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three-js-demo
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关键帧动画.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      * {
        margin: 0;
        padding: 0;
      }
      button {
        position: absolute;
        bottom: 0;
        right: 0;
      }
    </style>
  </head>
  <body>
    <button>继续/暂停</button>
    <script src="./three.js/three.js"></script>
    <script src="./three.js/OrbitControls.js"></script>
    <script src="./three.js/stats.js"></script>
    <script src="./three.js/dat.gui.js"></script>
    <script>
      var scene = new THREE.Scene();

      var ball = new THREE.SphereGeometry(20);
      var ballMaterial = new THREE.MeshLambertMaterial({
        color: "#000",
        wireframe: true,
      });
      var ballMesh = new THREE.Mesh(ball, ballMaterial);

      var rectangle = new THREE.BoxGeometry(50, 10, 8);
      var rectangleMaterial = new THREE.MeshLambertMaterial({
        color: "#00f",
        wireframe: true,
      });
      var rectangleMesh = new THREE.Mesh(rectangle, rectangleMaterial);

      var group = new THREE.Group();
      rectangleMesh.name = "Box"; //网格模型1命名
      ballMesh.name = "Sphere";
      scene.add(group);
      group.add(ballMesh);
      group.add(rectangleMesh);

      var posTrack = new THREE.KeyframeTrack(
        "Box.position",
        [0, 10],
        [0, 0, 0, 300, 0, 0]
      );
      var colorTrack = new THREE.KeyframeTrack(
        "Box.material.color",
        [10, 20],
        [1, 0, 0, 1, 1, 0]
      );
      var scaleTrack = new THREE.KeyframeTrack(
        "Sphere.scale",
        [0, 20],
        [1, 1, 1, 3, 3, 3]
      );
      var clip = new THREE.AnimationClip("default", 20, [
        posTrack,
        colorTrack,
        scaleTrack,
      ]);
      var mixer = new THREE.AnimationMixer(group);
      var AnimationAction = mixer.clipAction(clip);
      AnimationAction.timeScale = 5;
      AnimationAction.play();

      var ambientLight = new THREE.AmbientLight("#fff");
      scene.add(ambientLight);

      var width = window.innerWidth;
      var height = window.innerHeight;
      var camera = new THREE.OrthographicCamera(
        width / -2,
        width / 2,
        height / 2,
        height / -2,
        0.1,
        1000
      );
      camera.position.set(200, 200, 200);
      camera.lookAt(scene.position);

      var renderer = new THREE.WebGLRenderer();
      renderer.setSize(width, height);
      renderer.setClearColor("#333");
      document.body.appendChild(renderer.domElement);

      var axes = new THREE.AxesHelper(500);
      scene.add(axes);

      var orbitControls = new THREE.OrbitControls(camera, renderer.domElement);

      var stats = new Stats();
      stats.domElement.style.position = "absolute";
      stats.domElement.style.left = "0px";
      stats.domElement.style.top = "0px";
      document.body.appendChild(stats.domElement);

      var datGUI = new dat.GUI();

      var Options = function () {
        this.rotationSpeed = 0.01;
      };
      var options = new Options();

      datGUI.add(options, "rotationSpeed", 0, 0.5);

      //创建一个时钟对象
      var clock = new THREE.Clock();

      function render() {
        // stats.begin();
        renderer.render(scene, camera);
        rectangleMesh.rotation.x += options.rotationSpeed;
        ballMesh.rotation.y += options.rotationSpeed;
        requestAnimationFrame(render);

        // stats.end();
        mixer.update(clock.getDelta());
      }
      render();
      window.onresize = function () {
        renderer.setSize(window.innerWidth, window.innerHeight);
        // 重置相机投影的相关参数
        camera.left = window.innerWidth / -2;
        camera.right = window.innerWidth / 2;
        camera.top = window.innerHeight / 2;
        camera.bottom = window.innerHeight / -2;
        // 渲染器执行render方法的时候会读取相机对象的投影矩阵属性projectionMatrix
        // 但是不会每渲染一帧，就通过相机的属性计算投影矩阵(节约计算资源)
        // 如果相机的一些属性发生了变化，需要执行updateProjectionMatrix ()方法更新相机的投影矩阵
        camera.updateProjectionMatrix();
      };
      var btn = document.querySelector("button");
      btn.addEventListener("click", () => {
        if (AnimationAction.paused) {
          AnimationAction.paused = false;
        } else {
          AnimationAction.paused = true;
        }
      });
    </script>
  </body>
</html>