XRInputSource.gripSpace

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The read-only XRInputSource property gripSpace returns an XRSpace whose native origin tracks the pose used to render virtual objects so they appear to be held in (or part of) the user's hand. For example, if a user were holding a virtual straight rod, the native origin of this XRSpace would be located at the approximate center of mass of the user's fist.

Syntax

var xrSpace = xrInputSource.gripSpace;

Value

An XRSpace object representing the position and orientation of the input device in virtual space, suitable for rendering an image of the device into the scene. gripSpace is null if the input source is inherently untrackable. For example, only inputs whose targetRayMode is tracked-pointer provide a gripSpace.

Imagine that the controller is shaped like a straight rod, held in the user's fist. The native origin of the grip space is located at the centroid—the center of mass—of the user's fist, tracking the position of the user's hand.

The coordinate system for the left hand's grip space.
A diagram showing how the grip space indicates the local coordinate system for the player's hand relative to the world.
The coordinate system for the right hand's grip space.
A diagram showing how the grip space indicates the local coordinate system for the player's hand relative to the world.

As shown in the diagram above, the coordinate system is oriented as follows:

  • The x-axis is perpendicular to the palm of the user's hand, with the direction extending outward from the back of the hand being +X if the controller is in the user's right hand or -X if the controller is in the left hand.
  • The z-axis along the length of the rod, parallel to the user's palm and along the length of their grip. +Z is in the direction of the user's thumb, and -Z is in the opposite direction.
  • The y-axis is implied by the relationship between the other two axes; as is always the case, it's the cross product of the other two axes (lying 90° away from both the X and Z axes).

Examples

In tis example, taken from the frame rendering callback, the gripSpace is used to render a mesh that represents the position and orieintation of the controller in the virtual environment.

for (let source in xrSession.inputSources) {
  if (source.gripSpace) {
    let gripPose = frame.getPose(source.gripSpace, xrRefSpace);

    if (gripPose) {
      myDrawMeshUsingTransform(controllerMesh, gripPose.transform.matrix);
    }
  }
}

For each input source which has a value for gripSpace, this loop obtains the XRPose representing the position and orientation that are described by gripSpace. If a valid pose is returned, a method myDrawMeshUsingTransform() is called to  draw the controller's mesh transformed using the grip pose's transform matrix.

Specifications

Specification Status Comment
WebXR Device API
The definition of 'XRInputSource.gripSpace' in that specification.
Working Draft Initial definition.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
gripSpaceChrome Full support 79Edge Full support 79Firefox No support NoIE No support NoOpera No support NoSafari No support NoWebView Android No support NoChrome Android Full support 79Firefox Android No support NoOpera Android No support NoSafari iOS No support NoSamsung Internet Android Full support 11.2

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