threejs 精灵贴图是不是可以随着相机旋转

是的，three.js中的精灵贴图可以随着相机旋转。通过设置精灵对象的`billboard`属性为`true`，精灵将始终面向相机，并且无论相机如何旋转，精灵将保持面向相机。例如：

var spriteMap = new THREE.TextureLoader().load( 'textures/sprite.png' );
var spriteMaterial = new THREE.SpriteMaterial( { map: spriteMap, color: 0xffffff } );
var sprite = new THREE.Sprite( spriteMaterial );
sprite.position.set( 0, 0, 10 );
sprite.scale.set( 1, 1, 1 );
sprite.material.color.set(0xffffff);
sprite.material.opacity = 0.5;
sprite.material.transparent = true;
sprite.material.depthWrite = false;
sprite.material.depthTest = false;
sprite.material.blending = THREE.AdditiveBlending;
sprite.material.alphaTest = 0.5;
sprite.material.side = THREE.DoubleSide;
sprite.billboard = true;
scene.add( sprite );

在这个例子中，`sprite.billboard`的值被设置为`true`，这意味着精灵将始终面向相机。