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我有一个从THREEJS例子（https://threejs.org/examples/webgl_loader_fbx.html）中导入并显示threejs.json场景的场景。场面正常，我有一个网格，我的模型放在网格的顶部。如何将THREEJS中相机的焦点更改为现有物体？
当我拖动鼠标并缩放时，相机指向屏幕的中心。但是，该模型位于场景的底部，因此常常位于相机外部。
如何将相机的中心设置为我放置的模型？
我试着加入camera.lookAt(new THREE.Vector3(0, 0, 0))，但是对于相机的中心没有任何影响，不管我改变了什么值。
下面是我的代码：
<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - FBX loader</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<style>
body {
font-family: Monospace;
background-color: #000;
color: #fff;
margin: 0px;
overflow: hidden;
}
#info {
color: #fff;
position: absolute;
top: 10px;
width: 100%;
text-align: center;
z-index: 100;
display:block;
}
#info a, .button { color: #f00; font-weight: bold; text-decoration: underline; cursor: pointer }
</style>
</head>
<body>
<div id="info">
Test
</div>
<script src="js/three.js"></script>
<script src="js/controls/OrbitControls.js"></script>
<script src="js/loaders/FBXLoader.js"></script>
<script src="js/Detector.js"></script>
<script src="js/libs/stats.min.js"></script>
<script>
if (! Detector.webgl) Detector.addGetWebGLMessage();
var container, stats, controls;
var camera, scene, renderer;
var w = 1920;
var h = 1080;
var clock = new THREE.Clock();
var mixers = [];
init();
function init() {
container = document.createElement('div');
document.body.appendChild(container);
camera = new THREE.PerspectiveCamera(45, (window.innerWidth/window.innerHeight), 2, 2000);
scene = new THREE.Scene();
// grid
var gridHelper = new THREE.GridHelper(14, 28, 0x303030, 0x303030);
gridHelper.position.set(0, - 0.04, 0);
scene.add(gridHelper);
// stats
stats = new Stats();
container.appendChild(stats.dom);
// model
var manager = new THREE.LoadingManager();
manager.onProgress = function(item, loaded, total) {
console.log(item, loaded, total);
};
var onProgress = function(xhr) {
if (xhr.lengthComputable) {
var percentComplete = xhr.loaded/xhr.total * 100;
console.log(Math.round(percentComplete, 2) + '% downloaded');
}
};
var onError = function(xhr) {
};
// BEGIN Clara.io JSON loader code
var objectLoader = new THREE.ObjectLoader();
objectLoader.load("carport-scene.json", function (obj) {
scene.add(obj);
});
// END Clara.io JSON loader code
renderer = new THREE.WebGLRenderer();
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.setClearColor(0x0000ff);
container.appendChild(renderer.domElement);
// controls, camera
controls = new THREE.OrbitControls(camera, renderer.domElement);
controls.target.set(0, 12, 0);
camera.position.set(25, 0, 25);
//camera.lookAt(new THREE.Vector3(100, 100, 100));
controls.update();
window.addEventListener('resize', onWindowResize, false);
animate();
}
function onWindowResize() {
camera.aspect = window.innerWidth/window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
//
function animate() {
requestAnimationFrame(animate);
if (mixers.length > 0) {
for (var i = 0; i < mixers.length; i ++) {
mixers[ i ].update(clock.getDelta());
}
}
stats.update();
render();
}
function render() {
renderer.render(scene, camera);
}
</script>
</body>
</html>
我已经创建出这一问题的GIF： http://g.recordit.co/APLcyJKj01.gif
