James Buddenhagen wrote:

Some spline types need extra points before and after any calculated 
point. The reason you needed to overlap by two is that not only was the 
"tail" short, but the "head" didn't start until the second point.

I don't used sphere sweep, but I imagine that even though the ends are 
now touching, with certain spline types, the curve might still not be 
continuous without even more overlap. This is true with the POV-Ray 
natural_spline which IIRC might never be completely continuous at joined 
ends, but which gets *more* continuous with more overlap.

  -Shay

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