<Grid>

        <Viewport3D Name="myViewport" >

            <Viewport3D.Camera>

                <PerspectiveCamera Position="-2,2,2" LookDirection="2,-2,-2" />

            </Viewport3D.Camera>

            <ModelVisual3D>

                <ModelVisual3D.Content>

                    <DirectionalLight Color="White" Direction="-1,-1,-1"/>

                </ModelVisual3D.Content>

            </ModelVisual3D>

            <ModelVisual3D>

                <ModelVisual3D.Content>

                    <GeometryModel3D>

                        <GeometryModel3D.Geometry>

                            <MeshGeometry3D Positions="-1,0,0 0,1,0 1,0,0" TriangleIndices="0,2,1">

                            	<MeshGeometry3D.Normals>

                            		<Vector3D>7,0,7</Vector3D>

                            		<Vector3D>-2,1,0</Vector3D>

                            	</MeshGeometry3D.Normals>

                            </MeshGeometry3D>

                        </GeometryModel3D.Geometry>

                        <GeometryModel3D.Material>

                            <DiffuseMaterial Brush="Red"/>

                        </GeometryModel3D.Material>

                    <