timelossMaterialswitch.js

const Scene = require('Scene');
const Animation = require('Animation');
const R = require('Reactive');
const TouchGestures = require('TouchGestures')
const Time = require('Time');
const Materials = require('Materials');
const Patches = require('Patches');
var materialOpacity = 0.3;
var material1 = Materials.get('material1');
var material2 = Materials.get('material2');


const face = Scene.root.find('faceMesh0');

TouchGestures.onTap(face).subscribe(function (gesture) {

    if(face.materialIdentifier === material1.identifier) {
      face.material = material1;
    } else {
      face.material = material2;
    }
  
  });
  var timeout = Time.setTimeout(function () {

    var driver = Animation.timeDriver({durationMilliseconds: 400 });
    var sampler = Animation.samplers.linear(materialOpacity, 0);
    material1.opacity = Animation.animate(driver, sampler);
    driver.start();

  }, 2500);