What is VFX?
VFX is the part of a film that was not in front of the camera. It covers the invisible work, removing a logo, cleaning a reflection, extending a set beyond the edge of the stage, painting out a rig, and the visible work, from a product exploding into its ingredients to a city built from nothing. The craft includes compositing, where separately shot elements are combined into one frame; 3D, where objects and environments are built and rendered; simulation, for liquids, smoke and cloth; and tracking, which lets any of these move with the camera as if they were there on the day.
In commercial work the invisible side is the larger one. Most VFX shots in a brand film are never noticed, which is the point.
Why it matters
Why VFX matters
VFX extends what a production can show without extending what it has to build or shoot. A location can be cleaned of modern signage, a studio set can become a landscape, a product can be shown from inside, and a shot that would have been dangerous, expensive or impossible can be made safely in post. For beauty and product work it is also where the perfection lives: the dust, the fingerprints and the reflection of the crew are removed frame by frame.
It also fixes the day. A boom in frame, a continuity error, a cloud that moved: VFX is where the difference between what was planned and what was captured gets closed, which is why every finishing budget carries a line for it whether or not the film has visible effects.
In practice
How VFX works in practice
- 01
VFX starts before the shoot. A VFX supervisor reads the boards, flags the shots that will need work, and plans how they should be captured: clean plates without the talent, reference spheres for lighting, tracking markers on a green screen, a locked camera where a composite is coming. Shooting for VFX is a discipline, and footage captured without the plan is far more expensive to fix.
- 02
In post the shots are tracked, the elements are built or extracted, and the compositor assembles each frame, matching color, grain, focus and motion blur so the added material belongs to the plate. Reviews happen in rounds, and finished shots are returned to the editor's timeline and conformed into the master. Invisible work is checked by someone who does not know what was changed.
Watch out
What people get wrong about VFX
Assuming it can fix anything. VFX can do remarkable things to well-shot footage and very little to badly shot footage; a soft, overexposed plate with no reference is a shot that gets replaced rather than repaired. Plan for the effect on the day. The other mistake is budgeting it as a flat line. Effects are priced per shot and per complexity, and a client who adds one more shot to the list in the last week has added a cost nobody quoted.
