<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.5.1/gsap.min.js" integrity="sha512-IQLehpLoVS4fNzl7IfH8Iowfm5+RiMGtHykgZJl9AWMgqx0AmJ6cRWcB+GaGVtIsnC4voMfm8f2vwtY+6oPjpQ==" crossorigin="anonymous"></script>

<div class="loading" id="js-loader"><div class="loader"></div></div>

<div class="wrapper">
    
<canvas id="c"></canvas>

</div>

body,
html {
  margin: 0;
  padding: 0;
  background: #25252B;
}
* {
  touch-action: manipulation;
}
*,
*:before,
*:after {
  box-sizing: border-box;
}
body {
  position: relative;
  width: 100%;
  height: 100vh;
}
.wrapper {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
#c {
  position: absolute;
  top: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.loading {
  position: fixed;
  z-index: 50;
  width: 100%;
  height: 100%;
  top: 0; left: 0;
  background: #f1f1f1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.loader{
  -webkit-perspective: 120px;
  -moz-perspective: 120px;
  -ms-perspective: 120px;
  perspective: 120px;
  width: 100px;
  height: 100px;
}

.loader:before{
  content: "";
  position: absolute;
  left: 25px;
  top: 25px;
  width: 50px;
  height: 50px;
  background-color: #9bffaf;
  animation: flip 1s infinite;
}

@keyframes flip {
  0% {
    transform: rotate(0);
  }

  50% {
    transform: rotateY(180deg);
  }

  100% {
    transform: rotateY(180deg)  rotateX(180deg);
  }
}

/*https://tympanus.net/codrops/2019/10/14/how-to-create-an-interactive-3d-character-with-three-js/*/
import * as THREE from "https://cdn.jsdelivr.net/npm/three@0.121.1/build/three.module.js";
import { GLTFLoader } from "https://cdn.jsdelivr.net/npm/three@0.121.1/examples/jsm/loaders/GLTFLoader.js";

(function () {
  let scene,
    renderer,
    camera,
    model,
    neck,
    waist,
    possibleAnims,
    mixer,
    idle,
    clock = new THREE.Clock(),
    currentlyAnimating = false,
    raycaster = new THREE.Raycaster(),
    loaderAnim = document.getElementById("js-loader");

  init();

  function init() {
    const MODEL_PATH =
      "https://s3-us-west-2.amazonaws.com/s.cdpn.io/1376484/stacy_lightweight.glb";

    const canvas = document.querySelector("#c");
    const backgroundColor = 0xf1f1f1;

    scene = new THREE.Scene();
    scene.background = new THREE.Color(backgroundColor);
    scene.fog = new THREE.Fog(backgroundColor, 60, 100);

    renderer = new THREE.WebGLRenderer({ canvas, antialias: true });
    renderer.shadowMap.enabled = true;
    renderer.setPixelRatio(window.devicePixelRatio);
    document.body.appendChild(renderer.domElement);

    camera = new THREE.PerspectiveCamera(
      50,
      window.innerWidth / window.innerHeight,
      0.1,
      1000
    );
    camera.position.set(0, -3, 30);

    let stacy_txt = new THREE.TextureLoader().load(
      "https://s3-us-west-2.amazonaws.com/s.cdpn.io/1376484/stacy.jpg"
    );
    stacy_txt.flipY = false;
    const stacy_mtl = new THREE.MeshPhongMaterial({
      color: 0xffffff,
      map: stacy_txt,
      skinning: true
    });

    let loader = new GLTFLoader();

    loader.load(
      MODEL_PATH,
      function (gltf) {
        model = gltf.scene;
        let fileAnimations = gltf.animations;

        model.traverse((o) => {
          if (o.isMesh) {
            o.castShadow = true;
            o.receiveShadow = true;
            o.material = stacy_mtl;
          }
          if (o.isBone && o.name === "mixamorigNeck") {
            neck = o;
          }
          if (o.isBone && o.name === "mixamorigSpine") {
            waist = o;
          }
        });
        model.scale.set(7, 7, 7);
        model.position.y = -11;

        scene.add(model);
        loaderAnim.remove();

        mixer = new THREE.AnimationMixer(model);
        let idleAnim = THREE.AnimationClip.findByName(fileAnimations, "idle");
        idleAnim.tracks.splice(3, 3);
        idleAnim.tracks.splice(9, 3);
        idle = mixer.clipAction(idleAnim);
        idle.play();
      },
      undefined,
      function (error) {
        console.error(error);
      }
    );

    let hemiLight = new THREE.HemisphereLight(0xffffff, 0xffffff, 0.61);
    hemiLight.position.set(0, 50, 0);
    scene.add(hemiLight);

