boing.js

var Scene = require('Scene');
var FaceTracking = require('FaceTracking');

var faceSignalX = FaceTracking.face(0).cameraTransform.x.expSmooth(100);
var faceSignalX2 = FaceTracking.face(0).cameraTransform.x.expSmooth(80);

var faceSignalY = FaceTracking.face(0).cameraTransform.y.expSmooth(80);
var faceSignalY2 = FaceTracking.face(0).cameraTransform.y.expSmooth(90);


var scaleFactor = 4
;

// rotate X right and right spring base on head Y rotation
Scene.root.find("joint1").transform.rotationX = faceSignalY2.sub(faceSignalY).mul(scaleFactor);
Scene.root.find("joint2").transform.rotationX = faceSignalY2.sub(faceSignalY).mul(scaleFactor);
Scene.root.find("joint3").transform.rotationX = faceSignalY2.sub(faceSignalY).mul(scaleFactor);
Scene.root.find("joint4").transform.rotationX = faceSignalY2.sub(faceSignalY).mul(scaleFactor);
Scene.root.find("joint5").transform.rotationX = faceSignalY2.sub(faceSignalY).mul(scaleFactor);