【发布时间】：2018-01-08 15:18:27
【问题描述】：
我正在尝试为我的场景在三个.js 中使用地球设置图像背景，但不幸的是，当我这样做时，我的场景的主要对象也变成了黑色（与背景颜色相同。
我用的方法：
renderer = new THREE.WebGLRenderer({ antialias: false, alpha:true });
这使默认背景透明。然后我在 CSS 部分添加了图像背景。
我的整个场景脚本如下所示：
var container, stats;
var camera, scene, renderer;
var group;
var mouseX = 0, mouseY = 0;
var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;
init();
animate();
function init() {
container = document.getElementById( 'container' );
camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 1, 2000 );
//closer
camera.position.z = 500;
scene = new THREE.Scene();
group = new THREE.Group();
scene.add( group );
// earth
var loader = new THREE.TextureLoader();
loader.load( 'textures/mapnew1.jpg', function ( texture ) {
var geometry = new THREE.SphereGeometry( 180, 32, 32 );
var material = new THREE.MeshBasicMaterial( { map: texture, overdraw: 0.5 } );
var mesh = new THREE.Mesh( geometry, material );
group.add( mesh );
} );
// shadow
var canvas = document.createElement( 'canvas' );
canvas.width = 128;
canvas.height = 128;
var context = canvas.getContext( '2d' );
var gradient = context.createRadialGradient(
canvas.width / 2,
canvas.height / 2,
0,
canvas.width / 2,
canvas.height / 2,
canvas.width / 2
);
gradient.addColorStop( 0.1, '#000000' );
gradient.addColorStop( 1, '#000000' );
context.fillStyle = gradient;
context.fillRect( 0, 0, canvas.width, canvas.height );
var texture = new THREE.CanvasTexture( canvas );
var geometry = new THREE.PlaneBufferGeometry( 300, 300, 3, 3 );
var material = new THREE.MeshBasicMaterial( { map: texture, overdraw: 0.5 } );
var mesh = new THREE.Mesh( geometry, material );
mesh.position.y = - 200;
mesh.rotation.x = - Math.PI / 2;
group.add( mesh );
renderer = new THREE.CanvasRenderer();
renderer.setPixelRatio( window.devicePixelRatio );
renderer = new THREE.WebGLRenderer({ antialias: false, alpha:true });
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.setClearColor(0x000000, 0);
container.appendChild( renderer.domElement );
stats = new Stats();
container.appendChild( stats.dom );
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
//
window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize() {
windowHalfX = window.innerWidth / 2;
windowHalfY = window.innerHeight / 2;
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function onDocumentMouseMove( event ) {
mouseX = ( event.clientX - windowHalfX );
mouseY = ( event.clientY - windowHalfY );
}
//
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
function render() {
camera.position.x += ( mouseX - camera.position.x ) * 0.08;
camera.position.y += ( - mouseY - camera.position.y ) * 0.08;
camera.lookAt( scene.position );
group.rotation.y -= 0.003;
renderer.render( scene, camera );
}
</script>
这是我的 CSS：
body {
color: #ffffff;
font-family:'Futura';
font-size:20px;
text-align: center;
background-image: url(textures/starfield.png);
background-color: black;
margin: 0px;
overflow: hidden;
}
您有什么想法可以解决它并使地球仪可见吗？
非常感谢！
【问题讨论】：
-
你能详细说明一下吗？实际问题是什么？你在屏幕上看到了什么？另外，考虑用你的脚本、HTML 和 CSS 创建一个 plunker(plnkr.co)，这样我们就可以在同一个页面上。
-
这里是你的代码：plnkr.co/edit/i9gcDMuVAGQ5CqbVDlES?p=preview 它在所有可用版本的三个中都有一些错误
标签： javascript css three.js