Multiple synchronized projectors onto screens — creates immersive environments or extended backgrounds. Broadway standard, now digital on-set solution.
Multiple projectors cast synchronously onto one or more surfaces — this creates spatial depth and immersion without you having to cobble everything together in post-production. On set, this specifically means: you have real light, real reflections on your actors' faces, real motion parallax. This isn't green screen, it's real-time background.
The classic application comes from theater — stage designers have been linking multiple video projectors for decades to create seamless panoramas. In film, this was long a custom solution: expensive, complicated, only for large productions. Today, with networked 4K and 6K projectors and reliable sync systems, we also use this technique for medium budgets. The cameras are rolling, the projectors are frame-synchronous, and your talent is suddenly in a believable landscape — not in front of a screen, but right in the middle of it.
Practically, it works like this: you need a content management system that orchestrates multiple projectors — each receives its portion of the image, all start frame-accurately together. It's important that you calibrate your geometry beforehand. If you project two or four projectors onto a circular wall or a ceiling set, you need to adjust the overlap zones so that no double light is created and no black gaps appear. This is Keystone correction on a grand scale — your VFX supervisor and the lighting operator work closely together here.
The practical advantage over green screen lies in the interaction: actors see the environment, can react within it, their eyes focus correctly. The lighting technician needs less post-processing. Shadows fall correctly, color temperatures are right from the start. For traffic scenes, spaceship interiors, or dynamic chases, a multi-projection setup is often faster than traditional compositing — if the hardware is in place.
Disadvantage: system errors are visible. If a projector fails, you have a black hole in the middle of the scene. The acquisition of three to six professional high-performance projectors plus sync hardware is not cheap. And good content material — geometrically correct, color-calibrated — must exist beforehand.