Codepin

<script src="js/three.min.js"></script>
<script src="js/Projector.js"></script>
<script src="js/CanvasRenderer.js"></script>

        <script>
            var SCREEN_WIDTH = window.innerWidth,
            SCREEN_HEIGHT = window.innerHeight,
            mouseX = 0, mouseY = 0,
            windowHalfX = window.innerWidth / 2,
            windowHalfY = window.innerHeight / 2,
            camera, scene, renderer;
            init();
            animate();
            function init() {
                container = document.createElement('div');
                document.body.appendChild(container);
                camera = new THREE.PerspectiveCamera( 75, SCREEN_WIDTH / SCREEN_HEIGHT, 1, 10000 );
                camera.position.z = 1000;
                scene = new THREE.Scene();
                renderer = new THREE.CanvasRenderer();
                renderer.setPixelRatio( window.devicePixelRatio );
                renderer.setSize( SCREEN_WIDTH, SCREEN_HEIGHT );
                container.appendChild( renderer.domElement );
                var loader = new THREE.JSONLoader();
                loader.load( 'js/Neuron.json', );
                document.addEventListener( 'mousemove', onDocumentMouseMove, false );
                document.addEventListener( 'touchstart', onDocumentTouchStart, false );
                document.addEventListener( 'touchmove', onDocumentTouchMove, false );
                //
                window.addEventListener( 'resize', onWindowResize, false );
            }
            function onWindowResize() {
                windowHalfX = window.innerWidth / 2;
                windowHalfY = window.innerHeight / 2;
                camera.aspect = window.innerWidth / window.innerHeight;
                camera.updateProjectionMatrix();
                renderer.setSize( window.innerWidth, window.innerHeight );
            }
            //
            function onDocumentMouseMove(event) {
                mouseX = event.clientX - windowHalfX;
                mouseY = event.clientY - windowHalfY;
         }
            function onDocumentTouchStart( event ) {
                if ( event.touches.length > 1 ) {
                    event.preventDefault();
                    mouseX = event.touches[ 0 ].pageX - windowHalfX;
                    mouseY = event.touches[ 0 ].pageY - windowHalfY;
                }
            }
            function onDocumentTouchMove( event ) {
                if ( event.touches.length == 1 ) {
                    event.preventDefault();
                    mouseX = event.touches[ 0 ].pageX - windowHalfX;
                    mouseY = event.touches[ 0 ].pageY - windowHalfY;
                }
            }
            //
            function animate() {
                requestAnimationFrame( animate );
                render();
            }
            function render() {
                camera.position.x += ( mouseX - camera.position.x ) * .05;
                camera.position.y += ( - mouseY + 200 - camera.position.y ) * .05;
                camera.lookAt( scene.position );
                renderer.render( scene, camera );
            }
    </script>