I don't remember, so don't hold me to it, but just 'cause you may be anxious about it, I'll give it a go:
It LOOKS like the settings for the sky model is simplified or whatever. Basically, when you're in the game, hold SHIFT and press ESC. That should bring up the control panel. I THINK somewhere around there are settings for the sky model, or they're in the options menus somewhere. If that doesn't work, I don't know what would, except to say that if your computer can handle the upgrade packs, that might help too.
I can't replicate the issue no matter what options I set... what model is your nVidia or ATi videocard (If it's not an ATi or an nVidia, that's probably the problem) and what driver version?
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It LOOKS like the settings for the sky model is simplified or whatever. Basically, when you're in the game, hold SHIFT and press ESC. That should bring up the control panel. I THINK somewhere around there are settings for the sky model, or they're in the options menus somewhere. If that doesn't work, I don't know what would, except to say that if your computer can handle the upgrade packs, that might help too.