如何将等距相机指向 THREE.js 中的立方体中心？

Question

我正在为一个练习题苦苦挣扎，也许你可以帮助我。我必须用 THREE.js 设置相机和立方体。立方体应保持其初始比例，并且相机应注视立方体的中心。我想我设法做了一个等距投影，但我不知道如何将相机指向中心。

这是我尝试过的：

<!DOCTYPE html>
 <html>

 <head>
<meta charset=utf-8>
<title>Cube</title>
<style>

</style>
</head>

<body>
<script src="js/three.min.js"></script>
<script>
        var scene = new THREE.Scene();
        var camera = new THREE.OrthographicCamera(-3,3,3,-3, 0, 100);


        var ambientLight = new THREE.AmbientLight(0x222222);
        scene.add(ambientLight);
        var light = new THREE.PointLight( 0xffffff );
        light.position.set(-10, 10, 10);
        scene.add(light);
        var renderer = new THREE.WebGLRenderer();
        renderer.setSize(800,800);

        document.body.appendChild(renderer.domElement);

        var geometry = new THREE.BoxGeometry(1,1,1);
        var cube = new THREE.Mesh(geometry, new THREE.MeshLambertMaterial( { color: 0x00ffff }));
        scene.add( cube );

  function render() { //this is to be used for animation later
  requestAnimationFrame(render);
        camera.position.x=1;
        camera.position.y=1;
        camera.position.z=1;

        camera.lookAt(new THREE.Vector3(0,0,0));
        renderer.render( scene, camera);

        }
 render();
</script>

Answer 1

这就是 lookAt 的用途。在你的例子中，立方体的位置等于它的中心，所以答案是：

camera.lookAt( cube.position );

http://jsfiddle.net/L0rdzbej/135/

如何将等距相机指向 THREE.js 中的立方体中心？

How to point isometric camera to the center of cube in THREE.js?

javascript

3d

geometry

three.js