如何从threeJS导出场景中的图像

var renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);

var camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 1, 1000);
camera.position.set(0, 0, 10);
camera.lookAt(scene.position);

renderer.render(scene, camera);

var canvas = document.createElement('canvas');
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
canvas.getContext('2d').drawImage(renderer.domElement, 0, 0);

var image = canvas.toDataURL('image/png');