This virtual set was then transferred to a computer-animation tool Blender, where artists painted on more stylistic 2D elements. Animators used these rough overlays to adjust and refine the 3D model.

Narrator: When the animation process for Netflix's "Klaus" began, it looked something like this. It eventually started looking like a pretty impressive 2D film.

What’s that mean? It means synthesizing a 3D scene from 2D images, in high quality and in real time, as the short animation shown above shows.