Abstract: Aspects of the subject technology provide for system state management in a centralized rendering environment. A system may initialize a tree structure for a three-dimensional environment. The system renders the three-dimensional environment based at least in part on a traversal of the tree structure. The system identifies a request to change first or second visual states. The system can determine a first state update to the first visual state and a second state update to the second visual state and updates the tree structure by passing, by a first node, the first state update to a first child node and separately passing the second state update to a second child node. The system re-renders the three-dimensional environment based at least in part on a traversal of the updated tree structure.

Abstract: Various implementations disclosed herein include devices, systems, and methods that monitors for user presence to determine if a head mounted device (HMD) display should be active or inactive. For example, a process may obtain first sensor data from a first sensor on the HMD. The sensor may be configured to capture sensor data corresponding to an eye box region in front of at least one display of the HMD. Based on the sensor data, the process may detect a gaze of a user of the HMD and based on detecting the gaze, an initial user presence corresponding to a user wearing the HMD is determined. Based on determining the initial user presence, the process may activate the at least one display of the HMD by changing a state of the at least one display from an inactive state to an active state.

Abstract: Facilitating the fit of a head mounted device includes calculating a nominal interocular distance (IOD) using a nominal eye model. A device IOD is based on a distance between a first optical module and a second optical module of the headset. The device IOD is compared to the calculated nominal IOD. If a difference between the device IOD and the calculated nominal IOD satisfies a threshold, an adjustment process is initiated to modify the distance between the first optical module and the second optical module.

Abstract: Aspects of the subject technology provide for system state management in a centralized rendering environment. A system may initialize a tree structure for a three-dimensional environment. The system renders the three-dimensional environment based at least in part on a traversal of the tree structure. The system identifies a request to change first or second visual states. The system can determine a first state update to the first visual state and a second state update to the second visual state and updates the tree structure by passing, by a first node, the first state update to a first child node and separately passing the second state update to a second child node. The system re-renders the three-dimensional environment based at least in part on a traversal of the updated tree structure.