更改背景

let scene = new THREE.Scene()
scene.background = new THREE.TextureLoader().load(image);
scene.background = new THREE.Color(color)

更改对象材质

// Create 1 material
var material = new THREE.MeshPhongMaterial();

let buildingObjs = [];
for (var i = 0; i < 2000; i++) {
    var geometry = new THREE.BoxGeometry( 1, 1, 1 );
    // Use that same material on 2000 meshes
    var building = new THREE.Mesh( geometry, material );
    buildingObjs.push(building);
}

buildingObjs[500].material.color.setHex( 0x333333 );

更改对象纹理

var material = new THREE.MeshBasicMaterial();
var geometry = new THREE.BoxGeometry( 1, 1, 1 );
var cube = new THREE.Mesh( geometry, material );
scene.add( cube );

var loader = new THREE.TextureLoader();
loader.load('https://s3-us-west-2.amazonaws.com/s.cdpn.io/259155/THREE_gates.jpg', function(tex) {
  cube.material.map = tex;
});