VRPose.linearAcceleration

The linearAcceleration read-only property of the VRPose interface returns an array representing the linear acceleration vector of the VRDisplay at the current VRPose.timestamp, in meters per second per second.

In other words, the current acceleration of the sensor, along the x, y, and z axes.

Syntax

var myLinearAcceleration = VRPose.linearAcceleration;

Value

A Float32Array, or null if the VR sensor is not able to provide linear acceleration data.

Examples

// rendering loop for a VR scene
function drawVRScene() {
  // WebVR: Request the next frame of the animation
  vrSceneFrame = vrDisplay.requestAnimationFrame(drawVRScene);

  // Populate frameData with the data of the next frame to display
  vrDisplay.getFrameData(frameData);

  // Retrieve the linear acceleration values for use in rendering
  // curFramePose is a VRPose object
  var curFramePose = frameData.pose;
  var linAcc = curFramePose.linearAcceleration;
  var lax = linAcc[0];
  var lay = linAcc[1];
  var laz = linAcc[2];

  // render the scene
  ...

  // WebVR: submit the rendered frame to the VR display
  vrDisplay.submitFrame();
}

Specifications

Browser compatibility

See also

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