W3cubDocs

/DOM

VRPose.linearVelocity

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

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

In other words, the current velocity at which the sensor is moving along the x, y, and z axes.

Syntax

var myLinearVelocity = VRPose.linearVelocity;

Value

A Float32Array, or null if the VR sensor is not able to provide linear velocity 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 velocity values for use in rendering
  // curFramePose is a VRPose object
  var curFramePose = frameData.pose;
  var linVel = curFramePose.linearVelocity;
  var lvx = linVel[0];
  var lvy = linVel[1];
  var lvz = linVel[2];

  // render the scene
  ...

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

Specifications

Specification Status Comment
WebVR 1.1
The definition of 'linearVelocity' in that specification.
Draft Initial definition

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
Basic support No 15 55
55
Windows support was enabled in Firefox 55.
63
macOS support was enabled in Firefox 63.
No ? ?
Mobile
Android webview Chrome for Android Edge Mobile Firefox for Android Opera for Android iOS Safari Samsung Internet
Basic support No 56
Disabled
56
Disabled
Only works in an experimental version of Chrome. (Other builds won't return any devices when Navigator.getVRDisplays() is invoked.)
Daydream View supported in Chrome 56.
Google Cardboard supported in Chrome 57.
Disabled From version 56: this feature is behind the WebVR preference. To change preferences in Chrome, visit chrome://flags.
? ? ? ? 6.0

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/VRPose/linearVelocity