怎么样THREE.Sprite改变支点？

Question

我想将旋转变换原点设置为精灵的左，而不是居中，朝向相机时保持角度为水平。

      // 2d
      var texture = new THREE.Texture(canvas)
      texture.needsUpdate = true
      var material = new THREE.SpriteMaterial({ 
        map: texture, 
        transparent: true,
        useScreenCoordinates: false,
      })
      var actualSize = 10 / size.h
      var w = size.w / size.h * actualSize
      var h = actualSize
      var mesh = new THREE.Sprite(material)
      mesh.scale.set(w, h, 1)