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Daily Creative Coding

元「30 min. Processing」。毎日、Creative Codingします。

【Three.js】球で構成されたボール

See the Pen [2017/03/21][Three.js]sphere ball by aadebdeb (@aadebdeb) on CodePen.

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>[2017/03/21] sphere ball</title>
  <style>
    body {
      margin: 0;
      overflow: hidden;
    }
  </style>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/stats.js/r16/Stats.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/dat-gui/0.6.3/dat.gui.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/84/three.min.js"></script>
  <script>

    window.onload = function() {
      init();
      render();
    };
    window.onresize = onResize;
    window.onmousemove = onMouseMove;

    var camera, scene, renderer;
    var stats;
    var controller;
    var mouseX, mouseY;
    var ambientLight, spotLight, axisHelper, spotLightHelper, camera;

    function init() {

      mouseX = 0;
      mouseY = 0;

      initGui();
      initStats();

      initScene();
      initCamera();
      initRenderer();

    }

    function initStats() {
      stats = new Stats();
      stats.setMode(0);
      stats.domElement.style.position = 'absolute';
      stats.domElement.style.left = '0px';
      stats.domElement.style.top = '0px';
      document.body.appendChild(stats.domElement);
    }

    function initGui() {
      controller = new function() {
        this.ambientLightColor = '#eeeeee';
        this.spotLightColor = '#ffffff';
        this.isAxisHelperVisible = true;
        this.isSpotLightHelperVisible = true;
      };

      gui = new dat.GUI();
      gui.addColor(controller, 'ambientLightColor').onChange(function(e) {
        ambientLight.color = new THREE.Color(e);
      });
      gui.addColor(controller, 'spotLightColor').onChange(function(e) {
        spotLight.color = new THREE.Color(e);
      });
      gui.add(controller, 'isAxisHelperVisible').onChange(function(e) {
        axisHelper.visible = e;
      });
      gui.add(controller, 'isSpotLightHelperVisible').onChange(function(e) {
        spotLightHelper.visible = e;
      });
    }

    function initRenderer() {
      renderer = new THREE.WebGLRenderer();
      renderer.setClearColor(new THREE.Color(0x000000));
      renderer.setSize(window.innerWidth, window.innerHeight);
      document.body.appendChild(renderer.domElement);
      renderer.domElement.addEventListener('mousemove', onMouseMove);
    }


    function initCamera() {
      camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1500);
      camera.position.set(0, 0, 500);
      camera.lookAt(scene.position);
    }

    function initScene() {
      scene = new THREE.Scene();

      axisHelper = new THREE.AxisHelper(300);
      axisHelper.visible = controller.isAxisHelperVIsible;
      scene.add(axisHelper);

      for (var i = 0; i < 1000; i++) {
        var sphere = new THREE.Mesh(
          new THREE.SphereGeometry(5, 5, 5),
          new THREE.MeshPhongMaterial(0xffffff)
        );
        sphere.radius = getRandom(180, 220);
        sphere.tilt = getRandom(-Math.PI / 2, Math.PI / 2);
        sphere.angle = Math.random() * Math.PI * 2;
        sphere.angleSpeed = getRandom(Math.PI / 256, Math.PI / 128);
        scene.add(sphere);
      }

      ambientLight = new THREE.AmbientLight(new THREE.Color(controller.ambientLightColor));
      scene.add(ambientLight);

      spotLight = new THREE.SpotLight(new THREE.Color(controller.spotLightColor));
      spotLight.position.set(200, 200, 200);
      spotLight.angle = Math.PI / 12;
      spotLight.target.position.set(0, 0, 0);
      scene.add(spotLight);

      spotLightHelper = new THREE.SpotLightHelper(spotLight);
      spotLightHelper.visible = controller.isSpotLightHelperVisible;
      scene.add(spotLightHelper);
    }

    function getRandom(min, max) {
      return Math.random() * (max - min) + min;
    }

    function setSpherePosition(sphere) {
      sphere.position.x = sphere.radius * Math.cos(sphere.angle) * Math.cos(sphere.tilt);
      sphere.position.y = sphere.radius * Math.sin(sphere.tilt);
      sphere.position.z = sphere.radius * Math.sin(sphere.angle) * Math.cos(sphere.tilt);
    }

    function render() {
      scene.traverse(function(obj) {
        if (obj instanceof THREE.Mesh) {
          obj.angle += obj.angleSpeed;
          setSpherePosition(obj);
        }
      });
      stats.update();
      renderer.render(scene, camera);
      requestAnimationFrame(render);
    }

    function onResize() {
      camera.aspect = window.innerWidth / window.innerHeight;
      camera.updateProjectionMatrix();
      renderer.setSize(window.innerWidth, window.innerHeight);
    }

    function onMouseMove(e) {
      mouseX = e.offsetX;
      mouseY = e.offsetY;
      updateCamera();
    }

    function updateCamera() {
      if (camera != null) {
        camera.position.x = map(mouseX, 0, renderer.domElement.width, -1000, 1000);
        camera.position.y = map(mouseY, 0, renderer.domElement.height, -1000, 1000);
        camera.lookAt(scene.position);
      }
    }

    function map(v, min1, max1, min2, max2) {
      return (v / (max1 - min1)) * (max2 - min2) + min2;
    }

  </script>
</head>
<body>
</body>
</html>
f:id:aa_debdeb:20170320110244p:plain