THREE Image Transition

index.html

<div id="three-container"></div>

<div id="instructions">
	click and drag to control the animation
</div>

script.js

window.onload = init;
console.ward = function() {}; // what warnings?

function init() {
  var root = new THREERoot({
    createCameraControls: !true,
    antialias: (window.devicePixelRatio === 1),
    fov: 80
  });

  root.renderer.setClearColor(0x000000, 0);
  root.renderer.setPixelRatio(window.devicePixelRatio || 1);
  root.camera.position.set(0, 0, 60);

  var width = 100;
  var height = 60;

  var slide = new Slide(width, height, 'out');
	var l1 = new THREE.ImageLoader();
	l1.setCrossOrigin('Anonymous');
  slide.setImage(l1.load('https://s3-us-west-2.amazonaws.com/s.cdpn.io/175711/winter.jpg'));
  root.scene.add(slide);

  var slide2 = new Slide(width, height, 'in');
  var l2 = new THREE.ImageLoader();
	l2.setCrossOrigin('Anonymous');
	slide2.setImage(l2.load('https://s3-us-west-2.amazonaws.com/s.cdpn.io/175711/spring.jpg'));
  root.scene.add(slide2);

  var tl = new TimelineMax({repeat:-1, repeatDelay:1.0, yoyo: true});

  tl.add(slide.transition(), 0);
  tl.add(slide2.transition(), 0);

  createTweenScrubber(tl);

  window.addEventListener('keyup', function(e) {
    if (e.keyCode === 80) {
      tl.paused(!tl.paused());
    }
  });
}

////////////////////
// CLASSES
////////////////////

function Slide(width, height, animationPhase) {
  var plane = new THREE.PlaneGeometry(width, height, width * 2, height * 2);

  THREE.BAS.Utils.separateFaces(plane);

  var geometry = new SlideGeometry(plane);

  geometry.bufferUVs();

  var aAnimation = geometry.createAttribute('aAnimation', 2);
  var aStartPosition = geometry.createAttribute('aStartPosition', 3);
  var aControl0 = geometry.createAttribute('aControl0', 3);
  var aControl1 = geometry.createAttribute('aControl1', 3);
  var aEndPosition = geometry.createAttribute('aEndPosition', 3);

  var i, i2, i3, i4, v;

  var minDuration = 0.8;
  var maxDuration = 1.2;
  var maxDelayX = 0.9;
  var maxDelayY = 0.125;
  var stretch = 0.11;

  this.totalDuration = maxDuration + maxDelayX + maxDelayY + stretch;

  var startPosition = new THREE.Vector3();
  var control0 = new THREE.Vector3();
  var control1 = new THREE.Vector3();
  var endPosition = new THREE.Vector3();

  var tempPoint = new THREE.Vector3();

  function getControlPoint0(centroid) {
    var signY = Math.sign(centroid.y);

    tempPoint.x = THREE.Math.randFloat(0.1, 0.3) * 50;
    tempPoint.y = signY * THREE.Math.randFloat(0.1, 0.3) * 70;
    tempPoint.z = THREE.Math.randFloatSpread(20);

    return tempPoint;
  }

  function getControlPoint1(centroid) {
    var signY = Math.sign(centroid.y);

    tempPoint.x = THREE.Math.randFloat(0.3, 0.6) * 50;
    tempPoint.y = -signY * THREE.Math.randFloat(0.3, 0.6) * 70;
    tempPoint.z = THREE.Math.randFloatSpread(20);

    return tempPoint;
  }

  for (i = 0, i2 = 0, i3 = 0, i4 = 0; i < geometry.faceCount; i++, i2 += 6, i3 += 9, i4 += 12) {
    var face = plane.faces[i];
    var centroid = THREE.BAS.Utils.computeCentroid(plane, face);

    // animation
    var duration = THREE.Math.randFloat(minDuration, maxDuration);
    var delayX = THREE.Math.mapLinear(centroid.x, -width * 0.5, width * 0.5, 0.0, maxDelayX);
    var delayY;

    if (animationPhase === 'in') {
      delayY = THREE.Math.mapLinear(Math.abs(centroid.y), 0, height * 0.5, 0.0, maxDelayY)
    }
    else {
      delayY = THREE.Math.mapLinear(Math.abs(centroid.y), 0, height * 0.5, maxDelayY, 0.0)
    }

    for (v = 0; v < 6; v += 2) {
      aAnimation.array[i2 + v]     = delayX + delayY + (Math.random() * stretch * duration);
      aAnimation.array[i2 + v + 1] = duration;
    }

