update model

src/modules/overlay/primitive/ModelPrimitive.js

     super()
     this._position = Parse.parsePosition(position)
     this._modelUrl = modelUrl
-    this._delegate = Cesium.Model.fromGltf({ url: modelUrl })
+    this._delegate = Cesium.Model.fromGltfAsync({ url: modelUrl })
     this._state = State.INITIALIZED
   }
 
     return Overlay.getOverlayType('model_primitive')
   }
 
-  get readyPromise() {
-    return this._delegate.readyPromise
-  }
-
   set position(position) {
     this._position = Parse.parsePosition(position)
     let origin = Transform.transformWGS84ToCartesian(this._position)
-    this._delegate.modelMatrix = Cesium.Transforms.headingPitchRollToFixedFrame(
-      origin,
-      new Cesium.HeadingPitchRoll(
-        Cesium.Math.toRadians(this._position.heading),
-        Cesium.Math.toRadians(this._position.pitch),
-        Cesium.Math.toRadians(this._position.roll)
+    this._delegate.then((model) => {
+      model.modelMatrix = Cesium.Transforms.headingPitchRollToFixedFrame(
+        origin,
+        new Cesium.HeadingPitchRoll(
+          Cesium.Math.toRadians(this._position.heading),
+          Cesium.Math.toRadians(this._position.pitch),
+          Cesium.Math.toRadians(this._position.roll)
+        )
       )
-    )
+    })
   }
 
   get position() {
 
   set modelUrl(modelUrl) {
     this._modelUrl = modelUrl
-    this._delegate = Cesium.Model.fromGltf({ url: modelUrl })
+    this._delegate = Cesium.Model.fromGltfAsync({
+      url: modelUrl,
+      ...this._style,
+    })
     this.position = this._position
   }
 
     this.position = this._position
   }
 
-  /**
-   *
-   * @param name
-   */
-  getMaterial(name) {
-    return this._delegate.getMaterial(name)
-  }
-
-  /**
-   *
-   * @param name
-   */
-  getMesh(name) {
-    return this._delegate.getMesh(name)
-  }
-
-  /**
-   *
-   * @param name
-   * @returns {*}
-   */
-  getNode(name) {
-    return this._delegate.getNode(name)
-  }
-
-  /**
-   *
-   * @returns {*}
-   */
-  getNodes() {
-    return this._delegate._runtime.nodes
-  }
-
   /**
    * Sets style
    * @param style
       return this
     }
     Util.merge(this._style, style)
-    Util.merge(this._delegate, style)
+    this._delegate.then((model) => {
+      Util.merge(model, style)
+    })
     return this
   }
 }

src/modules/viewer/Viewer.js

     return this._delegate.scene.globe._surface._debug.maxDepthVisited
   }
 
-
   /**
    * Adds a plugin
    * @param plugin
     link.click()
     return this
   }
-
 }
 
 export default Viewer