// 添加地面和天空盒
Viewer.prototype.changeSkyBox = function (skydir) {
  const that = this
  // 創(chuàng)建幾何模型 BoxGeometry('x軸', '軸', 'z軸')
  const geometry = new THREE.BoxGeometry(999, 999, 999)
  // 創(chuàng)建紋理貼圖  前后  上下  左右
  const texture0 = new THREE.TextureLoader().load((gAppPath + `/images/ysThree/sky/${skydir}/px.jpg`))
  const texture1 = new THREE.TextureLoader().load((gAppPath + `/images/ysThree/sky/${skydir}/nx.jpg`))
  const texture2 = new THREE.TextureLoader().load((gAppPath + `/images/ysThree/sky/${skydir}/py.jpg`))
  const texture3 = new THREE.TextureLoader().load((gAppPath + `/images/ysThree/sky/${skydir}/ny.jpg`))
  const texture4 = new THREE.TextureLoader().load((gAppPath + `/images/ysThree/sky/${skydir}/pz.jpg`))
  const texture5 = new THREE.TextureLoader().load((gAppPath + `/images/ysThree/sky/${skydir}/nz.jpg`))
  // 添加材質(zhì)
  const material = [
    new THREE.MeshBasicMaterial({color: 0xffddff, map: texture0, side: THREE.DoubleSide}),
    new THREE.MeshBasicMaterial({color: 0xffddff, map: texture1, side: THREE.DoubleSide}),
    new THREE.MeshBasicMaterial({color: 0xffddff, map: texture2, side: THREE.DoubleSide}),
    new THREE.MeshBasicMaterial({color: 0xffddff, map: texture3, side: THREE.DoubleSide}),
    new THREE.MeshBasicMaterial({color: 0xffddff, map: texture4, side: THREE.DoubleSide}),
    new THREE.MeshBasicMaterial({color: 0xffddff, map: texture5, side: THREE.DoubleSide})
  ]
  // 創(chuàng)建網(wǎng)格對(duì)象
  const cube = new _3d.Mesh(geometry, material)
  cube.layers.enableAll()
  cube.name = 'skybox'
  that.skybox && this.scene.remove(that.skybox)
  that.skybox = cube
  that.AmbientGroup.add(cube)
}

//移動(dòng)控制器
this.transformControls = new TransformControls(this.camera, this.renderer.domElement)
this.transformControls.setSize(0.5)
this.scene.add(this.transformControls) //添加入場(chǎng)景

transformControls.attach(...)
//對(duì)象類中
transform_attach(value){
  if (value) {
    this.transformControls.attach(this.dlight)
  }
  else {
    this.transformControls.detach(this.dlight)
  }
}

Viewer.prototype.bindTransformEvent = function () {

  this.transformControls.addEventListener('mouseDown', () => { //鼠標(biāo)拾取到
    var object = gapp.transformControls.object //獲取拾取對(duì)象
    this.objectPositionOnDown = object.position.clone()//保存位置
    this.objectRotationOnDown = object.rotation.clone()//保存角度
    this.objectScaleOnDown = object.scale.clone()//保存縮放大小
    gapp.controls.enabled = false
  })
  this.transformControls.addEventListener('mouseUp', () => {//鼠標(biāo)提起
    var object = gapp.transformControls.object//獲取拾取對(duì)象
    if (object !== undefined) {
      switch (gapp.transformControls.getMode()) { //這里判斷是要進(jìn)行平移、縮放、旋轉(zhuǎn)操作
        case 'translate':
          if (!this.objectPositionOnDown.equals(object.position)) {
            gapp.history.execute(new SetPositionCommand(this, object, object.position, this.objectPositionOnDown))
          }
          break
        case 'rotate':
          if (!this.objectRotationOnDown.equals(object.rotation)) {
            gapp.history.execute(new SetRotationCommand(this, object, object.rotation, this.objectRotationOnDown))
          }
          break
        case 'scale':
          if (!this.objectScaleOnDown.equals(object.scale)) {
            gapp.history.execute(new SetScaleCommand(this, object, object.scale, this.objectScaleOnDown))
          }
          break
      }
    }
    gapp.controls.enabled = true
  })
}

//轉(zhuǎn)化為threejs特有的json格式
 scene.toJSON() 
 （了解過(guò)json的同學(xué)可以發(fā)現(xiàn)，threejs為了縮小大小，將瓦片對(duì)象最大限度的拆分材質(zhì)等，通過(guò)id關(guān)聯(lián)并保存為json）
//解析json轉(zhuǎn)為對(duì)象
Viewer.prototype.fromJSON = function (json, layeridx, isRayobj) {
  return new Promise((resolve, reject) => {
    // 解析 json 對(duì)象
    let loader = new THREE.ObjectLoader();
    let loadedMesh = loader.parse(json);
    let scene = this.mergeToMaterialsMap(loadedMesh, true)
    resolve(scene)
  })
}