public void Save(TextWriter writer)
{
var kvp = new KeyValuePairs();
kvp.SetColour("background_colour", BackgroundColour);
kvp.Set("background_image", BackgroundImage);
kvp.SetColour("ambient_colour", AmbientColour);
kvp.SetColour("light_colour", LightColour);
kvp.SetVector("light_direction", LightDirection);
kvp.SetColour("light2_colour", Light2Colour);
kvp.SetVector("light2_direction", Light2Direction);
kvp.Set("model", ModelPath);
kvp.Set("foreground_model", ModelPath);
kvp.Set("animation", AnimPath);
kvp.Set("render_pass", RenderPass);
kvp.Set("foreground_render_pass", ForegroundRenderPass);
kvp.Set("cast_shaows", CastShadows);
kvp.Save(writer);
}