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Unlocking the Magic: A Comprehensive Guide to In-Camera VFX visualisation

Unlocking the Magic: A Comprehensive Guide to In-Camera VFX

Explore essential techniques for stunning in-camera VFX!
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Image source: In-Camera VFX in Unreal Engine | Unreal Engine 5.6 Documentation | Epic Developer Community

In-Camera VFX Unleashed

Image source: How In-Camera VFX is Changing the Game in Filmmaking?

In-Camera VFX Unleashed

Image source: In-Camera Effects - HowToFilmSchool.com

In-camera VFX (also called ICVFX or in-camera visual effects) is a filmmaking technique where visual effects are captured directly in the camera during the shoot, rather than being added later in post-production. The most common modern implementation uses LED volumes (massive curved screens) displaying real-time 3D environments.

How it works (modern LED volume method)

ComponentRole
LED wall/volumeDisplays CGI backgrounds in real-time around actors 1, 2
Real-time rendererEngines like Unreal Engine generate the virtual world instantly 3, 2
Camera trackingLive tracking knows the camera’s position/orientation 2
Off-axis projectionRenders the background from the correct perspective for each camera angle 2

The result: actors and physical props are filmed with the virtual background already visible, creating seamless integration with real reflections, lighting, and depth of field. 2, 4

Key advantages over traditional green screen

Traditional green screenIn-camera VFX
Background added in post-productionBackground captured live on set 5, 4
Actors stare at blank green wallActors see the actual environment 2
Reflections/shadows must be fakedReal reflections from LED walls 6
Heavy compositing work laterLess compositing in post 7, 8
Non-visual pipeline (VFX after shooting)Non-linear pipeline: VFX begins in pre-production 7, 8

Classic (older) in-camera effects

The term also includes traditional optical/physical tricks captured without digital rendering:

  • Forced perspective (miniatures appear giant) 6, 9
  • Matte paintings 10
  • Double exposure 11
  • Split diopters 11
  • Lens flares/filters 10, 11

Famous examples

  • The Mandalorian (Disney+) pioneered LED volume ICVFX at scale 1
  • Justice League, 1917, Dune used virtual production 1

This technique fundamentally shifts the VFX workflow: instead of simulations happening after filming, they’re done before filming using game-engine technology, enabling directors to see near-final results during production. 8, 12

References