examples/example13.html



<!DOCTYPE html>
<html>
 <head> 
  <title>Example 13 - Directional light</title> 
  <style>
    body{
      margin: 0;
      overflow: hidden;
    }

    #stats {  /* Align stats top-left */
      position: absolute;
      left: 0px;
      top: 0px;
    }
  </style> 
  </head>
  <body>
  <!-- JavaScript libraries -->
  <script src="http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
  <script src="http://cdnjs.cloudflare.com/ajax/libs/three.js/r67/three.min.js"></script>
  <script src="http://cdnjs.cloudflare.com/ajax/libs/stats.js/r11/Stats.min.js"></script>
  <script src="http://cdnjs.cloudflare.com/ajax/libs/dat-gui/0.5/dat.gui.min.js"></script>
  <script src="assets/libs/TrackballControls.js"></script>
  <!-- Javascript code that runs our Three.js examples --> 
  <script>
    // once everything is loaded, we run our Three.js stuff.
    $(function () {

      var stats = initStats();

      // create a scene, that will hold all our elements such as objects, cameras and lights.
      var scene = new THREE.Scene();

      // create a camera, which defines where we're looking at.
      var camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1000);

      // create trackball controls
      var trackballControls = new THREE.TrackballControls(camera);

      // create a render and set the size
      var renderer = new THREE.WebGLRenderer();

      renderer.setClearColor(new THREE.Color(0xEEEEEE, 1.0));
      renderer.setSize(window.innerWidth, window.innerHeight);
      renderer.shadowMapEnabled = true;

      // create the ground plane
      var planeGeometry = new THREE.PlaneGeometry(600, 200, 20, 20);
      var planeMaterial = new THREE.MeshLambertMaterial({color: 0xffffff});
      var plane = new THREE.Mesh(planeGeometry, planeMaterial);
      plane.receiveShadow = true;

      // rotate and position the plane
      plane.rotation.x = -0.5 * Math.PI;
      plane.position.x = 15
      plane.position.y = -5
      plane.position.z = 0

      // add the plane to the scene
      scene.add(plane);

      // create a cube
      var cubeGeometry = new THREE.CubeGeometry(4, 4, 4);
      var cubeMaterial = new THREE.MeshLambertMaterial({color: 0xff3333});
      var cube = new THREE.Mesh(cubeGeometry, cubeMaterial);
      cube.castShadow = true;

      // position the cube
      cube.position.x = -4;
      cube.position.y = 3;
      cube.position.z = 0;

      // add the cube to the scene
      scene.add(cube);

      var sphereGeometry = new THREE.SphereGeometry(4, 20, 20);
      var sphereMaterial = new THREE.MeshLambertMaterial({color: 0x7777ff});
      var sphere = new THREE.Mesh(sphereGeometry, sphereMaterial);

      // position the sphere
      sphere.position.x = 20;
      sphere.position.y = 0;
      sphere.position.z = 2;
      sphere.castShadow = true;

      // add the sphere to the scene
      scene.add(sphere);

      // position and point the camera to the center of the scene
      camera.position.x = -35;
      camera.position.y = 30;
      camera.position.z = 25;
      camera.lookAt(new THREE.Vector3(10, 0, 0));

      // add subtle ambient lighting
      var ambiColor = "#1c1c1c";
      var ambientLight = new THREE.AmbientLight(ambiColor);
      scene.add(ambientLight);


      var target = new THREE.Object3D();
      target.position = new THREE.Vector3(5, 0, 0);


      var pointColor = "#ff5808";
      var directionalLight = new THREE.DirectionalLight(pointColor);
      directionalLight.position.set(-40, 60, -10);
      directionalLight.castShadow = true;
      directionalLight.shadowCameraNear = 2;
      directionalLight.shadowCameraFar = 50;
      directionalLight.shadowCameraLeft = -20;
      directionalLight.shadowCameraRight = 20;
      directionalLight.shadowCameraTop = 20;
      directionalLight.shadowCameraBottom = -20;

      directionalLight.intensity = 0.5;
      directionalLight.shadowMapHeight = 1024;
      directionalLight.shadowMapWidth = 1024;


      scene.add(directionalLight);


      // add a small sphere simulating the pointlight
      var sphereLight = new THREE.SphereGeometry(0.2);
      var sphereLightMaterial = new THREE.MeshBasicMaterial({color: 0xac6c25});
      var sphereLightMesh = new THREE.Mesh(sphereLight, sphereLightMaterial);
      sphereLightMesh.castShadow = true;

      sphereLightMesh.position = new THREE.Vector3(3, 20, 3);
      scene.add(sphereLightMesh);


      // add the output of the renderer to the html element
      $('body').append(renderer.domElement);

      // call the render function
      var step = 0;

      // used to determine the switch point for the light animation
      var invert = 1;
      var phase = 0;

      var controls = new function () {
        this.rotationSpeed = 0.03;
        this.bouncingSpeed = 0.03;
        this.ambientColor = ambiColor;
        this.pointColor = pointColor;
        this.intensity = 0.5;
        this.debug = false;
        this.castShadow = true;
        this.onlyShadow = false;
        this.target = "Plane";
      }

      var gui = new dat.GUI();
      gui.addColor(controls, 'ambientColor').onChange(function (e) {
          ambientLight.color = new THREE.Color(e);
      });

      gui.addColor(controls, 'pointColor').onChange(function (e) {
          directionalLight.color = new THREE.Color(e);
      });

      gui.add(controls, 'intensity', 0, 5).onChange(function (e) {
          directionalLight.intensity = e;
      });

      gui.add(controls, 'debug').onChange(function (e) {
          directionalLight.shadowCameraVisible = e;
      });

      gui.add(controls, 'castShadow').onChange(function (e) {
          directionalLight.castShadow = e;
      });

      gui.add(controls, 'onlyShadow').onChange(function (e) {
          directionalLight.onlyShadow = e;
      });

      // gui.add(controls, 'target', ['Plane', 'Sphere', 'Box']).onChange(function (e) {
      //   console.log(e);
      //   switch (e) {
      //     case "Plane":
      //       directionalLight.target = plane;
      //       break;
      //     case "Sphere":
      //       directionalLight.target = sphere;
      //       break;
      //     case "Box":
      //       directionalLight.target = cube;
      //       break;
      //   }
      // });


      render();

      function render() {
        stats.update();
        trackballControls.update();

        // rotate the cube around its axes
        cube.rotation.x += controls.rotationSpeed;
        cube.rotation.y += controls.rotationSpeed;
        cube.rotation.z += controls.rotationSpeed;

        // bounce the sphere up and down
        step += controls.bouncingSpeed;
        sphere.position.x = 20 + ( 10 * (Math.cos(step)));
        sphere.position.y = 2 + ( 10 * Math.abs(Math.sin(step)));

        sphereLightMesh.position.z = -8;
        sphereLightMesh.position.y = +(27 * (Math.sin(step / 3)));
        sphereLightMesh.position.x = 10 + (26 * (Math.cos(step / 3)));

        directionalLight.position = sphereLightMesh.position;

        // render using requestAnimationFrame
        requestAnimationFrame(render);

        renderer.render(scene, camera);
      }


      function initStats() {
        var stats = new Stats();
        stats.setMode(0); // 0: fps, 1: ms
        $('body').append(stats.domElement);
        return stats;
      }

    });
  </script>  
 </body>
</html>