Projecting video onto 3D geometry or buildings with spatial accuracy — geometrically mapped to match every surface contour. Creates volumetric illusions in-camera or in post.
You project video content onto three-dimensional objects or architecture, and the software calculates the geometric distortion so that the projection appears correct from any angle — that's projection mapping. On set, you need precise calibration: camera position, projector position, the exact geometry of the object. Then the software maps the video content onto the surface, correcting keystone distortion and perspective distortion in real-time. The result is a seamless 3D illusion, as if the object itself is glowing or transforming.
In practice, you distinguish between two workflows: On-Set Mapping for live visualization and as a visual reference for actors and camera — for example, when a facade is digitally animated during a shoot, or an actor performs against a physical object that morphs in real-time. Here, you use specialized software like MadMapper, Resolume, or Disguise to control and fine-tune the projection during the shoot. The second method is Post-Production Mapping: you film the physical location or object, and in the edit, the VFX department maps the digital content into the shot, tracked and perspective-correct — significantly more complex, as tracking and geometry capture must be precise, but more flexible in post-production.
Practical tip: When mapping on set, you need stable projector positions and constant lighting in the studio or hall — ambient light destroys the effect immediately. The resolution of your projectors must match the planned image resolution and surface detail; cheap mapping on a rough brick wall looks pixelated. For camera movement, your tracking accuracy is crucial — if the projection drifts even by a few pixels, the effect looks cheap. In the edit, mapping works perfectly for static or minimally moving cameras, where you can match the projection to the movement. Also, pay attention to the surface color of the object; white or neutral gray surfaces are ideal, dark objects absorb projector brightness.
The advantage over classic VFX: Mapping creates real, reflection-capable lights on the scene, which drastically simplifies integration and lighting for further effects. Cinema examples use mapping for mobile phone displays, illuminated architecture in dystopian settings, or abstract transformations of stage elements. It's a hybrid technique that combines on-set efficiency and post-production control — but requires precise planning and calibrated hardware.