public static IGroup Build()
        {
            var root = Group.Create();

            var model = CreateDragonModel();

            var geometryFactory = GeometryFactory.Create();

            var cube = geometryFactory.CreateCube(VertexType.Position3Texture2Color3Normal3,
                                                  TopologyType.IndexedTriangleList);

            // Shape Drawables
            var cubeShape = Box.Create(Vector3.Zero, 0.5f * Vector3.One);
            var hints     = TessellationHints.Create();

            hints.NormalsType = NormalsType.PerVertex;
            hints.ColorsType  = ColorsType.ColorPerVertex;

            var freq       = (float)(2 * System.Math.PI / 9);
            var cubeColors = MakeColorGradient(freq, freq, freq, 0, 2, 4, 8);

            var cubeDrawable =
                ShapeDrawable <Position3Texture2Color3Normal3> .Create(
                    cubeShape,
                    hints,
                    cubeColors.ToArray());

            var cube2 = Geode.Create();

            cube2.AddDrawable(cubeDrawable);

            var sphereShape = Sphere.Create(Vector3.Zero, 0.5f);
            var sphereHints = TessellationHints.Create();

            sphereHints.SetDetailRatio(1.6f);

            var sphereDrawable =
                ShapeDrawable <Position3Texture2Color3Normal3> .Create(
                    sphereShape,
                    sphereHints,
                    new Vector3[] { new Vector3(1.0f, 0.0f, 0.0f) });

            var sphere = Geode.Create();

            sphere.AddDrawable(sphereDrawable);

            var cubeXForm = MatrixTransform.Create(Matrix4x4.CreateScale(10f, 10f, 10f));

            cubeXForm.AddChild(sphere);

            var cubeXForm2 = MatrixTransform.Create(Matrix4x4.CreateScale(10f, 10f, 10f));

            cubeXForm2.AddChild(cube2);

            var leftTop  = MatrixTransform.Create(Matrix4x4.CreateTranslation(-10f, 10f, 0f));
            var rightTop = MatrixTransform.Create(Matrix4x4.CreateTranslation(10f, 10f, 0f));

            var leftBottom  = MatrixTransform.Create(Matrix4x4.CreateTranslation(-10f, -10f, 0f));
            var rightBottom = MatrixTransform.Create(Matrix4x4.CreateTranslation(10f, -10f, 0f));

            leftTop.AddChild(model);
            rightTop.AddChild(model);

            leftBottom.AddChild(cubeXForm);
            rightBottom.AddChild(cubeXForm2);

            var flatYellowMaterial = PhongMaterial.Create(
                PhongMaterialParameters.Create(
                    new Vector3(1.0f, 1.0f, 0.0f),
                    new Vector3(1.0f, 1.0f, 0.0f),
                    new Vector3(1.0f, 1.0f, 1.0f),
                    20),
                PhongPositionalLight.Create(new Vector4(0, 100, 0, 1), PhongLightParameters.Create(
                                                new Vector3(0.2f, 0.2f, 0.2f),
                                                new Vector3(0.2f, 0.2f, 0.2f),
                                                new Vector3(1.0f, 1.0f, 1.0f),
                                                300f,
                                                1)));

            var shinyRedGoldMaterial = PhongMaterial.Create(
                PhongMaterialParameters.Create(
                    new Vector3(1.0f, 1.0f, 0.0f),
                    new Vector3(1.0f, 1.0f, 0.0f),
                    new Vector3(1.0f, 1.0f, 1.0f),
                    5),
                PhongHeadlight.Create(PhongLightParameters.Create(
                                          new Vector3(0.1f, 0.1f, 0.1f),
                                          new Vector3(1.0f, 1.0f, 1.0f),
                                          new Vector3(1.0f, 1.0f, 1.0f),
                                          30f,
                                          1)),
                false);

            var cubeMaterial = PhongMaterial.Create(
                PhongMaterialParameters.Create(
                    new Vector3(1.0f, 1.0f, 1.0f),
                    new Vector3(1.0f, 1.0f, 1.0f),
                    new Vector3(1.0f, 1.0f, 1.0f),
                    50f),
                PhongHeadlight.Create(PhongLightParameters.Create(
                                          new Vector3(0.5f, 0.5f, 0.5f),
                                          new Vector3(1.0f, 1.0f, 1.0f),
                                          new Vector3(1.0f, 1.0f, 1.0f),
                                          1f,
                                          0)),
                false);

            var sphereMaterial = PhongMaterial.Create(
                PhongMaterialParameters.Create(
                    new Vector3(0.0f, 0.0f, 1.0f),
                    new Vector3(0.0f, 0.0f, 1.0f),
                    new Vector3(1.0f, 1.0f, 1.0f),
                    5f),
                PhongPositionalLight.Create(new Vector4(0, 10, 0, 1), PhongLightParameters.Create(
                                                new Vector3(0.1f, 0.1f, 0.1f),
                                                new Vector3(1.0f, 1.0f, 1.0f),
                                                new Vector3(1.0f, 1.0f, 1.0f),
                                                10000f,
                                                2)),
                true);

            leftTop.PipelineState  = flatYellowMaterial.CreatePipelineState();
            rightTop.PipelineState = shinyRedGoldMaterial.CreatePipelineState();
            sphere.PipelineState   = sphereMaterial.CreatePipelineState();
            cube2.PipelineState    = cubeMaterial.CreatePipelineState();
//            rightTop.PipelineState = CreateHeadlightState(
//                new Vector3(1.0f, 1.0f, 0.0f),
//                50,
//                Vector3.One,
//                5);

            var sceneGroup = Group.Create();

            sceneGroup.AddChild(leftTop);
            sceneGroup.AddChild(rightTop);
            sceneGroup.AddChild(leftBottom);
            sceneGroup.AddChild(rightBottom);

            root.AddChild(sceneGroup);

            return(root);
        }