精灵模型Sprite

const textureLoader = new THREE.TextureLoader();
const spriteBg = textureLoader.load("./textures/sprite.png");
const spriteMaterial = new THREE.SpriteMaterial({
    map: spriteBg,
    side: THREE.DoubleSide,
    transparent: true,
})
const sprite = new THREE.Sprite(spriteMaterial);
scene.add(sprite);