private void DrawSphere() { // create a new point (MapPoint); pass x, y, and z coordinates in the constructor var point = new MapPoint(-122.4167, 37.7833, 6000); // create a graphics layer GraphicsLayer graphicsLayer = new GraphicsLayer(); graphicsLayer.ID = "Graphics Layer"; graphicsLayer.SceneProperties.SurfacePlacement = SurfacePlacement.Absolute; graphicsLayer.InitializeAsync(); // creates a red sphere with a radius of 20,000 meters var sphereSym = new SphereMarkerSymbol(); sphereSym.Color = Colors.Red; sphereSym.Radius = 20000; // create the graphic var graphic = new Graphic(point, sphereSym); graphicsLayer.Graphics.Add(graphic); // add the graphics layers to the scene this.sceneView.Scene.Layers.Add(graphicsLayer); }