The dots give cameras facial landmarks to follow
Those small painted marks are tracking markers: high-contrast reference points that make it easier for cameras and software to follow an actor’s face as it moves. A camera can record a cheek, brow, or corner of the mouth changing shape, but subtle motion is hard to measure reliably across changing light, skin texture, and fast expressions. Distinct dots give the tracking system clearer targets.
As the actor speaks or reacts, the cameras capture how the marked points shift relative to one another. Software uses those movements to estimate facial motion, which animators can apply to a digital character’s face. The dots are not a set of buttons that directly control matching points on the character; they help record the performance that artists and software translate into the character’s design.
Why paint them on the actor?
The markers stay attached to the skin, so they move with the actor’s expressions rather than merely indicating where the face was at rest. Their placement can help capture changes around expressive areas such as the eyes and mouth. Depending on the production’s equipment and method, markers may be designed to stand out in ordinary or infrared camera footage.
This is one part of performance capture, the process of recording an actor’s movements for a digital performance. It lets filmmakers preserve details of a human performance—like a tightening smile or raised brow—even when the character on screen has a very different face. The dots are temporary tracking aids; the expression they help capture is what matters.
