         let options = CesiumOptions(
             clock: Clock(clockStep: .SystemClock, isUTC: false),
             imageryProvider: nil,
-            terrain: true,
+            terrain: false,
             skyBox: true,
             scene3DOnly: false
         )
 
         _globe = CesiumGlobe(view: _view, options: options)
-        _globe.scene.imageryLayers.addImageryProvider(BingMapsImageryProvider())
-        //_globe.scene.imageryLayers.addImageryProvider(TileCoordinateImageryProvider())
+        //_globe.scene.imageryLayers.addImageryProvider(BingMapsImageryProvider())
+        _globe.scene.imageryLayers.addImageryProvider(TileCoordinateImageryProvider())
         
         _globe.scene.camera.constrainedAxis = Cartesian3.unitZ
         

    
    private let _view: MTKView
    
    init (view: MTKView) {
        
        _view = view

    }
    
    func mtkView(view: MTKView, drawableSizeWillChange size: CGSize) {
        _viewportOverlay.rectangle = BoundingRectangle(x: 20, y: 20, width: Double(size.width)/2-40, height: Double(size.height)/2-40)
        /*let scale = self.v!.backingScaleFactor
         let layerSize = view.bounds.size
         
