environment fog keeps rendering black

[X14Halo]

So I watched some digital tutors tutorials on the environment fog for maya 2011, and I have a basic understanding of how it should work. I just plugged the EnvironmentFog shader directly in the environment volume in the render globals. Problem is, is keeps rendering black no matter what I do. I have a huge scene, and I set the fog height pretty high so that it will cover my scene. I tried setting the fog distance to something like 9999999 so that it should be pretty transparent, and i set the fog density to .1 with no luck. Plus, I raised the fog emission color a little bit but it still renders completely black. Any ideas what I am doing wrong?

[Zdravko]

Maybe you set the Fog height pretty high.
Try to lower the Fog height value until you start getting any result different than black.

[vlado]

Like Zdravko said, it might be that the fog is too dense and simply blocks all light.

Best regards,
Vlado