    let d = 8.25;
    let dirLight = new THREE.DirectionalLight(0xffffff, 0.54);
    dirLight.position.set(-8, 12, 8);
    dirLight.castShadow = true;
    dirLight.shadow.mapSize = new THREE.Vector2(1024, 1024);
    dirLight.shadow.camera.near = 0.1;
    dirLight.shadow.camera.far = 1500;
    dirLight.shadow.camera.left = d * -1;
    dirLight.shadow.camera.right = d;
    dirLight.shadow.camera.top = d;
    dirLight.shadow.camera.bottom = d * -1;
    scene.add(dirLight);

    let floorGeo = new THREE.PlaneGeometry(5000, 5000, 1, 1);
    let floorMat = new THREE.MeshPhongMaterial({
      color: 0xeeeeee,
      shininess: 0
    });
    let floor = new THREE.Mesh(floorGeo, floorMat);
    floor.rotation.x = -0.5 * Math.PI;
    floor.receiveShadow = true;
    floor.position.y = -11;
    scene.add(floor);

    let geometry = new THREE.SphereGeometry(8, 32, 32);
    let material = new THREE.MeshBasicMaterial({ color: 0x9bffaf }); // 0xf2ce2e
    let sphere = new THREE.Mesh(geometry, material);
    sphere.position.z = -15;
    sphere.position.y = -2.5;
    sphere.position.x = -0.25;
    scene.add(sphere);
  }

  function animate() {
    if (mixer) {
      mixer.update(clock.getDelta());
    }

    if (resizeRendererToDisplaySize(renderer)) {
      const canvas = renderer.domElement;
      camera.aspect = canvas.clientWidth / canvas.clientHeight;
      camera.updateProjectionMatrix();
    }

    renderer.render(scene, camera);
    requestAnimationFrame(animate);
  }
  animate();

  function resizeRendererToDisplaySize(renderer) {
    const canvas = renderer.domElement;
    let width = window.innerWidth;
    let height = window.innerHeight;
    let canvasPixelWidth = canvas.width / window.devicePixelRatio;
    let canvasPixelHeight = canvas.height / window.devicePixelRatio;

    const needResize =
      canvasPixelWidth !== width || canvasPixelHeight !== height;
    if (needResize) {
      renderer.setSize(width, height, false);
    }
    return needResize;
  }
  document.addEventListener("mousemove", function (e) {
    var mousecoords = getMousePos(e);
    if (neck && waist) {
      moveJoint(mousecoords, neck, 50);
      moveJoint(mousecoords, waist, 30);
    }
  });

  function getMousePos(e) {
    return { x: e.clientX, y: e.clientY };
  }
  function moveJoint(mouse, joint, degreeLimit) {
    let degrees = getMouseDegrees(mouse.x, mouse.y, degreeLimit);
    joint.rotation.y = THREE.Math.degToRad(degrees.x);
    joint.rotation.x = THREE.Math.degToRad(degrees.y);
  }
  function getMouseDegrees(x, y, degreeLimit) {
    let dx = 0,
      dy = 0,
      xdiff,
      xPercentage,
      ydiff,
      yPercentage;

    let w = { x: window.innerWidth, y: window.innerHeight };

    // Left (Rotates neck left between 0 and -degreeLimit)

    // 1. If cursor is in the left half of screen
    if (x <= w.x / 2) {
      // 2. Get the difference between middle of screen and cursor position
      xdiff = w.x / 2 - x;
      // 3. Find the percentage of that difference (percentage toward edge of screen)
      xPercentage = (xdiff / (w.x / 2)) * 100;
      // 4. Convert that to a percentage of the maximum rotation we allow for the neck
      dx = ((degreeLimit * xPercentage) / 100) * -1;
    }
    // Right (Rotates neck right between 0 and degreeLimit)
    if (x >= w.x / 2) {
      xdiff = x - w.x / 2;
      xPercentage = (xdiff / (w.x / 2)) * 100;
      dx = (degreeLimit * xPercentage) / 100;
    }
    // Up (Rotates neck up between 0 and -degreeLimit)
    if (y <= w.y / 2) {
      ydiff = w.y / 2 - y;
      yPercentage = (ydiff / (w.y / 2)) * 100;
      // Note that I cut degreeLimit in half when she looks up
      dy = ((degreeLimit * 0.5 * yPercentage) / 100) * -1;
    }

    // Down (Rotates neck down between 0 and degreeLimit)
    if (y >= w.y / 2) {
      ydiff = y - w.y / 2;
      yPercentage = (ydiff / (w.y / 2)) * 100;
      dy = (degreeLimit * yPercentage) / 100;
    }
    return { x: dx, y: dy };
  }
})(); // Don't add anything below this line