Axis in Qt 3D is an abstraction of analog one-dimensional input. A typical source of axis input is an analog stick of a gamepad. As the name implies, Axis only represents movement along a single axis, so a stick can be represented by two axes—one for vertical movement and one for horizontal movement. A pressure-sensitive button can be represented by a single axis. An axis input produces a float value ranging from −1 to 1, with zero corresponding to the neutral position.