<Window x:Class="AvalonApp.Window1"
    xmlns="http://schemas.microsoft.com/2003/xaml" xmlns:x="Definition"
    Text="AvalonApp"
    >
    <Viewport3D>
        <Viewport3D.Camera>
            <PerspectiveCamera Position="0,0,5" Up="0,1,0" LookAtPoint="0,0,0" FieldOfView="45">
                <PerspectiveCamera.Position>
                    <Point3DAnimation From="0,0,5" To="5,5,5" Duration="2" RepeatBehavior="Forever" AutoReverse="true"></Point3DAnimation>
                </PerspectiveCamera.Position>
            </PerspectiveCamera>
        </Viewport3D.Camera>
        <Viewport3D.Models>
            <AmbientLight Color="White"></AmbientLight>
            <GeometryModel3D>
                <GeometryModel3D.Material>
                    <BrushMaterial Brush="Blue"></BrushMaterial>
                </GeometryModel3D.Material>
                <GeometryModel3D.Geometry>
                    <MeshGeometry3D
                        Positions="-1,1,0 1,1,0 1,-1,0 -1,-1,0"
                        TriangleIndices="0 1 2 0 2 3">
                    </MeshGeometry3D>
                </GeometryModel3D.Geometry>
            </GeometryModel3D>
        </Viewport3D.Models>
    </Viewport3D>
</Window>