Thanks lots! Um I don't wanna be a pain but you know what would be REAL cool? A similar func like FogColor() and AmbientColor() but one that approximates the current color in the "top pole of the sky hemisphere". Would be useful for various things! I know (well presume) the calculation is hidden somewhere in the atmo shader.. might be tricky to extract from shader-side to script-side (unless it's already there) but if it's not too much trouble, it would be VASTLY better than having to do a texture read-back from screen (or rendertex) down to the CPU side..