“Enter The Void” is the story of a teen who dies in Tokyo and then watches over his sister from “the other side”.  Given the subject matter, some manner of representing our world as viewed from the other side, along with various spectral phenomena and the ability to float freely through the environment, representing some unique challenges for VFX house ‘FX’.

Niquet: For the soul’s travel from one location to another, a BUF supervisor oversaw the shooting of the different streets and apartments. Then the editor back in Paris assembled them, but there was a pretty serious problem with the realism and continuity of the geography. We modeled all of the rooms and we placed them so we could achieve continuity via camera movement. We then added crowds and the cars in 3D to bring the city to life. This section represents 20 minutes of the film. For reasons related to the rhythm of the edit, the speed of these flyovers was multiplied by three during the course of production. There are lots and lots of little details that only cinephiles watching a DVD will notice.

via fxguide – vfx knowledge – Enter the Void made by fx.