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                 * {margin: 0; padding: 0;}
            html, body {
                overflow: hidden;
            }
            
          
!
            
              (() => {
    window.addEventListener('load', () => {
        // variables
        let width = window.innerWidth;
        let height = window.innerHeight;
        let targetDOM = document.getElementById('webgl');

        window.addEventListener('mousemove', (event) => {
            let w = window.innerWidth;
            let h = window.innerHeight;
            let x = event.clientX * 2.0 - w; //原点をスクリーンの中心にしている
            let y = event.clientY * 2.0 - h; //原点をスクリーンの中心にしている
            let length = Math.sqrt(x * x + y * y); //大きさ
            x /= length; //単位化する
            y /= length; //単位化する
           box.rotation.z= Math.atan2(x,y);
        }, false);

        // three.js class
        let scene;
        let camera;
        let controls;
        let renderer;
        let geometry;
        let material;
        let box;
        let directional;
        let ambient;

        // parameter
        let CAMERA_PARAMETER = {
            fovy: 60,
            aspect: width / height,
            near: 0.1,
            far: 10.0,
            x: 0.0,
            y: 0.0,
            z: 5.0,
            lookAt: new THREE.Vector3(0.0, 0.0, 0.0)
        };
        let RENDERER_PARAMETER = {
            clearColor: 0x333333,
            width: width,
            height: height
        };
        // material parameter
        let MATERIAL_PARAMETER = {
            color: 0x66B6FF,
            specular: 0xffffff
        };

        // initialize scene
        scene = new THREE.Scene();

        // initialize camera
        camera = new THREE.PerspectiveCamera(
            CAMERA_PARAMETER.fovy,
            CAMERA_PARAMETER.aspect,
            CAMERA_PARAMETER.near,
            CAMERA_PARAMETER.far
        );
        camera.position.x = CAMERA_PARAMETER.x;
        camera.position.y = CAMERA_PARAMETER.y;
        camera.position.z = CAMERA_PARAMETER.z;
        camera.lookAt(CAMERA_PARAMETER.lookAt);

        // initialize renderer
        renderer = new THREE.WebGLRenderer();
        renderer.setClearColor(new THREE.Color(RENDERER_PARAMETER.clearColor));
        renderer.setSize(RENDERER_PARAMETER.width, RENDERER_PARAMETER.height);
        targetDOM.appendChild(renderer.domElement);

        // initialize geometry
        geometry = new THREE.CylinderGeometry(0.5, 0.05,2.5, 5.0);
        material = new THREE.MeshPhongMaterial(MATERIAL_PARAMETER);
        box = new THREE.Mesh(geometry, material);
        scene.add(box);

        // initialize light
        directional = new THREE.DirectionalLight(0xffffff);
        directional.position.set(1.0, 1.0, 1.0);
        ambient = new THREE.AmbientLight(0xffffff, 0.2);
        scene.add(directional);
        scene.add(ambient);

        // rendering
        render();

        function render() {
            renderer.render(scene, camera);
            requestAnimationFrame(render); 
        }

       
    }, false);
})();
            
          
!
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