我开发了一个简单的three.js渲染立方体的应用程序。我创建了三个文件：index.html, viewer_style.css and viewer.js.
内容为index.html如下：
<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8>
<title>My first three.js app</title>
<link rel='stylesheet' type='text/css' href='viewer_style.css'>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="js/three.js"></script>
<script src="js/controls/OrbitControls.js"></script>
<script src="js/renderers/Projector.js"></script>
</head>
<body>
<script src="viewer.js"></script>
</body>
</html>
以及内容viewer.js如下：
// SCENE
var scene = new THREE.Scene();
// CAMERA
var frustumHeight;
var aspect = window.innerWidth / window.innerHeight;
var camera = new THREE.OrthographicCamera(- frustumHeight * aspect / 2, frustumHeight * aspect / 2, frustumHeight / 2, - frustumHeight / 2, 1, 2000 );
camera.position.x = 0;
camera.position.y = 0;
camera.position.z = 100;
// CUBE
var geometry = new THREE.BoxGeometry( 1, 1, 1 );
var material = new THREE.MeshPhongMaterial({color: 0xbaf5e8, flatShading: true});
var cube = new THREE.Mesh( geometry, material );
cube.receiveShadow = true;
scene.add(cube);
// BOUNDING BOX
var helper_bbox = new THREE.BoxHelper(cube);
helper_bbox.update();
scene.add(helper_bbox);
// AXES
var helper_axes = new THREE.AxisHelper();
scene.add(helper_axes);
// FIT ALL:
var bbox_radius = helper_bbox.geometry.boundingSphere.radius;
if(aspect < 1){
frustumHeight = 2 * bbox_radius;
}
else{
frustumHeight = 2 * bbox_radius / aspect;
}
camera.left = - frustumHeight * aspect / 2;
camera.right = frustumHeight * aspect / 2;
camera.top = frustumHeight / 2;
camera.bottom = - frustumHeight / 2;
camera.updateProjectionMatrix();
// RENDERER
var renderer = new THREE.WebGLRenderer({alpha: true});
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.shadowMap.enabled = true;
renderer.shadowMap.type = THREE.PCFShadowMap;
// LIGHTS
var ambientLight = new THREE.AmbientLight(0x101010, 1.0);
scene.add(ambientLight);
directionalLight = new THREE.DirectionalLight(0xffffff, 1.0);
directionalLight.position.set(1.0, 1.0, 1.0).normalize();
scene.add(directionalLight);
directionalLight_2 = new THREE.DirectionalLight(0xffffff, 1.0);
directionalLight_2.position.set(-1.0, -1.0, 1.0).normalize();
scene.add(directionalLight_2);
// CONTROLS
document.body.appendChild(renderer.domElement);
var controls = new THREE.OrbitControls(camera);
window.addEventListener( 'resize', onWindowResize, false );
function animate(){
requestAnimationFrame(animate);
renderer.render(scene, camera);
}
function onWindowResize(){
var aspect = window.innerWidth / window.innerHeight;
camera.left = - frustumHeight * aspect / 2;
camera.right = frustumHeight * aspect / 2;
camera.top = frustumHeight / 2;
camera.bottom = - frustumHeight / 2;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
camera.lookAt(scene.position);
}
animate();
我打算使用立方体边界球体的半径将立方体以一定的边距适合场景。它似乎工作正常，如下图所示：
但是，我改变了相机位置viewer.js至以下内容：
camera.position.x = 100;
camera.position.y = 100;
camera.position.z = 100;
在这种情况下，我得到这样的信息：
在这种情况下，立方体不适合屏幕。我认为这是因为我在错误的参考系中测量边界球体的半径。但是，我一直无法找到解决这个问题的方法。
有谁知道我做错了什么？我使用的方法正确吗？提前致谢。
如果您更改，您的代码是正确的aspect < 1 to aspect > 1，按照建议。这是您的代码的 jsfiddle 演示了这一点：https://jsfiddle.net/holgerl/kk5h39qa/