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光照阴影计算.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;
      }
    </style>
  </head>
  <body>
    <script src="./three.js/three.js"></script>
    <script src="./three.js/OrbitControls.js"></script>
    <script>
      var scene = new THREE.Scene();
      var geometry = new THREE.BoxGeometry(40, 100, 40);
      var material = new THREE.MeshLambertMaterial({
        color: 0x0000ff,
      });
      var mesh = new THREE.Mesh(geometry, material);
      //   mesh.position.set(0, 0, 0);
      scene.add(mesh);

      // 设置产生投影的网格模型
      mesh.castShadow = true;

      //创建一个平面几何体作为投影面
      var planeGeometry = new THREE.PlaneGeometry(500, 400);
      var planeMaterial = new THREE.MeshLambertMaterial({
        color: 0x999999,
      });
      // 平面网格模型作为投影面
      var planeMesh = new THREE.Mesh(planeGeometry, planeMaterial);
      scene.add(planeMesh); //网格模型添加到场景中
      planeMesh.rotateX(-Math.PI / 2); //旋转网格模型
      planeMesh.position.y = -50; //设置网格模型y坐标
      // 设置接收阴影的投影面
      planeMesh.receiveShadow = true;

      // 方向光
      var directionalLight = new THREE.DirectionalLight(0xffffff, 1);
      // 设置光源位置
      directionalLight.position.set(60, 100, 40);
      directionalLight.castShadow = true;
      scene.add(directionalLight);
      // 设置用于计算阴影的光源对象
      // 设置计算阴影的区域，最好刚好紧密包围在对象周围
      // 计算阴影的区域过大：模糊  过小：看不到或显示不完整
      directionalLight.shadow.camera.near = 0.5;
      directionalLight.shadow.camera.far = 300;
      directionalLight.shadow.camera.left = -50;
      directionalLight.shadow.camera.right = 50;
      directionalLight.shadow.camera.top = 200;
      directionalLight.shadow.camera.bottom = -100;
      // 设置mapSize属性可以使阴影更清晰，不那么模糊
      //   directionalLight.shadow.mapSize.set(1024, 1024);
      console.log(directionalLight.shadow.camera);
      var ambientLight = new THREE.AmbientLight("#333");
      scene.add(ambientLight);
      // 4,创建正交相机
      var width = window.innerWidth;
      var height = window.innerHeight;
      var k = width / height;
      var s = 200;
      //   var camera = new THREE.OrthographicCamera(-s * k, s * k, s, -s, 1, 1000);
      var camera = new THREE.PerspectiveCamera(45, width / height, 1, 2000);
      camera.position.set(400, 200, 300);
      camera.lookAt(scene.position);
      // 添加坐标轴
      var axis_helper = new THREE.AxesHelper(500);
      scene.add(axis_helper);
      // 5,创建渲染器对象
      var renderer = new THREE.WebGLRenderer();
      renderer.shadowMap.enabled = true;
      renderer.setSize(width, height);
      document.body.appendChild(renderer.domElement);
      function render() {
        renderer.render(scene, camera);
      }
      render();
      // 添加鼠标控制对象
      var controls = new THREE.OrbitControls(camera, renderer.domElement);
      controls.addEventListener("change", render);
    </script>
  </body>
</html>