Fog volume objects.

[Gumz]

Hi.
By accident I dropped a sphere into a fog volume, and what do you know, the fog volume took shape after the sphere. Great I thought and started modelling some simple clouds thinking I could dump them into the fog volume as well. It turned out that I couldn't. In fact, no other object then a sphere seem to work. Am I doing something wrong or is it working as intended?
/cheers

[aoktar]

I've intented to support all objects when i started to write this. But i've dropped to work on due complexity. Atm just spheres are supported.