    // positions

    endPosition.copy(centroid);
    startPosition.copy(centroid);

    if (animationPhase === 'in') {
      control0.copy(centroid).sub(getControlPoint0(centroid));
      control1.copy(centroid).sub(getControlPoint1(centroid));
    }
    else { // out
      control0.copy(centroid).add(getControlPoint0(centroid));
      control1.copy(centroid).add(getControlPoint1(centroid));
    }

    for (v = 0; v < 9; v += 3) {
      aStartPosition.array[i3 + v]     = startPosition.x;
      aStartPosition.array[i3 + v + 1] = startPosition.y;
      aStartPosition.array[i3 + v + 2] = startPosition.z;

      aControl0.array[i3 + v]     = control0.x;
      aControl0.array[i3 + v + 1] = control0.y;
      aControl0.array[i3 + v + 2] = control0.z;

      aControl1.array[i3 + v]     = control1.x;
      aControl1.array[i3 + v + 1] = control1.y;
      aControl1.array[i3 + v + 2] = control1.z;

      aEndPosition.array[i3 + v]     = endPosition.x;
      aEndPosition.array[i3 + v + 1] = endPosition.y;
      aEndPosition.array[i3 + v + 2] = endPosition.z;
    }
  }

  var material = new THREE.BAS.BasicAnimationMaterial(
    {
      shading: THREE.FlatShading,
      side: THREE.DoubleSide,
      uniforms: {
        uTime: {type: 'f', value: 0}
      },
      shaderFunctions: [
        THREE.BAS.ShaderChunk['cubic_bezier'],
        //THREE.BAS.ShaderChunk[(animationPhase === 'in' ? 'ease_out_cubic' : 'ease_in_cubic')],
        THREE.BAS.ShaderChunk['ease_in_out_cubic'],
        THREE.BAS.ShaderChunk['quaternion_rotation']
      ],
      shaderParameters: [
        'uniform float uTime;',
        'attribute vec2 aAnimation;',
        'attribute vec3 aStartPosition;',
        'attribute vec3 aControl0;',
        'attribute vec3 aControl1;',
        'attribute vec3 aEndPosition;',
      ],
      shaderVertexInit: [
        'float tDelay = aAnimation.x;',
        'float tDuration = aAnimation.y;',
        'float tTime = clamp(uTime - tDelay, 0.0, tDuration);',
        'float tProgress = ease(tTime, 0.0, 1.0, tDuration);'
        //'float tProgress = tTime / tDuration;'
      ],
      shaderTransformPosition: [
        (animationPhase === 'in' ? 'transformed *= tProgress;' : 'transformed *= 1.0 - tProgress;'),
        'transformed += cubicBezier(aStartPosition, aControl0, aControl1, aEndPosition, tProgress);'
      ]
    },
    {
      map: new THREE.Texture(),
    }
  );

  THREE.Mesh.call(this, geometry, material);

  this.frustumCulled = false;
}
Slide.prototype = Object.create(THREE.Mesh.prototype);
Slide.prototype.constructor = Slide;
Object.defineProperty(Slide.prototype, 'time', {
  get: function () {
    return this.material.uniforms['uTime'].value;
  },
  set: function (v) {
    this.material.uniforms['uTime'].value = v;
  }
});

Slide.prototype.setImage = function(image) {
  this.material.uniforms.map.value.image = image;
  this.material.uniforms.map.value.needsUpdate = true;
};

Slide.prototype.transition = function() {
  return TweenMax.fromTo(this, 3.0, {time:0.0}, {time:this.totalDuration, ease:Power0.easeInOut});
};


function SlideGeometry(model) {
  THREE.BAS.ModelBufferGeometry.call(this, model);
}
SlideGeometry.prototype = Object.create(THREE.BAS.ModelBufferGeometry.prototype);
SlideGeometry.prototype.constructor = SlideGeometry;
SlideGeometry.prototype.bufferPositions = function () {
  var positionBuffer = this.createAttribute('position', 3).array;

  for (var i = 0; i < this.faceCount; i++) {
    var face = this.modelGeometry.faces[i];
    var centroid = THREE.BAS.Utils.computeCentroid(this.modelGeometry, face);

    var a = this.modelGeometry.vertices[face.a];
    var b = this.modelGeometry.vertices[face.b];
    var c = this.modelGeometry.vertices[face.c];

    positionBuffer[face.a * 3]     = a.x - centroid.x;
    positionBuffer[face.a * 3 + 1] = a.y - centroid.y;
    positionBuffer[face.a * 3 + 2] = a.z - centroid.z;

    positionBuffer[face.b * 3]     = b.x - centroid.x;
    positionBuffer[face.b * 3 + 1] = b.y - centroid.y;
    positionBuffer[face.b * 3 + 2] = b.z - centroid.z;

    positionBuffer[face.c * 3]     = c.x - centroid.x;
    positionBuffer[face.c * 3 + 1] = c.y - centroid.y;
    positionBuffer[face.c * 3 + 2] = c.z - centroid.z;
  }
};


function THREERoot(params) {
  params = utils.extend({
    fov: 60,
    zNear: 10,
    zFar: 100000,

    createCameraControls: true
  }, params);

  this.renderer = new THREE.WebGLRenderer({
    antialias: params.antialias,
    alpha: true
  });
  this.renderer.setPixelRatio(Math.min(2, window.devicePixelRatio || 1));
  document.getElementById('three-container').appendChild(this.renderer.domElement);

  this.camera = new THREE.PerspectiveCamera(
    params.fov,
    window.innerWidth / window.innerHeight,
    params.zNear,
    params.zfar
  );

  this.scene = new THREE.Scene();

  if (params.createCameraControls) {
    this.controls = new THREE.OrbitControls(this.camera, this.renderer.domElement);
  }

  this.resize = this.resize.bind(this);
  this.tick = this.tick.bind(this);

  this.resize();
  this.tick();

  window.addEventListener('resize', this.resize, false);
}
THREERoot.prototype = {
  tick: function () {
    this.update();
    this.render();
    requestAnimationFrame(this.tick);
  },
  update: function () {
    this.controls && this.controls.update();
  },
  render: function () {
    this.renderer.render(this.scene, this.camera);
  },
  resize: function () {
    this.camera.aspect = window.innerWidth / window.innerHeight;
    this.camera.updateProjectionMatrix();

    this.renderer.setSize(window.innerWidth, window.innerHeight);
  }
};

