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How to add fog around a sphere ??

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unless you use some sort of localised fog thing, there is no way to make fog just around a sphere.

I think what you are after is a halo effect. Which is where the sphere appears to glow.

There are two ways. The quick way is to do a transperent sphere around the normal sphere. This will look ok. You could go one better and do several spheres.

The best way of acheving the halo effect, however, is to put a blended, textured quad through the middle of the sphere and aligned so it faces the camera always. Make the texture some sort of round sparkle that will look like it is radiating from the sphere.

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