The volumetric materials will follow the shape if applied to something like a sphere. I used them in one picture that I did and stretched them out to loose the form of the sphere, that seemed to correct the problem of seeing lines. Sometimes we (artists) see stuff that other people wouldn't see because they don't know its there. We see the line because we know that we used, ie.. a sphere or box or whatever, and know where its at in the picture.

Hi Kristian1, If your running the patch(s) try selecting "sampling blur" from the shaders menu, the shader was designed to address this very situation. Hope it helps , if not , try disabling shadows. Hawkfyr

Like Deathbringer, I just increase the size until it passes outside the view of the camera. Though, for controlled fogbanks and the like, this will not work well. :/

you will see those in most images where you do spheres as a cloud, fire, or any other such thing. I have to admit, that this is ONE place that I touch up in images I do by just blurring the area with the blur tool in Photopaint or photoshop. I hate doing that...I like bryce to finish the image... anyhow, you can try the suggestions above, but I've 'been there done that' and it always seems to come back to post render touch up. later BT