几何模型的创建

球体

var sphereGeometry = new THREE.SphereGeometry(4, 20, 20);
var sphereMaterial = new THREE.MeshLambertMaterial({
    color: 0x7777ff
});
var sphere = new THREE.Mesh(sphereGeometry, sphereMaterial);
scene.add(sphere);

正方体

var cube = new THREE.Mesh(new THREE.CubeGeometry(1, 2, 3),
        new THREE.MeshBasicMaterial({
            color: 0xff0000
        })
);
scene.add(cube);

平面

var shadow = new THREE.PlaneGeometry(30, 50);
var ma = new THREE.MeshLambertMaterial({
    map: new THREE.TextureLoader().load("assets/img/shadow.png"),
    transparent: true,
});

backgroundPlant = new THREE.Mesh(shadow, ma);
scene.add(backgroundPlant);