public StaticPlanetObject(Vector3 position, float size, float rotSpeed = 0.003f)
            : base(position, size)
        {
            var rand = new Random();
            _model = ModelLoader.LoadModel<LightShaderParameters>("sphere.bin", "Planets/planet" + rand.Next(1,4));
            _model.InitStandardLights();

            _rotationDelta = new Vector3(rand.NextDouble(-rotSpeed, rotSpeed), rand.NextDouble(-rotSpeed, rotSpeed), rand.NextDouble(-rotSpeed, rotSpeed));
        }
        public StaticHiResObject(Vector3 position, String texture, float size, float rotSpeed, Vector3 rotationAxis)
            : base(position, size)
        {
            var rand = new Random();
            _model = ModelLoader.LoadModel<LightShaderParameters>("planet.bin", texture);
            _model.InitStandardLights();

            _rotationDelta = Matrix.CreateFromAxisAngle(rotationAxis, rotSpeed);
        }
        public OrbitingPlanetObject(Orbit orbit, float size)
            : base(orbit, size)
        {
            var rand = new Random();
            _model = ModelLoader.LoadModel<LightShaderParameters>("sphere.bin", "Planets/planet" + rand.Next(1,4));
            _model.InitStandardLights();

            _rotationDelta = new Vector3((float) (rand.NextDouble() * 0.06 - 0.03), (float) (rand.NextDouble() * 0.06 - 0.03), (float) (rand.NextDouble() * 0.06 - 0.03));
            _rotationDelta /= 10;
        }