XRHand

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

The XRHand interface is pair iterator (an ordered map) with the key being the hand joints and the value being an XRJointSpace.

XRHand is returned by XRInputSource.hand.

Instance properties

size Read only Experimental: Returns 25, the size of the pair iterator.

The XRHand object is a pair iterator. It can directly be used in a for...of structure. for (const joint of myHand) is equivalent to for (const joint of myHand.entries()). However, it's not a map-like object, so you don't have the clear(), delete(), has(), and set() methods.

entries() Experimental: Returns an iterator with the hand joints/XRJointSpace pairs for each element. See Map.prototype.entries() for more details.
forEach() Experimental: Runs a provided function once per each hand joint/XRJointSpace pair. See Map.prototype.forEach() for more details.
get() Experimental: Returns a XRJointSpace for a given hand joint or undefined if no such hand joint key is in the map. See Map.prototype.get() for more details.
keys() Experimental: Returns an iterator with all the hand joint keys. See Map.prototype.keys() for more details.
values() Experimental: Returns an iterator with all the XRJointSpace values. See Map.prototype.values() for more details.

Hand joints

The XRHand object contains the following hand joints:

Hand

Hand joint	Index
wrist	0
thumb-metacarpal	1
thumb-phalanx-proximal	2
thumb-phalanx-distal	3
thumb-tip	4
index-finger-metacarpal	5
index-finger-phalanx-proximal	6
index-finger-phalanx-intermediate	7
index-finger-phalanx-distal	8
index-finger-tip	9
middle-finger-metacarpal	10
middle-finger-phalanx-proximal	11
middle-finger-phalanx-intermediate	12
middle-finger-phalanx-distal	13
middle-finger-tip	14
ring-finger-metacarpal	15
ring-finger-phalanx-proximal	16
ring-finger-phalanx-intermediate	17
ring-finger-phalanx-distal	18
ring-finger-tip	19
pinky-finger-metacarpal	20
pinky-finger-phalanx-proximal	21
pinky-finger-phalanx-intermediate	22
pinky-finger-phalanx-distal	23
pinky-finger-tip	24

Examples

Using `XRHand` objects

const wristJoint = inputSource.hand.get("wrist");
const indexFingerTipJoint = inputSource.hand.get("index-finger-tip");

for (const [joint, jointSpace] of inputSource.hand) {
  console.log(joint);
  console.log(jointSpace);
}