What is a CONTROLLER file? A CONTROLLER file is an animator controller used by Unity Technologies Unity, a game development application. It defines a state machine that connects animation clips, such as walk, run, or jump, and controls how a character or GameObject moves between these states during gameplay. Unity uses CONTROLLER files to help manage and organize animations for smooth motion.

More Information A state machine is similar to a flowchart, where each state represents an action, and the rules (called transitions) determine when and how the system switches from one action to another. For example, a character might switch from Idle to Run when the player presses a movement button, and back to Idle when the player stops moving. Game developers and animation designers create and edit CONTROLLER files with the Unity Editor. Using the Animator window, they set up states, transitions, and parameters, such as triggers, booleans, and floats, that guide how animations change.