具有三个 js 的透明背景

代码可以正常工作，但是我在使用 three. js 设置画布的透明背景时遇到了问题。我使用:

Background.renderer.setClearColor(0xffffff, 0);

但是后来背景变黑了，我怎么把它变成透明的呢？

密码:

   var camera, scene, renderer;
var mouseX = 0, mouseY = 0;
var p;


var windowHalfX = site.Width / 2;
var windowHalfY = site.Height / 2;


Background.camera = new THREE.PerspectiveCamera( 35, site.Width / site.Height, 1, 2000 );
Background.camera.position.z = 300;
//camera.position.y = 200;


// scene
Background.scene = new THREE.Scene();


// texture
var manager = new THREE.LoadingManager();
manager.onProgress = function ( item, loaded, total ) {
console.log('webgl, twice??');
//console.log( item, loaded, total );
};




// particles
var p_geom = new THREE.Geometry();
var p_material = new THREE.ParticleBasicMaterial({
color: 0xFFFFFF,
size: 1
});


// model
var loader = new THREE.OBJLoader( manager );
loader.load( site.base_url + '/assets/models/head.obj', function ( object ) {


object.traverse( function ( child ) {


if ( child instanceof THREE.Mesh ) {


// child.material.map = texture;


var scale = 6;


$(child.geometry.vertices).each(function() {
p_geom.vertices.push(new THREE.Vector3(this.x * scale, this.y * scale, this.z * scale));
})
}
});


Background.scene.add(p)
});


p = new THREE.ParticleSystem(
p_geom,
p_material
);


Background.renderer = new THREE.WebGLRenderer();
Background.renderer.setSize( site.Width, site.Height );
Background.renderer.setClearColor(0xffffff, 0);


$('.particlehead').append(Background.renderer.domElement);
$('#content').on('mousemove', onDocumentMouseMove);
site.window.on('resize', onWindowResize);


function onWindowResize() {
windowHalfX = site.Width / 2;
windowHalfY = site.Height / 2;
//console.log(windowHalfX);


Background.camera.aspect = site.Width / site.Height;
Background.camera.updateProjectionMatrix();


Background.renderer.setSize( site.Width, site.Height );
}


function onDocumentMouseMove( event ) {
mouseX = ( event.clientX - windowHalfX ) / 2;
mouseY = ( event.clientY - windowHalfY ) / 2;
//console.log(mouseX)
}


Background.animate = function() {


//console.log('animate2');
Background.ticker = TweenMax.ticker;
Background.ticker.addEventListener("tick", Background.animate);


render();
}


function render() {
Background.camera.position.x += ( (mouseX * .5) - Background.camera.position.x ) * .05;
Background.camera.position.y += ( -(mouseY * .5) - Background.camera.position.y ) * .05;


Background.camera.lookAt( Background.scene.position );


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


render();