threejs 引用额外的字体库

var loader = new THREE.FontLoader();
loader.load('字体库路径helvetiker_regular.typeface.json', function(font) {
    var mesh = new THREE.Mesh(new THREE.TextGeometry('Hello', {
        font: font,
        size: 1,
        height: 1
    }), material);
    scene.add(mesh);

    // render
    renderer.render(scene, camera);
});