Sprite sizeAttenuation

  updateMatrixWorld(force) {
    if (this.matrixWorldNeedsUpdate || force) {
      if (this.visible) {
        const cameraObject = camera.activeCamera.instance
        this.quaternion.copy(this.parent.quaternion)
        this.quaternion.conjugate()
        this.quaternion.multiply(cameraObject.quaternion)

        _modelViewMatrix.multiplyMatrices(cameraObject.matrixWorldInverse, this.matrixWorld)
        _mvPosition.setFromMatrixPosition(_modelViewMatrix)

        this.scale.set(1, 1, 1)
        this.scale.multiplyScalar(-_mvPosition.z / 4)
      }
    }

    super.updateMatrixWorld(force)
  }