Hi Nick,

> So I have to import into Alibre and then export to
> .bip Alibre doesn't do obj format...

It depends on how Alibre generates the .bip but it's fairly likely that they'd export vertex normals in a similar way as MoI does to OBJ format, so probably the seam should not show up with that method either if they are generating the .bip in a good way.

Are you actually seeing the seam in KeyShot when use the MoI to Alibre to .bip to Keyshot method?


> BTW-I was actually thinking the sphere was created from a revolved arc.

Well, that's true too - the sphere is equivalent to a revolved arc. But a revolved arc will still create the kind of surface that I was describing, it will have a quadrilateral grid of control points with the top and bottom edge collapsed to a single point (that's where the arc would touch the revolve axis) and with the other 2 edges touching at the seam.

- Michael