How many degrees of freedom does a VR system have when it tracks both position and rotation?

A VR system has six degrees of freedom when it tracks both position and rotation.

Six degrees of freedom, commonly abbreviated 6DoF, combine three positional movements with three rotational movements. Position can change along the X, Y, and Z axes, while rotation includes pitch, yaw, and roll.

A 3DoF headset tracks rotational orientation but not the user’s movement through space. A 6DoF headset can detect a user leaning, stepping, or moving their head forward and backward, which makes virtual objects appear anchored more convincingly in the room.

Inside-out tracking systems use cameras on the headset to estimate movement relative to the surrounding environment. Earlier VR systems often relied on external sensors or base stations. The phrase describes tracked motion capability, not the number of physical controllers or the number of dimensions in the virtual world.