Working on a spherical world a few miles in diameter. This one with the life on the inside of a hollow sphere. How would one make a fog like covering that would follow the inside curve but not the space towards the center of the sphere?

Hmm, good question. I'm thinking that you need a boolean set of spheres inside the one you have your world on. Use a volume on a large positive sphere that looks like fog. Make that sphere fit inside your world. Then a smaller negative sphere centered on the volume one and boolean those.

Ok, I tried it and the boolean does work, but I'm having a bit of a challenge making a material for the fog that works. Can't get the density high enough. Good luck, maybe someone has an idea?

Aye, it's a four-sphere/two group deal. On the fog Group, just make the negative sphere a little bit vertically (Y-axis) offset, and it should be fine... If you need a screenshot, let us know.

I use one of the volumetric clouds from the clouds presets.

It depends on if you are trying to make atmosphere (volume) or clouds (surface) with your fog. If you can't get the density high enough by cutting the transparency back, try raising the specularity so that it reflects more. Also checking or unchecking the blend transparency menu on the materials window changes the way your material renders.

Aye, pmoores, this is a tough one! I only spent about an hour on this, just to see how it worked, and it turned out horrible, never even let it finish rendering! Hopefully your piece comes out better...

shadowdragonlord, As a fog it's not so good, but a neat effect anyway. - TJ

Anything like this - i.e. the cloud following the curve? I've used a cylinder, but it works just the same with any shape. If you want a sphere, do the same as I did but position the camera and light sources inside the final object. I did it this way so you can see the outer object as well. My suggestion, then: Create your shape, make it positive. Copy it, reduce the copy, make it negative. Position copied shape in the centre of first shape and group. For the fog, copy the entire group and paste it, again in the centre, reduce its size and assign a volume material to it. That's it. The default mats are OK, but messing around a bit you can get a decent fog / cloud effect. This one took about 5 minutes (but I only used standard rendering) so you can way improve on it.

Tks for the info... went ahead with the rest and found plenty of other trouble to keep me busy. Was manually making landmasses and curving them along the inside of the sphere for mountians but the lack of a bend option for terrain really slowing me down. Ill take a look at your ideal once i get at least the land complete. The hollowed out sphere for the ground is purely a guide and to keep light out. I wanted the entire inside surface covered in water and landmasses bending up and off to the horizon. Just a few miles wide size vice solar system spanning.

hmmm all that messing around and it still has issues with only seeing a small arc of the full sphere unless you mess with lens settings. Maybe ill go with above and turn it into a cylinder ring world. That was spin covers the gravity fantasy ... maybe 3 light sources going into the distance.. i can do it... i know i can hahaha.... get groceries then i start.