> Hello!
>
> I have got a problem about fog and I'm almost desperate because I don't find any
> solution.
> The problem is that the ground_fog object doesn't appear on my rendered images.
> The camera is not inside a solid object, so this should not be the problem.

Are you sure? Check the message pane after the render is completed. If 
you get a warning mentioning the camera and non-hollow object, then your 
camera is realy inside some object.

> I have got a few solid objects in the center, a sky_sphere object, a camera and
> a light source. Nothing special.

A sky_sphere is not an object at all, but a background feature. If your 
sky_sphere is realy an object instead of a background feature, then you 
need to add hollow to it.

> I also copied codes from fog-objects from similar codes that worked, but also
> that did not help.
> Maybe you have got an idea, what could be the problem.
> I would be very glad about that.
> Thank you in advance!
>
>

Do you use an actual sky_sphere, a very large sphere, or some sky_sphere 
generating macro?
The sky_sphere is a background feature and don't have any inside.
A very large sphere definetely have an inside, and everything in the 
scene is inside that sphere. You need to add hollow or inverse to that 
sphere.
A macro may actualy create a very large sphere. Enclose that macro into 
an object statement : object{SkySphereMacro() hollow}




Alain

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