public ShellViewModel() { this.Title = "MvvmCameraDemo"; this.Viewport1 = new ViewportViewModel(); this.Viewport2 = new ViewportViewModel(); var camera = new PerspectiveCamera() { Position = new Point3D(0, -10, 0), LookDirection = new Vector3D(0, 10, 0), UpDirection = new Vector3D(0, 0, 1), FieldOfView = 60, }; this.Viewport1.Camera = camera; this.Viewport2.Camera = camera; }