> I think the only way to get rid of the seam completely is to create a
> giant sphere with the light source in the middle, then put the scene
> objects on the bottom inner surface of the sphere. But that will create
> weird shadows and a lot of objects getting clipped by the sphere.

A sphere is the simple option, as it has a constant radius of curvature 
everywhere. There are other shapes though - the curves used on modern 
car body panels are very good examples of complex shapes with no visible 
seams.

clipka mentioned it already, you need a shape that not only has no 
abrupt changes in surface normal direction (eg using a cylinder to join 
two planes), but also no abrupt changes in the rate of change of surface 
normal. This is especially true if your shape is in anyway reflective 
(including specular highlights). You may even want to make sure the 2nd 
or 3rd derivative of surface normal direction has no jumps in it to 
ensure you are completely seam-free.

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