[Action Script] 3D drawing - circle on a sphere June,2012

Hiya,

I was wondering if anyone could point me in the right direction. I'm looking for a way to draw a circle on 3D sphere.

I have a 3D sphere of the world, on it there's a few cities. What I want is to have these cities each have a circle covering the surrounding area on the 3D earth.

I'm using Away3D 4.0, but as this is more of a math issue rather than an engine issue it might not be too relevant. As for my math skills, they used to be really good, but haven't used my 3D maths in a few years. So you might have to bare with me.

Thanks
3D drawing - circle on a sphere

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