Ah, I was very unspecific about the colours. Imagine a line, going out from your world-coordinate-zero-point to an imaginary skydome. The light will be placed on that line, let's say, 3000 Vue-Units away from the viewer. The light must have exactly the colour and luminosity of the point, where the line hits the skydome. I am no programmer and cannot express my thoughts in a programmer-like way, but thats what I tried to create with the "Lightdome". This way, a kind of global lightning is established. Along with weak lightsources inside objects and stronger-lightsources inside glowing objects, a good simulation with a minimal memory-footprint is possible. Trees pose a problem: Leaves are transparent to a certain degree and will give a greenish colour tint to the light underneath. I haven't found a way to correctly simulate this effect. Maybe you could use several spots, aligned with the sunlight, having a slightly greenish tint. On the other hand, simply changing the material of the leaves may be enough to do the job. Joerg