Hi, I use normal OpenGL lighting to lit textured objects. Now I want to add a day/night sequence, simply by adjusting the lightsource diffuse/ambient color. Some of the textures have windows inside them. Is it possible to light the texture, except the window part? I can't use shaders, so I need to do it with OpenGL somehow. Maybe an alpha texture, where pixels tell the influence of the light, could help? How to implement that? Greetings, Rick