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From a certain perspective, its almost like visual effects supervisor Stephane Ceretti was destined to work on theAnt-Manfranchise.

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Take, for example, the villain ofAnt-Man and the Wasp, Ghost, played by Hannah John-Kamen.

While moving, she leaves after-images of where she was that look, well, ghostly.

Ceretti says his background in quantum mechanics helped him come up with that approach.

But how to pull such a thing off?

Ceretti says there was no single method for it.

Its a mixture of things, he says.

But in other instances, especially action sequences, it was too hard to pull off the old-fashioned way.

That was when it was time to spelunk the Uncanny Valley.

Wed add a full 3-D model of Ghost that we had to do, Ceretti recalls.

We had two different models.

We could do pretty much anything we wanted to do.

How much can you actually do during a sequence?

As big of a lift as Ghosts effects were, Ceretti says they werent the biggest of the film.

One thing that was harder was, predictably, the Quantum Realm.

We figured out that those were still images and this is a very dynamic world, he says.

We shot in Atlanta, most of it, he says.

Some of it in San Francisco, but most of it in Atlanta.

But it is Atlanta.

It just goes to show that you never know whats going to become a headache in this business.