HMDVRDevice

The HMDVRDevice interface of the WebVR API represents a head mounted display, providing access to information about each eye, and allowing us to modify the current field of view.

Methods

HMDVRDevice.getEyeParameters()

Returns current parameters for the eye specified as its argument ("left" or "right") — such as field of view information — stored in a VREyeParameters object.

HMDVRDevice.setFieldOfView()

Sets the field of view for both eyes.

Properties

This interface doesn't define any properties of its own, but it does inherit the properties of its parent interface, VRDevice.

VRDevice.hardwareUnitId Read only

Returns the distinct hardware ID for the overall hardware unit that this VRDevice is a part of. All devices that are part of the same physical piece of hardware will have the same hardwareUnitId.

VRDevice.deviceId Read only

Returns the ID for this specific VRDevice. The ID shouldn’t change across browser restarts, allowing configuration data to be saved based on it.

VRDevice.deviceName Read only

A human-readable name to identify the VRDevice.

Examples

The following example, taken from the WebVR spec, finds the first available HMDVRDevice and its associated PositionSensorVRDevice, if it has one.

navigator.getVRDevices().then(function(devices) {
  for (var i = 0; i < devices.length; ++i) {
    if (devices[i] instanceof HMDVRDevice) {
      gHMD = devices[i];
      break;
    }
  }

  if (gHMD) {
    for (var i = 0; i < devices.length; ++i) {
      if (devices[i] instanceof PositionSensorVRDevice && devices[i].hardwareUnitId === gHMD.hardwareUnitId) {
        gPositionSensor = devices[i];
        break;
      }
    }
  }
});

Specifications

Specification	Status	Comment
WebVR The definition of 'HMDVRDevice' in that specification.	Editor's Draft	Initial definition

Browser compatibility

• [1] The support in Chrome is currently experimental. To find information on Chrome's WebVR implementation status including supporting builds, check out Bringing VR to Chrome by Brandon Jones.
• [2] The support for this feature is currently disabled by default in Firefox. To enable WebVR support in Firefox Nightly/Developer Edition, you can go to about:config and enable the dom.vr* prefs. A better option however is to install the WebVR Enabler Add-on, which does this for you and sets up other necessary parts of the environment.
• [3] The dom.vr* prefs are enabled by default at this point, in Nightly/Aurora editions.

See also

• WebVR API homepage.
• MozVr.com — demos, downloads, and other resources from the Mozilla VR team.