////////////////////
// UTILS
////////////////////

var utils = {
  extend: function (dst, src) {
    for (var key in src) {
      dst[key] = src[key];
    }

    return dst;
  },
  randSign: function () {
    return Math.random() > 0.5 ? 1 : -1;
  },
  ease: function (ease, t, b, c, d) {
    return b + ease.getRatio(t / d) * c;
  },
  fibSpherePoint: (function () {
    var vec = {x: 0, y: 0, z: 0};
    var G = Math.PI * (3 - Math.sqrt(5));

    return function (i, n, radius) {
      var step = 2.0 / n;
      var r, phi;

      vec.y = i * step - 1 + (step * 0.5);
      r = Math.sqrt(1 - vec.y * vec.y);
      phi = i * G;
      vec.x = Math.cos(phi) * r;
      vec.z = Math.sin(phi) * r;

      radius = radius || 1;

      vec.x *= radius;
      vec.y *= radius;
      vec.z *= radius;

      return vec;
    }
  })(),
  spherePoint: (function () {
    return function (u, v) {
      u === undefined && (u = Math.random());
      v === undefined && (v = Math.random());

      var theta = 2 * Math.PI * u;
      var phi = Math.acos(2 * v - 1);

      var vec = {};
      vec.x = (Math.sin(phi) * Math.cos(theta));
      vec.y = (Math.sin(phi) * Math.sin(theta));
      vec.z = (Math.cos(phi));

      return vec;
    }
  })()
};

function createTweenScrubber(tween, seekSpeed) {
  seekSpeed = seekSpeed || 0.001;

  function stop() {
    TweenMax.to(tween, 1, {timeScale:0});
  }

  function resume() {
    TweenMax.to(tween, 1, {timeScale:1});
  }

  function seek(dx) {
    var progress = tween.progress();
    var p = THREE.Math.clamp((progress + (dx * seekSpeed)), 0, 1);

    tween.progress(p);
  }

  var _cx = 0;

  // desktop
  var mouseDown = false;
  document.body.style.cursor = 'pointer';

  window.addEventListener('mousedown', function(e) {
    mouseDown = true;
    document.body.style.cursor = 'ew-resize';
    _cx = e.clientX;
    stop();
  });
  window.addEventListener('mouseup', function(e) {
    mouseDown = false;
    document.body.style.cursor = 'pointer';
    resume();
  });
  window.addEventListener('mousemove', function(e) {
    if (mouseDown === true) {
      var cx = e.clientX;
      var dx = cx - _cx;
      _cx = cx;

      seek(dx);
    }
  });
  // mobile
  window.addEventListener('touchstart', function(e) {
    _cx = e.touches[0].clientX;
    stop();
    e.preventDefault();
  });
  window.addEventListener('touchend', function(e) {
    resume();
    e.preventDefault();
  });
  window.addEventListener('touchmove', function(e) {
    var cx = e.touches[0].clientX;
    var dx = cx - _cx;
    _cx = cx;

    seek(dx);
    e.preventDefault();
  });
}

scripts

<script src="//cdnjs.cloudflare.com/ajax/libs/three.js/r75/three.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/gsap/1.18.0/TweenMax.min.js"></script>
<script src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/175711/bas.js"></script>
<script src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/175711/OrbitControls-2.js"></script>

style.css

body {
	margin: 0;
	overflow: hidden;
}

canvas {
	background-image: radial-gradient(#666, #333);
}

#instructions {
	position: absolute;
	color: #fff;
	bottom: 0;
	padding-bottom: 6px;
	font-family: sans-serif;
	width: 100%;
	text-align: center;
	pointer-events: none;
}

three-image-transition.markdown

THREE Image Transition

Shader powered image transition

A Pen by Szenia Zadvornykh on CodePen.

License.

For people looking to change the image you must ensure your CORS permissions are correct for the images you want to use. If you are just testing on CodePen you need to ensure you are using images with open AllowedHeaders and an origin that includes cdpn.io

Here are some Docs about how you can do it with Amazon s3 Buckets
Look at Example 1
General info

With Amazon s3 buckets you will also need to add this to you bucket policy (replace [PATH OF YOUR BUCKET]):
{ "Version": "2008-10-17", "Statement": [ { "Sid": "AllowPublicRead", "Effect": "Allow", "Principal": { "AWS": "*" }, "Action": "s3:GetObject", "Resource": "arn:aws:s3:::[PATH OF YOUR BUCKET]/*" } ] }