private SpaceModel<SpaceObject> MakeBurningPlanet()
        {
            var spaceModel = new SpaceModel<SpaceObject>();

            var planet = new StaticHiResObject(Vector3.Backward * 150, "Planets/PlanetBurning", 4.0f, 0.0003f, Vector3.Up);
            var star = new StarObject(Vector3.Zero, 120, 0.001f, 0.3f, 0.98f, 0.1f);
            spaceModel.AddSpaceObject(planet);
            spaceModel.AddSpaceObject(star);

            return spaceModel;
        }
        private SpaceModel<SpaceObject> MakeSunset()
        {
            var spaceModel = new SpaceModel<SpaceObject>();

            var planet = new StaticHiResObject(Vector3.Left * 9 + Vector3.Down * 4, "Planets/EarthNight", 8.0f, 0.0003f, Vector3.Up);
            var star = new StarObject(Vector3.Forward * 20 + Vector3.Right * -5.5f + Vector3.Up * 3, 2, 0.001f, 0.9f,0.92f, 0.2f);
            spaceModel.AddSpaceObject(planet);
            spaceModel.AddSpaceObject(star);

            return spaceModel;
        }