I’m looking for. But I wish they went more into detail.
Thanks though