Why doesn't emmisive material render in my camera? I'm trying to create a simple sky for a scene.  Right now I'm modelling it as a gradient texture applied to the inside of a sphere.  I made the shader emissive so that it does not cast a shadow and contributes ambient light to the scene.  

Unfortunately, it does not show up when seen through the camera or in the final render.  How do I get my emissive shader to be seen?
First thing that comes to mind is that it might be camera clipping (basically that your 'render distance' is too short).