Cesium鼠标移动到模型上，给模型添加高亮轮廓(四)

    //绑定鼠标移动到实体上时候的事件
    viewer.screenSpaceEventHandler.setInputAction(function onMouseMove( movement ) {   
      var pickedFeature = viewer.scene.pick(movement.endPosition);
      var selectedEntity = null;
      if(Cesium.defined(pickedFeature)){
        //如果指到primitive，因为其不能调整轮廓，所以当作空地处理
        //也可以用 pickedFeature instanceof Cesium.Cesium3DTileFeature 来判断，这样更好一些
        if(typeof(pickedFeature.id) == "undefined"){
          that.space=1;
          return;
        }
        selectedEntity = entityCollection.getById(pickedFeature.id.id);
        selectedEntity.model.silhouetteSize=2;
        if(that.selectedEntity==null){
          that.selectedEntity=selectedEntity;
          return;
        }
        //只是在同一模型内部动             
        if(selectedEntity._id === that.selectedEntity._id && that.space==0){
          return;
        }
        //从一个模型直接滑动到另一个模型
        else if(selectedEntity._id != that.selectedEntity._id)
        {
          selectedEntity.model.silhouetteSize=2;
          that.selectedEntity.model.silhouetteSize=0;
          that.selectedEntity=selectedEntity;
          that.space=0;
        }
        //经过空白
        else if(that.space==1){
          selectedEntity.model.silhouetteSize=2;
          that.space=0;
        }
        
      }
      //指到空地     
      else if(!Cesium.defined(pickedFeature) && that.selectedEntity!=null ){
        that.selectedEntity.model.silhouetteSize=0;
        that.space=1;
      }
    },Cesium.ScreenSpaceEventType.MOUSE_MOVE);