playsomethingOnceandFadeaway.js

const Materials = require('Materials');
const Textures = require('Textures');
const Scene = require('Scene');
const TouchGestures = require('TouchGestures');
const Animation = require('Animation');
// Locate the plane in the Scene
const plane = Scene.root.find('plane0');
//animation has 5 frames and is imported into a material called "material0"
//Material0 is applied to plane0 in the scene
//tapGestures is enabled from the user-preferences menu
//animation sequence name is animationsSequence0
const timeDriverParameters = {

    // The duration of the driver
    durationMilliseconds: 3000,
  
    // The number of iterations before the driver stops
    loopCount: 1,
  
  
    mirror: true  
};
const animationSequence0 = Textures.get("animationSequence0");
const material = Materials.get('material0');

plane.material = material;

const timeDriver = Animation.timeDriver(timeDriverParameters);

const handSequenceFrameSampler = Animation.samplers.sequence(
		{ 
			samplers: [ 
				Animation.samplers.linear(0, 5),
				Animation.samplers.linear(5, 5),
				Animation.samplers.linear(5, 0),
				Animation.samplers.linear(0, 0)
			],
			knots: [ 0, 1, 5, 6, 7]
		});
const handSequenceFrameAnimation = Animation.animate(timeDriver, handSequenceFrameSampler);

animationSequence0.currentFrame = handSequenceFrameAnimation;

const handOpacitySampler = Animation.samplers.linear(1,-3);
const handOpacityAnimation = Animation.animate(timeDriver, handOpacitySampler).expSmooth(100);
material.opacity = handOpacityAnimation;


// Subscribe to tap gestures on the plane
TouchGestures.onTap(plane).subscribe(function (gesture) {

  // Switch materials depending on which one is currently applied to the plane
  if(plane.materialIdentifier === material.identifier) {
    timeDriver.start();
    plane.material = material;
  } else {
    plane.material.opacity = 100;
  }

});