How to read Z-Pos of Skeletal Hand?

  • You can kinda fake it using the size of the object. The attach to object tracking script does this inside it.


    I removed the attachment stuff so you're just left with the worldPos value which has a z value you can use. Should work with any object tracking really.


    // -----JS CODE-----

    // AttachToObjectTracking.js except the attachment part got yeeted and deleted
    // Version: 0.0.2
    // Event: Initialized
    // Description: get world pos from object tracking

    // @input Component.Camera perspectiveCamera
    // @input Component.ObjectTracking objectTracking
    // @input float baseDepthFactor = 250

    var screenTransform = script.objectTracking

    // Convert anchor space [-1 to 1] to screen space [0 to 1]
    function anchorSpaceToScreenSpace(point) {
      return new vec2(
        point.x * 0.5 + 0.5,
        -point.y * 0.5 + 0.5 // note that Y is flipped in screen space

    function onUpdate() {
      if (script.objectTracking.isTracking()) {
        var anchors = screenTransform.anchors
        var center = anchors.getCenter()
        var size = anchors.getSize()

        // Get the tracked object's position in camera screen space
        var screenPos = anchorSpaceToScreenSpace(center)

        // Estimate the depth by squaring the size of the tracked object
        var lenSquared = size.length + 1
        lenSquared = lenSquared * lenSquared
        lenSquared -= 1
        var depth = script.baseDepthFactor / lenSquared

        // Get the world position in the camera's view using our screen pos and estimated depth
        var worldPos = script.perspectiveCamera.screenSpaceToWorldSpace(

        // worldPos.z is the Z value

    var updateEvent = script.createEvent('UpdateEvent')
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  • Thanks Brandon - I will see if that works for me.

    Cheers eL

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